SIMBAD references

2012A&A...543A.138B - Astronomy and Astrophysics, volume 543A, 138-138 (2012/7-1)

The quest for companions to post-common envelope binaries. III. A reexamination of HW Virginis.


Abstract (from CDS):

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 12.7yr and 55±15yr. For orbits coplanar with the binary, the inner companion is a giant planet with mass M3sini3≃14MJup and the outer one a brown dwarf or low-mass star with a mass of M4sini4= 30-120MJup. Using the mercury6 code, we find that such a system would be stable over more than 107yr, 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.

Abstract Copyright:

Journal keyword(s): planets and satellites: detection - binaries: close - binaries: eclipsing - subdwarfs - stars: individual: HW Virginis

Simbad objects: 11

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