KELT-10b: the first transiting exoplanet from the KELT-South survey - a hot sub-Jupiter transiting a V = 10.7 early G-star

Kuhn, Rudolf B. and Rodriguez, Joseph E. and Collins, Karen A. and Lund, Michael B. and Siverd, Robert J. and Colon, Knicole D. and Pepper, Joshua and Stassun, Keivan G. and Cargile, Phillip A. and James, David J. and Penev, Kaloyan and Zhou, George and Bayliss, Daniel and Tan, T. G. and Curtis, Ivan A. and Udry, Stephane and Segransan, Damien and Mawet, Dimitri and Dhital, Saurav and Soutter, Jack and Hart, Rhodes and Carter, Brad and Gaudi, B. Scott and Myers, Gordon and Beatty, Thomas G. and Eastman, Jason D. and Reichart, Daniel E. and Haislip, Joshua B. and Kielkopf, John and Bieryla, Allyson and Latham, David W. and Jensen, Eric L. N. and Oberst, Thomas E. and Stevens, Daniel J. (2016) KELT-10b: the first transiting exoplanet from the KELT-South survey - a hot sub-Jupiter transiting a V = 10.7 early G-star. Monthly Notices of the Royal Astronomical Society, 459 (4). pp. 4281-4298. ISSN 0035-8711

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We report the discovery of KELT-10b, the first transiting exoplanet discovered using the KELT-South telescope. KELT-10b is a highly inflated sub-Jupiter mass planet transiting a relatively bright V = 10.7 star (TYC 8378-64-1), with Teff = 5948±74 K, log g = 4.319 -0.030 to +0.020 and
[Fe/H] = 0.09 -0.10 to +0.11, an inferred mass M* = 1.112 -0.061 to +0.055 M⊙ and radius R* = 1.209 -0.038 to +0.047 R⊙. The planet has a radius Rp = 1.399 -0.049 to +0.069 RJ

and mass Mp = 0.679 -0.038 to +0.039 MJ.

The planet has an eccentricity consistent with zero and a semi-major axis a = 0.05250 -0.00097 to +0.00086 au. The best fitting linear ephemeris is T0 = 2457066.720 45±0.00027 BJDTDB and P = 4.1662739 ± 0.0000063 days. This planet joins a group of highly inflated transiting exoplanets with a radius larger and a mass less than that of Jupiter. The planet, which boasts deep transits of 1.4%, has a relatively high equilibrium temperature of
Teq = 1377 -23 to +28 K, assuming zero albedo and perfect heat redistribution. KELT-10b receives an estimated insolation of 0.817 -0.054 to +0.068 X10 to the 9 erg s-1 cm-2, which places it far above the insolation threshold above which hot Jupiters exhibit increasing amounts of radius inflation. Evolutionary analysis of the host star suggests that KELT-10b may not survive beyond the current subgiant phase, depending on the rate of in-spiral of the planet over the next few Gyr. The planet transits a relatively bright star and exhibits the third largest transit depth of all transiting exoplanets with V < 11 in the southern hemisphere, making it a promising candidate for future atmospheric characterization studies.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to Published version allowed due to publisher copyright policy.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 23 Mar 2017 02:54
Last Modified: 16 Aug 2017 04:44
Uncontrolled Keywords: planetary systems; KELT-10; photometric techniques; radial velocities; spectroscopic techniques
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1093/mnras/stw880

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