K2-140b - An eccentric 6.57 d transiting hot Jupiter in Virgo

H. A.C. Giles, D. Bayliss, N. Espinoza, R. Brahm, S. Blanco-Cuaresma, A. Shporer, D. Armstrong, C. Lovis, S. Udry, F. Bouchy, M. Marmier, A. Jordán, J. Bento, A. Collier Cameron, R. Sefako, W. D. Cochran, F. Rojas, M. Rabus, J. S. Jenkins, M. JonesB. Pantoja, M. Soto, R. Jensen-Clem, D. A. Duev, M. Salama, R. Riddle, C. Baranec, N. M. Law

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16 Scopus citations


We present the discovery of K2-140b, a P = 6.57 d Jupiter-mass (MP = 1.019 ± 0.070MJup) planet transiting a V = 12.5 (G5-spectral type) star in an eccentric orbit (e = 0.120-0.046 +0.056) detected using a combination of K2 photometry and ground-based observations. With a radius of 1.095 ± 0.018 RJup, the planet has a bulk density of 0.726 ± 0.062 ρJup. The host star has a [Fe/H] of 0.12 ± 0.045, and from the K2 light curve, we find a rotation period for the star of 16.3 ± 0.1 d. This discovery is the 9th hot Jupiter from K2 and highlights K2's ability to detect transiting giant planets at periods slightly longer than traditional, ground-based surveys. This planet is slightly inflated, but much less than others with similar incident fluxes. These are of interest for investigating the inflation mechanism of hot Jupiters.

Original languageEnglish
Pages (from-to)1809-1818
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
StatePublished - 1 Apr 2018
Externally publishedYes


  • Planets and satellites: detection
  • Stars: individual: K2-140
  • Techniques: high angular resolution
  • Techniques: photometric
  • Techniques: radial velocities


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