KELT-10b: the first transiting exoplanet from the KELT-South survey – a hot sub-Jupiter transiting a V= 10.7 early G-star
- Creators
- Kuhn, Rudolf B.
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Mawet, Dimitri
Abstract
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 T_(eff) = 5948 ± 74 K, log g = 4.319^(+0.020)_(−0.030) and [Fe/H] = 0.09^(+0.11)_(−0.10), an inferred mass M^* = 1.112^(+0.055)_(−0.061) M_⊙ and radius R^* = 1.209^(+0.047)_(−0.035) R_⊙. The planet has a radius Rp = 1.399^(+0.069)_(−0.049) RJ and mass Mp = 0.679^(+0.039)_(−0.038) MJ. The planet has an eccentricity consistent with zero and a semimajor axis a = 0.05250^(+0.00086)_(−0.00097) au. The best-fitting linear ephemeris is T_0 = 2457 066.720 45 ± 0.000 27 BJD_(TDB) and P = 4.166 2739 ± 0.000 0063 d. This planet joins a group of highly inflated transiting exoplanets with a larger radius and smaller mass than that of Jupiter. The planet, which boasts deep transits of 1.4 per cent, has a relatively high equilibrium temperature of T_(eq) = 1377^(+28)_(−23) K, assuming zero albedo and perfect heat redistribution. KELT-10b receives an estimated insolation of 0.817^(+0.068)_(−0.054) × 10^9 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.
Additional Information
© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 April 12. Received 2016 March 8; in original form 2015 September 8. KELT-South is hosted by the South African Astronomical Observatory and we are grateful for their ongoing support and assistance. KP acknowledges support from NASA grant NNX13AQ62G. Work by BSG and DJS was partially supported by NSF CAREER Grant AST-1056524. This research has made use of the Exoplanet Orbit Database and the Exoplanet Data Explorer at exoplanets.org (Han et al. 2014). This work has made use of NASA's Astrophysics Data System, the Extrasolar Planet Encyclopaedia at exoplanet.eu (Schneider et al. 2011), the SIMBAD data base (Wenger et al. 2000) operated at CDS, Strasbourg, France, and the VizieR catalogue access tool, CDS, Strasbourg, France (Ochsenbein, Bauer & Marcout 2000). This paper makes use of data and services from NASA Exoplanet Archive (Akeson et al. 2013), which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. This research has made use of TEPCat at http://www.astro.keele.ac.uk/jkt/tepcat/ (Southworth 2011). This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This research was made possible through the use of the AAVSO Photometric All-Sky Survey (APASS), funded by the Robert Martin Ayers Sciences Fund. This paper uses observations obtained with facilities of the Las Cumbres Observatory Global Telescope.Attached Files
Published - MNRAS-2016-Kuhn-4281-98.pdf
Submitted - 1509.02323v2.pdf
Supplemental Material - suppl_data.zip
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Additional details
- Eprint ID
- 70250
- Resolver ID
- CaltechAUTHORS:20160909-124312304
- NNX13AQ62G
- NASA
- AST-1056524
- NSF
- NASA/JPL/Caltech
- Robert Martin Ayers Sciences Fund
- Created
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2016-09-09Created from EPrint's datestamp field
- Updated
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2023-10-20Created from EPrint's last_modified field