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URL:https://murmitoyen.com/events/vanille/udem/detail/219233
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Archaeology of Extrasolar Terrestrial Planetary Systems 
DESCRIPTION:Jay Farihi\, IoA CambridgeRésumé/abstract:We now stand firml
 y in the era of solid exoplanet detection via Kepler and other state of th
 e art facilities. Yet the empirical characterization of these most intrigu
 ing planets is extremely challenging. Transit plus radial velocity data ca
 n yield planet mass and radius\, and hence planet density\, but the bulk c
 omposition remains degenerate and model?dependent. The abundances of a han
 dful of exoplanet atmospheres can be estimated from transit spectroscopy\,
  but probing only the tenuous outer layers of those planets. Fortunately\,
  as demonstrated by Spitzer and complementary ground?based observations\, 
 debris disk?polluted white dwarfs can yield highly accurate information on
  the mass and chemical structure of rocky minor planets (i.e. exo?asteroid
 s)\, the building blocks of solid exoplanets. The white dwarf distills the
  planetary fragments\, and provides powerful insight into elemental compos
 ition of the parent body. This archaeological method provides empirical da
 ta on the assembly and chemistry of exo-terrestrial planets that is unavai
 lable for any planetary system orbiting a main?sequence star. In the Solar
  System\, the asteroids (or minor planets) are leftover building blocks of
  the terrestrial planets\, and we obtain their compositions -- and hence t
 hat of the terrestrial planets -- by studying meteorites. Similarly\, one 
 can infer the composition of exo-terrestrial planets by studying tidally d
 estroyed and accreted asteroids at polluted white dwarfs. I will present o
 ngoing\, state of the art results using this unconventional technique\, em
 phasizing the lasting impact of infrared space missions like Spitzer. Some
  highlights will include the recent detection of terrestrial-like debris i
 n the Hyades star cluster\, as well as the detection of a few water-rich p
 lanetesimals that may represent the building blocks of habitable exoplanet
 s. Ce séminaire est présenté par le groupe astronomie et astrophysique
  du Département de physique de l'Université de Montréal.
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