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URL:https://murmitoyen.com/events/vanille/udem/detail/401302
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:In the Spotlight: Small Planets Transiting Bright Stars 
DESCRIPTION:Conférence de Diana Dragomir\, UCSBRésuméThe number of known
  transiting planets has more than tripled in the years since Kepler was la
 unched\, mainly thanks to the abundant harvest delivered by the mission it
 self. Statistical analyses of these and the significantly more numerous Ke
 pler planet candidates indicate that smaller planets are more common than 
 large ones. Super-Earths (planets with radii between 1 and 4 R_Earth) are 
 of particular interest because they constitute a class of objects which ar
 e not represented in our Solar System. Moreover\, they can theoretically h
 ave a wide range of compositions which we are just beginning to explore ob
 servationally. While studies based on Kepler data have revolutionized many
  areas of exoplanet research\, the relative faintness of most of the host 
 stars in the Kepler field means that follow-up observations of these syste
 ms with other instruments is very difficult. Such observations include hig
 h-precision radial velocity measurements\, interferometric measurements of
  the host star's radius and exoplanetary atmospheric studies\, all of whic
 h contribute to the determination of the planets' properties.In order to b
 etter understand the nature of these widespread super-Earths\, we therefor
 e need to construct a sample of these objects that transit bright stars. A
 t present\, the most efficient way toward this goal is to photometrically 
 monitor the predicted transit windows of known radial velocity planets wit
 h minimum masses in the super-Earth regime (< 10-15 M_Earth). The two such
  super-Earth transit detections so far\, HD 97658b and 55 Cnc e\, have alr
 eady triggered numerous follow-up studies of these systems using both grou
 nd- and space-based instruments. I will discuss ongoing transit search pro
 grams with the MOST and Spitzer space telescopes - which are responsible f
 or these detections - and summarize the current state of knowledge of thes
 e two systems.Présentée par le Groupe Astronomie et astrophysique du D
 épartement de physique de l'Université de Montréal. Cette conférence e
 st destinée à des spécialistes dans le domaine de l'astrophysique et se
 ra donnée en anglais.
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