KELT-1b: A STRONGLY IRRADIATED, HIGHLY INFLATED, SHORT PERIOD, 27 JUPITER-MASS COMPANION TRANSITING A MID-F STAR

We present the discovery of KELT-1b, the first transiting low-mass companion from the wide-field Kilodegree Extremely Little Telescope-North (KELT-North) transit survey. A joint analysis of the spectroscopic, radial velocity, and photometric data indicates that the V = 10.7 primary is a mildly evolv...

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Bibliographic Details
Published in:The Astrophysical journal 2012-12, Vol.761 (2), p.1-27
Main Authors: SIVERD, ROBERT J, Beatty, Thomas G, Pepper, Joshua, Eastman, Jason D, Collins, Karen, BIERYLA, ALLYSON, Latham, David W, Buchhave, Lars A, Jensen, Eric L N, CREPP, JUSTIN R
Format: Article
Language:English
Subjects:
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Brown dwarf stars
COMPARATIVE EVALUATIONS
DWARF STARS
Evolutionary
Extrasolar planets
Imaging
MASS
OPTICS
ORBITS
PHOTOMETRY
RADIAL VELOCITY
Red dwarf stars
Spectroscopy
SPIN
STELLAR ATMOSPHERES
SYNCHRONIZATION
TELESCOPES
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Summary:We present the discovery of KELT-1b, the first transiting low-mass companion from the wide-field Kilodegree Extremely Little Telescope-North (KELT-North) transit survey. A joint analysis of the spectroscopic, radial velocity, and photometric data indicates that the V = 10.7 primary is a mildly evolved mid-F star with T sub(eff) = 6516+ or -49 K, log g = 4.228 super(+0.014) sub(-0.021) , and [Fe/H] = 0.052+ or -0.079, with an inferred mass M sub(*) = 1.335 + or - 0.063 M sub([middot in circle]) and radius R sub(*) = 1.471 super(+0.045) sub(0.035) R sub([middot in circle]). The companion is a low-mass brown dwarf or a super-massive planet with mass M sub(p) = 27.38 + or - 0.93 M sub(Jup) and radius R sub(p) = 1.116 super(+0.038) sub(-0.029) R sub(Jup). Comparison with standard evolutionary models suggests that the radius of KELT-1b is likely to be significantly inflated. Adaptive optics imaging reveals a candidate stellar companion to KELT-1 with a separation of 588 + or - 1 mas, which is consistent with an M dwarf if it is at the same distance as the primary.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/761/2/123