Instytut Astronomii

KontaktPiwnice k. Torunia, 87-148 Łysomice
tel.: +48 56 611 30 10
fax: +48 56 611 30 09

Seminarium Ogólne

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Seminarium odbywa się w Piwnicach w sali wykładowej budynku Radioastronomii. Początek o godzinie 11.15.
Udział w seminarium w trybie zdalnym za pośrednictwem BigBlueButton (BBB).


18 marca 2024

“Magnetic flux saturation mechanism at accreting black holes”

dr hab. Krzysztof Nalewajko, prof. CAMK PAN (CAMK PAN)

Streszczenie:
Black holes (BH) acquire relativistic magnetospheres by accreting magnetized gas. Once they collect significant magnetic flux across the horizon, aided by the spin they can drive powerful relativistic jets by the Blandford-Znajek mechanism. Large enough BH magnetic flux backreacts on the accretion flow, which has been described in terms of arresting or choking. Magnetic flux eruptions have been identified as the mechanism of BH magnetic flux saturation. These eruptions can potentially dissipate a large fraction of magnetic energy in the BH magnetosphere by means of relativistic magnetic reconnection, accelerating particles and producing flares of non-thermal radiation. We analyze the results of 3D general-relativistic ideal magnetohydrodynamic (GRMHD) numerical simulations of accretion flows onto magnetically saturated Kerr BHs, focusing on the initiation of magnetic flux eruptions.


25 marca 2024

“Exploring exoplanets with radial velocity observations”

mgr Hannah Osborne (Mullard Space Science Laboratory, University College London, Wielka Brytania)

Streszczenie:
The first confirmed exoplanet orbiting a main sequence star was detected by the radial velocity (RV) method, and in the nearly 30 years since then the technique has continued to improve. In this talk I will highlight some of the benefits of using RVs to study exoplanets, as well as some of the struggles ? particularly from an observational perspective. I will also present some recent work using RV observations to characterise a newly discovered small planet which sits inside the small planet radius valley and could have a water-world composition. Finally, I will give an overview of what we can expect with future RV observations and the potential implications for exoplanets more generally.


8 kwietnia 2024

dr Simon Pfeifer (Leibniz-Institute for Astrophysics Potsdam, Niemcy)


15 kwietnia 2024

dr hab. Rodolfo Smiljanic, prof. CAMK PAN (CAMK PAN)


22 kwietnia 2024

TBA


29 kwietnia 2024

prof. Vincent Van Eylen (Mullard Space Science Laboratory, Department of Space and Climate Physics, University College London, Wielka Brytania)


6 maja 2024

dr hab. Agnieszka Gil-Świderska, prof. UwS (Instytut Matematyki, Uniwersytet w Siedlcach; CBK PAN)


13 maja 2024

prof. dr hab. Szymon Kozłowski (Obserwatorium Astronomiczne, Uniwersytet Warszawski)


20 maja 2024

prof. dr hab. Andrzej Pigulski (Instytut Astronomiczny, Uniwersytet Wrocławski)


27 maja 2024

prof. dr hab. Krzysztof Goździewski (Instytut Astronomii, Uniwersytet Mikołaja Kopernika)


3 czerwca 2024

dr Michał Drahus (Obserwatorium Astronomiczne, Uniwersytet Jagielloński, Kraków)


10 czerwca 2024

prof. Norbert Werner (Department of Theoretical Physics and Astrophysics, Masaryk University, Brno, Czechy)


24 czerwca 2024

prof. Markus Boettcher (Centre for Space Research, North-West University, Potchefstroom, Republika Południowej Afryki)