LESIA - Observatoire de Paris

International Deep Planet Survey and Keck survey : 300 stars to determine the wide-separated planets frequency

jeudi 15 mars 2012, par Raphaël Galicher (Herzberg institute of astrophysics)

Mercredi 21 mars 2012 à 14h30 , Lieu : Salle de conférence du bât. 17

Over the past several years, our team has observed more than 300 nearby young stars with adaptive optics systems at Gemini (NIRI/NICI), Keck (Nirc2) and VLT (Naco). One unique aspect of our survey was the inclusion of a large sample of more massive young AF stars that have generally been neglected in first generation surveys, as the contrast and target distances are less favorable to image planets/brown dwarfs. Our most significant discovery of this campaign is the HR 8799 multi-planet system. This finding allows, for the first time, an estimate of the Jovians planet population > 5 AU (instead of deriving upper limits). During my talk, I will present the combined IDPS sample and the combined IDPS/GDPS/DISYNAS samples. I will then show images of the planets and the planet-candidates we detected in the IDPS data. I will eventually present preliminary results on the Jupiter-like planet frequency between 5 and 200AU.