K2-114b and K2-115b: two transiting warm Jupiters

Avi Shporer, George Zhou, Benjamin J. Fulton, Andrew Vanderburg, Nestor Espinoza, Karen Collins, David Ciardi, Daniel Bayliss, James D. Armstrong, Joao Bento, Francois Bouchy, William D. Cochran, Andrew Collier Cameron, Knicole Colón, Ian Crossfield, Diana Dragomir, Andrew W. Howard, Steve B. Howell, Howard Isaacson, John F. KielkopfFelipe Murgas, Ramotholo Sefako, Evan Sinukoff, Robert Siverd, Stephane Udry

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

We report the first results from a search for transiting warm Jupiter exoplanets—gas giant planets receiving stellar irradiation below about 108 erg−1 cm−2, equivalent to orbital periods beyond about 10 days around Sun-like stars. We have discovered two transiting warm Jupiter exoplanets initially identified as transiting candidates in K2 photometry. K2-114b has a mass of 1.85^(+0.23)_(-0.22) MJ, a radius of 0.942^(+0.032)_(-0.020) RJ, and an orbital period of 11.4 days. K2-115b has a mass of 0.84^(+0.18)_(-0.20) MJ, a radius of 1.115^(+0.057)_(-0.061) RJ, and an orbital period of 20.3 days. Both planets are among the longest-period transiting gas giant planets with a measured mass, and they are orbiting relatively old host stars. Both planets are not inflated, as their radii are consistent with theoretical expectations. Their position in the planet radius–stellar irradiation diagram is consistent with the scenario where the radius–irradiation correlation levels off below about 108 erg s−1 cm−2, suggesting that for warm Jupiters stellar irradiation does not play a significant role in determining the planet radius. We also report our identification of another K2 transiting warm Jupiter candidate, EPIC 212504617, as a false positive.

Original languageEnglish
Article number188
Number of pages11
JournalAstronomical Journal
Volume154
Issue number5
DOIs
Publication statusPublished - 20 Oct 2017

Keywords

  • Stars: individual: K2-114
  • EPIC 211418729
  • K2-115
  • EPIC 211442297
  • EPIC 212504617

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