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arXiv 2412.04552astro-ph.EP
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非凌星热木星 HD 143105 b 的真实质量与大气成分

True mass and atmospheric composition of the non-transiting hot Jupiter HD 143105 b

Luke Finnerty, Yinzi Xin, Jerry W. Xuan, Julie Inglis, Michael P Fitzgerald, Shubh Agrawal, Ashley Baker, Geoffrey A. Blake, Benjamin Calvin, Sylvain Cetre, Jac… 展开作者

Luke Finnerty, Yinzi Xin, Jerry W. Xuan, Julie Inglis, Michael P Fitzgerald, Shubh Agrawal, Ashley Baker, Geoffrey A. Blake, Benjamin Calvin, Sylvain Cetre, Jacques-Robert Delorme, Greg Doppman, Daniel Echeverri, Katelyn Horstman, Chih-Chun Hsu, Nemanja Jovanovic, Joshua Liberman, Ronald A. López, Emily C. Martin, Dimitri Mawet, Evan Morris, Jacklyn Pezzato-Rovner, Jean-Baptiste Ruffio, Ben Sappey, Tobias Schofield, Andrew Skemer, Taylor Venenciano, J. Kent Wallace, Nicole L. Wallack, Jason J. Wang, Ji Wang

AI总结:

本研究利用 Keck/KPIC K 波段互相关观测首次探测非凌星热木星 HD 143105 b 的大气,测定其真实质量、轨道倾角及 H_2O、CO、C/O 与金属度,并确认其大气倾向无热逆温。

摘要:

我们展示了对非凌星热木星 HD 143105 b 的 Keck/KPIC 第二阶段 K 波段观测。利用互相关方法,我们首次探测到该行星大气,得到 K_p = 185^{+11}_{-13} km s^{-1},下合时间比此前发表的星历早 2.5 小时。反演得到的 K_p 值结合轨道周期、主星质量以及未探测到凌星的事实,给出轨道倾角 78°^{+2}_{-12} 和行星真实质量 1.23±0.10 M_J。尽管 HD 143105 b 的平衡温度处于非逆温与逆温大气之间的过渡区间,我们的分析强烈倾向于非逆温大气。反演分析表明,HD 143105 b 的大气在约 1 bar 以内无云,并以 H_2O 吸收为主(log H_2O_MMR = -3.9^{+0.8}_{-0.5}),仅对 CO 丰度给出上限(95% 置信度下 log CO_MMR < -3.7)。我们未对 Fe、Mg 或 ^13CO 的丰度给出约束。基于这些丰度,我们给出 HD 143105 b 碳氧比的上限:95% 置信度下 C/O < 0.2,并发现其大气金属度约为太阳的 0.1 倍。低金属度可能是缺乏热逆温的原因;在 HD 143105 b 的温度下,热逆温可能需要 TiO 和/或 VO 提供显著不透明度。凭借这些结果,HD 143105 b 加入了少数已探测到大气的非凌星热木星行列。

英文摘要:

We present Keck/KPIC phase II $K$-band observations of the non-transiting hot Jupiter HD 143105 b. Using a cross-correlation approach, we make the first detection of the planetary atmosphere at $K_p = 185^{+11}_{-13}\rm km\ s^{-1}$ and an inferior conjunction time 2.5 hours before the previously-published ephemeris. The retrieved $K_p$ value, in combination with orbital period, mass of the host star, and lack of transit detection, gives an orbital inclination of $78^{\circ+2}_{-12}$ and a true planet mass of 1.23$\pm0.10\rm\ M_J$. While the equilibrium temperature of HD 143105 b is in the transition regime between non-inverted and inverted atmospheres, our analysis strongly prefers a non-inverted atmosphere. Retrieval analysis indicates the atmosphere of HD 143105 b is cloud-free to approximately 1 bar and dominated by H$_2$O absorption ($\log \rm H_2O_{MMR} = -3.9^{+0.8}_{-0.5}$), placing only an upper limit on the CO abundance ($\log \rm CO_{MMR} < -3.7$ at 95% confidence). We place no constraints on the abundances of Fe, Mg, or $^{13}$CO. From these abundances, we place an upper limit on the carbon-to-oxygen ratio for HD 143105 b, $\rm C/O < 0.2$ at 95% confidence, and find the atmospheric metallicity is approximately $0.1\times$ solar. The low metallicity may be responsible for the lack of a thermal inversion, which at the temperature of HD 143105 b would likely require significant opacity from TiO and/or VO. With these results, HD 143105 b joins the small number of non-transiting hot Jupiters with detected atmospheres.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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