期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 741, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/2041-8205/741/1/L1
关键词
binaries: general; planets and satellites: formation; stars: individual (Kepler-16 A, KIC 12644769); stars: low-mass; stars: rotation
资金
- NASA [NNX09AB33G]
- NSF [AST-1007992]
- W. M. Keck Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1009583] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1108595] Funding Source: National Science Foundation
- NASA [120925, NNX09AB33G] Funding Source: Federal RePORTER
Kepler-16 is an eccentric low-mass eclipsing binary with a circumbinary transiting planet. Here, we investigate the angular momentum of the primary star, based on Kepler photometry and Keck spectroscopy. The primary star's rotation period is 35.1 +/- 1.0 days, and its projected obliquity with respect to the stellar binary orbit is 1.degrees 6 +/- 2.degrees 4. Therefore, the three largest sources of angular momentum-the stellar orbit, the planetary orbit, and the primary's rotation-are all closely aligned. This finding supports a formation scenario involving accretion from a single disk. Alternatively, tides may have realigned the stars despite their relatively wide separation (0.2 AU), a hypothesis that is supported by the agreement between the measured rotation period and the pseudosynchronous period of tidal evolution theory. The rotation period, chromospheric activity level, and fractional light variations suggest a main-sequence age of 2-4 Gyr. Evolutionary models of low-mass stars can match the observed masses and radii of the primary and secondary stars to within about 3%.
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