TOI-757 b：一颗17.5天轨道上的偏心凌星迷你海王星
地球与行星天体物理
2024-07-31 v1
摘要
我们报告了TOI-757 b的光谱确认和基本属性，这是一颗由TESS任务发现的、围绕一颗亮星（ mag）运行的17.5天轨道的迷你海王星。我们使用HARPS、ESPRESSO和PFS光谱仪获取了高精度径向速度测量，以确认行星探测并确定其质量。我们还使用CHEOPS太空望远镜获取了空间凌星光度测量，以对行星半径施加更强的约束，并以地面LCOGT光度测量作为补充。WASP和KELT光度测量被用于帮助约束恒星自转周期。我们还确定了宿主恒星的基本参数。我们发现TOI-757 b的半径为 ，质量为 ，意味着体密度为 g cm。我们的内部组成建模未能约束TOI-757 b的组成，这凸显了大气观测对该系统的重要性。我们还发现该行星具有高偏心率 ，使其成为在精确表征的迷你海王星中极少数的高偏心率行星之一。基于与其他类似偏心率系统的比较，我们发现TOI-757 b的形成情景很可能是由于遥远的外层伴星导致的高偏心率迁移。考虑到TOI-757的低金属丰度和较老年龄，我们还提出了一种由星系盘形成早期恒星-恒星相互作用导致高偏心率的内在解释的可能性。
引用
@article{arxiv.2407.20525,
title = {TOI-757 b: an eccentric transiting mini-Neptune on a 17.5-d orbit},
author = {A. Alqasim and N. Grieves and N. M. Rosário and D. Gandolfi and J. H. Livingston and S. Sousa and K. A. Collins and J. K. Teske and M. Fridlund and J. A. Egger and J. Cabrera and C. Hellier and A. F. Lanza and V. Van Eylen and F. Bouchy and R. J. Oelkers and G. Srdoc and S. Shectman and M. Günther and E. Goffo and T. Wilson and L. M. Serrano and A. Brandeker and S. X. Wang and A. Heitzmann and A. Bonfanti and L. Fossati and Y. Alibert and L. Delrez and R. Sefako and S. Barros and K. I. Collins and O. D. S. Demangeon and S. H. Albrecht and R. Alonso and J. Asquier and T. Barczy and D. Barrado and W. Baumjohann and T. Beck and W. Benz and N. Billot and L. Borsato and C. Broeg and E. M. Bryant and R. P. Butler and W. D. Cochran and A. Collier Cameron and A. C. M. Correia and J. D. Crane and Sz. Csizmadia and P. E. Cubillos and M. B. Davies and T. Daylan and M. Deleuil and A. Deline and B. -O. Demory and A. Derekas and B. Edwards and D. Ehrenreich and A. Erikson and Z. Essack and A. Fortier and K. Gazeas and M. Gillon and M. Gudel and J. Hasiba and A. P. Hatzes and Ch. Helling and T. Hirano and S. B. Howell and S. Hoyer and K. G. Isaak and J. M. Jenkins and S. Kanodia and L. L. Kiss and J. Korth and K. W. F. Lam and J. Laskar and A. Lecavelier des Etangs and M. Lendl and M. B. Lund and R. Luque and A. W. Mann and D. Magrin and P. F. L. Maxted and C. Mordasini and N. Narita and V. Nascimbeni and G. Nowak and G. Olofsson and H. P. Osborn and H. L. M. Osborne and D. Osip and R. Ottensamer and I. Pagano and E. Palle and G. Peter and G. Piotto and D. Pollacco and D. Queloz and R. Ragazzoni and N. Rando and H. Rauer and S. Redfield and I. Ribas and M. Rice and G. R. Ricker and M. Rieder and S. Salmon and N. C. Santos and G. Scandariato and S. Seager and D. Segransan and A. Shporer and A. E. Simon and A. M. S. Smith and M. Stalport and Gy. M. Szabo and I. Thompson and J. D. Twicken and S. Udry and R. Vanderspek and V. Van Grootel and J. Venturini and E. Villaver and J. Villaseñor and V. Viotto and I. Walter and N. A. Walton and J. N. Winn and S. W. Yee},
journal= {arXiv preprint arXiv:2407.20525},
year = {2024}
}
备注
Accepted for publication in MNRAS; 26 pages, 14 figures, 6 tables