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Title:
An Efficient Automated Validation Procedure for Exoplanet Transit Candidates
Authors:
Morton, Timothy D.
Affiliation:
AA(Department of Astrophysics, California Institute of Technology, MC 249-17, Pasadena, CA 91125, USA)
Publication:
The Astrophysical Journal, Volume 761, Issue 1, article id. 6, 12 pp. (2012). (ApJ Homepage)
Publication Date:
12/2012
Origin:
IOP
Astronomy Keywords:
planetary systems, stars: statistics
DOI:
10.1088/0004-637X/761/1/6
Bibliographic Code:
2012ApJ...761....6M

Abstract

Surveys searching for transiting exoplanets have found many more candidates than they have been able to confirm as true planets. This situation is especially acute with the Kepler survey, which has found over 2300 candidates but has to date confirmed only a small fraction of them as planets. I present here a general procedure that can quickly be applied to any planet candidate to calculate its false positive probability. This procedure takes into account the period, depth, duration, and shape of the signal; the colors of the target star; arbitrary spectroscopic or imaging follow-up observations; and informed assumptions about the populations and distributions of field stars and multiple-star properties. Applying these methods to a sample of known Kepler planets, I demonstrate that many signals can be validated with very limited follow-up observations: in most cases with only a spectrum and an adaptive optics image. Additionally, I demonstrate that this procedure can reliably identify false positive signals. Because of the computational efficiency of this analysis, it is feasible to apply it to all Kepler planet candidates in the near future, and it will streamline the follow-up efforts for Kepler and other current and future transit surveys.
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