K2-137 b：一颗围绕M型矮星以4.3小时轨道运行的地球大小行星
地球与行星天体物理
2018-02-21 v2
摘要
我们报告了从K2任务发现的一颗环绕M3型矮星、处于超短周期轨道的凌星类地行星。K2-137 b仅用4.3小时完成一次轨道运行，是任何已知行星中第二短的轨道周期，仅比同样环绕一颗M型矮星运行的KOI 1843.03长4分钟。利用档案图像、自适应光学（AO）成像、视向速度（RV）测量和光变曲线建模的组合，我们表明没有任何合理的食双星情形能够解释K2光变曲线，从而确认了该系统的行星性质。该行星的半径我们确定为0.89 ± 0.09地球半径，且其铁质量分数必须大于0.45，它环绕一颗质量为0.463 ± 0.052 Msol、半径为0.442 ± 0.044 Rsol的恒星运行。
引用
@article{arxiv.1707.04549,
title = {K2-137 b: an Earth-sized planet in a 4.3-hour orbit around an M-dwarf},
author = {A. M. S. Smith and J. Cabrera and Sz. Csizmadia and F. Dai and D. Gandolfi and T. Hirano and J. N. Winn and S. Albrecht and R. Alonso and G. Antoniciello and O. Barragán and H. Deeg and Ph. Eigmüller and M. Endl and A. Erikson and M. Fridlund and A. Fukui and S. Grziwa and E. W. Guenther and A. P. Hatzes and D. Hidalgo and A. W. Howard and H. Isaacson and J. Korth and M. Kuzuhara and J. Livingston and N. Narita and D. Nespral and G. Nowak and E. Palle and M. Pätzold and C. M. Persson and E. Petigura and J. Prieto-Arranz and H. Rauer and I. Ribas and V. Van Eylen},
journal= {arXiv preprint arXiv:1707.04549},
year = {2018}
}
备注
12 pages, 9 figures, accepted for publication in MNRAS