Journal
ASTRONOMY & ASTROPHYSICS
Volume 540, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201118105
Keywords
binaries: close; binaries: eclipsing; subdwarfs; stars: individual: NSVS14256825; stars: individual: HS0705+6700; planets and satellites: detection
Categories
Funding
- Alfried Krupp von Bohlen und Halbach Foundation
- Essen
- Robert Bosch Foundation
- Ministry of Education of the Czech Republic [MSM0021620860]
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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 M-Jup. 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 M-Jup, 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.
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