HD 715 b：一颗由TESS单次凌星发现的、围绕大质量亚巨星运行的暖木星
HD 715 b, a Warm Jupiter Orbiting a Massive Subgiant Discovered from a Single TESS Transit
浏览论文内容
中文总结 AI 辅助
本研究通过TESS单次凌星发现并确认了一颗围绕大质量亚巨星HD 715运行的暖木星HD 715 b，测量了其轨道周期、质量、半径和离心率，揭示了轨道离心率多样性。
中文摘要 AI 辅助
凌星暖木星围绕亮恒星运行的情况鲜为人知，但TESS任务已发现了大量此类行星。本文报告了一颗凌星暖木星的发现与确认，该行星围绕亮（V=8.70）亚巨星恒星HD 715（TOI-6893）运行。HD 715 b最初是在TESS第70扇区的单次凌星事件中识别出来的。我们利用PFS、TRES和MINERVA-Australis光谱仪获取了两个季节的视向速度跟踪观测，清晰地探测到了行星轨道。由于恒星质量$M_*=1.60\pm0.04 M_\odot$，HD 715因此成为已知拥有凌星暖木星的质量最大的恒星之一。通过对TESS凌星和视向速度数据的联合拟合，我们发现HD 715 b的轨道周期为$56.40^{+0.19}_{-0.23}$天，并测得精确的质量和半径分别为$0.635\pm0.056 M_J$和$1.07\pm0.04 R_J$，使其成为暖木星群体中相对典型的成员。其适中的轨道离心率$0.21^{+0.07}_{-0.08}$与其它围绕演化恒星运行的类似暖木星较高的离心率形成对比，表明轨道离心率的多样性比先前已知的更大。在TESS第42和43扇区的先前观测中未出现额外凌星，这使我们能够进一步将可能的轨道周期范围缩小至$[56.01, 56.35]$天。尽管星历表不确定性仍然很大，但未来的光度观测仍可能有助于恢复HD 715 b的凌星。
英文摘要
Transiting Warm Jupiters orbiting bright stars are scarcely known, but a substantial number of these planets have been uncovered by the TESS mission. In this work we report the discovery and confirmation of a transiting Warm Jupiter orbiting the bright ($V$ = 8.70) subgiant star HD 715 (TOI-6893). HD 715 b was originally identified from a single transit event in TESS Sector 70. We acquired two seasons of radial velocity follow-up using the PFS, TRES, and MINERVA-Australis spectrographs, which clearly detect the planetary orbit. At $M_*=1.60\pm0.04 M_\odot$, HD 715 thus becomes one of the most massive stars known to host a transiting Warm Jupiter. From a joint fit to the TESS transit and our RVs, we find that HD 715 b has a $56.40^{+0.19}_{-0.23}$ day orbital period and measure a precise mass and radius of $0.635\pm0.056 M_J$ and $1.07\pm0.04 R_J$, rendering it a relatively typical member of the Warm Jupiter population. The moderate orbital eccentricity of $0.21^{+0.07}_{-0.08}$ contrasts with the higher eccentricities of other similar Warm Jupiters orbiting evolved stars, indicating a greater diversity in orbital eccentricities than previously known. The absence of additional transits in preceding TESS observations in Sectors 42 and 43 allows us to further refine the range of possible orbital periods to $[56.01, 56.35]$ days. Though the ephemeris uncertainty remains substantial, future photometric observations may nonetheless allow for recovery of the transit of HD 715 b.
发表机构
- Max Planck Institute for Astronomy（马克斯·普朗克天文学研究所）
- Centre for Astrophysics, University of Southern Queensland（南昆士兰大学天体物理中心）
- Center for Astrophysics, Harvard & Smithsonian（哈佛-史密森尼天体物理中心）
- Department of Astronomy & Astrophysics, University of Chicago（芝加哥大学天文与天体物理系）
机构由 AI 辅助整理，请以论文原文为准。
