TOI-1231 b：一颗环绕邻近 M3 型矮星 NLTT 24399 的温带海王星大小行星
地球与行星天体物理
2021-08-11 v2
摘要
我们报告发现一颗环绕邻近（ = 27.5 pc）、M3V 型恒星 TOI-1231（NLTT 24399, L 248-27, 2MASS J10265947-5228099）的凌星、温带、海王星大小系外行星。该行星利用凌星系外行星巡天卫星的光度数据探测到，并由拉斯坎布雷斯天文台和南极凌星系外行星搜寻计划进行了后续观测。结合这些光度数据集，我们发现这颗新发现的行星半径为 3.65 R，轨道周期为 24.246 天。在麦哲伦 Clay 望远镜上用行星搜寻光谱仪获得的径向速度测量确认了行星的存在，并得出质量为 15.53.3 M。TOI-1231 b 的平衡温度仅为 330K，是迄今可用于大气研究的最冷小行星之一，其宿主恒星明亮的近红外亮度（J=8.88, K=8.07）使其成为 HST 和 JWST 令人兴奋的观测目标。未来的大气观测将通过同 K2-18 b 的比较，实现 250-350 K 温度区间首次比较行星学工作。此外，TOI-1231 的高系统径向速度（70.5 k\ms）可能允许通过多普勒频移将 H I Ly-alpha 恒星发射从地球气辉和 ISM 吸收特征中移开，从而探测从该行星逃逸的低速氢原子。
引用
@article{arxiv.2105.08077,
title = {TOI-1231 b: A Temperate, Neptune-Sized Planet Transiting the Nearby M3 Dwarf NLTT 24399},
author = {Jennifer A. Burt and Diana Dragomir and Paul Mollière and Allison Youngblood and Antonio García Muñoz and John McCann and Laura Kreidberg and Chelsea X. Huang and Karen A. Collins and Jason D. Eastman and Lyu Abe and Jose M. Almenara and Ian J. M. Crossfield and Carl Ziegler and Joseph E. Rodriguez and Eric E. Mamajek and Keivan G. Stassun and Samuel P. Halverson and Steven Jr. Villanueva and R. Paul Butler and Sharon Xuesong Wang and Richard P. Schwarz and George R. Ricker and Roland Vanderspek and David W. Latham and S. Seager and Joshua N. Winn and Jon M. Jenkins and Abdelkrim Agabi and Xavier Bonfils and David Ciardi and Marion Cointepas and Jeffrey D. Crane and Nicolas Crouzet and Georgina Dransfield and Fabo Feng and Elise Furlan and Tristan Guillot and Arvind F. Gupta and Steve B. Howell and Eric L. N. Jensen and Nicholas Law and Andrew W. Mann and Wenceslas Marie-Sainte and Rachel A. Matson and Elisabeth C. Matthews and Djamel Mékarnia and Joshua Pepper and Nic Scott and Stephen A. Shectman and Joshua E. Schlieder and François-Xavier Schmider and Daniel J. Stevens and Johanna K. Teske and Amaury H. M. J. Triaud and David Charbonneau and Zachory K. Berta-Thompson and Christopher J. Burke and Tansu Daylan and Thomas Barclay and Bill Wohler and C. E. Brasseur},
journal= {arXiv preprint arXiv:2105.08077},
year = {2021}
}
备注
20 pages, 9 figures. Accepted for publication in The Astronomical Journal