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 Sun masses, R*=1.311 (+0.083)(-0.048) Sun radii, and age of 5.2 +/- 1.1 Gyr. We derive a planetary mass and radius of Mp=32.2 ± 8.1 Earth masses and Rp=4.3 ± 0.3 Earth radii. 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.

K2-98b: A 32 M ⊕ NEPTUNE-SIZE PLANET IN A 10 DAY ORBIT TRANSITING AN F8 STAR

BARRAGÁN VILLANUEVA, OSCAR IGNACIO;GANDOLFI, Davide;
2016

Abstract

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 Sun masses, R*=1.311 (+0.083)(-0.048) Sun radii, and age of 5.2 +/- 1.1 Gyr. We derive a planetary mass and radius of Mp=32.2 ± 8.1 Earth masses and Rp=4.3 ± 0.3 Earth radii. 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.
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http://iopscience.iop.org/article/10.3847/0004-6256/152/6/193/meta
planets and satellites: detection; planets and satellites: individual K2-98b (EPIC 211391664b); stars: fundamental parameters; Astronomy and Astrophysics; Space and Planetary Science
Barragán, Oscar; Grziwa, Sascha; Gandolfi, Davide; Fridlund, Malcolm; Endl, Michael; Deeg, Hans J.; Cagigal, Manuel P.; Lanza, Antonino F.; Moroni, Pier G. Prada; 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, David; Pätzold, Martin; Prieto-Arranz, Jorge; Rauer, Heike
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/1619358
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