Volume 577, May 2015
|Number of page(s)||6|
|Section||Planets and planetary systems|
|Published online||20 May 2015|
Detection of a planet in the sdB + M dwarf binary system 2M 1938+4603
Uniwersytet Pedagogiczny, Obserwatorium na Suhorze, ul. Podchorążych
2 Astronomical Observatory of the Jagiellonian University, ul.Orla 171, 30-244 Cracow, Poland
3 Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
4 INAF−Osservatorio Astronomico di Torino, Strada dell’Osservatorio 20, 10025 Pino Torinese, Italy
Received: 23 November 2014
Accepted: 23 March 2015
We analyze 37 months of Kepler photometry of 2M 1938+4603, a binary system with a pulsating hot subdwarf primary and an M-dwarf companion that shows strong reflection effect. We measured the eclipse timings from more than 16 000 primary and secondary eclipses and discovered a periodic variation in the timing signal that we ascribe to a third body in the system. We also discovered a significant long-term trend that may be an evolutionary effect or a hint of more bodies. Upon the assumption that the third body is orbiting in the same plane as the primary, we establish that it must be a Jupiter-mass object orbiting with a period of 416 days at a distance of 0.92 AU. This mass is the lowest among all tertiary components detected in similar systems.
Key words: asteroseismology / space vehicles / binaries: eclipsing / subdwarfs / stars: oscillations
© ESO, 2015
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.