| Date | Event Type | Speaker | |
| 09/06/2023 | Informal Astro Talk | Taeho Ryu [ -- ] | |
| Title: Two types of nuclear transients - tidal disruption events and disruptive collisions Abstract: Galactic nuclei are extreme environments where stars are densely packed around a supermassive black hole (SMBH). Occasionally, dynamical interactions in the galactic center lead the stars to interact violently at short distances with each other or with the SMBH, resulting in the formation of nuclear transients. In this talk, I will discuss two types of nuclear transients, tidal disruption events and high-velocity collisions between stars, based on the results of detailed hydrodynamics simulations. Tidal disruption events are one of the most dramatic nuclear transients in which a star is tidally disrupted by the SMBH in a few hours. The conventional picture has been that a star is fully disrupted at the first pericenter passage and the debris circularizes rapidly. However, these events are in fact more diverse and they can be categorized into several groups with different observational signatures depending on stellar pericenter distance, from partial disruption (i.e., partial mass loss and surviving remnant) to full disruption which is further sub-categorized depending on relativistic effects. On the other hand, disruptive collisions are the events where two stars collide at a very high relative velocity near the central SMBH. The collision product, a homologously expanding gas cloud, can generate a flare as bright as tidal disruption events. Subsequently, the expanding gas cloud would interact with the nearby SMBH, causing a second, possibly even brighter accretion-driven flare. Because these can happen near BHs at any mass scale, if the accretion is efficient, these disruptive collisions could contribute to the growth of black holes. (12:30 PM - 1:00 PM, 726 Broadway, 902, Lg Conf) | |||
| 09/06/2023 | HEP Journal Club | [ + ] | |
| 09/06/2023 | HEP Seminar | Bobby Acharya [ + ] | |
| 09/06/2023 | Oral Defense | Jack Donahue [ + ] | |
| 09/07/2023 | Physics Dept Colloquium | Daniel Rokhsar [ + ] | |
| 09/11/2023 | CCPP Brown Bag | Michael Blanton [ + ] | |
| 09/12/2023 | Astro Seminar | Kaze Wong [ + ] | |
| 09/12/2023 | Informal HEP Talk | Tom Shachar [ + ] | |
| 09/12/2023 | Cosmic Happy Hour | Calvin Chen [ + ] | |
| 09/13/2023 | HEP Journal Club | [ + ] | |
| 09/13/2023 | HEP Seminar | Da Liu [ + ] | |
| 09/13/2023 | Meeting | Gaston Giribet [ + ] | |
| 09/14/2023 | Physics Dept Colloquium | Laure Zanna [ + ] | |
| 09/15/2023 | Informal HEP Talk | Gleb Aminov [ + ] | |
| 09/18/2023 | CCPP Brown Bag | Michael Blanton [ + ] | |
| 09/19/2023 | Astro Seminar | Nia Imara [ + ] | |
| 09/20/2023 | HEP Journal Club | [ + ] | |
| 09/20/2023 | HEP Seminar | Hirosi Ooguri [ + ] | |
| 09/20/2023 | CCPP Pheno Journal Club | [ + ] | |
| 09/21/2023 | Physics Dept Colloquium | Hiroshi Oguri [ + ] | |
| 09/22/2023 | ArXiv Discussion | Postdocs [ + ] | |
| 09/25/2023 | CCPP Brown Bag | Ahmed Almheiri [ + ] | |
| 09/25/2023 | Informal Astro Talk | Jordan Flitter [ + ] | |
| 09/26/2023 | Astro Seminar | Giulio Fabbian [ + ] | |
| 09/27/2023 | HEP Journal Club | [ + ] | |
| 09/27/2023 | HEP Seminar | Josh Foster [ + ] | |
| 09/27/2023 | Informal HEP Talk | Gabriele Rigo [ + ] | |
| 09/28/2023 | Informal Astro Talk | Christopher Tiede [ + ] | |
| 09/28/2023 | Physics Dept Colloquium | Miles Stoudenmire [ + ] | |
| 09/29/2023 | ArXiv Discussion | Postdocs [ + ] | |
| 09/29/2023 | HET Discussion Session | Zare [ + ] | |