TY - JOUR
T1 - THE K2-ESPRINT PROJECT. II. SPECTROSCOPIC FOLLOW-UP of THREE EXOPLANET SYSTEMS from CAMPAIGN 1 of K2
AU - Eylen, Vincent Van
AU - Nowak, Grzegorz
AU - Albrecht, Simon
AU - Palle, Enric
AU - Ribas, Ignasi
AU - Bruntt, Hans
AU - Perger, Manuel
AU - Gandolfi, Davide
AU - Hirano, Teriyuki
AU - Sanchis-Ojeda, Roberto
AU - Kiilerich, Amanda
AU - Prieto-Arranz, Jorge
AU - Badenas, Mariona
AU - Dai, Fei
AU - Deeg, Hans J.
AU - Guenther, Eike W.
AU - Montaés-Rodriguez, Pilar
AU - Narita, Norio
AU - Rogers, Leslie A.
AU - Béjar, Victor J.S.
AU - Shrotriya, Tushar S.
AU - Winn, Joshua N.
AU - Sebastian, Daniel
N1 - Publisher Copyright:
© 2016. The American Astronomical Society. All rights reserved..
PY - 2016/3/20
Y1 - 2016/3/20
N2 - We report on Doppler observations of three transiting planet candidates that were detected during Campaign 1 of the K2 mission. The Doppler observations were conducted with FIES, HARPS-N, and HARPS. We measure the mass of EPIC 201546283b, and provide constraints and upper limits for EPIC 201295312b and EPIC 201577035b. EPIC 201546283b is a warm Neptune orbiting its host star in 6.77 days and has a radius of and a mass of , which leads to a mean density of . EPIC 201295312b is smaller than Neptune with an orbital period of 5.66 days, a radius of , and we constrain the mass to be below at 95% confidence. We also find a long-term trend indicative of another body in the system. EPIC 201577035b, which was previously confirmed as the planet K2-10b, is smaller than Neptune, orbiting its host star in 19.3 days, with a radius of . We determine its mass to be , with a 95% confidence upper limit at , and a mean density of . These measurements join the relatively small collection of planets smaller than Neptune with measurements or constraints of the mean density. Our code for performing K2 photometry and detecting planetary transits is now publicly available.
AB - We report on Doppler observations of three transiting planet candidates that were detected during Campaign 1 of the K2 mission. The Doppler observations were conducted with FIES, HARPS-N, and HARPS. We measure the mass of EPIC 201546283b, and provide constraints and upper limits for EPIC 201295312b and EPIC 201577035b. EPIC 201546283b is a warm Neptune orbiting its host star in 6.77 days and has a radius of and a mass of , which leads to a mean density of . EPIC 201295312b is smaller than Neptune with an orbital period of 5.66 days, a radius of , and we constrain the mass to be below at 95% confidence. We also find a long-term trend indicative of another body in the system. EPIC 201577035b, which was previously confirmed as the planet K2-10b, is smaller than Neptune, orbiting its host star in 19.3 days, with a radius of . We determine its mass to be , with a 95% confidence upper limit at , and a mean density of . These measurements join the relatively small collection of planets smaller than Neptune with measurements or constraints of the mean density. Our code for performing K2 photometry and detecting planetary transits is now publicly available.
KW - planetary systems
KW - stars: fundamental parameters
KW - stars: individual (EPIC 201295312, EPIC 201546283, EPIC 201577035)
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U2 - 10.3847/0004-637X/820/1/56
DO - 10.3847/0004-637X/820/1/56
M3 - Article
AN - SCOPUS:84962318622
SN - 0004-637X
VL - 820
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 56
ER -