Characteristics of planetary candidates observed by Kepler, II: Analysis of the first four months of data
Creators: name: Borucki, William J.
name: Koch, David G.
name: Basri, Gibor
name: Batalha, Natalie
name: Brown, Timothy M.
name: Bryson, Stephen T.
name: Caldwell, Douglas
name: Christensen-Dalsgaard, Jørgen
name: Cochran, William D.
name: DeVore, Edna
name: Dunham, Edward W.
name: Gautier, Thomas N.
name: Geary, John C.
name: Gilliland, Ronald
name: Gould, Alan
name: Howell, Steve B.
name: Jenkins, Jon M.
name: Latham, David W.
name: Lissauer, Jack J.
name: Marcy, Geoffrey W.
name: Rowe, Jason
name: Sasselov, Dimitar
name: Boss, Alan
name: Charbonneau, David
name: Ciardi, David
name: Doyle, Laurance
name: Dupree, Andrea K.
name: Ford, Eric B.
name: Fortney, Jonathan
name: Holman, Matthew J.
name: Seager, Sara
name: Steffen, Jason H.
name: Tarter, Jill
name: Welsh, William F.
name: Allen, Christopher
name: Buchhave, Lars A.
name: Christiansen, Jessie L.
name: Clarke, Bruce D.
name: Désert, Jean-Michel
name: Endl, Michael
name: Fabrycky, Daniel
name: Fressin, Francois
name: Haas, Michael
name: Horch, Elliott
name: Howard, Andrew
name: Isaacson, Howard
name: Kjeldsen, Hans
name: Kolodziejczak, Jeffery
name: Kulesa, Craig
name: Li, Jie
name: Machalek, Pavel
name: McCarthy, Donald
name: MacQueen, Phillip
name: Meibom, Søren
name: Miquel, Thibaut
name: Prsa, Andrej
name: Quinn, Samuel N.
name: Quintana, Elisa V.
name: Ragozzine, Darin
name: Sherry, William
name: Shporer, Avi
name: Tenenbaum, Peter
name: Torres, Guillermo
name: Twicken, Joseph D.
name: Van Cleve, Jeffrey
name: Walkowicz, Lucianne
Publisher: name: arXiv
Year: 2011
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: On 1 February 2011 the Kepler Mission released data for 156,453 stars observed from the beginning of the science observations on 2 May through 16 September 2009. There are 1235 planetary candidates with transit like signatures detected in this period. These are associated with 997 host stars. Distributions of the characteristics of the planetary candidates are separated into five class-sizes; 68 candidates of approximately Earth-size (radius &lt; 1.25 Earth radii), 288 super-Earth size (1.25 Earth radii &lt; radius &lt; 2 Earth radii), 662 Neptune-size (2 Earth radii &lt; radius &lt; 6 Earth radii), 165 Jupiter-size (6 Earth radii &lt; radius &lt; 15 Earth radii), and 19 up to twice the size of Jupiter (15 Earth radii &lt; radius &lt; 22 Earth radii). In the temperature range appropriate for the habitable zone, 54 candidates are found with sizes ranging from Earth-size to larger than that of Jupiter. Five are less than twice the size of the Earth. Over 74% of the planetary candidates are smaller than Neptune. The observed number versus size distribution of planetary candidates increases to a peak at two to three times Earth-size and then declines inversely proportional to area of the candidate. Our current best estimates of the intrinsic frequencies of planetary candidates, after correcting for geometric and sensitivity biases, are 6% for Earth-size candidates, 7% for super-Earth size candidates, 17% for Neptune-size candidates, and 4% for Jupiter-size candidates. Multi-candidate, transiting systems are frequent; 17% of the host stars have multi-candidate systems, and 33.9% of all the candidates are part of multi-candidate systems.
description: 106 pages, 15 figures, contains tables of candidates. Submitted to ApJ