1. K2-98b: A 32 M Neptune-size Planet in a 10 Day Orbit Transiting an F8 Star
- Author
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Philipp Eigmüller, P. G. Prada Moroni, Manuel P. Cagigal, Judith Korth, Davide Gandolfi, Eike W. Guenther, Malcolm Fridlund, Martin Pätzold, Antonino F. Lanza, Michael Endl, Anders Erikson, Juan Cabrera, Heike Rauer, William D. Cochran, David Nespral, Alexis M. S. Smith, Szilard Csizmadia, Hans J. Deeg, Megan Bedell, Jorge Prieto-Arranz, Sascha Grziwa, Felice Cusano, Oscar Barragán, and Artie P. Hatzes
- Subjects
planets and satellites: detection ,Star (game theory) ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,Planet ,Neptune ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,planets and satellites: individual K2-98b (EPIC 211391664b) ,stars: fundamental parameters ,Astronomy and Astrophysics ,Space and Planetary Science ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Astrophysics::Galaxy Astrophysics ,Orbital elements ,Physics ,Earth and Planetary Astrophysics (astro-ph.EP) ,010308 nuclear & particles physics ,Radius ,Red-giant branch ,Orbit ,planets and satellites: detection | planets and satellites: individual: EPIC 211391664b | stars: fundamental parameters ,Astrophysics - Solar and Stellar Astrophysics ,13. Climate action ,Astrophysics::Earth and Planetary Astrophysics ,Planetary mass ,Astrophysics - Earth and Planetary Astrophysics - Abstract
We report the discovery of K2-98 b (EPIC 211391664 b), a transiting Neptune-sized planet monitored by the K2 mission during its campaign 5. We combine the K2 time-series data with ground-based photometric and spectroscopic follow-up observations to confirm the planetary nature of the object and derive its mass, radius, and orbital parameters. K2-98 b is a warm Neptune-like planet in a 10-day orbit around a V=12.2~mag F-type star with $M_\star$=$ 1.074\pm0.042$, $R_\star$=$ 1.311 ^{+ 0.083} _{ - 0.048} $, and age of $5.2_{-1.0}^{+1.2}$~Gyr. We derive a planetary mass and radius of $M_\mathrm{p}$=$ 32.2 \pm 8.1 $ and $R_\mathrm{p}$=$4.3^{+0.3}_{-0.2}$. K2-98 b joins the relatively small group of Neptune-sized planets whose both mass and radius have been derived with a precision better than 25 %. We estimate that the planet will be engulfed by its host star in $\sim$3~Gyr, due to the evolution of the latter towards the red giant branch., 11 pages, 4 figures, Accepted for publication in AJ
- Published
- 2016