Volume 540, April 2012
|Number of page(s)||5|
|Section||Stellar structure and evolution|
|Published online||14 March 2012|
The quest for companions to post-common envelope binaries
II. NSVS14256825 and HS0705+6700
1 Institut für Astrophysik, Georg-August-Universität, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
2 Westfalen-Kolleg, Rheinische Straße 67, 44137 Dortmund, Germany
3 Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Kraków, Poland
4 Max-Planck-Gymnasium, Theaterplatz 10, 37073 Göttingen, Germany
5 Vihorlat Observatory, Mierova 4, Humenne, Slovakia
6 Academy of Sciences, Fričova 298, 251 65 Ondřejov, Czech Republic
7 Warsaw University Astronomical Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
8 Astronomical Institute, Faculty of Math. and Physics, Charles University, 180 00 Praha 8, V Holešovičkách 2, Czech Republic
9 Los Alamos National Laboratory, MS D466, Los Alamos, NM 87545, USA
Received: 15 September 2011
Accepted: 16 January 2012
We report new mid-eclipse times of the two close binaries NSVS14256825 and HS0705+6700, harboring an sdB primary and a low-mass main-sequence secondary. Both objects display clear variations in their measured orbital period, which can be explained by the action of a third object orbiting the binary. If this interpretation is correct, the third object in NSVS14256825 is a giant planet with a mass of roughly 12 MJup. For HS0705+6700, we provide evidence that strengthens the case for the suggested periodic nature of the eclipse time variation and reduces the uncertainties in the parameters of the brown dwarf implied by that model. The derived period is 8.4 yr and the mass is 31 MJup, if the orbit is coplanar with the binary. This research is part of the PlanetFinders project, an ongoing collaboration between professional astronomers and student groups at high schools.
Key words: binaries: close / binaries: eclipsing / subdwarfs / stars: individual: NSVS14256825 / stars: individual: HS0705+6700 / planets and satellites: detection
© ESO, 2012
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