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

THE KEPLER-454 SYSTEM: A SMALL, NOT-ROCKY INNER PLANET, A JOVIAN WORLD, AND A DISTANT COMPANION
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KEPLER-454 系统:一颗小型、非岩石的内行星、一个木星世界和一个遥远的伙伴

DOI:
10.3847/0004-637x/816/2/95
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发表时间:
2015
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
W. Chaplin
W. Chaplin
中科院分区:
--
文献类型:
--
作者:
S. Gettel;D. Charbonneau;C. Dressing;L. Buchhave;X. Dumusque;A. Vanderburg;A. Bonomo;L. Malavolta;F. Pepe;A. Cameron;D. Latham;S. Udry;G. Marcy;H. Isaacson;A. Howard;G. Davies;V. S. Aguirre;H. Kjeldsen;T. Bedding;E. Lopez;L. Affer;R. Cosentino;P. Figueira;A. Fiorenzano;A. Harutyunyan;J. Johnson;M. López;C. Lovis;M. Mayor;G. Micela;E. Molinari;F. Motalebi;D. Phillips;G. Piotto;D. Queloz;K. Rice;D. Sasselov;D. Ségransan;A. Sozzetti;C. Watson;S. Basu;T. Campante;J. Christensen;S. Kawaler;T. Metcalfe;R. Handberg;M. Lund;M. Lundkvist;D. Huber;W. Chaplin

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开普勒-454(KOI-273)是一颗相对明亮(V = 11.69等)的类太阳星星,拥有一颗过境行星候选者,轨道为10.6天。根据光谱学,我们估计该恒星的温度为5687 ± 50 K,金属丰度为[m/H] = 0.32 ± 0.08,投影旋转速度为v sin i < 2.4 km s−1。我们将这些值与短节奏开普勒数据中的小行星地震频率研究相结合,估计恒星质量为1.028 − 0.03 + 0.04 M?半径为1.066 ± 0.012 R,年龄为5.25 - 1.39 + 1.41?Gyr.我们估计这颗10.6天行星的半径为2.37 ± 0.13 R <$。利用国家伽利略望远镜上的HARPS-N摄谱仪获得的63个径向速度观测值和凯克天文台的HIRES摄谱仪获得的36个观测值,我们测量出这颗行星的质量为6.8 ± 1.4 M <$。我们还发现了另外两个非凌日伴星,一个在524天的近圆形轨道上最小质量为4.46 ± 0.12 MJ的行星,以及一个周期>10年,质量>12.1 MJ的大质量伴星。12颗半径小于2.7 R <$的系外行星和精确的质量测量似乎分为两个群体,其中小于1.6 R <$的行星遵循类似地球的组成曲线,而较大的行星需要大量的挥发物。开普勒-454 b的密度为2.76 ± 0.73 g cm−3,位于这两个星群之间的质量跃迁附近,需要挥发物和/或H/He气体的存在。
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 ⊙ ?> , the radius to be 1.066 ± 0.012 R⊙, 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⊕. 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⊕. We also detect two additional non-transiting companions, a planet with a minimum mass of 4.46 ± 0.12 MJ in a nearly circular 524 day orbit and a massive companion with a period >10 years and mass >12.1 MJ. The 12 exoplanets with radii <2.7 R⊕ and precise mass measurements appear to fall into two populations, with those <1.6 R⊕ 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.
DOI: 10.1088/0004-637x/800/2/135
发表时间: 2014-12
期刊: The Astrophysical Journal
影响因子: --
作者:
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HARPS-N 重新审视 KEPLER-10 行星系统:炎热的岩石世界和固态海王星质量行星
DOI: 10.1088/0004-637x/789/2/154
发表时间: 2014
期刊: The Astrophysical Journal
影响因子: --
作者:
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通讯作者: Dumusque X