K2-287 b: An Eccentric Warm Saturn Transiting a G-dwarf
| Autor: | Thomas Henning, Daniel Bayliss, Avi Shporer, A. Zapata, Holger Drass, Z. Csubry, Vincent Suc, Néstor Espinoza, Matias I. Jones, Waqas Bhatti, James S. Jenkins, Blake Pantoja, M. Soto, Paula Sarkis, R. Lachaume, Felipe Rojas, Sergio Vásquez, David J. Osip, Víctor Moraga, Markus Rabus, Cristián E. Cortés, Matias Diaz, Maja Vučković, Andrés Jordán, Gáspár Á. Bakos, Rafael Brahm |
|---|---|
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | The Astronomical Journal |
| Popis: | We report the discovery of K2-287b, a Saturn mass planet orbiting a G-dwarf with a period of $P \approx 15$ days. First uncovered as a candidate using K2 campaign 15 data, follow-up photometry and spectroscopy were used to determine a mass of $M_P = 0.317 \pm 0.026$ $M_J$, radius $R_P = 0.833 \pm 0.013$ $R_J$, period $P = 14.893291 \pm 0.000025$ days and eccentricity $e = 0.476 \pm 0.026$. The host star is a metal-rich $V=11.410 \pm 0.129$ mag G dwarf for which we estimate a mass $M_* = 1.056$ $M_\odot$, radius $R_* = 1.07 \pm 0.01$ $R_\odot$, metallicity [Fe/H] = $0.20 \pm 0.05$ and $T_{eff} = 5673 \pm 75$ K. This warm eccentric planet with a time-averaged equilibrium temperature of $T_{eq} \approx 800$ K adds to the small sample of giant planets orbiting nearby stars whose structure is not expected to be affected by stellar irradiation. Follow-up studies on the K2-287 system could help in constraining theories of migration of planets in close-in orbits. Accepted in the Astronomical Journal. 9 figures, 3 tables |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|