位于半径谷中绕类太阳恒星 HD 110113 运行的热迷你海王星
地球与行星天体物理
2021-02-03 v1
摘要
我们报告发现 HD 110113 b（TOI-755.01），一颗绕类太阳恒星 HD 110113（Teff = 5730K）运行、轨道周期 2.5 天的凌星迷你海王星系外行星。利用 TESS 测光与 NCORES 项目采集的 HARPS 视向速度，我们发现 HD 110113 b 的半径为 ，质量为 。由此得到的密度 g cm^{-3} 显著低于纯岩石世界应有的密度；因此，HD 110113 b 必定是一颗拥有显著挥发性大气的迷你海王星。其高入射通量使其位于所谓的半径谷内；然而，在约 Gyr 的寿命中，HD 110113 b 得以保留相当数量（0.1-1%）的 H-He 大气。通过对多个活动指标进行新颖的同步高斯过程拟合，我们还从视向速度中拟合出周期为 d 的强恒星自转信号，并确认存在一颗额外的非凌星行星，其质量为 ，周期为 d。
引用
@article{arxiv.2101.04745,
title = {A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113},
author = {H. P. Osborn and D. J. Armstrong and L. D. Nielsen and Karen A. Collins and V. Adibekyan and E. Delgado-Mena and G. W. King and J. F. Otegi and N. C. Santos and S. B. Howell and J. Lillo-Box and C. Ziegler and Coel Hellier and C. Briceño and N. Law and A. W. Mann and N. Scott and G. Ricker and R. Vanderspek and David W. Latham and S. Seager and J. N. Winn and Jon M. Jenkins and Diana Dragomir and Dana R. Louie and Benjamin V. Rackham and Joel Villaseñor and Chris Burke and Tansu Daylan and Ares Osborn and D. Barrado and Dennis M. Conti and Eric L. N. Jensen and S. G. Sousa and S. Hoyer and D. A. Caldwell and Jeffrey C. Smith and David R. Rodriguez and Olivier D. S. Demangeon and Daniel Bayliss and Keivan G. Stassun and Susana C. C. Barros and Edward M. Bryant and D. J. A. Brown and P. Figueira and D. R. Anderson and R. West and F. Bouchy and S. Udry and Peter J. Wheatley and R. F. Díaz and D. L. Pollacco and M. Deleuil and C. Dorn and R. Helled and Paul Strøm},
journal= {arXiv preprint arXiv:2101.04745},
year = {2021}
}
备注
17 pages, 11 figures. Accepted for publication at MNRAS. HARPS RVs available at https://dace.unige.ch/radialVelocities/?pattern=HD110113