[Okc-wp4] EO meeting: 23rd of September

[Davide Gizzi]

Dear colleagues,

our first EO meeting for the fall will take place this Thursday at 13:15 via Zoom.
To join access: https://stockholmuniversity.zoom.us/j/67378581617


This week we have Panos Charalampopoulos, PhD student of Giorgos Leloudas from the  Technical University of Denmark (DTU) in Copenhagen. He has been working on Tidal Disruption Events (TDEs) observations and he is visiting Stockholm to work with Mattia Bulla on modeling polarization signals from TDEs.

He will present his latest work on TDEs observations. Below is title and abstract:

Title:
Insights into Tidal Disruption Events: a spectroscopic study

Abstract:
Tidal disruption events (TDEs) occur when a star gets too close to a super-massive black hole (SMBH) lurking in the nucleus of a galaxy and gets ripped apart by the black hole’s strong gravitational field. Stellar debris fall back as a stream which self-intersects, shocks, and forms a rotationally-supported accretion disk. These processes result in a strong luminous transient flare (Lbol ~ 10^{41}-10^{44} erg/s). Spectroscopically, tidal disruption events (TDEs) are characterized by broad (~ 10^{4} km/s) emission lines and show large diversity as well as different line profiles. In this talk, I will present my results of a detailed spectroscopic population study of 16 optical/UV TDEs. After carefully and consistently performing a series of data reduction tasks including host galaxy light subtraction, I study a number of emission lines prominent among TDEs including Hydrogen, Helium and Bowen lines and quantify their evolution with time in terms of line luminosities, velocity widths and velocity offsets. I will discuss discovered time-lags between the continuum and the emission lines, evolution of line luminosities and luminosity ratios with time and with respect to their photometric properties and try explain the large diversity of the spectroscopic features seen in TDEs along with their X-ray properties based on viewing angle effects.

Feel free to share the Zoom link with newcomers who are not in the OKC mailing list but who might be interested to the talk. If they want to be added to the mailing list they can send a request to Okc-wp4-join at fysik.su.se.

Hope to see you there!

Ana Sagués Carracedo & Davide Gizzi
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