A HARPS RV search for planets around young nearby stars
A HARPS RV search for planets around young nearby stars
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DOI：
10.1051/0004-6361/201936038
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发表时间：
2019-12
影响因子：
6.5
通讯作者：
A. Grandjean;A. Lagrange;M. Keppler;N. Mignon;S. Borgniet;G. Chauvin;Stéphane Galland;S. Messina-S.-Mess
中科院分区：
文献类型：
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作者：
A. Grandjean;A. Lagrange;M. Keppler;N. Mignon;S. Borgniet;G. Chauvin;Stéphane Galland;S. Messina-S.-Mess
上下文年轻的邻近恒星是用径向速度（RV）和直接成像技术寻找行星的良好候选者。这反过来又允许计算所有分离的巨行星发生率。在年轻恒星周围进行RV搜索是一项挑战，因为它们通常比光谱类型相似的老恒星旋转得更快，并且在RV时间序列中表现出磁活动（斑点）或脉动的特征。有必要进行具体分析，以确定这一活动的特征，并可能对其进行纠正。目标。我们的目标是寻找年轻的附近恒星周围的行星，并估计巨行星（GP）的出现率长达1000天。方法.我们使用拉西拉天文台3.6米望远镜上的HARPS摄谱仪观测了89颗A-M年轻（<6亿年）恒星。我们使用我们的SAFIR（通过傅立叶光谱间径向速度分析的光谱数据）软件来计算RV和其他光谱观测值。然后，我们计算了这个样本的伴随发生率。结果我们确认了HD 177171、HD 181321和HD 186704的双星性质。我们报告了HIP 36985的一个近距离低质量伴星的探测。没有发现行星伴侣。我们基于83颗周期小于1000天的年轻恒星，得到了GP（<13 MJup）和BD（∈ [13;80] MJup）出现率的上限，分别为2−2+ 3%和1−1+ 3%。
Context. Young nearby stars are good candidates in the search for planets with both radial velocity (RV) and direct imaging techniques. This, in turn, allows for the computation of the giant planet occurrence rates at all separations. The RV search around young stars is a challenge as they are generally faster rotators than older stars of similar spectral types and they exhibit signatures of magnetic activity (spots) or pulsation in their RV time series. Specific analyses are necessary to characterize, and possibly correct for, this activity. Aims. Our aim is to search for planets around young nearby stars and to estimate the giant planet (GP) occurrence rates for periods up to 1000 days. Methods. We used the HARPS spectrograph on the 3.6 m telescope at La Silla Observatory to observe 89 A−M young (<600 Myr) stars. We used our SAFIR (Spectroscopic data via Analysis of the Fourier Interspectrum Radial velocities) software to compute the RV and other spectroscopic observables. Then, we computed the companion occurrence rates on this sample. Results. We confirm the binary nature of HD 177171, HD 181321 and HD 186704. We report the detection of a close low mass stellar companion for HIP 36985. No planetary companion was detected. We obtain upper limits on the GP (<13 MJup) and BD (∈ [13;80] MJup) occurrence rates based on 83 young stars for periods less than 1000 days, which are set, 2−2+3 and 1−1+3%.