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arXiv 2009.03398astro-ph.EP
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多行星系统HD 106315和GJ 9827的物理参数

Physical Parameters of the Multi-Planet Systems HD 106315 and GJ 9827

Molly R. Kosiarek, David A. Berardo, Ian J. M. Crossfield, Cesar Laguna, Caroline Piaulet, Joseph M. Akana Murphy, Steve B. Howell, Gregory W. Henry, Howard Isa… 展开作者

Molly R. Kosiarek, David A. Berardo, Ian J. M. Crossfield, Cesar Laguna, Caroline Piaulet, Joseph M. Akana Murphy, Steve B. Howell, Gregory W. Henry, Howard Isaacson, Benjamin Fulton, Lauren M. Weiss, Erik A. Petigura, Aida Behmard, Lea A. Hirsch, Johanna Teske, Jennifer A. Burt, Sean M. Mills, Ashley Chontos, Teo Mocnik, Andrew W. Howard, Michael Werner, John H. Livingston, Jessica Krick, Charles Beichman, Varoujan Gorjian, Laura Kreidberg, Caroline Morley, Jessie L. Christiansen, Farisa Y. Morales, Nicholas J. Scott, Jeffrey D. Crane, Sharon Xuesong Wang, Stephen A. Shectman, Lee J. Rosenthal, Samuel K. Grunblatt, Ryan A. Rubenzahl, Paul A. Dalba, Steven Giacalone, Chiara Dane Villanueva, Qingtian Liu, Fei Dai, Michelle L. Hill, Malena Rice, Stephen R. Kane, Andrew W. Mayo

摘要:

HD 106315和GJ 9827是两颗明亮的邻近恒星,拥有多个超级地球和亚海王星,这些恒星非常适合大气特征。我们通过斯皮策凌日改进了行星的星历表,通过透射光谱学实现了未来大气特征所需的准确凌日预测。通过与Keck/HIRES和Magellan/PFS进行的多年高节奏观测活动,我们改进了行星的质量测量,以期待HST透射光谱。对于GJ 9827,为了更准确地模拟恒星噪声对我们数据的影响,我们用钙II H&K线提供的高斯过程模拟了活动引起的径向速度信号。我们发现行星的质量为M $_b$ = $4.87\pm 0.37$ M $_\oplus$,M $_c$ = $1.92\pm 0.49$ M $_\oplus$,M $_d$ = $3.42\pm 0.62$ M $_\oplus$。对于HD 106315,我们发现这种活动-径向速度去相关是无效的,因为斑点的存在减少,并推测这可能也延伸到其他热恒星(T $_{\rm {eff}}>6200$ K)。我们发现行星质量为M $_b$ = $10.5\pm 3.1$ M $_\oplus$和M $_c$ = $12.0\pm 3.8$ M $_\oplus$。我们通过将它们的质量和半径与一系列内部模型进行比较,研究了所有行星的组成。GJ 9827 b和GJ 9827 c都符合类地岩石组成,GJ 9827 d和HD 106315 b都需要额外的挥发物,并符合适量的水或氢/氦,HD 106315 c符合10%的氢/氦围绕类地岩石和铁核心。

英文摘要:

HD 106315 and GJ 9827 are two bright, nearby stars that host multiple super-Earths and sub-Neptunes discovered by K2 that are well suited for atmospheric characterization. We refined the planets' ephemerides through Spitzer transits, enabling accurate transit prediction required for future atmospheric characterization through transmission spectroscopy. Through a multi-year high-cadence observing campaign with Keck/HIRES and Magellan/PFS, we improved the planets' mass measurements in anticipation of HST transmission spectroscopy. For GJ 9827, we modeled activity-induced radial velocity signals with a Gaussian process informed from the Calcium II H&K lines in order to more accurately model the effect of stellar noise on our data. We found planet masses of M$_b$=$4.87\pm 0.37$ M$_\oplus$, M$_c$=$1.92\pm 0.49$ M$_\oplus$, and M$_d$=$3.42\pm 0.62$ M$_\oplus$. For HD 106315, we found that such activity-radial velocity decorrelation was not effective due to the reduced presence of spots and speculate that this may extend to other hot stars as well (T$_{\rm {eff}}>6200$ K). We found planet masses of M$_b$=$10.5\pm 3.1$ M$_\oplus$ and M$_c$=$12.0\pm 3.8$ M$_\oplus$. We investigated all of the planets' compositions through comparing their masses and radii to a range of interior models. GJ 9827 b and GJ 9827 c are both consistent with an Earth-like rocky composition, GJ 9827 d and HD 106315 b both require additional volatiles and are consistent with moderate amounts of water or hydrogen/helium, and HD 106315 c is consistent with 10% hydrogen/helium surrounding an Earth-like rock and iron core.

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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