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 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 (MNRAS), 459 (4). pp. 4281-4298. ISSN 1365-2966

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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,logg = 4.319+0.020 and [Fe/H] = 0.09+0.11, an inferred mass M = 1.112+0.055 M −0.030 −0.10 ∗ −0.061 ⊙
and radius R = 1.209+0.047 R . The planet has a radius R = 1.399+0.069 R and ∗ −0.035 ⊙ p −0.049 J mass M = 0.679+0.039 M . The planet has an eccentricity consistent with zero p −0.038 J and a semi-major axis a = 0.05250+0.00086 AU. The best fitting linear ephemeris −0.00097 is T0 = 2457066.72045±0.00027 BJDTDB and P = 4.1662739±0.0000063 days. This planet joins a group of highly inflated transiting exoplanets with a radius much larger and a mass much less than those of Jupiter. The planet, which boasts deep transits of 1.4%, has a relatively high equilibrium temperature of T = 1377+28 K, assuming eq −23 zero albedo and perfect heat redistribution. KELT-10b receives an estimated insolation of 0.817+0.068 × 109 erg s−1 cm−2, which places it far above the insolation threshold −0.054 above which hot Jupiters exhibit increasing amounts of radius inflation. Evolutionary analysis of the host star suggests that KELT-10b is unlikely to survive beyond the current subgiant phase, due to a concomitant in-spiral of the planet over the next ∼1 Gyr. The planet transits a relatively bright star which is accessible to large telescopes 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: Published version made available under open access.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 04 Jul 2016 05:50
Last Modified: 10 Aug 2016 01:41
Uncontrolled Keywords: techniques: photometric; techniques: radial velocities; techniques: spectroscopic; stars: individual: KELT-10; planetary systems
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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