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

Shporer, Avi and Zhou, George and Fulton, Benjamin J. and Vanderburg, Andrew and Espinoza, Néstor and Collins, Karen and Ciardi, David and Bayliss, Daniel and Armstrong, James D. and Bento, Joao and Bouchy, François and Cochran, William D. and Cameron, Andrew Collier and Colón, Knicole and Crossfield, Ian and Dragomir, Diana and Howard, Andrew W. and Howell, Steve B. and Isaacson, Howard and Kielkopf, John F. and Murgas, Felipe and Sefako, Ramotholo and Sinukoff, Evan and Siverd, Robert and Udry, Stephane (2017) K2-114b and K2-115b: Two Transiting Warm Jupiters. Astronomical Journal, 154 (5). Art. No. 188. ISSN 1538-3881. doi:10.3847/1538-3881/aa8bb9.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Shporer, Avi0000-0002-1836-3120
Zhou, George0000-0002-4891-3517
Fulton, Benjamin J.0000-0003-3504-5316
Vanderburg, Andrew0000-0001-7246-5438
Espinoza, Néstor0000-0001-9513-1449
Collins, Karen0000-0001-6588-9574
Ciardi, David0000-0002-5741-3047
Bayliss, Daniel0000-0001-6023-1335
Cochran, William D.0000-0001-9662-3496
Colón, Knicole0000-0001-8020-7121
Crossfield, Ian0000-0002-1835-1891
Dragomir, Diana0000-0003-2313-467X
Howard, Andrew W.0000-0001-8638-0320
Howell, Steve B.0000-0002-2532-2853
Isaacson, Howard0000-0002-0531-1073
Sinukoff, Evan0000-0002-5658-0601
Siverd, Robert0000-0001-5016-3359
Alternate Title:EPIC 211418729b and EPIC 211442297b: Two Transiting Warm
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). -
Group:Astronomy Department
Funding AgencyGrant Number
NSF Graduate Research Fellowship2014184874
NSF Graduate Research FellowshipDGE-1144152
NASA Hubble FellowshipHST-HF2-51372.001-A
Science and Technology Facilities Council (STFC)ST/M001296/1
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:stars: individual (K2-114, EPIC 211418729, K2-115, EPIC 211442297, EPIC 212504617)
Issue or Number:5
Record Number:CaltechAUTHORS:20171019-083513673
Persistent URL:
Official Citation:Avi Shporer et al 2017 AJ 154 188
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:82478
Deposited By: Tony Diaz
Deposited On:19 Oct 2017 16:12
Last Modified:15 Nov 2021 19:50

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