期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 756, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/756/2/L39
关键词
binaries: visual; eclipses; planetary systems; stars: individual (HD 42176); techniques: photometric; techniques: radial velocities
资金
- NASA Grant [NNG04GO70G]
- NSF CAREER Grant [AST-1056524]
- National Science Foundation's PREST program [AST-0721386]
- Vanderbilt Office of the Provost through the Vanderbilt Initiative in Data-intensive Astrophysics
- National Science Foundation through PAARE Grant [AST-0849736]
- National Science Foundation through AAG Grant [AST-1009810]
- Kentucky Space Grant Consortium Graduate Fellowship
- Kepler Mission through NASA [NNX11AB99A]
- Smithsonian Astrophysical Observatory
- NASA [NNX11AB99A, 149453] Funding Source: Federal RePORTER
We report the discovery of KELT-2Ab, a hot Jupiter transiting the bright (V = 8.77) primary star of the HD 42176 binary system. The host is a slightly evolved late F-star likely in the very short-lived blue-hook stage of evolution, with T-eff = 6148 +/- 48 K, log g = 4.030(-0.026)(+0.015) and [Fe/H] = 0.034 +/- 0.78. The inferred stellar mass is M-* = 1.314(-0.060)(+0.063) M-circle dot and the star has a relatively large radius of R-* = 1.836(-0.046)(+0.066) R-circle dot. The planet is a typical hot Jupiter with period 4.1137913 +/- 0.00001 days and a mass of M-P = 1.524 +/- 0.088M(J) and radius of R-P = 1.290(-0.050)(+0.064) R-J. This is mildly inflated as compared to models of irradiated giant planets at the similar to 4 Gyr age of the system. KELT-2A is the third brightest star with a transiting planet identified by ground-based transit surveys, and the ninth brightest star overall with a transiting planet. KELT-2Ab's mass and radius are unique among the subset of planets with V < 9 host stars, and therefore increases the diversity of bright benchmark systems. We also measure the relative motion of KELT-2A and -2B over a baseline of 38 years, robustly demonstrating for the first time that the stars are bound. This allows us to infer that KELT-2B is an early K dwarf. We hypothesize that through the eccentric Kozai mechanism KELT-2B may have emplaced KELT-2Ab in its current orbit. This scenario is potentially testable with Rossiter-McLaughlin measurements, which should have an amplitude of similar to 44 m s(-1).
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