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Published November 2017 | Submitted + Published
Journal Article Open

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

Abstract

We report the first results from a search for transiting warm Jupiter exoplanets—gas giant planets receiving stellar irradiation below about 108 erg s^(−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) M_J, a radius of 0.942^(+0.032)_(-0.020) R_J, and an orbital period of 11.4 days. K2-115b has a mass of 0.84^(+0.18)_(-0.20) M_J, a radius of 1.115^(+0.057)_(-0.061) R_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 10^8 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.

Additional Information

© 2017 The American Astronomical Society. Received 2017 June 23; revised 2017 September 3; accepted 2017 September 6; published 2017 October 2017. We are grateful to the anonymous referee for the meticulous reading of the manuscript and for providing detailed comments that helped improve this work. We are grateful to Josh Pepper for his help in coordinating our ground-based follow-up observations with the KELT follow-up network. B.J.F. acknowledges that this material is based upon work supported by the National Science Foundation Graduate Research Fellowship under grant No. 2014184874. A.V. is supported by the NSF Graduate Research Fellowship, grant No. DGE 1144152. D.D. acknowledges support provided by NASA through Hubble Fellowship grant HST-HF2-51372.001-A awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. A.C.C. acknowledges support from STFC consolidated grant number ST/M001296/1. This paper includes data collected by the K2 mission. Funding for the K2 mission is provided by the NASA Science Mission directorate. This work makes use of observations from the LCO network. Some of the data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. Facilities: Gemini:North (DSSI - , NIRI) - , K2 - , Keck:I (HIRES) - , Keck:II (NIRC2) - , LCO (SBIG - , Sinistro) - , Euler 1.2 m (CORALIE). -

Attached Files

Published - Shporer_2017_AJ_154_188.pdf

Submitted - 1708.07128.pdf

Submitted - EPIC_211418729b_and_EPIC_211442297b_Two_Transiting.pdf

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Additional details

Created:
August 19, 2023
Modified:
October 17, 2023