A Mass for the Extrasolar Planet Gliese 876b Determined from Hubble Space Telescope Fine Guidance Sensor 3 Astrometry and High-Precision Radial Velocities
A Mass for the Extrasolar Planet Gliese 876b Determined from Hubble Space Telescope Fine Guidance Sensor 3 Astrometry and High-Precision Radial Velocities
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通过哈勃太空望远镜精细制导传感器 3 天体测量和高精度径向速度确定太阳系外行星 Gliese 876b 的质量
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发表时间：
2002
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通讯作者：
M. Mayor
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作者：
G. Benedict;B. Mcarthur;T. Forveille;X. Delfosse;E. Nelan;R. P. Butler;W. Spiesman;G. Marcy;B. Goldman;C. Perrier;W. Jefferys;M. Mayor
我们报告的第一个天体测量确定质量的太阳系外行星，一个同伴以前发现多普勒光谱。径向速度首先提供了一个星历表，用于安排哈勃太空望远镜（HST）在伴星和远日星附近的观测。在这些轨道阶段的天体测量残差表现出系统的偏差一致的扰动，由于行星质量的同伴。结合HST天体测量与径向速度，我们解决了自行，视差，扰动的大小，倾角和位置角的节点线，而约束周期，速度振幅，经度的近星点，和偏心率的值从径向速度确定。我们得到一个扰动半长轴和倾角α = 0.25 ± 0.06mas，i = 84° ± 6°，绝对视差G1876，πabs = 214.6 ± 0.2mas。假设主星星星的质量为M* = 0.32 M，我们得到行星Gl 876 b的质量，Mb = 1.89 ± 0.34 MJup。
We report the first astrometrically determined mass of an extrasolar planet, a companion previously detected by Doppler spectroscopy. Radial velocities first provided an ephemeris with which to schedule a significant fraction of the Hubble Space Telescope (HST) observations near companion peri- and apastron. The astrometry residuals at these orbital phases exhibit a systematic deviation consistent with a perturbation due to a planetary mass companion. Combining HST astrometry with radial velocities, we solve for the proper motion, parallax, perturbation size, inclination, and position angle of the line of nodes, while constraining period, velocity amplitude, longitude of periastron, and eccentricity to values determined from radial velocities. We find a perturbation semimajor axis and inclination, α = 0.25 ± 0.06 mas, i = 84° ± 6°, and Gl 876 absolute parallax, πabs = 214.6 ± 0.2 mas. Assuming that the mass of the primary star is M* = 0.32 M☉, we find the mass of the planet, Gl 876b, Mb = 1.89 ± 0.34 MJup.