تقرير
The quest for companions to post-common envelope binaries: III. A reexamination of HW Virginis
| العنوان: | The quest for companions to post-common envelope binaries: III. A reexamination of HW Virginis |
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| المؤلفون: | Beuermann, K., Dreizler, S., Hessman, F. V., Deller, J. |
| سنة النشر: | 2012 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | We report new mid-eclipse times of the short-period sdB/dM binary HW Vir, 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 = 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, thereby providing 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. Comment: accepted by A&A |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1051/0004-6361/201219391 |
| الوصول الحر: | http://arxiv.org/abs/1206.3080Test |
| رقم الانضمام: | edsarx.1206.3080 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1051/0004-6361/201219391 |
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