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Title:
K2-237 b and K2-238 b: discovery and characterization of two new transiting hot Jupiters from K2
Authors:
Soto, M. G.; Díaz, M. R.; Jenkins, J. S.; Rojas, F.; Espinoza, N.; Brahm, R.; Drass, H.; Jones, M. I.; Rabus, M.; Hartman, J.; Sarkis, P.; Jordán, A.; Lachaume, R.; Pantoja, B.; Vuckovic, M.; Ciardi, D. R.; Crossfield, I.; Dressing, C.; Gonzales, E.; Hirsch, L.
Affiliation:
AA(Departamento de Astronomía, Universidad de Chile, Camino El Observatorio 1515, Las Condes, Santiago, Chile), AB(Departamento de Astronomía, Universidad de Chile, Camino El Observatorio 1515, Las Condes, Santiago, Chile), AC(Departamento de Astronomía, Universidad de Chile, Camino El Observatorio 1515, Las Condes, Santiago, Chile; Centro de Astrofísica y Tecnologías Afines (CATA), Casilla 36-D, Santiago, Chile), AD(Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile), AE(Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany), AF(Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile; Millennium Institute of Astrophysics, Santiago 7820436, Chile), AG(Millennium Institute of Astrophysics, Santiago 7820436, Chile; Center of Astro-Engineering UC, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile 0000-0002-7790-9971), AH(European Southern Observatory, Casilla 19001, Santiago, Chile), AI(Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile; Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany), AJ(Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA), AK(Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany), AL(Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile; Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany; Millennium Institute of Astrophysics, Santiago 7820436, Chile), AM(Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany; Center of Astro-Engineering UC, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile), AN(Departamento de Astronomía, Universidad de Chile, Camino El Observatorio 1515, Las Condes, Santiago, Chile), AO(Instituto de Física y Astronomía, Universidad de Vaparaíso, Casilla 5030, Valparaíso, Chile), AP(Caltech/IPAC-NASA Exoplanet Science Institute, Pasadena, CA 91125, USA), AQ(Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA), AR(Department of Astronomy, University of California, Berkeley, CA 94720, USA), AS(Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA), AT(Department of Astronomy, University of California, Berkeley, CA 94720, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 478, Issue 4, p.5356-5365 (MNRAS Homepage)
Publication Date:
08/2018
Origin:
OUP
Astronomy Keywords:
planets and satellites: detection, planets and satellites: fundamental parameters
Abstract Copyright:
2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/sty1334
Bibliographic Code:
2018MNRAS.478.5356S

Abstract

We report the discovery of two hot Jupiters orbiting the stars K2-237 and K2-238. We used photometric data from Campaigns 11 and 12 of the Kepler K2 mission and radial velocity data obtained using the HARPS, FEROS, and CORALIE spectrographs. K2-237 b and K2-238 b have masses of 1.60^{+0.11}_{-0.11} and 0.86^{+0.13}_{-0.12} M_Jup, radii of 1.65^{+0.07}_{-0.08} and 1.30^{+0.15}_{-0.14} R_Jup, and are orbiting their host stars in 2.18- and 3.20-d orbits, respectively. The large radius of K2-237 b leads us to conclude that this candidate corresponds to a highly inflated hot Jupiter. K2-238 b has a radius consistent with theoretical models, considering the high incident flux falling on the planet. We consider K2-237 b to be an excellent system for follow-up studies, since not only is it very inflated, but it also orbits a relatively bright star (V = 11.6).
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