arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1012.1168astro-ph.EPastro-ph.SR
收藏

HARPS搜寻太阳系外行星:XXVIII。围绕M0矮星的两颗巨行星

The HARPS search for southern extra-solar planets: XXVIII. Two giant planets around M0 dwarfs

Thierry Forveille, Xavier Bonfils, Gaspare Lo Curto, Xavier Delfosse, Stephane Udry, Francois Bouchy, Christophe Lovis, Michel Mayor, Claire Moutou, Dominique N… 展开作者

Thierry Forveille, Xavier Bonfils, Gaspare Lo Curto, Xavier Delfosse, Stephane Udry, Francois Bouchy, Christophe Lovis, Michel Mayor, Claire Moutou, Dominique Naef, Francesco Pepe, Christian Perrier, Didier Queloz, Nuno Santos

摘要:

在M矮星周围发现的巨行星比在质量更大的恒星周围发现的少,行星特征对中心恒星质量的依赖是行星形成理论的一个重要观测诊断。为了改进这些统计数据,我们正在用ESO 3.6米望远镜上的HARPS摄谱仪监测附近M矮星的径向速度。在这里,我们提出了两个附近的M0矮星周围的巨行星的检测:行星,最小质量分别为5个木星质量和1个土星质量,轨道围绕Gl 676 A和HIP 12961。后者是通过径向速度监测发现的M矮星中质量最大的行星,但它被发现在早期的M矮星周围,与行星与恒星质量图的上包络线大致一致。HIP 12961([Fe/H]=-0.07)比平均太阳附近([Fe/H]=-0.17)稍微富含金属,而Gl 676 A([Fe/H]=0.18)则明显如此。因此,这两颗恒星一起加强了巨行星在更多富含金属的M矮星周围更频繁的增长趋势,并且在富含金属的恒星周围发现的5~木星质量的Gl 676 Ab与最大质量的行星优先形成于具有大凝聚质量的盘的预期一致。

英文摘要:

Fewer giants planets are found around M dwarfs than around more massive stars, and this dependence of planetary characteristics on the mass of the central star is an important observational diagnostic of planetary formation theories. In part to improve on those statistics, we are monitoring the radial velocities of nearby M dwarfs with the HARPS spectrograph on the ESO 3.6 m telescope. We present here the detection of giant planets around two nearby M0 dwarfs: planets, with minimum masses of respectively 5 Jupiter masses and 1 Saturn mass, orbit around Gl 676A and HIP 12961. The latter is, by over a factor of two, the most massive planet found by radial velocity monitoring of an M dwarf, but its being found around an early M-dwarf is in approximate line with the upper envelope of the planetary vs stellar mass diagram. HIP 12961 ([Fe/H]=-0.07) is slightly more metal-rich than the average solar neighborhood ([Fe/H]=-0.17), and Gl 676A ([Fe/H=0.18) significantly so. The two stars together therefore reinforce the growing trend for giant planets being more frequent around more metal-rich M dwarfs, and the 5~Jupiter mass Gl 676Ab being found around a metal-rich star is consistent with the expectation that the most massive planets preferentially form in disks with large condensate masses.

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。

↑