NGTS-28Ab：一颗短周期凌日褐矮星
地球与行星天体物理
2024-02-16 v1 太阳与恒星天体物理
摘要
我们报告发现了一颗围绕 M1 型主星运行的褐矮星。我们首先在下一代凌日巡天（Next Generation Transit Survey）数据中识别出该褐矮星，并在 TESS 第 11 和 38 扇区找到了支持性观测数据。我们利用来自南非天文台、SPECULOOS-S 和 TRAPPIST-S 的后续测光数据，以及来自 HARPS 的径向速度测量数据确认了这一发现，从而对该系统进行了表征。我们发现其轨道周期约为 1.25 天，质量为 （接近氢燃烧极限），半径为 。利用模型等时线确定其年龄大于 0.5 Gyr，这与误差范围内的 SED 拟合结果一致。NGTS-28Ab 是褐矮星荒漠中发现的周期最短的系统之一，也是凌日 M 型矮星的最高质量褐矮星之一。这使得 NGTS-28Ab 成为这一稀疏区域中的又一重要发现。
引用
@article{arxiv.2402.09943,
title = {NGTS-28Ab: A short period transiting brown dwarf},
author = {Beth A. Henderson and Sarah L. Casewell and Michael R. Goad and Jack S. Acton and Maximilian N. Günther and Louise D. Nielsen and Matthew R. Burleigh and Claudia Belardi and Rosanna H. Tilbrook and Oliver Turner and Steve B. Howell and Catherine A. Clark and Colin Littlefield and Khalid Barkaoui and Douglas R. Alves and David R. Anderson and Daniel Bayliss and Francois Bouchy and Edward M. Bryant and George Dransfield and Elsa Ducrot and Philipp Eigmüller and Samuel Gill and Edward Gillen and Michaël Gillon and Faith Hawthorn and Matthew J. Hooton and James A. G. Jackman and Emmanuel Jehin and James S. Jenkins and Alicia Kendall and Monika Lendl and James McCormac and Maximiliano Moyano and Peter Pihlmann Pedersen and Francisco J. Pozuelos and Gavin Ramsay and Ramotholo R. Sefako and Mathilde Timmermans and Amaury H. M. J. Triaud and Stephane Udry and Jose I. Vines and Christopher A. Watson and Richard G. West and Peter J. Wheatley and Sebastián Zúñiga-Fernández},
journal= {arXiv preprint arXiv:2402.09943},
year = {2024}
}
备注
20 pages (inc. appendices), 16 figures, accepted for publication in MNRAS