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首页> 外文期刊>The Astrophysical Journal. Supplement Series >Kepler-15b: A hot Jupiter enriched in heavy elements and the first Kepler mission planet confirmed with the Hobby-Eberly Telescope
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Kepler-15b: A hot Jupiter enriched in heavy elements and the first Kepler mission planet confirmed with the Hobby-Eberly Telescope

机译：开普勒15b：一个充满重元素的炽热木星，并由Hobby-Eberly望远镜确认了第一个开普勒任务行星

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We report the discovery of Kepler-15b (KOI-128), a new transiting exoplanet detected by NASA's Kepler mission. The transit signal with a period of 4.94days was detected in the quarter 1 (Q1) Kepler photometry. For the first time, we have used the High Resolution Spectrograph (HRS) at the Hobby-Eberly Telescope (HET) to determine the mass of a Kepler planet via precise radial velocity (RV) measurements. The 24 HET/HRS RVs and 6 additional measurements from the Fibre-fed chelle Spectrograph spectrograph at the Nordic Optical Telescope reveal a Doppler signal with the same period and phase as the transit ephemeris. We used one HET/HRS spectrum of Kepler-15 taken without the iodine cell to determine accurate stellar parameters. The host star is a metal-rich ([Fe/H]= 0.36 ± 0.07) G-type main-sequence star with T_(eff) = 5515 ± 124 K. The semi-amplitude K of the RV orbit is 78.7_(-9.5)~(+8.5)ms~(-1), which yields a planet mass of 0.66 ± 0.1 M _(Jup). The planet has a radius of 0.96 ± 0.06R _(Jup) and a mean bulk density of 0.9 ± 0.2 gcm~(-3). The radius of Kepler-15b is smaller than the majority of transiting planets with similar mass and irradiation level. This suggests that the planet is more enriched in heavy elements than most other transiting giant planets. For Kepler-15b we estimate a heavy element mass of 30-40 M _?.
机译：我们报告发现了开普勒15b（KOI-128）的发现，开普勒15b是美国宇航局开普勒任务探测到的一种新型过境系外行星。在第1季度（Q1）开普勒光度法中检测到周期为4.94天的过渡信号。我们首次使用Hobby-Eberly望远镜（HET）的高分辨率光谱仪（HRS）通过精确的径向速度（RV）测量来确定开普勒行星的质量。北欧光学望远镜提供的24枚HET / HRS RV和另外6幅纤维喂食的chelle光谱仪进行的测量显示了多普勒信号，其周期和相位与过渡星历相同。我们使用开普勒15的一个HET / HRS光谱（不含碘细胞）来确定准确的恒星参数。主星是富金属的（[Fe / H] = 0.36±0.07）G型主序列星，T_（eff）= 5515±124K。RV轨道的半振幅K为78.7_（ -9.5）〜（+8.5）ms〜（-1），则行星质量为0.66±0.1 M _（Jup）。该行星的半径为0.96±0.06R_（Jup），平均堆密度为0.9±0.2 gcm〜（-3）。开普勒15b的半径小于质量和辐照度相似的大多数过渡行星的半径。这表明该行星比其他大多数过境巨型行星更富含重元素。对于开普勒15b，我们估计重元素质量为30-40 M _。

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