NGTS-11 b / TOI-1847 b：从TESS单次凌星事件回收的温暖土星凌星行星
地球与行星天体物理
2020-07-29 v3 太阳与恒星天体物理
摘要
我们报告发现NGTS-11 b（=TOI-1847 b），一颗绕中等K型恒星（Teff=5050 K）在35.46天轨道上运行的凌星土星。我们最初从TESS全帧图像光变曲线中的单次凌星事件识别出该系统。在使用NGTS望远镜进行七十九夜测光监测后，我们于TESS单次凌星事件约一年后观测到NGTS-11 b的第二次完整凌星。NGTS凌星确认了凌星信号的参数，并将轨道周期限制为13个离散周期的集合。我们将凌星探测与精密视向速度测量结合，以确定真实轨道周期并测得行星质量。我们发现NGTS-11 b半径为0.817+0.028-0.032 ，质量为0.344+0.092-0.073 ，平衡温度仅435+34-32 K，是最冷的已知凌星气态巨行星之一。NGTS-11 b是首颗在最初被识别为TESS单次凌星事件后被发现的系外行星，其发现凸显了密集测光监测从单次凌星事件中回收长周期凌星系外行星的能力。
引用
@article{arxiv.2005.00006,
title = {NGTS-11 b / TOI-1847 b: A transiting warm Saturn recovered from a TESS single-transit event},
author = {Samuel Gill and Peter J. Wheatley and Benjamin F. Cooke and Andrés Jordán and Louise D. Nielsen and Daniel Bayliss and David R. Anderson and Jose I. Vines and Monika Lendl and Jack S. Acton and David J. Armstrong and François Bouchy and Rafael Brahm and Edward M. Bryant and Matthew R. Burleigh and Sarah L. Casewell and Philipp Eigmüller and Néstor Espinoza and Edward Gillen and Michael R. Goad and Nolan Grieves and Maximilian N. Günther and Thomas Henning and Melissa J. Hobson and Aleisha Hogan and James S. Jenkins and James McCormac and Maximiliano Moyano and Hugh P. Osborn and Don Pollacco and Didier Queloz and Heike Rauer and Felipe Rojas and Paula Sarkis and Alexis M. S. Smith and Marcelo Tala Pinto and Rosanna H. Tilbrook and Stéphane Udry and Christopher A. Watson and Richard G. West},
journal= {arXiv preprint arXiv:2005.00006},
year = {2020}
}
备注
8 pages, 3 Figures, 1 table. Accepted to ApJ letters