EPIC 211391664b: A 32 M ⊕ Neptune-size Planet in a 10 Day Orbit Transiting an F8 Star

Barragán, O.; Grziwa, Sascha; Gandolfi, Davide; Fridlund, Malcolm; Endl, Michael; Deeg, H. J.; Cagigal, Manuel P.; Lanza, Antonino F.; Prada Moroni, Pier G.; Smith, Alexis M. S.; Korth, Judith; Bedell, Megan; Cabrera, Juan; Cochran, William D.; Cusano, Felice; Csizmadia, Szilard; Eigmüller, Philipp; Erikson, Anders; Guenther, Eike W.; Hatzes, Artie P.; Nespral, D.; Pätzold, Martin; Prieto-Arranz, J.; Rauer, Heike
Bibliographical reference

The Astronomical Journal, Volume 152, Issue 6, article id. 193, 9 pp. (2016).

Advertised on:
12
2016
Number of authors
24
IAC number of authors
3
Citations
26
Refereed citations
24
Description
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 ⊙, R ⋆ = {1.311}-0.048+0.083 R ⊙, and age of {5.2}-1.0+1.2 {Gyr}. We derive a planetary mass and radius of M p = 32.2 ± 8.1 M ⊕ and R p = {4.3}-0.2+0.3 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.
Type