The Giant Planet Orbiting The Cataclysmic Binary DP Leonis

dc.contributor.utaustinauthorWinget, D. E.en_US
dc.contributor.utaustinauthorWinget, K. I.en_US
dc.creatorBeuermann, K.en_US
dc.creatorBuhlmann, J.en_US
dc.creatorDiese, J.en_US
dc.creatorDreizler, S.en_US
dc.creatorHessman, F. V.en_US
dc.creatorHusser, T. O.en_US
dc.creatorMiller, G. F.en_US
dc.creatorNickol, N.en_US
dc.creatorPons, R.en_US
dc.creatorRuhr, D.en_US
dc.creatorSchmulling, H.en_US
dc.creatorSchwope, A. D.en_US
dc.creatorSorge, T.en_US
dc.creatorUlrichs, L.en_US
dc.creatorWinget, D. E.en_US
dc.creatorWinget, K. I.en_US
dc.description.abstractPlanets orbiting post-common envelope binaries provide fundamental information on planet formation and evolution, especially for the yet nearly unexplored class of circumbinary planets. We searched for such planets in DP Leo, an eclipsing short-period binary, which shows long-term eclipse-time variations. Using published, reanalysed, and new mid-eclipse times of the white dwarf in DP Leo, obtained between 1979 and 2010, we find agreement with the light-travel-time effect produced by a third body in an elliptical orbit. In particular, the measured binary period in 2009/2010 and the implied radial velocity coincide with the values predicted for the motion of the binary and the third body around the common center of mass. The orbital period, semi-major axis, and eccentricity of the third body are P-c = 28.0 +/- 2.0 yrs, a(c) = 8.2 +/- 0.4 AU, and e(c) = 0.39 +/- 0.13. Its mass of sin i(c) M-c = 6.1 +/- 0.5 M-Jup qualifies it as a giant planet. It formed either as a first generation object in a protoplanetary disk around the original binary or as a second generation object in a disk formed in the common envelope shed by the progenitor of the white dwarf. Even a third generation origin in matter lost from the present accreting binary can not be entirely excluded. We searched for, but found no evidence for a fourth body.en_US
dc.description.sponsorshipAlfried Krupp von Bohlen und Halbach-Foundationen_US
dc.description.sponsorshipGeorg-August-Universität Göttingenen_US
dc.description.sponsorshipUniversity of Texas at Austinen_US
dc.description.sponsorshipSouth African Astronomical Observatoryen_US
dc.identifier.citationBeuermann, K., J. Buhlmann, J. Diese, S. Dreizler, F. V. Hessman, T-O. Husser, G. F. Miller et al. >The giant planet orbiting the cataclysmic binary DP Leonis.> Astronomy & Astrophysics, Vol. 526 (Feb., 2011): A53.en_US
dc.relation.ispartofserialAstronomy & Astrophysicsen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectplanets and satellites: detectionen_US
dc.subjectplanets and satellites: formationen_US
dc.subjectplanetary systemsen_US
dc.subjectnovae, cataclysmic variablesen_US
dc.subjectstars: individual: dpen_US
dc.subjectbinaries: eclipsingen_US
dc.subjectcircumbinary disksen_US
dc.subjectnn serpentisen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleThe Giant Planet Orbiting The Cataclysmic Binary DP Leonisen_US

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