Journal
ASTRONOMY & ASTROPHYSICS
Volume 577, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201425392
Keywords
asteroseismology; space vehicles; binaries: eclipsing; subdwarfs; stars: oscillations
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Funding
- National Science Center [UMO-2011/03/D/ST9/01914, 2012/07/B/ST9/04432]
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We analyze 37 months of Kepler photometry of 2M1938+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 0.92AU. This mass is the lowest among all tertiary components detected in similar systems.
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