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arXiv 2010.01993astro-ph.EP
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K2-111:一个有两颗行星处于近共振状态的古老系统

K2-111: an old system with two planets in near-resonance

A. Mortier, M. R. Zapatero Osorio, L. Malavolta, Y. Alibert, K. Rice, J. Lillo-Box, A. Vanderburg, M. Oshagh, L. Buchhave, V. Adibekyan, E. Delgado Mena, M. Lop… 展开作者

A. Mortier, M. R. Zapatero Osorio, L. Malavolta, Y. Alibert, K. Rice, J. Lillo-Box, A. Vanderburg, M. Oshagh, L. Buchhave, V. Adibekyan, E. Delgado Mena, M. Lopez-Morales, D. Charbonneau, S. G. Sousa, C. Lovis, L. Affer, C. Allende Prieto, S. C. C. Barros, S. Benatti, A. S. Bonomo, W. Boschin, F. Bouchy, A. Cabral, A. Collier Cameron, R. Cosentino, S. Cristiani, O. D. S. Demangeon, P. Di Marcantonio, V. D'Odorico, X. Dumusque, D. Ehrenreich, P. Figueira, A. Fiorenzano, A. Ghedina, J. I. González Hernández, J. Haldemann, A. Harutyunyan, R. D. Haywood, D. W. Latham, B. Lavie, G. Lo Curto, J. Maldonado, A. Manescau, C. J. A. P. Martins, M. Mayor, D. Mégevand, A. Mehner, G. Micela, P. Molaro, E. Molinari, N. J. Nunes, F. A. Pepe, E. Palle, D. Phillips, G. Piotto, M. Pinamonti, E. Poretti, M. Riva, R. Rebolo, N. C. Santos, D. Sasselov, A. Sozzetti, A. Suárez Mascareño, S. Udry, R. G. West, C. A. Watson, T. G. Wilson

摘要:

本文报告了K2-111行星系统的详细特征,包括K2、WASP和ASAS-SN测光以及HARPS-N和ESTERO的高分辨率光谱数据。宿主K2-111被证实是一颗温和演化的($\log g=4.17$)、贫铁([Fe/H] $=-0.46$)、但α增强([ $α$ /Fe] $=0.27$)、色球安静、非常古老的厚盘G2恒星。使用PyORBIT进行的全局拟合表明,凌日行星K2- 111 b的轨道周期为$P_b=5.3518\pm0.0004$ d,行星半径为$1.82^{+0.11}_{-0.09}$ R $_\oplus$,质量为$5.29^{+0.76}_{-0.77}$ M $_\oplus$,导致体积密度略低于地球。恒星的化学成分和行星的性质与K2- 111 b是一颗类地行星,其铁核质量分数低于地球。我们宣布在径向速度数据中存在第二个信号,我们将其归因于一颗非凌日行星K2- 111 c,其轨道周期为$15.6785\pm 0.0064$天,与凌日行星的平均运动共振接近3:1,最小行星质量为$11.3\pm1.1$ M $_\oplus$。当分别拟合时,这两个行星信号在HARPS-N和ESTERO数据中被独立地检测到。在这个共振系统中可能有更多的行星,但需要更好的采样数据来确认它们的存在和物理参数。

英文摘要:

This paper reports on the detailed characterisation of the K2-111 planetary system with K2, WASP, and ASAS-SN photometry as well as high-resolution spectroscopic data from HARPS-N and ESPRESSO. The host, K2-111, is confirmed to be a mildly evolved ($\log g=4.17$), iron-poor ([Fe/H]$=-0.46$), but alpha-enhanced ([$α$/Fe]$=0.27$), chromospherically quiet, very old thick disc G2 star. A global fit, performed by using PyORBIT shows that the transiting planet, K2-111b, orbits with a period $P_b=5.3518\pm0.0004$ d, and has a planet radius of $1.82^{+0.11}_{-0.09}$ R$_\oplus$ and a mass of $5.29^{+0.76}_{-0.77}$ M$_\oplus$, resulting in a bulk density slightly lower than that of the Earth. The stellar chemical composition and the planet properties are consistent with K2-111b being a terrestrial planet with an iron core mass fraction lower than the Earth. We announce the existence of a second signal in the radial velocity data that we attribute to a non-transiting planet, K2-111c, with an orbital period of $15.6785\pm 0.0064$ days, orbiting in near-3:1 mean-motion resonance with the transiting planet, and a minimum planet mass of $11.3\pm1.1$ M$_\oplus$. Both planet signals are independently detected in the HARPS-N and ESPRESSO data when fitted separately. There are potentially more planets in this resonant system, but more well-sampled data are required to confirm their presence and physical parameters.

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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