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

Rudolf B. Kuhn, Joseph E. Rodriguez, Karen A. Collins, Michael B. Lund, Robert J. Siverd, Knicole D. Colón, Joshua Pepper, Keivan G. Stassun, Phillip A. Cargile, David J. James, Kaloyan Penev, George Zhou, Daniel Bayliss, T. G. Tan, Ivan A. Curtis, Stephane Udry, Damien Segransan, Dimitri Mawet, Saurav Dhital, Jack SoutterRhodes Hart, Brad Carter, B. Scott Gaudi, Gordon Myers, Thomas G. Beatty, Jason D. Eastman, Daniel E. Reichart, Joshua B. Haislip, John Kielkopf, Allyson Bieryla, David W. Latham, Eric L.N. Jensen, Thomas E. Oberst, Daniel J. Stevens

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


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 +0.020 and [Fe/H] = 0.09-0.10 +0.11, an inferred mass M* = 1.112-0.061+0.055 M and radius R* = 1.209-0.035 +0.047 R. The planet has a radius Rp = 1.399-0.049 +0.069 RJ and mass Mp = 0.679-0.038 +0.039 MJ. The planet has an eccentricity consistent with zero and a semimajor axis a = 0.052 50-0.000 97 +0.000 86 au. The best-fitting linear ephemeris is T0 = 2457 066.720 45 ± 0.000 27 BJDTDB 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 Teq = 1377-23 +28 K, assuming zero albedo and perfect heat redistribution. KELT-10b receives an estimated insolation of 0.817-0.054 +0.068 × 109 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.

Original languageEnglish (US)
Pages (from-to)4281-4298
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - Jul 11 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.


  • Planetary systems
  • Stars: individual: KELT-10
  • Techniques: photometric
  • Techniques: radial velocities
  • Techniques: spectroscopic


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