期刊
ASTRONOMY & ASTROPHYSICS
卷 543, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201219391
关键词
planets and satellites: detection; binaries: close; binaries: eclipsing; subdwarfs; stars: individual: HW Virginis
资金
- Alfried Krupp von Bohlen und Halbach Foundation, Essen
We report new mid-eclipse times of the short-period sdB/dM binary HW Virginis, which differ substantially from the times predicted by a previous model. The proposed orbits of the two planets in that model are found to be unstable. We present a new secularly stable solution, which involves two companions orbiting HW Vir with periods of 12.7 yr and 55 +/- 15 yr. For orbits coplanar with the binary, the inner companion is a giant planet with mass M-3 sin i(3) similar or equal to 14 M-Jup and the outer one a brown dwarf or low-mass star with a mass of M-4 sin i(4) = 30-120 M-Jup. Using the mercury6 code, we find that such a system would be stable over more than 10(7) yr, in spite of the sizeable interaction. Our model fits the observed eclipse-time variations by the light-travel time effect alone, without invoking any additional process, and provides support for the planetary hypothesis of the eclipse-time variations in close binaries. The signature of non-Keplerian orbits may be visible in the data.
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