2010A&A...521L..60B


Query : 2010A&A...521L..60B

2010A&A...521L..60B - Astronomy and Astrophysics, volume 521, L60-60 (2010/10-1)

Two planets orbiting the recently formed post-common envelope binary NN Serpentis.

BEUERMANN K., HESSMAN F.V., DREIZLER S., MARSH T.R., PARSONS S.G., WINGET D.E., MILLER G.F., SCHREIBER M.R., KLEY W., DHILLON V.S., LITTLEFAIR S.P., COPPERWHEAT C.M. and HERMES J.J.

Abstract (from CDS):

Planets orbiting post-common envelope binaries provide fundamental information on planet formation and evolution. We searched for such planets in NNSerab, an eclipsing short-period binary that shows long-term eclipse time variations. Using published, reanalysed, and new mid-eclipse times of NNSerab 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 NNSer(ab)c and d locked in the 2:1 mean motion resonance, with orbital periods Pc≃15.5yrs and Pd≃7.7yrs, masses Mcsinic≃6.9MJup and Mdsinid≃2.2MJup, and eccentricities ec≃0 and ed≃0.20. A secondary χ2 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 ∼2M and the present M dwarf secondary at an orbital separation of ∼1.5AU. 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 106yrs.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - planetary systems - stars: individual: NN Ser - novae - cataclysmic variables - planets and satellites: formation - stars: evolution

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* V471 Tau EB* 03 50 24.9666549840 +17 14 47.430910716   10.258 9.373   8.393 K2V+DA 639 0
2 BD-07 3477 HS* 12 44 20.2386233232 -08 40 16.846099536   10.46 10.594 10.895   sdB2VIIHe3 266 1
3 V* QS Vir EB* 13 49 52.0029035208 -13 13 37.000132212 14.27 14.98 14.40 14.37   DA3+dM 127 1
4 V* NN Ser CV* 15 52 56.1203524080 +12 54 44.429312196     16.51     DAO1+M4 254 0

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2022.08.17-14:55:35

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