K2-114b and K2-115b: Two Transiting Warm Jupiters

Journal Article · Wed Nov 01 04:00:00 EDT 2017 · The Astronomical Journal (Online)

DOI:https://doi.org/10.3847/1538-3881/AA8BB9· OSTI ID:22863014

Shporer, Avi ^[1]; Zhou, George; Vanderburg, Andrew ^[2]; Fulton, Benjamin J. ^[3]; Espinoza, Nestor ^[4]; Collins, Karen ^[5]; Ciardi, David ^[6]; Bayliss, Daniel; Bouchy, Francois ^[7]; Armstrong, James D. ^[8]; Bento, Joao ^[9]; Cochran, William D. ^[10]; Cameron, Andrew Collier ^[11]; Colón, Knicole ^[12]; Crossfield, Ian ^[13]; Dragomir, Diana ^[14]; others, and

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1. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125 (United States)
2. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
3. Institute for Astronomy, University of Hawaii, Honolulu, HI 96822 (United States)
4. Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago (Chile)
5. Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235 (United States)
6. NASA Exoplanet Science Institute/Caltech, Pasadena, CA (United States)
7. Observatoire Astronomique de l’Universit’e de Geneve, 51 ch. des Maillettes, 1290 Versoix (Switzerland)
8. University of Hawaii Institute for Astronomy 34 Ohia Ku Street, Pukalani, HI 96768 (United States)
9. Research School of Astronomy and Astrophysics, Mount Stromlo Observatory, Australian National University, Weston, ACT 2611 (Australia)
10. McDonald Observatory and Department of Astronomy, University of Texas, Austin, TX 78812 (United States)
11. Centre for Exoplanet Science, SUPA School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS (United Kingdom)
12. NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
13. Astronomy and Astrophysics Department, UC Santa Cruz, CA (United States)
14. Massachusetts Institute of Technology, Cambridge, MA 02139 (United States)

We report the first results from a search for transiting warm Jupiter exoplanets—gas giant planets receiving stellar irradiation below about 10{sup 8} erg s{sup −1} cm{sup −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{sub −0.22}{sup +0.23} M{sub J}, a radius of 0.942{sub −0.020}{sup +0.032} R{sub J}, and an orbital period of 11.4 days. K2-115b has a mass of 0.84{sub −0.20}{sup +0.18} M{sub J}, a radius of 1.115{sub −0.061}{sup +0.057} R{sub J}, 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 10{sup 8} erg s{sup −1} cm{sup −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.

• OSTI ID: 22863014
• Journal Information: The Astronomical Journal (Online), Journal Name: The Astronomical Journal (Online) Journal Issue: 5 Vol. 154; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
CORRELATIONS
MASS
PHOTOMETRY
PLANETS
STARS