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arXiv 1707.04549astro-ph.EP
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K2-137 b:一颗地球大小的行星,绕M矮星运行4.3小时

K2-137 b: an Earth-sized planet in a 4.3-hour orbit around an M-dwarf

A. M. S. Smith, J. Cabrera, Sz. Csizmadia, F. Dai, D. Gandolfi, T. Hirano, J. N. Winn, S. Albrecht, R. Alonso, G. Antoniciello, O. Barragán, H. Deeg, Ph. Eigmül… 展开作者

A. M. S. Smith, J. Cabrera, Sz. Csizmadia, F. Dai, D. Gandolfi, T. Hirano, J. N. Winn, S. Albrecht, R. Alonso, G. Antoniciello, O. Barragán, H. Deeg, Ph. Eigmüller, M. Endl, A. Erikson, M. Fridlund, A. Fukui, S. Grziwa, E. W. Guenther, A. P. Hatzes, D. Hidalgo, A. W. Howard, H. Isaacson, J. Korth, M. Kuzuhara, J. Livingston, N. Narita, D. Nespral, G. Nowak, E. Palle, M. Pätzold, C. M. Persson, E. Petigura, J. Prieto-Arranz, H. Rauer, I. Ribas, V. Van Eylen

摘要:

我们报告在K2发现一颗凌日类地行星,它以超短周期轨道围绕一颗M3矮星运行。K2-137 b仅需4.3小时就完成了一次轨道运行,是所有已知行星中轨道周期第二短的,仅比KOI 1843.03长4分钟,后者也围绕M矮星运行。使用档案图像,AO成像,RV测量和光变曲线建模的组合,我们表明,没有合理的食二进制的情况下可以解释的K2光变曲线,从而确认系统的行星性质。这颗行星的半径为0.89 +/- 0.09地球半径,铁的质量分数必须大于0.45,它围绕一颗质量为0.463 +/- 0.052 Msol,半径为0.442 +/- 0.044 Rsol的恒星运行。

英文摘要:

We report the discovery from K2 of a transiting terrestrial planet in an ultra-short-period orbit around an M3-dwarf. K2-137 b completes an orbit in only 4.3 hours, the second-shortest orbital period of any known planet, just 4 minutes longer than that of KOI 1843.03, which also orbits an M-dwarf. Using a combination of archival images, AO imaging, RV measurements, and light curve modelling, we show that no plausible eclipsing binary scenario can explain the K2 light curve, and thus confirm the planetary nature of the system. The planet, whose radius we determine to be 0.89 +/- 0.09 Earth radii, and which must have a iron mass fraction greater than 0.45, orbits a star of mass 0.463 +/- 0.052 Msol and radius 0.442 +/- 0.044 Rsol.

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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