THEK2-ESPRINT PROJECT. II. SPECTROSCOPIC FOLLOW-UP OF THREE EXOPLANET SYSTEMS FROM CAMPAIGN 1 OFK2
| Autor: | Ignasi Ribas, Norio Narita, Mariona Badenas, Pilar Montañés-Rodríguez, Enric Palle, Víctor J. S. Béjar, Amanda Kiilerich, V. Van Eylen, Jorge Prieto-Arranz, Manuel Perger, Simon Albrecht, Teriyuki Hirano, Roberto Sanchis-Ojeda, Fei Dai, Daniel Sebastian, Leslie A. Rogers, Tushar S. Shrotriya, H. Bruntt, Joshua N. Winn, Eike W. Guenther, Davide Gandolfi, Grzegorz Nowak, Hans J. Deeg |
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| Rok vydání: | 2016 |
| Předmět: |
fundamental parameters [stars]
FOS: Physical sciences Astrophysics EPIC 201577035 EPIC stars: individual (EPIC 201295312 01 natural sciences Photometry (optics) Planet Neptune EPIC 201577035) 0103 physical sciences planetary systems 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Earth and Planetary Astrophysics (astro-ph.EP) Physics 010308 nuclear & particles physics individual: EPIC 201295312 [stars] Astronomy and Astrophysics Planetary system Orbital period Exoplanet Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science stars: fundamental parameters EPIC 201546283 stars: individual (EPIC 201295312 EPIC 201546283 EPIC 201577035) Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | Van Eylen, V, Nowak, G, Albrecht, S, Palle, E, Ribas, I, Bruntt, H, Perger, M, Gandolfi, D, Hirano, T, Sanchis-Ojeda, R, Kiilerich, A, Prieto-Arranz, J, Badenas, M, Dai, F, Deeg, H J, Guenther, E W, Montañés-Rodríguez, P, Narita, N, Rogers, L A, Bejar, V J S, Shrotriya, T S, Winn, J N & Sebastian, D 2016, ' The K2-ESPRINT Project. II. Spectroscopic Follow-up of Three Exoplanet Systems from Campaign 1 of K2 ', The Astrophysical Journal, vol. 820, no. 1 . https://doi.org/10.3847/0004-637X/820/1/56 |
| ISSN: | 1538-4357 |
| DOI: | 10.3847/0004-637x/820/1/56 |
| Popis: | 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 K2-27b (EPIC 201546283b), and provide constraints and upper limits for EPIC 201295312b and EPIC 201577035b. K2-27b is a warm Neptune orbiting its host star in 6.77 days and has a radius of $4.45^{+0.33}_{-0.33}~\mathrm{R_\oplus}$ and a mass of $29.1^{+7.5}_{-7.4}~\mathrm{M_\oplus}$, which leads to a mean density of $1.80^{+0.70}_{-0.55}~\mathrm{g~cm^{-3}}$. EPIC 201295312b is smaller than Neptune with an orbital period of 5.66 days, radius $2.75^{+0.24}_{-0.22}~\mathrm{R_\oplus}$ and we constrain the mass to be below $12~\mathrm{M_\oplus}$ at 95% confidence. We also find a long-term trend indicative of another body in the system. EPIC 201577035b, previously confirmed as the planet K2-10b, is smaller than Neptune orbiting its host star in 19.3 days, with radius $3.84^{+0.35}_{-0.34}~\mathrm{R_\oplus}$. We determine its mass to be $27^{+17}_{-16}~\mathrm{M_\oplus}$, with a 95% confidence uppler limit at $57~\mathrm{M_\oplus}$, and mean density $2.6^{+2.1}_{-1.6}~{\rm g~cm}^{-3}$. 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. Comment: Accepted for publication in ApJ |
| Databáze: | OpenAIRE |
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