arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0802.1731astro-ph
收藏

木星双星HD 154345 b

The Jupiter Twin HD 154345b

J. T. Wright, G. W. Marcy, R. P. Butler, S. S. Vogt, G. W. Henry, H. Isaacson, A. W. Howard

摘要:

我们宣布发现了一个木星的双胞胎,它围绕着附近(d = 18 pc)的稍微贫金属([Fe/H] = -0.1)的G8矮星HD 154345运行。这颗行星的最小质量为0.95木星质量,轨道为9.2年,半径为4.2天文单位。目前,该系统中存在其他行星的证据很少或根本没有,但还不能排除较小或外部行星的可能性。我们还检测到一个9年的活动周期,在这颗星的光度和色球发射。通过与其他周期性晚G矮星的比较,我们排除了作为径向速度变化源的活动周期。

英文摘要:

We announce the discovery of a twin of Jupiter orbiting the slightly metal-poor ([Fe/H] = -0.1) nearby (d = 18 pc) G8 dwarf HD 154345. This planet has a minimum mass of 0.95 Jupiter masses and a 9.2 year, circular orbit with radius 4.2 AU. There is currently little or no evidence for other planets in the system, but smaller or exterior planets cannot yet be ruled out. We also detect a ~ 9-year activity cycle in this star photometrically and in chromospheric emission. We rule out activity cycles as the source of the radial velocity variations by comparison with other cycling late-G dwarfs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑