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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20230926T170000
DTEND;TZID=Atlantic/Canary:20230926T180000
UID:iactalks-1714
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1714
CREATED:2023-09-26T17:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:IAU G5 talk: An irradiated-Jupiter analogue hotter than the Sun
DESCRIPTION:IAU G5 talk: An irradiated-Jupiter analogue hotter than the Sun
 \nDr. Na'ama Hallakoun\n\nPlanets orbiting close to hot stars experience i
 ntense extreme-ultraviolet radiation, potentially leading to atmosphere ev
 aporation and to thermal dissociation of molecules. However, this extreme 
 regime remains mainly unexplored due to observational challenges. Only a s
 ingle known ultra-hot giant planet, KELT-9b, receives enough ultraviolet r
 adiation for molecular dissociation, with a day-side temperature of ~4,600
 K. An alternative approach uses irradiated brown dwarfs as hot-Jupiter ana
 logues. With atmospheres and radii similar to those of giant planets, brow
 n dwarfs orbiting close to hot Earth-sized white dwarf stars can be direct
 ly detected above the glare of the star.In this talk I will present the di
 scovery of an extremely irradiated low-mass companion to the hot white dwa
 rf WD0032–317, focusing on the observational aspects of the discover
 y. Our analysis indicates a day-side temperature of ~8,000K, and a day-to-
 night temperature difference of ~6,000K. The amount of extreme-ultraviolet
  radiation received by WD0032–317B is equivalent to that received by
  planets orbiting close to stars as hot as late B-type stars, and about 5,
 600 times higher than that of KELT-9b. With a mass of ~75–88 Jupiter
  masses, this near-hydrogen-burning-limit object is potentially one of the
  most massive brown dwarfs known.\n \n 
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