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

Title
THE KEPLER-454 SYSTEM: A SMALL, NOT-ROCKY INNER PLANET, A JOVIAN WORLD, AND A DISTANT COMPANION
Type
Article in International Scientific Journal
Year
2016
Authors
Gettel, S
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Charbonneau, D
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Dressing, CD
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Buchhave, LA
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Dumusque, X
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Vanderburg, A
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Bonomo, AS
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Malavolta, L
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Pepe, F
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Cameron, AC
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Latham, DW
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Udry, S
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Marcy, GW
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Isaacson, H
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Howard, AW
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Davies, GR
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Aguirre, VS
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Kjeldsen, H
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Bedding, TR
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Lopez, E
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Affer, L
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Cosentino, R
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Figueira, P
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Fiorenzano, AFM
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Harutyunyan, A
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Johnson, JA
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Lopez Morales, M
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Lovis, C
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Mayor, M
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Micela, G
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Molinari, E
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Motalebi, F
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Phillips, DF
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Piotto, G
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Queloz, D
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Rice, K
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Sasselov, D
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Segransan, D
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Sozzetti, A
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Watson, C
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Basu, S
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Campante, TL
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Christensen Dalsgaard, J
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Kawaler, SD
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Metcalfe, TS
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Handberg, R
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Lund, MN
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Lundkvist, MS
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Huber, D
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Chaplin, WJ
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Journal
Title: Astrophysical JournalImported from Authenticus Search for Journal Publications
Vol. 816
Final page: 95
ISSN: 0004-637X
Other information
Authenticus ID: P-00K-083
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
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