Photometric analysis of the system Kepler-1

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dc.authoridPuskullu, Caglar/0000-0001-9213-0969
dc.authoridBanks, Timothy/0000-0001-9445-4588
dc.contributor.authorBudding, E.
dc.contributor.authorRhodes, M. D.
dc.contributor.authorPuskullu, C.
dc.contributor.authorJi, Y.
dc.contributor.authorErdem, A.
dc.contributor.authorBanks, T.
dc.date.accessioned2025-01-27T20:41:50Z
dc.date.available2025-01-27T20:41:50Z
dc.date.issued2016
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractWe have applied the close binary system analysis program WINFITTER to an intensive study of Kepler-1 (= TrES-2) using all the available photometry (14 quarters; 1570640 measures) from the NASA Exoplanet Archive (NEA) at the Caltech website http://exoplanetarchive.ipac.caltech.edu. The mean individual data-point error of the normalized flux values is 0.00026, leading to the model's specification for the mean reference flux of the system to an accuracy of similar to 0.5 ppm. Completion of the analysis requires a number of prior quantities, relating mainly to the host star, that are adopted from relevant literature. Our new results tend broadly to confirm those of previous authors, though there are a number of significant differences. Specifically, the applied photometric fitting function is more precise than those used before on the full Kepler data-set. The more complete discussion of the interdependent role of errors, using MCMC sampling, allows greater confidence in the obtained parameters themselves as well as understanding or their likely errors. Our photometrically derived values for the mass and radius of Kepler-1b are 1.18 +/- 0.05 M-Jup and 1.21 +/- 0.05 R-Jup. The mass of this Safronov Class I planet is closer to published spectroscopic values than found from previous photometric analysis, which can be attributed to the improved fitting function. The analysis determines a definite photometric Doppler effect from the orbit, but this is not independent of the tidal ('ellipticity') effect, and the two are consistently combined in our fitting function. A corresponding rotation-related Rossiter effect was not detected, allowing an upper limit on the rotation speed of similar to 70 kms(-1). The proportion of light coming from the known companion star is resolved, but turns out rather less than that inferred from the results of direct measurement. The fitting function also predicts a small secondary minimum ('occultation'), when the light reflected by the planet is eclipsed. However, the occultation depth cannot be measured directly from the data to the relevant accuracy, and so models for the planet's atmospheric properties based on this will be compromised by other assumptions and approximations in the light curve's fitting function. Suggestions of secular trends for the variation of parameters are considered, but the evidence of the Kepler data is not yet very persuasive.
dc.description.sponsorshipTUBITAK (Scientific and Technological Research Council of Turkey) [113F353]
dc.description.sponsorshipIt is a pleasure to thank Prof. Osman Demircan and the colleagues in the Physics Department of COMU (Canakkale, Turkey) for their interest and support of this programme. The research has been supported by TUBITAK (Scientific and Technological Research Council of Turkey) under Grant No. 113F353. Additional help and encouragement for this work has come from the National Universiy of Singapore, particularly through Prof. Lim Tiong Wee of the Department of Statistics and Applied Probability. An unnamed reviewer gave useful comments, directing our attention to important additional recent literature on Kepler-1 that we had neglected.
dc.identifier.doi10.1007/s10509-016-2924-8
dc.identifier.issn0004-640X
dc.identifier.issn1572-946X
dc.identifier.issue10
dc.identifier.urihttps://doi.org/10.1007/s10509-016-2924-8
dc.identifier.urihttps://hdl.handle.net/20.500.12428/24248
dc.identifier.volume361
dc.identifier.wosWOS:000386360000025
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.language.isoen
dc.publisherSpringer
dc.relation.ispartofAstrophysics and Space Science
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectStars - binary
dc.subjectExoplanets
dc.subjectLight curve analysis
dc.titlePhotometric analysis of the system Kepler-1
dc.typeArticle

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