PLANETARY CANDIDATES OBSERVED BY KEPLER. III. ANALYSIS OF THE FIRST 16 MONTHS OF DATA
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Batalha-2013-PLANETARY CANDIDATES.pdf
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1.89 MB
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Author(s)
Demory, Brice-Olivier
Date Issued
February 2013
Journal
The Astrophysical Journal. Supplement Series
Publisher
IOP Publishing
Citation
Batalha, Natalie M., Jason F. Rowe, Stephen T. Bryson, Thomas Barclay, Christopher J. Burke, Douglas A. Caldwell, Jessie L. Christiansen, et al. “PLANETARY CANDIDATES OBSERVED BY KEPLER . III. ANALYSIS OF THE FIRST 16 MONTHS OF DATA.” The Astrophysical Journal Supplement Series 204, no. 2 (February 1, 2013): 24. © 2013 The American Astronomical Society
Version
Final published version
Abstract
New transiting planet candidates are identified in 16 months (2009 May-2010 September) of data from the Kepler spacecraft. Nearly 5000 periodic transit-like signals are vetted against astrophysical and instrumental false positives yielding 1108 viable new planet candidates, bringing the total count up to over 2300. Improved vetting metrics are employed, contributing to higher catalog reliability. Most notable is the noise-weighted robust averaging of multi-quarter photo-center offsets derived from difference image analysis that identifies likely background eclipsing binaries. Twenty-two months of photometry are used for the purpose of characterizing each of the candidates. Ephemerides (transit epoch, T [subscript 0], and orbital period, P) are tabulated as well as the products of light curve modeling: reduced radius (R [subscript P]/R [subscript star]), reduced semimajor axis (d/R [subscript star]), and impact parameter (b). The largest fractional increases are seen for the smallest planet candidates (201% for candidates smaller than 2 R [subscript ⊕] compared to 53% for candidates larger than 2 R [subscript ⊕]) and those at longer orbital periods (124% for candidates outside of 50 day orbits versus 86% for candidates inside of 50 day orbits). The gains are larger than expected from increasing the observing window from 13 months (Quarters 1-5) to 16 months (Quarters 1-6) even in regions of parameter space where one would have expected the previous catalogs to be complete. Analyses of planet frequencies based on previous catalogs will be affected by such incompleteness. The fraction of all planet candidate host stars with multiple candidates has grown from 17% to 20%, and the paucity of short-period giant planets in multiple systems is still evident. The progression toward smaller planets at longer orbital periods with each new catalog release suggests that Earth-size planets in the habitable zone are forthcoming if, indeed, such planets are abundant.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1088/0067-0049/204/2/24
