Astrophysics seminar

Tähtitieteen seminaari / Astrophysics seminar

The seminar programme is organised by Till Sawala. If you would like to propose a speaker, please email: till.sawala@helsinki.fi

The seminar usually takes place on Fridays from 10:15 - 11:15, in A 315 (HIP seminar room), Physicum, Kumpula Campus, and remotely via zoom at the following link:
 

Next Seminar:  17.1. 10:15, Wang Song (Beijing National Astronomical Observatories): "Searching for Compact Objects Using LAMOST and Gaia"

https://helsinki.zoom.us/j/65334904610?pwd=S2ZqYVpvQXVuTGNhVlJTbVczZlBwdz09

Please check this website for updates or different starting times!
 

Program Spring 2025

• 17.1. Wang Song (Beijing National Astronomical Observatories): "Searching for Compact Objects Using LAMOST and Gaia"
• 24.1.
• 31.1.
• 7.2.
• 14.2.
• 21.2.
• 28.2.
• 7.3.  (teaching break)
• 14.3.
• 21.3.
• 28.3.
• 4.4.
• 11.4.
• 18.4. (Easter break)
• 25.4.

Past program Autumn 2024

• 3.9. Yasin Qasi (Newcastle University): "Nonlinear States of the Magnetic Buoyancy Instability"
• 27.9. Balint Seli (Konkoly Observatory, Hungary): "Stellar flare shapes with TESS
• 4.10. Vadim Kravtsov (University of Turku): "Probing the physics of black hole and neutron star X-ray binaries with polarimetry"
• 11.10. Mikael Granvik (University of Helsinki): "Understanding the population of near-Earth objects through physico-dynamical models and telescopic surveys"
• 17.10. Timothy Heaton (University of Leeds): "Radiocarbon Dating: The essential clock to measure the past"
• 08.11. Jens Jasche (University of Stockholm):  "Tracing Cosmic Origins: Towards a Digital Twin of the Universe"
• 15.11. Enrico Congiu (ESO): "The MUSE view of the Sculptor"
• 22.11. Mika Juvela (University of Helsinki): "Radiative transfer modelling of Taurus and Orion clouds"
• 13.12. Olavi Kiuru (University of Helsinki): "Compton scattering in ultra-strong magnetic fields"

Past program Spring 2024

• 19.1. Joonas Nättilä (Flatiron Institute/Columbia University): "Neutron Star Weather Forecasting"
• 26.1. Núria Miret-Roig (University of Vienna): "Synchronising stellar clocks. A new observable for probing star formation and dispersion"
• 9.2.  Sarah Bird (China Three Gorges University): "Milky Way Mass with K Giants and BHB Stars Using LAMOST, SDSS/SEGUE, and Gaia"
• 16.2. Eric McLennan (University of Helsinki): "Thermal Processes on near-Sun Asteroids: Observations and Models"
• 23.2. Guilhem Lavaux (Institut d'Astrophysique de Paris): "Machine learning boosted cosmological inference"
• 1.3.  Raffaele Gratton (INAF): "How frequent is the Solar System?"
• 22.3. Emma Thomas (University of Leicester): "Into the Unknown: Observing infrared aurorae of Uranus"
• 5.4.  Till Sawala (University of Helsinki): "Revealing the Galactic potential with expanding star clusters"
• 10.4. Jenny Wagner (BASIC): "Lensing of '69 -- Free gravitational lensing from its heuristic models"
• 26.4. Job Vorster (University of Helsinki): "VLBI Water Maser Monitoring During the Onset of the Accretion Burst in NGC6334I"
• 3.5.   David Benisty (University of Cambridge): "Constraining Dark Energy from the Local Universe"
• 17.5. Jehanne Delhomelle (University of Helsinki / Toulouse): "The future of the Local Group"
• 17.6.  Antti Rantala (MPA Garching): "Hierarchical star cluster assembly boosts massive black hole seed formation"
• 26.7.  Radhika Chirakkara (The Australian National University): "Magnetic field in galaxy clusters (with Hybrid particle-in-cell simulations)" 
   

Past program Autumn 2023

• 8.9. Till Sawala (Helsinki): "The Timeless Timing Argument"
• 15.9. Elisabeta Lusso (Florence): "What we can (still) learn from the non-linear X-ray to UV relation in AGN"
• 22.9. Karri Muinonen (Helsinki): "Scattering of light by cosmic dust particles using parameterization"
• 29.9. Antti Penttilä (Helsinki): "Modeling the polarimetric observations of the Didymos asteroid"
• 4.10. Sandrine Lescaudron (Institud d'Astrophysique de Paris): "Dynamical friction of a massive black hole in a turbulent gaseous medium"
• 6.10. Alex Rawlings (Helsinki): "Uncertainty in SMBH binary eccentricity is unavoidable"
• 13.10. Katja Fahrion (ESA): "Nuclear star cluster formation in massive and dwarf galaxies"
• 27.10. Maria Stone (Turku): "Observational view of galaxies in Type I quasar fields at redshifts 0.1<z<0.5 and its implications to AGN triggering and galaxy evolution"
• 3.11. Haonan Zheng (Durham): "Dark Matter Mini-halo Abundance and Annihilation Signals Under Baryonic Impacts"
• 10.11. Federico di Vruno (SKA Observatory): "Dark and Quiet Skies and satellite constellation interference" slides available
• 15.11. Bingqing Sun (Massachusetts Amherst): "The role of spiral arms in Galaxies"
• 24.11. Christopher Tiede (Copenhagen): "Orbital evolution and observational signatures of massive binaries accreting from circumbinary disks"
• 1.12. Jessica Hislop (Helsinki): "How clustered stellar feedback drives galactic scale outflows"
• 5.12  Tomáš Šoltinský (Tata Institute of Fundamental Research): "Prospects of statistical detection of the 21-cm forest by the uGMRT"
• 8.12. Elina Lindfors (Turku): "The Mystery of Cosmic Neutrinos"
• 15.12. Maarit Korpi-Lagg (Aalto) : "Dynamo instabilities in stellar convection zones: implications for dynamics and dynamos"

Past program Spring 2023

• 13.1. Axel Runnholm (University of Stockholm): "Probing the Epoch of Reionization with Lya - laying the foundations at low redshift "
• 17.1. Jan Kára (Charles University Prague): "Doppler tomography of the cataclysmic variable IX Velorum"
• 20.1. Christopher Berry (University of Glasgow): "Understanding the evolution of binary black holes"
• 3.2. Mireia Montes (Instituto de Astrofísica de Canarias): "How the intracluster light is going to change your life!"
• 10.2. Stefano Andreon (INAF-OA Brera): "The inside-out growth of galaxy clusters: reaching the virial radius in Abell 2244"
• 17.2. Till Sawala (University of Helsinki): "Distinct distributions of elliptical and disk galaxies as a ΛCDM prediction"
• 24.2. Sohan Ghodla (University of Auckland): "Influence of accretion on stellar and compact remnant evolution"
• 3.3. Richard Brooks (University College London): "ΛCDM survives another day: Origins of the asymmetry in the ALFALFA survey"
• 17.3. Johanna Hartke (University of Turku): "Tracing halo and intra-cluster light assembly with planetary nebulae"
• 24.3. Bibiana Prinoth (Lund Observatory): "Exploring the atmosphere of the ultra-hot Jupiter WASP-189 b"
• 31.3. Alberto. J. Castro-Tirado (Institute of Astrophysics of Andalucía): "The Burst Observer and Optical Transient Exploring System in the Multi-Messenger Astronomy Era"
• 14.4. Mika Juvela (University of Helsinki): "Structure of star-forming clouds: methods and measurements"
• 21.4. Thomas Hackman (University of Helsinki): "Magnetic fields on solar-type stars"
• 28.4. Dipto Mukherjee (Carnegie Mellon University): "Exploring the Dynamics of Massive Black Hole Mergers in Relaxed Nuclear Star Clusters"
• 5.5.  John Regan (Maynooth University): "Black Hole Formation Pathways and Observational Signatures"
• 15.5 Thorsten Naab (MPA Garching): "Towards a complete model of the star forming interstellar medium"
• 16.6. Arif Babul  (University of Victoria): "Modeling the Formation and Evolution of Massive Galaxies in the Cosmos: Successes & Opportunities"

Past program Autumn 2022

• 9.9. Ruby Wright (ICRAR & Flatiron Institute), "An orbital perspective on the starvation, stripping, and quenching of satellite galaxies in cosmological simulations"
• 16.9. Till Sawala (University of Helsinki), "The Local Group's mass: probably not more than the sum of its parts"
• 7.10. Shourya Khanna (INAF Torino), "Galactic dynamics with Gaia DR3: A new resonance-like feature in the outer disc of the Milky Way"
• 14.10. Franco Vazza (University of Bologna), "The simulated and observed  magnetism of  the cosmic web"
• 20.10. Simon Portegies Zwart (Leiden University), "The unpredictability of relativistic stellar clusters and the paradox of infinitesimal granularity"
• 4.11. Benne Holwerda (University of Louisville), "Looking At the Distant Universe with the MeerKAT Array LADUMA"
• 11.11. Petra Nianqi Tang (University of Auckland), "Predicting gravitational wave signals from galactic binary populations of a Milky Way-like galaxy for LISA"
• 18.11. Mikko Pöntinen (University of Helsinki), "Detecting asteroids with convolutional and recurrent neural networks"
• 25.11. Joanna Drazkowska (MPI for Solar System Research), "Rewriting the planet formation theory"
• 2.12. John Wu (Space Telescope Science Institute), "Astronomy Re-envisioned: Investigating the Physics of Galaxy Evolution with Machine Learning"
• 9.12. Event in celebration of Juhani Huovelin (15:00)
• 16.12. Tero Hiekkalinna (University of Helsinki / THL), "Light from the Darkness - Deep Space Astrophotography"

Past program Spring 2022

• 14.1. Job Vorster (North West University), "Accretion bursts: a global observational effort in massive star formation studies"
• 21.1. Till Sawala (University of Helsinki), "The Plane of Milky Way satellites - the end of ΛCDM?"
• 28.1. Francesco Rizzuto (University of Helsinki), "Collisions in compact star clusters and formation of massive Black Holes"
• 4.2. Laura Sberna (Albert Einstein Institute), "The calm after the storm: black hole ringdown beyond linear perturbation theory"
• 11.2. Tuomas Kangas (Stockholm), "The structure of the SN 1987A remnant"
• 18.2. Pascale Jablonka (EPFL Lausanne), "Looking for and into the galaxy building blocks"
• 25.2. Alejandro Benitez-Llambay (University of Milano-Bicocca), "Dark and late-forming galaxies: probing ΛCDM at the edge of galaxy formation"
• 4.3. Sambatra Andrianomena (University of Cape Town), "Leveraging Machine Learning and Simulation in preparation for the era of big data in Astronomy"
• 25.3. Sanna Damsted (University of Helsinki), "Role of substructure in galaxy cluster scaling relations"
• 1.4. Mika Juvela (University of Helsinki), "Simulations and synthetic interferometry observations of a high-mass star forming cloud"
• 8.4. Antti Penttilä (University of Helsinki) "Blender/Python testbed for asteroid imaging and camera performance simulations"
• 22.4. Leo Burtscher (University of Leiden), "Astronomy and the climate crisis"
• 29.4. Miikka Väisälä (Academica Sinica, Taiwan), "Pseudodisks in Star Formation"
• 13.5. Special seminar with Auni Somero (aeromon.fi) and Pauli Pihajoki, "Life and work beyond academia"

Past program Autumn 2021

• 17.9. Dimitrios Irodotou (University of Helsinki), "The effects of AGN feedback on the structural and dynamical properties of Milky Way-mass galaxies in cosmological simulations"
• 24.9. Aku Venhola (University of Oulu), "Low mass galaxies and their evolution in dense galactic environments - the Fornax cluster as a case study"
• 1.10. Jessica Hislop (Max Planck Institute for Astrophysics), "The challenge of simulating the star cluster population of dwarf galaxies with resolved interstellar medium"
• 8.10. Stephen Marsden (University of Southern Queensland), "The shared evolution of stars and planets"
• 15.10. Anne Virkki (University of Helsinki), "Characterizing Near-Earth Asteroids using the Arecibo Radar Observations"
• 22.10. Teemu Willamo (University of Helsinki), "Magnetic imaging of young solar analogues"
• 29.10. Achamveedu Gopakumar (Tata Institute of Fundamental Research, Mumbai):  "Modeling gravitational wave signals from non-circular compact binaries"
• 5.11. Ioana Ciuca (University College London): "Unveiling missing hidden atomic physics using generative machine learning models" slides available to download here
• 12.11. Jyri Lehtinen (University of Helsinki): "Stellar magnetism across rotation and the HR-diagram"
• 19.11. Johan Fynbo (Niels Bohr Institute, University of Copenhagen) "Astrometric selection of Quasars"
• 26.11. Nikki Arendse (DARK, University of Copenhagen), "Cosmic dissonance: new physics or systematics behind the Hubble tension?"
• 3.12. Josh Borrow (MIT), "How to Simulate a Universe: The numerics and limitations of Cosmological Simulations"

Past Program Spring 2021

• 15.1 Sandra P. Treviño-Morales (Chalmers University of Technology, Sweden) at 11.15: Dynamics and fragmentation in Galactic filamentary structures
• 29.1 Toni Tuominen (University of Tartu, Estonia): An EAGLE view of the missing baryons
•   5.2 Akke Viitanen (University of Helsinki): Untangling X-ray AGN clustering through observations and semi-empirical models
• 12.2 Dimitrios Irodotou (University of Sussex, UK): Analysing the morphology of simulated galaxies and the effect of AGN feedback
• 19.2 Eric MacLennan (University of Helsinki): The Thermal and Dynamical History of (3200) Phaethon and (155140) 2005 UD
• 19.3 Mikko Tuomi (University of Helsinki): Planets orbiting M dwarfs in the Solar neighbourhood - The spectacular abundance of small planets orbiting M dwarfs based on radial velocity surveys
• 16.4 Emma Mannfors (University of Helsinki): Characterization of dense Planck clumps observed with Herschel and SCUBA-2
• 23.4 Thomas Pasini (Hamburg University): Radio galaxies in galaxy groups: kinematics, scaling relations and AGN feedback
• 30.4 Johannes Markkanen (Max Planck Institute, Germany): Scattering, absorption and thermal emission by dust: Application to the comet 67P/Churyumov-Gerasimenko
•   7.5 Karri Muinonen (University of Helsinki): Coherent backscattering by airless Solar System objects using Mueller matrix decomposition
• 21.5 David Korda (University of Helsinki): Helioseismic inversions for plasma flows

Past Program Fall 2020

• 18.9 Shihong Liao (University of Helsinki): The story of ultra-diffuse galaxies in the Auriga simulations
• 23.10 Mika Juvela: Modelling of Interstellar Medium
• 29.10 Neil Cornish (Montana State University): On the road to low frequency gravitational wave detection: NANOGrav at mile marker 12.5
• 30.10 Antti Penttilä: Asteroid taxonomy using neural networks
•   6.11 Joonas Uusitalo: Astronomical and terrestrial anomalies in natural archives
• 13.11 Heidi Lietzen (Tartu Observatory): Groups of galaxies as the evolving building blocks of the Universe
• 20.11 Charlie Mpetha (Liverpool University): Gravitational Redshifting of Galaxies in the SPIDERS Cluster Catalogue
• 27.11 John Regan (Maynooth University, Ireland): Pathways to Forming Massive Black Holes in the Early Universe
•   4.12 Stefano Andreon (Brera Observatory): Gas-poor clusters: what kind of beasts are they?
• 11.12 Julia Martikainen (University of Helsinki) at 11:00: Asteroid phase curve parameters and absolute magnitudes from Gaia photometry

Past Program Spring 2020

• 10.1     Ulrich Steinwandel (LMU Munich): Resolving ISM-physics in galactic scale simulations
• 17.1     Athanasia Toliou (Luleå University of Technology): Dynamical evolution of the Main Asteroid Belt in the primordial Solar System
• 31.1     Stuart McAlpine (University of Helsinki): Galaxy mergers in EAGLE do not induce a significant amount of black hole growth yet do increase the rate of luminous AGN
•   7.2     Till Sawala (University of Helsinki): Setting the Stage: Structure formation from Gaussian Random Fields
• 21.2     Joonas Herranen (University of Helsinki): Too plausible to be true? Centrifugal explosions of cometary dust by sunlight VS a zoo of observations
• 28.2     Eric MacLennan (University of Helsinki): Deciphering Space Weathering on Asteroids using Meteorite Analogs
• 13.3     Natalia Lahen (University of Helsinki): Simulating the formation of star clusters in a dwarf galaxy starburst resolved with individual massive stars
• 20.3     Neha Sharma (Kyung-Her University): Triggered star formation in molecular clouds
• 3.4       Tomas Kohout (University of Helsinki): Spectral Shock Darkening During Asteroid Collisions
• 15.5     Timo Väisänen (University of Helsinki): Light scattering in dense particulate media

Past Program Fall 2019

• 9.8.     Habib Khosroshahi (IPM/INO): Galaxies and central engine; the role of group environment and dynamics
• 30.8.   Hamid Mehdipour (Lahijan University): Cluster analysis of the solar system objects
• 6.9.     Lauri Haikala (Universidad de Atacama): A mysterious dusty object in the Sa galaxy NGC3269
• 13.9.   Antti Rantala (University of Helsinki): Galactic-scale N-body simulations with resolved small-scale gravitational dynamics: recent progress and future challenges
• 20.9.   Matias Mannerkoski (University of Helsinki): Gravitational Waves from the Inspiral of Supermassive Black Holes in Galactic-scale Simulations
• 27.9.   Peter Roelfsema (SRON): SPICA - a joint infrared space observatory
• 4.10.   Peter Johansson (University of Helsinki): Post-Newtonian dynamical modelling of super-massive black holes in global large-scale simulations
• 11.10. Karri Muinonen (University of Helsinki): Asteroid lightcurve inversion using Bayesian inference
• 18.10. Teemu Willamo (University of Helsinki): Shapes of stellar activity cycles
• 1.11.   Moses Mogotsi (South African Astronomical Observatory): Multi-wavelength Feedback studies in the Nearby Universe, featuring IRAS18293-3413 and friends
• 8.11.   Alex Ho (University of Agder): The Extended N-Body Problem
• 15.11. Matthew Holman (Harvard-Smithsonian Center for Astrophysics): A Pan-STARRS and TESS Search for Distant Planets
• 22.11. Alberto Cellino (INAF Osservatorio Astrofisico di Torino): Asteroid Polarimetry: State of the art and Recent Achievements
• 29.11. Alexis Finoguenov (University of Helsinki): Largest spectroscopic catalog of X-ray galaxy clusters from SDSS-IV
• 13.12. Evgenij Zubko (Kyung Hee University): Polarimetry of two near-Earth comets of 2018: Fast variations of polarization in the 21P/Giacobini-Zinner coma and low P_max in C/2018 V1 (Machholz–Fujikawa–Iwamoto)
• 19.12.  Anne Virkki (Arecibo Observatory): Arecibo Observatory planetary radar program

Past Program Spring 2019

• 22.1. Johan Comparat (MPE): Cosmology with eROSITA's active galactic nuclei
• 25.1. Jacob Ider Chitham (MPE): Optical follow-up of CODEX galaxy clusters with SPIDERS and Pan-STARRS
• 1.2.   Ghassem Gozaliasl (University of Helsinki): BGG science in deep surveys vs. simulations
• 8.2.   Hannu Kurki-Suonio (University of Helsinki): Euclid Cosmology Mission
• 15.2. Florian Käfer (MPE): Towards a characterization of X-ray galaxy clusters for cosmology
• 21.2. Miikka Väisälä (TIARA/ASIAA, Taiwan): Observational Signatures of Misaligned Magnetic Fields in Early Disk Formation and Their Time Evolution
• 25.2. Oleksiy Golubov (V. N. Karazin Kharkiv National University and University of Colorado Boulder): Light pressure forces on asteroids and YORP equilibria
• 1.3.   Clotilde Laigle (University of Oxford): Observing the multi-scale cosmic web at high redshift and quantifying its impact on galaxy assembly
• 15.3. Oliver Müller (University of Strasbourg): Testing cosmological models with dwarf galaxies
• 22.3. Roberto De Propris (University of Turku): The Ultraviolet Upturn in Elliptical Galaxies
• 29.3. Guanglang Xu (University of Helsinki): A quick introduction to spherical wavelets and two relevant applications
• 5.4.   John Regan (Dublin City University): Black Hole Formation in the Early Universe
• 10.4  Lankeswar Dey (University of Turku): The Nascent Field of Nanohertz Gravitational Wave Astronomy
• 12.4. Julia Martikainen (University of Helsinki): Asteroid surface composition by modelling light scattering
• 26.4. Grigori Fedorets (University of Helsinki): Discovering minimoons with LSST
• 3.5.   Yirui Zheng (University of St. Andrews): Comparison of stellar populations of simulated and real post-starburst galaxies in ManNGA
• 6.5    Richard Ellis (University College London): The First Galaxies and Cosmic Reionisation 
• 7.5    Richard Ellis (University College London): The Assembly History of Elliptical Galaxies
• 10.5  Joonas Herranen (University of Helsinki): Well-behaving dust and other small particles – an overview to scattering dynamics
• 15.5  Jürgen Blum (IGep, TU Braunschweig): What comets can tell us about planetesimal formation
• 24.5  Tuomas Savolainen (Aalto University): First M87 Event Horizon Telescope Results: Imaging the Shadow of the supermassive black hole
• 28.5  Eric MacLennan (University of Helsinki): Asteroid Surfaces in the Thermal Infrared
• 18.6  Matthieu Schaller (Leiden University): Towards exa-scale for cosmological hydro simulations: Challenges and (some) solutions in the SWIFT code

Past Program Autumn 2018

• 8.8.   Colin Snodgrass (Open University, UK): It came from outer space: Interstellar visitor 1I/‘Oumuamua
• 10.8. Robert Nelson (Planetary Science Institute): Creating Planetary Regoliths in the Laboratory – What do Remote Sensing Observations tell us?
• 15.8. Moses Mogotsi (South African Astronomical Observatory): The Kinematics of SUNBIRD LIRGS
• 24.8. Lauri Haikala (Universidad de Atacama): ALMA observations of globulettes: formation sites of free floating planets?
• 4.9.   Xiaobin Wang (Yunnan Observatories, Chinese Academy of Sciences): Physical studies of near-Earth asteroid (3200) Phaethon
• 5.9.   Shenghong Gu (Yunnan Observatories, Chinese Academy of Sciences): Yunnan-Hong Kong wide field transit survey
• 14.9. Ellie Sansom (Curtin University): The Desert Fireball Network - Fireballs, Orbits and Meteorites
• 28.9. Stuart McAlpine (University of Helsinki): Growing black holes in the EAGLE simulation
• 12.10. Gastón Folatelli (Universidad Nacional de la Plata): The birth of a supernova
• 19.10. Jorma Harju (University of Helsinki): ALMA observations of a de-icing zone around a prestellar core
• 26.10. (teaching break)
• 1.11. Tuomo Salmi (University of Turku): Mass and radius constraints for neutron stars from X-ray timing, spectral and polarization observations
• 9.11. Pauli Pihajoki (University of Helsinki): Barycentric interpolation on Riemannian manifolds
• 14.11. Jan-Willem den Herder (SRON): High spectral resolution X-ray imaging with Athena: a new window on the hot and energetic Universe
• 30.11. Nico Krieger (MPIA): Zooming into the starburst environment of NGC253 and the Galactic Center
• 7.12.   Mika Saajasto (University of Helsinki): A stellar cluster in formation: cloud G074.11+00.11
• 14.12. Thomas Hackman (University of Helsinki): Long-term monitoring of stellar spot activity

Past Program Spring 2018

• 5.1. (teaching break)
• 12.1. (teaching break)
• 19.1. Marius Cautun (University of Durham): Revealing Local Group mysteries using dwarf galaxies
• 26.1. Mauri Valtonen (University of Turku): The host galaxy of the BL Lacertae object OJ287
• 2.2. Antton Luoma (University of Helsinki): Parametric studies of galaxy structure and morphology using GALFIT
• 9.2. Till Sawala (University of Helsinki): The Local Group in Eight Figures
• 16.2. Göran Maconi (University of Helsinki): Experimental light scattering by small particles: orientation-controlled 4π levitating scatterometer
• 23.2. Karri Muinonen (University of Helsinki): Light scattering in dense random media of cosmic dust using incoherent interactions
• 2.3. Johannes Markkanen (University of Helsinki): Numerical solutions for light scattering by cosmic dust and planetary regolith
• 9.3. (teaching break)
• 16.3. Mika Juvela (University of Helsinki): Polarisation observations of an infrared dark cloud
• 23.3. Rudy Wijnands (University of Amsterdam): Probing dense matter physics using the cooling of accretion-heated neutron-star crusts
• 28.3. Lankeswar Dey (University of Turku): Calculating hereditary contribution to gravitational radiation from eccentric binary black hole in blazar OJ287
• 30.3. (good Friday)
• 6.4  Antti Penttilä (University of Helsinki): Multiple scattering modeling pipeline for spectroscopy, polarimetry, and photometry
• 12.4 David Buckley (South African Astronomical Observatory): "Observing Transients at SAAO and SALT"
• 13.4 Florent Leclercq (Imperial College London): Bayesian large-scale structure inference, likelihood-based and likelihood-free approaches
• 20.4. Jukka Nevalainen (Tartu Observatory): Finding the missing baryons
• 27.4. Jussi Ahoranta (University of Helsinki): FUV Guided X-ray studies of WHIM: The evidence in the sight-line towards the quasar 3C273
• 4.5.  Till Sawala (University of Helsinki): The next 8 billion years of the Local Group
• 11.5. (teaching break)
• 25.5. Kirsi Lehto (University of Turku): Current topics in astrobiology
• 8.6. Jesús Escobar-Cerezo (University of Helsinki): Light scattering: an experimental and computational study of a lunar regolith analog
• 15.6. Guilhem Lavaux (IA Paris): Non-linear bayesian inference of cosmic fields in SDSS3 and 2M++ and their applications to nearby cosmology
• 20.6. Thorsten Naab (MPA Garching): High resolution galaxy evolution simulations with feedback from individual stars

Past Program Autumn 2017

• 22.8. Stefano Borgani (INAF - Astronomical Observatory of Trieste): Understanding Galaxy Clusters with Simulations 
• 1.9. Joop Schaye (University of Leiden): Simulating the formation of galaxies
• 8.9. Christopher Haines (Osservatorio Astronomico di Brera): VIPERS: The decline and fall of the most massive star-forming galaxies since z~1
• 15.9. Klaudia Kowalczyk (Nicolaus Copernicus Astronomical Center, Warsaw): Modelling dwarf spheroidals with Schwarzschild methods
• 29.9. Urs Ganse (University of Helsinki): Vlasiator: Simulating the entire Earth's Magnetosphere in Kinetic Physics
• 6.10. Jorma Sakari Harju and Kimmo Lehtinen (University of Helsinki): Asteroid occultations of radio galaxies
• 13.10. Lucile Turc (University of Helsinki): The outer regions of the near-Earth's space and their role during solar storms
• 20.10. Joonas Nättilä (University of Turku): Probing the nuclear physics of neutron stars with astrophysics
• 24.10. Roberto De Propris (University of Turku): The New Bulge
• 27.10. Lauri Siltala (University of Helsinki): Asteroid mass estimation with Markov-chain Monte Carlo
• 2.11.  Mordecai Mark Mac Low (Columbia University): Formation and Evolution of Giant Molecular Clouds: Gravity or Turbulence?
• 10.11. Lasse Liljedahl (University of Helsinki): The Effects of Supernova Feedback on Disk Galaxy Formation
• 17.11. Joachim Janz (University of Oulu/ FINCA): On the mass-size diagram of early-type galaxies and clues about the origins of low-mass early types
  and  Begoña Ascaso (Laboratoire Astroparticule & Cosmologie, Paris): Cluster cosmology with Euclid, LSST and J-PAS
• 24.11. Antti Rantala (University of Helsinki): Scouring the core of the early-type galaxy NGC 1600 with a supermassive black hole binary
• 8.12. Laura Zschaechner (Helsinki / FINCA): Gas Flows in Galaxies Part I: Emerging Observations and Modeling of Extra-planar Atomic and Molecular Gas in Nearby Galaxies
• 15.12. Anni Järvenpää (University of Helsinki): Mass Estimates of the Local Group

Past Program Spring 2017

• 27.1. Jimit Sanghvi (University of Turku):Evolution of low-mass quasars and environments of QSO pairs
• 3.2. Guilhem Lavaux (Institut d'Astrophysique de Paris): Cosmology with the Nearby Universe through full statistical reconstruction of wide galaxy surveys
• 10.2. Ronald Läsker (University of Turku): New aspects of the Black Hole scaling relations
• 17.2. Mikael Granvik (University of Helsinki): Near-Earth asteroids: from sources to sinks
• 24.2. David Martinez-Delgado (ARI Heidelberg): Stellar Tidal Streams in the halos of nearby spiral galaxies
• 3.3.  Akke Viitanen (University of Helsinki): The Clustering of Active Galactic Nuclei in the COSMOS field
• 17.3. Minna Myllys (University of Helsinki): Solar Wind-Magnetosphere Coupling Efficiency and Polar Cap Potential Saturation
• 24.3. Pauli Pihajoki (University of Helsinki): Ray-tracing and polarized radiative transfer in General Relativity
• 31.3. Teemu Willamo (University of Helsinki): Magnetic activity of V889 Herculis
• 7.4. Peter Johansson (University of Helsinki): Rapid formation of supermassive black holes in close proximity to embryonic protogalaxies
• 21.4. Lucien Kuiper (SRON - Netherlands Institute for Space Research): The high-energy twilight zone of magnetars and rotation-powered pulsars
• 28.4. Claudia Maraston (University of Portsmouth): Stellar population models: from galaxy formation to cosmology
• 5.5. Wara Chamani (Aalto University): Turbulent gas accretion between supermassive black holes and star-forming rings in the circumnuclear disk
• 12.5. Olivier Ilbert (Laboratoire d'Astrophysique de Marseille):  Galaxy stellar mass assembly from deep imaging surveys 
• 2.6. Lauri Jetsu (University of Helsinki): General Model for Light Curves of Chromospherically Active Binary Stars
• 19.6. Xiaoyan Zhou (Earth, Planetary and Space Science, University of California, Los Angeles): Effects of Interplanetary Shocks on the Lunar Wake

Past Program Autumn 2016

• 9.9     Joonas Herranen (University of Helsinki): Dynamics of Interstellar Dust Particles in Electromagnetic Radiation Fields
• 16.9   Timo Väisänen (University of Helsinki): Towards a new kind of radiative transfer
• 23.9   Chris Collins (Liverpool John Moores University, UK): The properties and evolution of Brightest Cluster Galaxies
• 30.9   Maria Gritsevich (University of Helsinki): The recovery of the Annama meteorite and the Finnish Fireball Network
• 7.10   Mika Juvela (University of Helsinki): Graphic details of interstellar medium
• 14.10 Till Sawala (University of Helsinki): Shaken and Stirred: The Milky Way's Dark Substructures
• 21.10 Mike West (Lowell Observatory): Galaxy Birth, Death and Reincarnation
• 28.10 Mika Saajasto (University of Helsinki): Correlation of gas dynamics and dust in the Herschel field G82.65-02.00
• 4.11   Jorma Harju (University of Helsinki): Nuclear spin ratios as clues to the origin of deuterated ammonia in dense interstellar clouds
• 11.11 Ghassem Gozaliasl (University of Helsinki): Evolution of the central galaxies in X-ray galaxy groups over 9 billion years
• 18.11 Thomas Hackman (University of Helsinki): Observing Stellar Dynamos in Action
• 25.11 Antti Rantala (University of Helsinki): KETJU: Post-Newtonian supermassive black hole dynamics in galaxy simulations
• 2.12   Natalia Lahén (University of Helsinki): Simulating the fate of the Antennae galaxies
• 9.12   Antti Penttilä (University of Helsinki): Asteroid phase curve analysis with the H,G1,G2 photometric phase function
• 16.12 Viola Allevato (University of Helsinki): Clustering properties of AGN at different redshifts, scales and luminosities
• 20.12 Extraordinary Seminar Evgeniya Petrova (Ural Federal University, Ekaterinburg, Russia): Texture of Chelyabinsk LL5 meteorite

Past Program Spring 2016

• 11.1  Extraordinary Seminar Daniel Mackowski (Auburn University, Alabama): Electromagnetic scattering by discretely inhomogeneous, plane parallel media: direct simulation strategies using high performance computing
• 15.1  Extraordinary Seminar Bryce Bolin (Observatoire de la Cote d'Azur, Nice, France): Identifying asteroid family Yarkovsky V-shape
• 22.1  Jyri Lehtinen (University of Helsinki): Activity of young solar-type stars
• 29.1  Violeta Gonzalez  (University of Durham): Issues with making galaxies in the computer relatively fast
• 5.2    Pauli Pihajoki (University of Helsinki): Black hole accretion disc impacts
• 12.2  Graham Smith (University of Birmingham, UK): Weak-lensing mass calibration of LoCuSS galaxy clusters and implications for "Planck Cosmology"
• 19.2  Mikael Granvik (University of Helsinki): Super-catastrophic disruption of asteroids at small perihelion distances
• 26.2  Peter Johansson (University of Helsinki): The formation of the first supermasssive black holes in the Universe
• 4.3    Johannes Markkanen (University of Helsinki): Fast solution for electromagnetic scattering by multiple targets
• 11.3  Teaching Break  
• 18.3  Tomas Kohout (University of Helsinki): ASPECT CubeSat mission to a binary asteroid Didymos
• 25.3  Easter Break
• 1.4    Lauri Jetsu (University of Helsinki): Shifting Milestones of Natural Sciences: The Ancient Egyptian Discovery of Algol’s Period Confirmed
• 8.4    Elisabetta Micelotta (University of Helsinki): Dust Destruction by the Reverse Shock in the Cassiopeia A Supernova Remnant
• 15.4  Lauri Siltala (University of Helsinki): Asteroid mass estimation using Markov Chain Monte Carlo techniques
• 22.4  Guilhem Lavaux (Institut d'Astrophysique de Paris): New statistical methods in the analysis of the dynamics of Large Scale Structures
• 29.4   Julien Moreau (University of Helsinki): Shock-darkening in ordinary chondrites: Insight to numerical modelling and what it can tell us
• 6.5     Ascension Day Break
• 13.5   Jesús Escobar-Cerezo (Instituto de Astrofísica de Andalucía, Granada, Spain): Light scattered by dust particles in the solar system: an experimental and computational approach
• 1.6     Noelia Jimenez (University of St. Andrews, UK): Why galaxies care about Supernovae Type Ia?
• 3.6     Deborah Domingue Lorin (Planetary Science Institute, Tucson): Photometry of Mercury's surface: Perspectives from the Camera and Spectrometer on Board MESSENGER

Past Program Autumn 2015

• 4.9   Craig Sarazin (University of Virginia): Mergers, Shocks, and the Dynamical State of Clusters of Galaxies
• 11.9  Jussi Väliviita  (University of Helsinki):  Does dark energy decay to dark matter?
• 16.9 Extraordinary Seminar Seshadri Nadathur (University of Helsinki): The nature of voids: simulations, theory, and use in cosmology
• 18.9  Astronomy Seminar moved to 16.10
• 25.9  Seppo Mikkola (University of Turku): Regularisation of Few-Body Dynamics  
• 2.10  Takayuki Tamura( ISAS/JAXA, Japan): X-ray spectroscopy of galaxy clusters with Suzaku and future ASTRO-H
• 9.10   Bo Reipurth (University of Hawaii): The Dynamical Evolution of Newborn Triple Systems
• 16.10  Karri Muinonen (University of Helsinki):  Asteroid light curve inversion with Lommel-Seeliger ellipsoids 
• 23.10  Adam Muzzin (University of Cambridge): The Formation of Galaxy Clusters and the Evolution of Their Galaxies at 0 < z < 2
• 30.10  No Astronomy Seminar
• 6.11   Nigul Olspert (Aalto University): Time series analysis of solar and stellar data. Case study: young solar analogue LQ Hya
• 13.11 Mika Juvela (University of Helsinki): Dust in the Milky Way
• 20.11 Brian Mazur (University of Toledo): Star Formation in Orion:  Wide, Young Binaries
• 27.11 Mika Saajasto (University of Helsinki): Studentships at the Nordic Optical Telescope
• 4.12   Till Sawala  (University of Helsinki): The APOSTLE simulations: solutions to the Local Group's cosmic puzzles
• 8.12   Extraordinary seminar Massimiliano Bonamente: Detection of a possible WHIM filament towards PG 1116+215 with Chandra and HST
• 11.12 Joonas Uusitalo  (University of Helsinki): The AD 775 radiocarbon anomaly - Caused by a solar flare

Past Program Spring 2015

• 16.1   Olli Wilkman: Lightcurve simulations for non-convex asteroids
• 23.1   Aleksi Vuorinen: Constraining neutron star matter with QCD 
• 30.1   John Regan: Simulations of the Universe 
• 6.2     Elizabeth Cole: Magnetic Activity of LQ Hya 
• 13.2   Ghassam Gozaliasl: Evolution of the central galaxies in X-ray galaxy groups 
• 20.2   Talvikki Hovatta (Metsähovi Radio Observatory):  Magnetic fields in blazar jets 
• 26.2   Extraordinary Seminar Martin Pessah: On the Dynamics of Helium in the Dilute Intracluster Medium  
• 27.2   Ronan Rochford: DYMPHNA3D: An introduction into the world of Pulsars
• 6.3     Teaching Break
• 20.3   Jussi Väliviita: Planck satellite and its cosmology results CANCELLED
• 26.3   Extraordinary Seminar Till Sawala: Local Group Galaxies Emerge from the Dark
• 27.3   Sebastien Muller: PKS1830-211: the molecular absorption at z=0.89 and the background blazar 
• 3.4     Easter Break
• 10.4   Jussi Ahoranta: High resolution X-ray analysis of ICM at core regions of NGC 4636 galaxy group
• 17.4   Erika Palmerio: Fine Structures in Coronal Mass Ejection-driven Sheath Regions
• 24.4   Natalia Lahén: Equal-mass Galaxy Mergers: Initial Conditions and Subresolution Astrophysics
• 29.4  Daniel Mege: The Planetary Highland Terrain Hopper: An all-terrain fractionated Solar System explorer
• 12.6  Extraordinary Seminar Dagmara Oszkiewicz: Traces of differentiation in the Flora region

Past Program Autumn 2014

• 9.9      Ciro Pinto: Turbulence in clusters of galaxies as revealed by X-ray spectroscopy
• 12.9    Felicia Ziparo: The role of the environment in the evolution of star formation 
• 17.9    Karel Nel: Drawing the Unimaginable, COSMOS
• 19.9    Mika Juvela: Star forming clouds in the Milky Way - observations from near-infrared to millimetre wavelengths.       
• 26.9    Thomas Hackman: Stellar spot activity - methods and results
• 3.10    Jan Snellman: Relaxation-type second-order closure models in astrophysical hydrodynamics
• 10.10  Clif Kirkpatrick: Hot Outflows in Galaxy Clusters
• 17.10  Julia Martikainen: Meteorite spectrometry using the University of Helsinki Vis-SWIR spectrometer
• 31.10  Simon Karl: Accurate dynamics around supermassive black holes with the hybrid tree-code "rVine"
• 4.11    Petri Väisänen (note Tuesday): SUNBIRD/SALT: Young massive star clusters and superwinds in strongly star-forming galaxies  
• 14.11  Pauli Pihajoki: Simulating the orbital dynamics of multiple black hole systems
• 21.11  Kimmo Kettula: Weak lensing mass calibration of galaxy groups and low mass clusters in the COSMOS and CFHTLS fields
• 28.11  Karri Muinonen: Coherent Backscattering by Particulate Media of Nonspherical Particles
• 5.12   No Seminar: Graduate school event
• 12.12  Olli Sipilä: H2D+ observations give an age of at least one million years for a cloud core forming Sun-like stars   

Past Program Spring 2014

• 17.1    Anton Baushev: The real and apparent convergence of N-body simulations of the dark matter structures: is the Navarro-Frenk-White profile real?
• 24.1    John Regan: Danger! Simulating the Collapse of Early Massive Black Holes.
• 31.1    Anne Virkki: Planetary radar research at the Arecibo Observatory
• 7.2      Grigori Fedorets: Spin and shape analyses for the slowly rotating asteroid (39420) 2084 T-2
• 14.2    Mika Juvela: C3PO strikes back - progress report on the project Galactic Cold Cores
• 21.2    Jyri Lehtinen: Time series observations of active stars
• 28.2    Mika Saajasto: Probing the properties of interstellar dust with infrared light scattering      
• 7.3      Extraordinary Seminar  Alberto Cellino: Physical properties of Asteroids  
• 14.3    Murray Brightman: Compton thick AGN in the distant Universe    
• 21.3    Antti Rantala: Cosmological Zoom-in Initial Conditions and the Formation of Galaxies 
• 28.3    Artem Kupri: Strong lensing as a test of the vacuum energy density in the Lambda-CDM model
• 4.4      Kimmo Kiiveri: Simulating Planck data - CMB timeline-to-map Monte Carlo simulations and beam window functions
• 11.4    Johanna Malinen: Interstellar medium and initial stages of star formation: comparing simulations and observations
• 18.4    Easter break --No seminar   
• 25.4    Jussi Aaltonen: Searching for dark matter in clusters of galaxies
• 30.4    Bodo Ziegler: The busy life of the cluster complex RXJ1347-11      

Past Program Autumn 2013

• 6.9      Peter Johansson: Modelling supermassive black holes in galaxy simulations
• 13.9    Jorma Harju: Observations and models of the evolution of prestellar cores   
• 20.9    Kimmo Kettula: Weak lensing calibration of scaling relations in galaxy groups.
• 27.9    Oskari Miettinen: A MALT90 study of the chemical properties of massive IRDC clumps
• 4.10    Jörn Warnecke: Bipolar magnetic structures driven by stratified turbulence with a coronal envelope 
• 11.10  Emilia Järvelä: Multifrequency study of radio-loud Narrow-line Seyfert 1 galaxies:  A search for spirals launching relativistic jets
• 18.10  Ghassem Gozaliasl: Evolution of the luminosity gap in X-ray galaxy groups from CFHTLS-XMM field
• 25.10  Bidya Binay Karak: Role of meridional circulation in modeling the solar cycle using the flux transport dynamo model     
• 1.11     Lauri Jetsu: Did the ancient egyptians record the period of the eclipsing binary Algol - The raging one?
• 8.11     Emily Freeland: Intergalactic Gas in Groups of Galaxies: Implications for Dwarf Spheroidal Formation and The Missing Baryons Problem
• 15.11   Anne Lähteenmäki: Multifrequency studies of active galactic nuclei
• 22.11   Mikael Granvik: Life and death of the Chelyabinsk asteroid
• 29.11   Karri Muinonen: Gaia - an ultraprecise survey of our Galaxy
• 6.12     Finnish Independence Day -- No seminar
• 13.12   Miikka Väisälä: High-resolution ammonia mapping of the very young protostellar core Chamaeleon-MMS1
• 18.12   Tom Millar: Complex Molecule Formation in Protoplanetary Disks

Past Program Spring 2013

• 18.1    Petri Käpylä: United approach to investigating stellar magnetic activity 
• 25.1    Francesco Miniati: Generation of Magnetic Field in Cosmic Structure
• 1.2      Lauri Haikala: The European Extremely Large Telescope (E-ELT)
• 7.2      Alana Rivera: Searching for Clues in High-Mass Star Formation (Note Thursday)   
• 15.2    Mikael Granvik: Constraints for the formation and evolution of planetary systems with the Large Synoptic Survey Telescope
• 22.2    Shinsuke Abe: Hayabusa-2; Sample return mission of a C-type asteroid (162173) 1999 JU3
• 28.2    Patricia Spinelli: Weak lensing analysis of galaxy systems (Note Thursday)
• 7.3      Masayuki Tanaka: High redshift groups of galaxies (Note Thursday)
• 8.3      Eva Schinnerer: The relation between ISM and star formation on cloud-scales - New insights from the Whirlpool galaxy  
• 22.3    Olli Sipilä: HD depletion in starless cores
• 26.3    Toshifumi Futamase: A new approximation for the non-linear DM power spectrum beyond BAO scales (Note Tuesday)
• 29.3    Easter break --No seminar
• 5.4      Sébastien Comerón: A deeper look on thick discs using data from the Spitzer Survey of Stellar Structure in Galaxies (S4G)
• 12.4    Hanna Pentikäinen: Laboratory spectrometry of meteorite samples at visible to near-infrared wavelengths
• 19.4    Kyösti Ryynänen: Life out of chaos
• 26.4    Viola Allevato: Halo occupation of X-ray AGN in the COSMOS field
• 3.5      Shaun Hotchkiss: The (misbehaving) integrated Sachs Wolfe effect from "superstructures"

Past Program: Autumn 2012

• 7.9      Maarit Mantere: Solar and stellar cycles: observations and MHD modelling
• 14.9    Heidi Yli-Kankahila: Formation of Early-type Galaxies through mergers of gas-rich disk galaxies
• 21.9    Elizabeth Cole: Doppler Imaging of LQ Hydrae
• 28.9    Karri Muinonen: Scattering of electromagnetic waves by Solar System objects: from the first principles to the new asteroid magnitude system
• 5.10    Olli Wilkman: Asteroid lightcurve phase shift from rough-surface shadowing
• 12.10  Mika Juvela: Update on the project Galactic Cold Cores
• 19.10  John Regan: Simulations of the Formation and Evolution of Super Massive Black Holes
• 26.10  Teaching break -- No seminar
• 1.11    Alexis Finoguenov: COnstrain Dark Energy with X-ray (CODEX) clusters. Colloqium talk, note the unsual time.  
• 9.11    Minja Mäkelä: Structure and star formation in cometary globules: NIR observations of CG1 and CG2
• 16.11  Jorma Harju: Observational tests for the chemistry and dynamical evolution of prestellar cores
• 23.11  Tuomas Lunttila: Radiative transfer modelling of interstellar clouds
• 30.11  Andi Hektor: Dark side of the Universe: enlightenment through gamma-rays
• 7.12    Thursday (6.12) is Finnish Independence Day -- No seminar
• 14.12  Ghassem Gozaliasl: Understanding the evolution of structure in the Universe with help of galaxy groups

Past Program: Spring 2012

• 16.1   Karri Muinonen: Asteroid orbital inversion using a virtual-observation Markov-chain Monte Carlo method
• 20.1   Maarit Mantere: "Alternative interpretation of starspots"
• 23.1   Hannakaisa Lindqvist: Stereophotogrammetry: a new way of modeling light scattering by mineral dust
• 27.1   Mika Juvela: "Herschel observations of cold interstellar clouds detected by Planck"
• 30.1   Mikael Granvik: Building near-Earth-object population models with data from CSS and NEOSSat
• 3.2     Julien Montillaud: "Between molecules and solid state: Interstellar PAHs and Very Small Grains"
• 6.2     Tomas Kohout: Magnetic susceptibility meter for asteroid regolith composition studies
• 10.2   Matts Roos: "Some recent astrophysics issues"
• 13.2   Victor Solea: An MC-MC approach to periodicity determination of variable stars
• 17.2   Thomas Hackman: "Stellar spot activity - some recent results"
• 24.2   Roberto De Propris: "Galaxy Mergers"
• 27.2   Lauri Pesonen: Meteorite Impact Cratering - Geophysical Aspects
• 2.3     Oskari Miettinen: "Infrared dark clouds - A case study of the filamentary IRDC G304.74+01.32"
• 5.3     Dagmara Oszkiewicz: Differentiated asteroid families - the missing link to the history of our Solar System
• 9.3     Teaching break -- No seminar
• 12.3   Jani Tyynelä: Applicability of the Rayleigh-Gans approximation for snowflakes at microwave frequencies
• 16.3   Jan Snellman: Some new results on hydrodynamical closure models
• 19.3   Anne Virkki: Circular polarization ratio for aggregates of spherical particles
• 23.3   Olli Sipilä: Chemical and physical modeling of prestellar cores
• 29.3.  Mark Rawlings: "The current status of ALMA"  (13:15 in D116)
• 30.3   Tuomas Lunttila: "Dust radiative transfer using hierarchical grids"
• 6.4     Easter break: No seminar
• 13.4   Paula Kyyrö: "The density profile and fragmentation of Taurus Molecular Cloud-1"
• 16.4   Evgenij Zubko: Light scattering by cometary dust: Large-particle contribution
• 20.4   Anna Parikka: "The physical and chemical state of cold dust cores mapped with Herschel"
• 23.4   Maria Gritsevich: How to catch a shooting star: Fireballs producing meteorites
• 27.4   Victor Solea: "Long-term photometric analysis of a chromospherically active variable star"
•  4.5    Hannu Kurki-Suonio: "Euclid - the next cosmology mission"
• 30.5.  Douglas Whittet: "Methanol in interstellar ices"
• 30.5   Emily Hardegree-Ullman: "Chemical and Physical Conditions of the core SL42 in the Corona Australis Molecular Cloud"
• 1.6.    Thorsten Naab: "Modelling the Antennae Galaxies"