Spitzer Observations Suggest a Low Kepler False Postive Rate.

Details Spitzer Observations Suggest a Low Kepler False Postive Rate. Spitzer Observations Suggest a Low Kepler False Postive Rate.

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.0403d&link_type=abstract

American Astronomical Society, ESS meeting #2, #4.03

Astronomy and Astrophysics

Astrophysics

Scientific paper

I present the results from a large project that uses 800 hours of the Spitzer Space Telescope to gather near-infrared photometric measurements of Kepler Object of Interest (KOI). The project's main purposes are to validate the planetary status of the Kepler candidates and to estimate observationally the Kepler false positive rate. A small amount of this telescope time is also dedicated to study the atmospheres of confirmed planets.
I revue the project and introduce our target sample which is composed of 34 candidates selected amongst the first 400 KOIs. This list contains mainly sub-Neptune sizes candidates orbiting a wide range of spectral type stars. I present the analysis of the complete sample. By comparing the transit light curves of candidates observed with Kepler and Spitzer, we can exclude significant sources of astrophysical false positives resulting from blends (eclipsing binaries, hierarchical triples, etc...) that can mimic an exoplanetary signature in the Kepler bandpass. I show that our measured Spitzer transit depths are almost entirely in agreement with the Kepler depths. Our results suggest that the Kepler false positive rate is extremely low.

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