K2-137 b: an Earth-sized planet in a 4.3-h orbit around an M-dwarf-猫眼课题宝

DOI：

10.1093/mnras/stx2891

发表时间：

2017-07

期刊：

Monthly Notices of the Royal Astronomical Society

影响因子：

4.8

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

A. Smith;J. Cabrera;S. Csizmadia;F. Dai;D. Gandolfi;T. Hirano;J. Winn;S. Albrecht;R. Alonso;G. Antoniciello;O. Barrag'an;H. Deeg;P. Eigmuller;M. Endl;A. Erikson;M. Fridlund;A. Fukui;S. Grziwa;E. Guenther;A. Hatzes;D. Hidalgo;A. Howard;H. Isaacson;J. Korth;M. Kuzuhara;J. Livingston;N. Narita;D. Nespral;G. Nowak;E. Pallé;M. Patzold;C. Persson;E. Petigura;J. Prieto-Arranz;H. Rauer;I. Ribas;V. V. Eylen-V.

我们报告了在K2的第10次战役中发现的一颗凌日类地行星，它围绕着一颗M3矮星运行。K2-137 B仅需4.3小时就完成了一次轨道运行，这是已知行星中第二短的轨道周期，仅比KOI 1843.03长4分钟，后者也围绕着一颗M矮星运行。使用档案图像，自适应光学成像，径向速度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 R，铁的质量分数必须大于0.45，它围绕一颗质量为0.463 ± 0.052 M、半径为0.442 ± 0.044 R的星星运行。

We report the discovery in K2's Campaign 10 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 h, the second shortest orbital period of any known planet, just 4 min longer than that of KOI 1843.03, which also orbits an M-dwarf. Using a combination of archival images, adaptive optics imaging, radial velocity 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 R⊕, and which must have an iron mass fraction greater than 0.45, orbits a star of mass 0.463 ± 0.052 M⊙ and radius 0.442 ± 0.044 R⊙.

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

文献摘要

相似文献