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dc.contributor.authorvan Kerkwijk, Marten H.
dc.contributor.authorBreton, Rene P.
dc.contributor.authorJustham, Stephen
dc.contributor.authorPodsiadlowski, Philipp
dc.contributor.authorHan, Zhanwen
dc.contributor.authorRappaport, Saul A
dc.date.accessioned2015-03-04T20:15:42Z
dc.date.available2015-03-04T20:15:42Z
dc.date.issued2010-05
dc.date.submitted2010-01
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357
dc.identifier.urihttp://hdl.handle.net/1721.1/95823
dc.description.abstractAmong the initial results from Kepler were two striking light curves, for KOI 74 and KOI 81, in which the relative depths of the primary and secondary eclipses showed that the more compact, less luminous object was hotter than its stellar host. That result became particularly intriguing because a substellar mass had been derived for the secondary in KOI 74, which would make the high temperature challenging to explain; in KOI 81, the mass range for the companion was also reported to be consistent with a substellar object. We re-analyze the Kepler data and demonstrate that both companions are likely to be white dwarfs. We also find that the photometric data for KOI 74 show a modulation in brightness as the more luminous star orbits, due to Doppler boosting. The magnitude of the effect is sufficiently large that we can use it to infer a radial velocity amplitude accurate to 1 km s[superscript -1]. As far as we are aware, this is the first time a radial-velocity curve has been measured photometrically. Combining our velocity amplitude with the inclination and primary mass derived from the eclipses and primary spectral type, we infer a secondary mass of 0.22 ± 0.03 M ☉. We use our estimates to consider the likely evolutionary paths and mass-transfer episodes of these binary systems.en_US
dc.language.isoen_US
dc.publisherInstitute of Physics/American Astronomical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1088/0004-637x/715/1/51en_US
dc.rightsArticle 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.en_US
dc.sourceAmerican Astronomical Societyen_US
dc.titleOBSERVATIONS OF DOPPLER BOOSTING IN KEPLER LIGHT CURVESen_US
dc.typeArticleen_US
dc.identifier.citationVan Kerkwijk, Marten H., Saul A. Rappaport, René P. Breton, Stephen Justham, Philipp Podsiadlowski, and Zhanwen Han. “OBSERVATIONS OF DOPPLER BOOSTING IN KEPLER LIGHT CURVES.” The Astrophysical Journal 715, no. 1 (April 23, 2010): 51–58. © 2010 American Astronomical Society.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Physicsen_US
dc.contributor.departmentMIT Kavli Institute for Astrophysics and Space Researchen_US
dc.contributor.mitauthorRappaport, Saul A.en_US
dc.relation.journalAstrophysical Journalen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsvan Kerkwijk, Marten H.; Rappaport, Saul A.; Breton, René P.; Justham, Stephen; Podsiadlowski, Philipp; Han, Zhanwenen_US
dc.identifier.orcidhttps://orcid.org/0000-0003-3182-5569
mit.licensePUBLISHER_POLICYen_US


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