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DTSTART:20150911T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/628075-conference-a-v
 enir
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Kepler 138b - A Mars-size planet in a Tug-of-War - Jason Rowe (UdeM
 )
DESCRIPTION:Kepler 138b - A Mars-size planet in a Tug-of-War
\nJason Rowe (
 UdeM)
\nThousands of extrasolar planets have been found with with a wide r
 ange of masses and radii yet only small fraction of these planets have had
  both their mass and radius measured.  Having both the mass and radius gi
 ves insight towards the bulk composition of a planet. Dr. Rowe will presen
 t an analysis of the 3-planet transiting Kepler-138 system where his group
  was able to measure the mass and radius of a planet smaller than the Eart
 h. This was accomplished by using the depth of the transit to determine th
 e radius and transiting-timing-variations to determine the mass. Transitin
 g-timing-variations are due to the gravitational pull of planets on each o
 ther causing departures from Keplerian orbits.  The amplitude and time-sc
 ale of the gravitational perturbations is directly related to the masses o
 f each of the known planets. Rowe and the team measured the mass of the Ma
 rs-sized inner planet based on on the transit times of its neighbour and t
 hereby provide the first density measurement for an exoplanet smaller than
  Earth. The middle and outer planets are both slightly larger than Earth. 
 The middle planet's density is similar to that of Earth\, while the outer 
 planet is less than half as dense\, implying that it contains a greater po
 rtion of low density components such as H2O and/or H2. Having a radius me
 asurement alone is insufficient to state whether a planet is Earth-like or
  rocky in composition\, having a mass measurement is critically important.
  The method of using transiting-timing-variations to determine masses of p
 lanets Earth-sized and smaller promises to be a powerful technique and wil
 l allow us to probe the basic properties of small extrasolar planets.
\nCe
 tte conférence s'adresse à tous\, y compris les professeurs\, les cherch
 eurs et les étudinats des trois cycles. Le café est servi à partir de 1
 1h30.
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