Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session Q02: Recent Advances in our understanding of tidal disruption events in galactic nucleiInvited
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Sponsoring Units: DAP Chair: Enrico Ramirez-Ruiz, University of California, Santa Cruz Room: MG Salon A - 3rd Floor |
Monday, April 17, 2023 3:45PM - 4:21PM |
Q02.00001: Tidal disruption events: Progress, open questions and prospects Invited Speaker: Yvette Cendes A tidal disruption event (TDE) occurs when an ill-fated star wanders too close to a supermassive black hole (SMBH), and is torn apart by tidal forces. TDE observations offer a unique laboratory to measure SMBH masses and to study super-Eddington accretion and associated outflows. In radio wavelengths, observations can allow us to probe the environment around previously-dormant SMBHs, as well as the physical properties of the outflow itself. To date, ~100 TDEs are known, the majority of which are discovered by optical surveys and then followed-up at other wavelengths. |
Monday, April 17, 2023 4:21PM - 4:57PM |
Q02.00002: Tidal disruption events from intermediate mass black holes Invited Speaker: Charlotte Angus Intermediate mass black holes (IMBHs), the link between stellar black holes and the supermassive black holes we see at the hearts of local galaxies, are an elusive population. Thought be hidden within the hearts of most dwarf galaxies, they are observationally difficult to detect. To date, only a handful of IMBHs have been discovered. Our limited understanding of the number and density of these events currently hinders our understanding of SMBH growth, galaxy evolution mechanisms and the gravitational wave background. |
Monday, April 17, 2023 4:57PM - 5:33PM |
Q02.00003: 2022 LeRoy Apker Prize Lecture: On the nature of repeating tidal disruption events Invited Speaker: Matthew J Cufari Periodic nuclear transients have been detected with increasing frequency, with one such system—ASASSN-14ko—exhibiting highly regular outbursts on a timescale of 114 ± 1 days. It has been postulated that the outbursts from this source are generated by the repeated partial disruption of a star, but how the star was placed onto such a tightly bound orbit about the supermassive black hole remains unclear. We demonstrate that the Hills mechanism, where a binary system is destroyed by the tides of the black hole, can lead to the capture of a star on a 114 days orbit and with a pericenter distance that is comparable to the tidal radius of one of the stars within the binary. Thus, Hills capture can produce stars on tightly bound orbits that undergo repeated partial disruption, leading to a viable mechanism for generating not only the outbursts detected from ASASSN-14ko but periodic nuclear transients in general. |
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