Details

Autor(en) / Beteiligte

• Nielsen, Eric L.
• De Rosa, Robert J.
• Macintosh, Bruce
• Wang, Jason J.
• Ruffio, Jean-Baptiste
• Chiang, Eugene
• Marley, Mark S.
• Saumon, Didier
• Savransky, Dmitry
• Mark Ammons, S.
• Bailey, Vanessa P.
• Barman, Travis
• Blain, Célia
• Bulger, Joanna
• Burrows, Adam
• Chilcote, Jeffrey
• Cotten, Tara
• Czekala, Ian
• Doyon, Rene
• Duchêne, Gaspard
• Esposito, Thomas M.
• Fabrycky, Daniel
• Fitzgerald, Michael P.
• Follette, Katherine B.
• Fortney, Jonathan J.
• Gerard, Benjamin L.
• Goodsell, Stephen J.
• Graham, James R.
• Greenbaum, Alexandra Z.
• Hibon, Pascale
• Hinkley, Sasha
• Hirsch, Lea A.
• Hom, Justin
• Hung, Li-Wei
• Ilene Dawson, Rebekah
• Ingraham, Patrick
• Kalas, Paul
• Konopacky, Quinn
• Larkin, James E.
• Lee, Eve J.
• Lin, Jonathan W.
• Maire, Jérôme
• Marchis, Franck
• Marois, Christian
• Metchev, Stanimir
• Millar-Blanchaer, Maxwell A.
• Morzinski, Katie M.
• Oppenheimer, Rebecca
• Palmer, David
• Patience, Jennifer
• Perrin, Marshall
• Poyneer, Lisa
• Pueyo, Laurent
• Rafikov, Roman R.
• Rajan, Abhijith
• Rameau, Julien
• Rantakyrö, Fredrik T.
• Ren, Bin
• Schneider, Adam C.
• Sivaramakrishnan, Anand
• Song, Inseok
• Soummer, Remi
• Tallis, Melisa
• Thomas, Sandrine
• Ward-Duong, Kimberly
• Wolff, Schuyler

Titel

The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics from 10 to 100 au

Ist Teil von

• The Astronomical journal, 2019-07, Vol.158 (1), p.13

Ort / Verlag

Madison: The American Astronomical Society

Erscheinungsjahr

2019

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We present a statistical analysis of the first 300 stars observed by the Gemini Planet Imager Exoplanet Survey. This subsample includes six detected planets and three brown dwarfs; from these detections and our contrast curves we infer the underlying distributions of substellar companions with respect to their mass, semimajor axis, and host stellar mass. We uncover a strong correlation between planet occurrence rate and host star mass, with stars M* > 1.5 M more likely to host planets with masses between 2 and 13MJup and semimajor axes of 3-100 au at 99.92% confidence. We fit a double power-law model in planet mass (m) and semimajor axis (a) for planet populations around high-mass stars (M* > 1.5 M ) of the form , finding = −2.4 0.8 and β = −2.0 0.5, and an integrated occurrence rate of % between 5-13MJup and 10-100 au. A significantly lower occurrence rate is obtained for brown dwarfs around all stars, with % of stars hosting a brown dwarf companion between 13-80MJup and 10-100 au. Brown dwarfs also appear to be distributed differently in mass and semimajor axis compared to giant planets; whereas giant planets follow a bottom-heavy mass distribution and favor smaller semimajor axes, brown dwarfs exhibit just the opposite behaviors. Comparing to studies of short-period giant planets from the radial velocity method, our results are consistent with a peak in occurrence of giant planets between ∼1 and 10 au. We discuss how these trends, including the preference of giant planets for high-mass host stars, point to formation of giant planets by core/pebble accretion, and formation of brown dwarfs by gravitational instability.