Events List

DateEvent TypeSpeaker
09/06/2023Informal Astro TalkTaeho 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)
09/06/2023HEP Journal Club [ + ]
09/06/2023HEP SeminarBobby Acharya [ + ]
09/06/2023Oral DefenseJack Donahue [ + ]
09/07/2023Physics Dept ColloquiumDaniel Rokhsar [ + ]
09/11/2023CCPP Brown BagMichael Blanton [ + ]
09/12/2023Astro SeminarKaze Wong [ + ]
09/12/2023Informal HEP TalkTom Shachar [ + ]
09/12/2023Cosmic Happy HourCalvin Chen [ + ]
09/13/2023HEP Journal Club [ + ]
09/13/2023HEP SeminarDa Liu [ + ]
09/13/2023MeetingGaston Giribet [ + ]
09/14/2023Physics Dept ColloquiumLaure Zanna [ + ]
09/15/2023Informal HEP TalkGleb Aminov [ + ]
09/18/2023CCPP Brown BagMichael Blanton [ + ]
09/19/2023Astro SeminarNia Imara [ + ]
09/20/2023HEP Journal Club [ + ]
09/20/2023HEP SeminarHirosi Ooguri [ + ]
09/20/2023CCPP Pheno Journal Club [ + ]
09/21/2023Physics Dept ColloquiumHiroshi Oguri [ + ]
09/22/2023ArXiv DiscussionPostdocs [ + ]
09/25/2023CCPP Brown BagAhmed Almheiri [ + ]
09/25/2023Informal Astro TalkJordan Flitter [ + ]
09/26/2023Astro SeminarGiulio Fabbian [ + ]
09/27/2023HEP Journal Club [ + ]
09/27/2023HEP SeminarJosh Foster [ + ]
09/27/2023Informal HEP TalkGabriele Rigo [ + ]
09/28/2023Informal Astro TalkChristopher Tiede [ + ]
09/28/2023Physics Dept ColloquiumMiles Stoudenmire [ + ]
09/29/2023ArXiv DiscussionPostdocs [ + ]
09/29/2023HET Discussion SessionZare [ + ]