Directly Determined Properties of HD 97658 from Interferometric Observations
Directly Determined Properties of HD 97658 from Interferometric Observations
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DOI：
10.3847/1538-3881/ac141a
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发表时间：
2021-09-01
影响因子：
5.3
通讯作者：
Farrington, Christopher D.
中科院分区：
文献类型：
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作者：
Ellis, Tyler G.;Boyajian, Tabetha;Farrington, Christopher D.
我们使用凌日超级地球宿主 HD 97658 的 CHARA 阵列进行了干涉观测，并测量了其临边暗角直径为 theta(LD) = 0.314 +/- 0.004 mas。角直径与具有零点校正的 Gaia EDR3 视差值（pi = 46.412 +/- 0.022 mas，d =21.546 +/- 0.011 pc）的组合产生 R 星 = 0.728 +/- 0.008 R 圆点的物理半径。我们还测量了恒星的辐射热通量为 F-bol = 2.42 +/- 0.05 x 10(-8) erg s(-1) cm(-2)，与角大小一起，可以测量有效温度 T-eff = 5212 +/- 43 K。我们直接确定的恒星物理特性与之前通过光谱得出的估计非常一致。我们将测量结果与恒星演化模型和 HD 97658 b 凌日特性相结合，以确定 HD 97658 b 的质量和年龄，并限制行星的特性。我们的结果和对地球上 TESS 光变曲线 (TOI-1821) 的分析证实了之前对该系统的研究，具有更严格的不确定性。
We conducted interferometric observations with the CHARA Array of transiting super-Earth host HD 97658 and measured its limb-darkened angular diameter to be theta(LD) = 0.314 +/- 0.004 mas. The combination of the angular diameter with the Gaia EDR3 parallax value with zero-point correction (pi = 46.412 +/- 0.022 mas, d =21.546 +/- 0.011 pc) yields a physical radius of R-star = 0.728 +/- 0.008 R-circle dot. We also measured the bolometric flux of the star to be F-bol = 2.42 +/- 0.05 x 10(-8) erg s(-1) cm(-2), which, together with angular size, allows a measurement of the effective temperature T-eff = 5212 +/- 43 K. Our directly determined physical stellar properties are in good agreement with previous estimates derived from spectroscopy. We used our measurements in combination with stellar evolutionary models and properties of the transit of HD 97658 b to determine the mass and age of HD 97658 as well as constrain the properties of the planet. Our results and our analysis of the TESS light curve on the planet (TOI-1821) corroborate previous studies of this system with tighter uncertainties.