THE KEPLER-454 SYSTEM: A SMALL, NOT-ROCKY INNER PLANET, A JOVIAN WORLD, AND A DISTANT COMPANION

• Type: Article in International Scientific Journal
• Date: 2016

Authors

Gettel, S (Author) Other; Charbonneau, D (Author) Other; Dressing, CD (Author) Other; Buchhave, LA (Author) Other; Dumusque, X (Author) Other; Vanderburg, A (Author) Other; Bonomo, AS (Author) Other; Malavolta, L (Author) Other; Pepe, F (Author) Other; Cameron, AC (Author) Other; Latham, DW (Author) Other; Udry, S (Author) Other; Marcy, GW (Author) Other; Isaacson, H (Author) Other; Howard, AW (Author) Other; Davies, GR (Author) Other; Aguirre, VS (Author) Other; Kjeldsen, H (Author) Other; Bedding, TR (Author) Other; Lopez, E (Author) Other; Affer, L (Author) Other; Cosentino, R (Author) Other; Figueira, P (Author) Other; Fiorenzano, AFM (Author) Other; Harutyunyan, A (Author) Other; Johnson, JA (Author) Other; Lopez Morales, M (Author) Other; Lovis, C (Author) Other; Mayor, M (Author) Other; Micela, G (Author) Other; Molinari, E (Author) Other; Motalebi, F (Author) Other; Phillips, DF (Author) Other; Piotto, G (Author) Other; Queloz, D (Author) Other; Rice, K (Author) Other; Sasselov, D (Author) Other; Segransan, D (Author) Other; Sozzetti, A (Author) Other; Watson, C (Author) Other; Basu, S (Author) Other; Campante, TL (Author) Other; Christensen Dalsgaard, J (Author) Other; Kawaler, SD (Author) Other; Metcalfe, TS (Author) Other; Handberg, R (Author) Other; Lund, MN (Author) Other; Lundkvist, MS (Author) Other; Huber, D (Author) Other; Chaplin, WJ (Author) Other

Journal

Title: Astrophysical Journal

Vol. 816

Final page: 95

ISSN: 0004-637X

Publisher: American Astronomical Society

Indexing

ISI Web of Knowledge - 27 Citations

Scopus - 3 Citations

Other information

Authenticus ID: P-00K-083

DOI: 10.3847/0004-637x/816/2/95

Abstract (EN): Kepler-454 (KOI-273) is a relatively bright (V = 11.69 mag), Sun-like star that hosts a transiting planet candidate in a 10.6 day orbit. From spectroscopy, we estimate the stellar temperature to be 5687 +/- 50 K, its metallicity to be [m/H] = 0.32 +/- 0.08, and the projected rotational velocity to be v sin i < 2.4 km s(-1). We combine these values with a study of the asteroseismic frequencies from short cadence Kepler data to estimate the stellar mass to be 1.028(-0.03)(+0.04)M(circle dot), the radius to be 1.066 +/- 0.012 R-circle dot, and the age to be 5.25(-1.39)(+1.41) Gyr. We estimate the radius of the 10.6 day planet as 2.37 +/- 0.13 R-circle plus. Using 63 radial velocity observations obtained with the HARPS-N spectrograph on the Telescopio Nazionale Galileo and 36 observations made with the HIRES spectrograph at the Keck Observatory, we measure the mass of this planet to be 6.8 +/- 1.4 M-circle plus. We also detect two additional nontransiting companions, a planet with a minimum mass of 4.46 +/- 0.12 M-J in a nearly circular 524 day orbit and a massive companion with a period >10 years and mass >12.1 M-J. The 12 exoplanets with radii <2.7 R-circle plus and precise mass measurements appear to fall into two populations, with those <1.6 R-circle plus following an Earth-like composition curve and larger planets requiring a significant fraction of volatiles. With a density of 2.76 +/- 0.73 g cm(-3), Kepler-454b lies near the mass transition between these two populations and requires the presence of volatiles and/or H/He gas.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13