Show simple item record

dc.contributor.authorDésert, Jean-Michel
dc.contributor.authorCharbonneau, David
dc.contributor.authorTorres, Guillermo
dc.contributor.authorFressin, François
dc.contributor.authorBallard, Sarah
dc.contributor.authorBryson, Stephen T.
dc.contributor.authorKnutson, Heather A.
dc.contributor.authorBatalha, Natalie M.
dc.contributor.authorBorucki, William J.
dc.contributor.authorBrown, Timothy M.
dc.contributor.authorDeming, Drake
dc.contributor.authorFord, Eric B.
dc.contributor.authorFortney, Jonathan J.
dc.contributor.authorGilliland, Ronald L.
dc.contributor.authorLatham, David Winslow
dc.contributor.authorSeager, Sara
dc.date.accessioned2017-01-10T22:43:50Z
dc.date.issued2015
dc.identifier.citationDésert, Jean-Michel, David Charbonneau, Guillermo Torres, François Fressin, Sarah Ballard, Stephen T. Bryson, Heather A. Knutson, et al. 2015. Low False-Positive Rate of Kepler Candidates Estimated From a Combination of Spitzer and Follow-Up Observations. The Astrophysical Journal 804, no. 1: 59. doi:10.1088/0004-637x/804/1/59.en_US
dc.identifier.issn1538-4357en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:29914194
dc.description.abstractNASA’s Kepler mission has provided several thousand transiting planet candidates during the four years of its nominal mission, yet only a small subset of these candidates have been confirmed as true planets. Therefore, the most fundamental question about these candidates is the fraction of bona fide planets. Estimating the rate of false positives of the overall Kepler sample is necessary to derive the planet occurrence rate. We present the results from two large observational campaigns that were conducted with the Spitzer Space Telescope during the the Kepler mission. These observations are dedicated to estimating the false positive rate (FPR) amongst the Kepler candidates. We select a sub-sample of 51 candidates, spanning wide ranges in stellar, orbital and planetary parameter space, and we observe their transits with Spitzer at 4.5 µm. We use these observations to measures the candidate’s transit depths and infrared magnitudes. An authentic planet produces an achromatic transit depth (neglecting the modest effect of limb darkening). Conversely a bandpass-dependent depth alerts us to the potential presence of a blending star that could be the source of the observed eclipse: a false-positive scenario. For most of the candidates (85%), the transit depths measured with Kepler are consistent with the transit depths measured with Spitzer as expected for planetary objects, while we find that the most discrepant measurements are due to the presence of unresolved stars that dilute the photometry. The Spitzer constraints on their own yield FPRs between 5-40%, depending on the KOIs. By considering the population of the Kepler field stars, and by combining follow-up observations (imaging) when available, we find that the overall FPR of our sample is low. The measured upper limit on the FPR of our sample is 8.8% at a confidence level of 3σ. This observational result, which uses the achromatic property of planetary transit signals that is not investigated by the Kepler observations, provides an independent indication that Kepler ’s false positive rate is low.en_US
dc.description.sponsorshipAstronomyen_US
dc.language.isoen_USen_US
dc.publisherIOP Publishingen_US
dc.relation.isversionofdoi:10.1088/0004-637x/804/1/59en_US
dc.relation.hasversionhttps://arxiv.org/pdf/1503.03173.pdfen_US
dash.licenseOAP
dc.subjectplanetary systemsen_US
dc.subjecttransitsen_US
dc.subjecttechniques: photometryen_US
dc.titleLow False-Positive Rate of Kepler Candidates Estimated From a Combination of Spitzer and Follow-Up Observationsen_US
dc.typeJournal Articleen_US
dc.description.versionAccepted Manuscripten_US
dc.relation.journalThe Astrophysical Journalen_US
dash.depositing.authorCharbonneau, David
dc.date.available2017-01-10T22:43:50Z
dc.identifier.doi10.1088/0004-637x/804/1/59*
dash.authorsorderedfalse
dash.contributor.affiliatedTorres, Guillermo
dash.contributor.affiliatedCharbonneau, David
dash.contributor.affiliatedLatham, David


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record