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arXiv 2107.05089astro-ph.EP
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SOPHIE搜寻北系外行星。XVIII:六个新的冷彗星,包括最偏心的系外行星轨道之一

The SOPHIE search for northern extrasolar planets. XVIII: Six new cold Jupiters, including one of the most eccentric exoplanet orbits

O. D. S. Demangeon, S. Dalal, G. Hébrard, B. Nsamba, F. Kiefer, J. D. Camacho, J. Sahlmann, L. Arnold, N. Astudillo-Defru, X. Bonfils, I. Boisse, F. Bouchy, V. … 展开作者

O. D. S. Demangeon, S. Dalal, G. Hébrard, B. Nsamba, F. Kiefer, J. D. Camacho, J. Sahlmann, L. Arnold, N. Astudillo-Defru, X. Bonfils, I. Boisse, F. Bouchy, V. Bourrier, T. Campante, X. Delfosse, M. Deleuil, R. F. Díaz, J. Faria, T. Forveille, N. Hara, N. Heidari, M. J. Hobson, T. Lopez, C. Moutou, J. Rey, A. Santerne, S. Sousa, N. C. Santos, P. A. Strøm, M. Tsantaki, S. Udry

摘要:

上下文由于它们的凌日概率很低,长周期行星作为一个种群,只能通过凌日调查进行部分探测。因此,径向速度测量可以发挥关键作用,特别是对于巨行星。冷激器引起的典型径向速度半振幅为10 m. s ^{-1},这完全在多个仪器的范围内,这些仪器已经运行了十多年。目的。我们利用索菲高分辨率光谱仪正在进行的径向速度调查,继续其前身埃洛迪开始的搜索,以进一步描述寒冷的木星人口。方法.分析了六颗明亮的类太阳恒星在长达15年的时间里的径向速度数据,我们试图探测和确认开普勒信号。结果我们宣布发现了六颗行星,每个系统一颗,最小质量在2.99-8.3 Mjup范围内,轨道周期在200天到10年之间。这些数据并没有提供足够的证据来支持这些系统中存在其他行星。对恒星活动指标的分析证实了探测到的信号的行星性质。结论.这六颗行星属于寒冷而巨大的木星群体,其中四颗居住在其偏心的尾巴上。在这方面,HD 80869 b是最偏心的轨道之一,偏心率为0.862^{+0.028}_{-0.018}。因此,这些行星可以帮助更好地限制气体巨星种群的迁移和演化过程。此外,最近的工作提出了小行星和冷行星之间的相关性,表明这些系统是寻找小内行星的好候选者。

英文摘要:

Context. Due to their low transit probability, the long-period planets are, as a population, only partially probed by transit surveys. Radial velocity surveys thus have a key role to play, in particular for giant planets. Cold Jupiters induce a typical radial velocity semi-amplitude of 10m.s^{-1}, which is well within the reach of multiple instruments that have now been in operation for more than a decade. Aims. We take advantage of the ongoing radial velocity survey with the sophie high-resolution spectrograph, which continues the search started by its predecessor elodie to further characterize the cold Jupiter population. Methods. Analyzing the radial velocity data from six bright solar-like stars taken over a period of up to 15 years, we attempt the detection and confirmation of Keplerian signals. Results. We announce the discovery of six planets, one per system, with minimum masses in the range 2.99-8.3 Mjup and orbital periods between 200 days and 10 years. The data do not provide enough evidence to support the presence of additional planets in any of these systems. The analysis of stellar activity indicators confirms the planetary nature of the detected signals. Conclusions. These six planets belong to the cold and massive Jupiter population, and four of them populate its eccentric tail. In this respect, HD 80869 b stands out as having one of the most eccentric orbits, with an eccentricity of 0.862^{+0.028}_{-0.018}. These planets can thus help to better constrain the migration and evolution processes at play in the gas giant population. Furthermore, recent works presenting the correlation between small planets and cold Jupiters indicate that these systems are good candidates to search for small inner planets.

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