一颗超级地球与亚海王星凌星晚型M矮星LP 791-18
地球与行星天体物理
2019-10-02 v1
摘要
行星在冷矮星周围出现得最为频繁，但已知绕行最晚型M星的特定例子寥寥无几。利用TESS测光，我们报告发现了两颗凌星低质量恒星LP 791-18(被TESS编号为TOI 736)的行星。该星光谱型为M6V，有效温度2960 K，半径0.17 R_Sun，是已知第三冷的可宿主行星的恒星。这两颗行星横跨较小系外行星中观察到的半径间隙；它们包括一颗轨道周期0.95天、半径1.1 R_Earth的行星，和一颗轨道周期5天、半径2.3 R_Earth的行星。由于宿主恒星较小，这些行星凌星时的光变损失相当大(0.4%和1.7%)。这使我们能够从地基测光中探测到两颗行星的凌星，并精化了它们的半径和轨道星历。未来，视向速度观测和透射光谱均可探测这些行星的整体内部与大气组成，而额外的测光监测将对更小的凌星行星敏感。
引用
@article{arxiv.1906.09267,
title = {A super-Earth and sub-Neptune transiting the late-type M dwarf LP 791-18},
author = {Ian J. M. Crossfield and William Waalkes and Elisabeth R. Newton and Norio Narita and Philip Muirhead and Kristo Ment and Elisabeth Matthews and Adam Kraus and Veselin Kostov and Molly R. Kosiarek and Stephen R. Kane and Howard Isaacson and Sam Halverson and Erica Gonzales and Mark Everett and Diana Dragomir and Karen A. Collins and Ashley Chontos and David Berardo and Jennifer G. Winters and Joshua N. Winn and Nicholas J. Scott and Barbara Rojas-Ayala and Aaron C. Rizzuto and Erik A. Petigura and Merrin Peterson and Teo Mocnik and Thomas Mikal-Evans and Nicholas Mehrle and Rachel Matson and Masayuki Kuzuhara and Jonathan Irwin and Daniel Huber and Chelsea Huang and Steve Howell and Andrew W. Howard and Teruyuki Hirano and Benjamin J. Fulton and Trent Dupuy and Courtney D. Dressing and Paul A. Dalba and David Charbonneau and Jennifer Burt and Zachory Berta-Thompson and Björn Benneke and Noriharu Watanabe and Joseph D. Twicken and Motohide Tamura and Joshua Schlieder and S. Seager and Mark E. Rose and George Ricker and Elisa Quintana and Sébastien Lépine and David W. Latham and Takayuki Kotani and Jon M. Jenkins and Yasunori Hori and Knicole Colon and Douglas A. Caldwell},
journal= {arXiv preprint arXiv:1906.09267},
year = {2019}
}
备注
20 pages, 7 figures, 2 tables, 2 planets, 1 cool star. Submitted to AAS Journals