The SOPHIE search for northern extrasolar planets XVIII. Six new cold Jupiters, including one of the most eccentric exoplanet orbits
The SOPHIE search for northern extrasolar planets XVIII. Six new cold Jupiters, including one of the most eccentric exoplanet orbits
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索菲号寻找北方系外行星 XVIII.
DOI：
10.1051/0004-6361/202141079
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发表时间：
2021
影响因子：
6.5
通讯作者：
Demangeon O
中科院分区：
文献类型：
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作者：
Demangeon O
由于它们的低过境概率，长周期行星作为一个群体，只有部分通过过境调查。因此，径向速度测量可以发挥关键作用，特别是对于巨行星。冷加速器引起典型的径向速度半振幅为10 m s−1，这完全在多台仪器的范围内，这些仪器已经运行了十多年。目的我们利用正在进行的SOPHIE高分辨率光谱仪径向速度调查，它继续了它的前身EPDIE开始的搜索，以进一步描述冷木星种群的特征。6颗明亮的类太阳恒星在长达15年的时间内拍摄，我们试图检测和确认开普勒信号。ResultsWe宣布发现6颗行星，每个系统一颗，最小质量在4.8-8.3Mjupand轨道周期在200天和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。恒星活动指标的分析证实了行星性质的检测signals.ConclusionsThese六颗行星属于寒冷和大规模的木星人口，其中四个人口的偏心尾巴。在这方面，HD 80869 B是最偏心的轨道之一，偏心率为。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。
ContextDue 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 10 m s−1, which is well within the reach of multiple instruments that have now been in operation for more than a decade.AimsWe 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.MethodsAnalyzing the radial velocity data from six bright solar-like stars taken over a period of up to 15 yr, we attempt the detection and confirmation of Keplerian signals.ResultsWe announce the discovery of six planets, one per system, with minimum masses in the range 4.8–8.3Mjupand orbital periods between 200 days and 10 yr. 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.ConclusionsThese 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 . 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.