BEGIN:VCALENDAR
VERSION:2.0
PRODID:https://murmitoyen.com/events/vanille/udem/
X-WR-TIMEZONE:America/Montreal
BEGIN:VEVENT
UID:69e1a30dc2395
DTSTAMP:20260416T230341
DTSTART:20130131T113000
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20130131T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/174382
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Signposts of planetary systems around metal-rich white dwarfs
DESCRIPTION:Roman Rafikov\, PrincetonRésumé/abstract:Recent Spitzer obser
 vations have revealed presence of near-IR excesses in spectra of more than
  a dozen of metal-rich white dwarfs. These excesses are naturally interpre
 ted as resulting from reprocessing stellar emission by compact\, optically
  thick disks of dusty debris. The prevalent idea for their origin is the t
 idal disruption of asteroids scattered by massive unseen planets providing
  evidence for existence of the latter around white dwarfs. This circumstel
 lar material has also been proposed as the cause of high-Z element polluti
 on of host white dwarf atmospheres. I will provide an overview of observat
 ions in this rapidly developing area\, and will describe recent progress i
 n understanding the transfer of high-Z material from the compact circumste
 llar debris disk onto the white dwarf surface.Ce séminaire est présenté
  par le groupe astronomie et astrophysique du Département de physique de
  l'Université de Montréal.
END:VEVENT
BEGIN:VTIMEZONE
TZID:America/Montreal
X-LIC-LOCATION:America/Montreal
END:VTIMEZONE
END:VCALENDAR