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arXiv 2201.01553astro-ph.EPastro-ph.SR
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Coralie径向速度搜索演化恒星周围的伴星(CASCADES)III。一颗新的木星主星:使用TESS数据对HD 29399的深入分析

Coralie radial-velocity search for companions around evolved stars (CASCADES) III. A new Jupiter host-star: in-depth analysis of HD 29399 using TESS data

C. Pezzotti, G. Ottoni, G. Buldgen, A. Lyttle, P. Eggenberger, S. Udry, D. Ségransan, M. Mayor, C. Lovis, M. Marmier, A. Miglio, Y. Elsworth, G. R. Davies, W. H. Ball

摘要:

上下文增加探测到的系外行星的数量远非轶事,特别是对于需要长时间观测的长周期行星。更多的探测意味着更好地了解系外行星种群的统计特性,对其宿主恒星的详细建模也有助于深入讨论恒星-行星相互作用和行星系的轨道演变。目标。在发现一个新的行星系的背景下,我们的目标是通过径向速度测量,主恒星的地震特征和系统的轨道演化建模,对HD 29399及其伴星进行全面的研究。方法. HD 29399的高分辨率光谱是由安装在拉西拉天文台(智利)1.2米瑞士望远镜上的CORALIE摄谱仪获得的,作为CASCADES调查的一部分。我们使用的时刻的交叉关联函数的配置文件,以及光度变化的恒星作为诊断,以区分恒星和行星引起的信号。为了模拟主星,我们结合了全球和局部最小化方法和反演技术的正演模拟。我们还研究了系统在动力潮汐和平衡潮汐作用下的轨道历史。结果我们提出了一个长周期巨行星的检测。将这些测量与TESS的光度观测相结合,我们能够彻底模拟宿主恒星并研究系统的轨道演化。我们推导出恒星和行星的质量分别为$1.17 \pm 0.10~ M_{\odot}$和$1.59 \pm 0.08 ~M_{Jup}$,年龄为6.2 Gyr。我们表明,无论是动力学或平衡潮汐已经能够影响地球的轨道演变。此外,没有吞没的系统的未来演变的预测。

英文摘要:

Context. Increasing the number of detected exoplanets is far from anecdotal, especially for long-period planets that require a long duration of observation. More detections imply a better understanding of the statistical properties of exoplanet populations, and detailed modelling of their host stars also enables thorough discussions of star-planet interactions and orbital evolution of planetary systems. Aims. In the context of the discovery of a new planetary system, we aim to perform a complete study of HD 29399 and its companion by means of radial-velocity measurements, seismic characterisation of the host-star, and modelling of the orbital evolution of the system. Methods. High-resolution spectra of HD 29399 were acquired with the CORALIE spectrograph mounted on the 1.2- m Swiss telescope located at La Silla Observatory (Chile) as part of the CASCADES survey. We used the moments of the cross-correlation function profile as well as the photometric variability of the star as diagnostics to distinguish between stellar and planetary-induced signals. To model the host star we combined forward modelling with global and local minimisation approaches and inversion techniques. We also studied the orbital history of the system under the effects of both dynamical and equilibrium tides. Results. We present the detection of a long-period giant planet. Combining these measurements with photometric observations by TESS, we are able to thoroughly model the host star and study the orbital evolution of the system. We derive stellar and planetary masses of $1.17 \pm 0.10~ M_{\odot}$ and $1.59 \pm 0.08 ~M_{Jup}$, respectively, and an age for the system of 6.2 Gyr. We show that neither dynamical nor equilibrium tides have been able to affect the orbital evolution of the planet. Moreover, no engulfment is predicted for the future evolution of the system.

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