K2-232 b: A transiting warm Saturn on an eccentric P = 11.2 d orbit around a V = 9.9 star

R. Brahm, N. Espinoza, A. Jordán, F. Rojas, P. Sarkis, M. R. Díaz, M. Rabus, H. Drass, R. Lachaume, M. G. Soto, J. S. Jenkins, M. I. Jones, Th Henning, B. Pantoja, M. Vučković

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

We report the discovery of K2-232 b using photometric data of the Kepler K2 satellite coupled with ground-based spectroscopic observations. K2-232 b has a mass of MP = 0.397 ± 0.037 MJ, a radius of RP = 1.00 ± 0.020 RJ, and a moderately low equilibrium temperature of Teq = 1030 ± 15K due to its relatively large star-planet separation of a = 0.1036 au. K2-232 b orbits its bright (V = 9.9) late F-type host star in an eccentric orbit (e = 0.258 ± 0.025) every 11.2 d, and is one of only four well-characterized warm Jupiters having host stars brighter than V = 10.We estimate a heavy element content of 20 ±7M for K2-232 b, which is consistent with standard models of giant planet formation. The bright host star of K2-232 b makes this system a well-suited target for detailed follow-up observations that will aid in the study of the atmospheres and orbital evolution of giant planets at moderate separations from their host stars.

Original languageEnglish
Pages (from-to)2572-2581
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume477
Issue number2
DOIs
StatePublished - 21 Jun 2018
Externally publishedYes

Keywords

  • Planetary systems

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