TESS 揭示的围绕亮 M 矮星 L 168-9 的热类地行星
地球与行星天体物理
2020-04-22 v1 太阳与恒星天体物理
摘要
我们报告在一颗亮 M1V 矮星 L 168-9（TOI-134）周围探测到一颗凌星超级地球大小行星（R=1.39±0.09 R_earth），其轨道周期为 1.4 天，该恒星位于 25.15±0.02 pc 处，视星等 V=11、K=7.1。宿主恒星在凌星系外行星巡天卫星（TESS）任务的第一扇区被观测，并为确认及行星质量测量进行了地基测光、视宁受限与高分辨率成像以及使用 HARPS 和 PFS 光谱仪的精密径向速度（PRV）观测跟进。结合 TESS 数据与 PRV 观测，我们发现 L168-9 b 的质量为 4.60±0.56 M_earth，因此体密度比地球大 1.74^{+0.44}_{-0.33} 倍。轨道偏心率小于 0.21（95% 置信度）。该行星是 TESS 任务科学目标——测量 50 颗小行星质量——的一级候选体，并且是未来大气表征最具观测可及性的类地行星之一。
引用
@article{arxiv.2001.09175,
title = {A hot terrestrial planet orbiting the bright M dwarf L 168-9 unveiled by TESS},
author = {N. Astudillo-Defru and R. Cloutier and S. X. Wang and J. Teske and R. Brahm and C. Hellier and G. Ricker and R. Vanderspek and D. Latham and S. Seager and J. N. Winn and J. M. Jenkins and K. A. Collins and K. G. Stassun and C. Ziegler and J. M. Almenara and D. R. Anderson and E. Artigau and X. Bonfils and F. Bouchy and C. Briceño and R. P. Butler and D. Charbonneau and D. M. Conti and J. Crane and I. J . M. Crossfield and M. Davies and X. Delfosse and R. F. Díaz and R. Doyon and D. Dragomir and J. D. Eastman and N. Espinoza and Z. Essack and F. Feng and P. Figueira and T. Forveille and T. Gan and A. Glidden and N. Guerrero and R. Hart and Th. Henning and E. P. Horch and G. Isopi and J. S. Jenkins and A. Jordán and J. F. Kielkopf and N. Law and C. Lovis and F. Mallia and A. W. Mann and J. R. de Medeiros and C. Melo and R. E. Mennickent and L. Mignon and F. Murgas and D. A. Nusdeo and F. Pepe and H. M. Relles and M. Rose and N. C. Santos and D. Ségransan and S. Shectman and A. Shporer and J. C. Smith and P. Torres and S. Udry and J. Villasenor and J . G. Winters and G. Zhou},
journal= {arXiv preprint arXiv:2001.09175},
year = {2020}
}
备注
14 pages, 8 figures, 3 tables. Accepted for publication in astronomy and Astrophysics