Two Planets Orbiting The Recently Formed Post-Common Envelope Binary NN Serpentis
dc.contributor.utaustinauthor | Winget, D. E. | en_US |
dc.contributor.utaustinauthor | Miller, G. F. | en_US |
dc.creator | Beuermann, K. | en_US |
dc.creator | Hessman, F. V. | en_US |
dc.creator | Dreizler, S. | en_US |
dc.creator | Marsh, T. R. | en_US |
dc.creator | Parsons, S. G. | en_US |
dc.creator | Winget, D. E. | en_US |
dc.creator | Miller, G. F. | en_US |
dc.creator | Schreiber, M. R. | en_US |
dc.creator | Kley, W. | en_US |
dc.creator | Dhillon, V. S. | en_US |
dc.creator | Littlefair, S. P. | en_US |
dc.creator | Copperwheat, C. M. | en_US |
dc.creator | Hermes, J. J. | en_US |
dc.date.accessioned | 2016-04-22T19:47:17Z | |
dc.date.available | 2016-04-22T19:47:17Z | |
dc.date.issued | 2010-10 | en |
dc.description.abstract | Planets orbiting post-common envelope binaries provide fundamental information on planet formation and evolution. We searched for such planets in NN Ser ab, an eclipsing short-period binary that shows long-term eclipse time variations. Using published, reanalysed, and new mid-eclipse times of NN Ser ab obtained between 1988 and 2010, we find excellent agreement with the light-travel-time effect produced by two additional bodies superposed on the linear ephemeris of the binary. Our multi-parameter fits accompanied by N-body simulations yield a best fit for the objects NN Ser (ab)c and d locked in the 2:1 mean motion resonance, with orbital periods P-c similar or equal to 15.5 yrs and P-d similar or equal to 7.7 yrs, masses M-c sin i(c) similar or equal to 6.9 M-Jup and M-d sin i(d) similar or equal to 2.2 M-Jup, and eccentricities e(c) similar or equal to 0 and e(d) similar or equal to 0.20. A secondary chi(2) minimum corresponds to an alternative solution with a period ratio of 5:2. We estimate that the progenitor binary consisted of an A star with similar or equal to 2 M-circle dot and the present M dwarf secondary at an orbital separation of similar to 1.5 AU. The survival of two planets through the common-envelope phase that created the present white dwarf requires fine tuning between the gravitational force and the drag force experienced by them in the expanding envelope. The alternative is a second-generation origin in a circumbinary disk created at the end of this phase. In that case, the planets would be extremely young with ages not exceeding the cooling age of the white dwarf of 10(6) yrs. | en_US |
dc.description.department | Astronomy | en_US |
dc.description.sponsorship | Alfried Krupp von Bohlen und Halbach Foundation, Essen 085.D-0541 | en_US |
dc.description.sponsorship | UK's STFC | en_US |
dc.description.sponsorship | FONDECYT 1061199 | en_US |
dc.description.sponsorship | Centre of Astrophysics Valparaiso | en_US |
dc.description.sponsorship | Norman Hackerman Advanced Research Program 003658-0255-2007 | en_US |
dc.identifier | doi:10.15781/T27V30 | |
dc.identifier.citation | Beuermann, Klaus, F. V. Hessman, S. Dreizler, T. R. Marsh, S. G. Parsons, Donald Earl Winget, G. F. Miller et al. >Two planets orbiting the recently formed post-common envelope binary NN Serpentis.> Astronomy & Astrophysics, Vol. 521 (Oct., 2010): L60. | en_US |
dc.identifier.doi | 10.1051/0004-6361/201015472 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/2152/34484 | |
dc.language.iso | English | en_US |
dc.relation.ispartofserial | Astronomy & Astrophysics | en_US |
dc.rights | Administrative 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.subject | binaries: eclipsing | en_US |
dc.subject | planetary systems | en_US |
dc.subject | stars: individual: nn ser | en_US |
dc.subject | novae | en_US |
dc.subject | cataclysmic variables | en_US |
dc.subject | planets and satellites: formation | en_US |
dc.subject | stars: | en_US |
dc.subject | evolution | en_US |
dc.subject | white-dwarf | en_US |
dc.subject | system | en_US |
dc.subject | companion | en_US |
dc.subject | mass | en_US |
dc.subject | ser | en_US |
dc.subject | astronomy & astrophysics | en_US |
dc.title | Two Planets Orbiting The Recently Formed Post-Common Envelope Binary NN Serpentis | en_US |
dc.type | Article | en_US |
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