一颗亚海王星凌星年轻场星 HD 18599（距离 40 pc）
地球与行星天体物理
2023-04-05 v1
摘要
围绕年轻近邻恒星运行的凌星系外行星是检验行星形成与演化理论的理想实验室。然而，迄今为止仅发现少数年龄小于 1 Gyr 的恒星拥有凌星系外行星。本文报道在 HD 18599（一颗年轻的（300 Myr）、近邻的（d=40 pc）K 型恒星）周围发现并证认一颗亚海王星。我们利用来自 TESS、Spitzer 和 Gaia 任务的数据，来自 IRSF、LCO、PEST 和 NGTS 的地面测光，来自 Gemini 的散斑成像，以及来自 CHIRON、NRES、FEROS 和 Minerva-Australis 的光谱，将该凌星行星候选体证认为一颗真实的行星。该行星轨道周期为 4.13 d，半径为 2.7Rearth。视向速度（RV）数据给出了 30.5Mearth 的 3-sigma 质量上限，这可由一个高质量伴星或年轻恒星典型的大观测抖动来解释。宿主星的亮度（V~9 mag）使其利于通过多普勒质量测量进行详细表征，从而提供对年轻行星内部结构的罕见观测。
引用
@article{arxiv.2210.08179,
title = {A sub-Neptune transiting the young field star HD 18599 at 40 pc},
author = {Jerome P. de Leon and John H. Livingston and James S. Jenkins and Jose I. Vines and Robert A. Wittenmyer and Jake T. Clark and Joshua I. M. Winn and Brett Addison and Sarah Ballard and Daniel Bayliss and Charles Beichman and Björn Benneke and David Anthony Berardo and Brendan P. Bowler and Tim Brown and Edward M. Bryant and Jessie Christiansen and David Ciardi and Karen A. Collins and Kevin I. Collins and Ian Crossfield and Drake Deming and Diana Dragomir and Courtney D. Dressing and Akihiko Fukui and Tianjun Gan and Steven Giacalone and Samuel Gill and Erica Gonz\' alez Alvarez and Katharine Hesse and Jonathan Horner and Steve B. Howell and Jon M. Jenkins and Stephen R. Kane and Alicia Kendall and John F. Kielkopf and Laura Kreidberg and David W. Latham and Huigen Liu and Michael B. Lund and Rachel Matson and Elisabeth Matthews and Matthew W. Mengel and Farisa Morales and Mayuko Mori and Norio Narita and Taku Nishiumi and Jack Okumura and Peter Plavchan and Sam Quinn and Markus Rabus and George Ricker and Alexander Rudat and Joshua Schlieder and Richard P. Schwarz and Sara Seager and Avi Shporer and Alexis M. S. Smith and Avi Sphorer and Keivan Stassun and Motohide Tamura and Thiam Guan Tan and C. G. Tinney and Roland Vanderspek and Varoujan Gorjian and Michael W. Werner and Richard G. West and Duncan Wright and Hui Zhang and George Zhou},
journal= {arXiv preprint arXiv:2210.08179},
year = {2023}
}
备注
submitted to MNRAS