arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0810.1710astro-ph
收藏

一颗在0.6- AU轨道上围绕K0巨行星HD 102272的行星

A Planet in a 0.6-AU Orbit Around the K0 Giant HD 102272

A. Niedzielski, K. Go\' zdziewski, A. Wolszczan, M. Konacki, G. Nowak, P. Zieliński

摘要:

我们报告发现一个或多个行星质量的同伴,以K 0巨星HD 102272与霍比-埃伯利望远镜。在没有任何相关的观测周期与恒星活动的标准指标,观测到的径向速度变化最合理的解释是在开普勒运动的至少一个行星质量的身体周围的恒星。估计恒星质量为1.9 M $_\odot$,确认行星的最小质量为5.9 M $_J$。这颗行星的轨道特征是一个小但非零的离心率为$e$ =0.05,半长轴为0.61天文单位,这使它成为迄今为止在GK巨星周围发现的最紧凑的行星。这一发现增加了现有的证据,正如理论预测的那样,围绕中等质量巨星的行星轨道的最小尺寸受到行星形成过程和恒星演化的影响。目前关于HD 102272周围存在另一颗行星的证据不足以获得明确的双轨道解。

英文摘要:

We report the discovery of one or more planet-mass companions to the K0-giant HD 102272 with the Hobby-Eberly Telescope. In the absence of any correlation of the observed periodicities with the standard indicators of stellar activity, the observed radial velocity variations are most plausibly explained in terms of a Keplerian motion of at least one planet-mass body around the star. With the estimated stellar mass of 1.9M$_\odot$, the minimum mass of the confirmed planet is 5.9M$_J$. The planet's orbit is characterized by a small but nonzero eccentricity of $e$=0.05 and the semi-major axis of 0.61 AU, which makes it the most compact one discovered so far around GK-giants. This detection adds to the existing evidence that, as predicted by theory, the minimum size of planetary orbits around intermediate-mass giants is affected by both planet formation processes and stellar evolution. The currently available evidence for another planet around HD 102272 is insufficient to obtain an unambiguous two-orbit solution.

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。

↑