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K2-98b: A 32 M ⊕ Neptune-Siza Planet in a 10 Day Orbit Transiting an F8 Star

Oscar Barragán ; Sascha Grziwa ; Davide Gandolfi ; Malcolm Fridlund (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; Michael Endl ; Hans J. Deeg ; Manuel P. Cagigal ; Antonino F. Lanza ; Pier G Prada Moroni ; Alexis M S Smith ; Judith Korth ; Megan Bedell ; Juan Cabrera ; William D. Cochran ; Felice Cusano ; Szilard Csizmadia ; Philipp Eigmüller ; Anders Erikson ; Eike W. Guenther ; Artie P. Hatzes ; David Nespral ; Martin Pätzold ; Jorge Prieto-Arranz ; Heike Rauer
Astronomical Journal (0004-6256). Vol. 152 (2016), 6, p. Art. no. 193.
[Artikel, refereegranskad vetenskaplig]

We report the discovery of K2-98b (EPIC 211391664b), a transiting Neptune-size 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. K2-98b is a warm Neptune-like planet in a 10 day orbit around a V = 12.2 mag F-type star with M ? = 1.074 ±0.042 M o, R ? = R o, and age of . We derive a planetary mass and radius of M p = 32.2 ±8.1 M ? and R p = R ?. K2-98b joins the relatively small group of Neptune-size planets whose 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 ?3 Gyr, due to the evolution of the latter toward the red giant branch.

Nyckelord: planets and satellites: detection; planets and satellites: individual K2-98b (EPIC 211391664b); stars: fundamental parameters

Denna post skapades 2017-01-27. Senast ändrad 2017-09-14.
CPL Pubid: 247789


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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik (2010-2017)


Astronomi, astrofysik och kosmologi

Chalmers infrastruktur