THE K2-ESPRINT PROJECT. II. SPECTROSCOPIC FOLLOW-UP OF THREE EXOPLANET SYSTEMS FROM CAMPAIGN 1 OF K2
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Eylen-2016-THE K2-ESPRINT PROJE.pdf
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Author(s)
Nowak, Grzegorz
Albrecht, Simon
Palle, Enric
Ribas, Ignasi
Bruntt, Hans
Perger, Manuel
Gandolfi, Davide
Hirano, Teriyuki
Sanchis-Ojeda, Roberto
Kiilerich, Amanda
Date Issued
March 2016
Journal
Astrophysical Journal
Publisher
IOP Publishing
Citation
Eylen, Vincent Van, Grzegorz Nowak, Simon Albrecht, Enric Palle, Ignasi Ribas, Hans Bruntt, Manuel Perger, et al. “ THE K 2-ESPRINT PROJECT. II. SPECTROSCOPIC FOLLOW-UP OF THREE EXOPLANET SYSTEMS FROM CAMPAIGN 1 OF K 2 .” The Astrophysical Journal 820, no. 1 (March 17, 2016): 56. doi:10.3847/0004-637x/820/1/56.
Version
Final published version
Abstract
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 4.45[subscript -0.33][superscript +0.33]R[subscript ⊕] and a mass of 29.1[subscript -7.4][superscript +7.5]M[subscript ⊕], which leads to a mean density of 1.80[subscript -0.55][superscript +0.70]sg cm[superscript -3]. EPIC 201295312b is smaller than Neptune with an orbital period of 5.66 days, a radius of 2.75[subscript -0.22][superscript+0.24] R[subscript ⊕], and we constrain the mass to be below 12M[subscript ⊕] 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 3.84[subscript -0.34][subscript +0.35]R[subscript ⊕]. We determine its mass to be 27[subscript -16][superscript +17]M[subscript ⊕], with a 95% confidence upper limit at 57 M[subscript ⊕], and a mean density of 2.6[subscript -1.6][superscript +2.1]g cm[superscript -3]. 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.3847/0004-637x/820/1/56
