TOI-269 b：一颗绕 M2 型矮星运行的偏心亚海王星经 ExTrA 重观测确认
地球与行星天体物理
2021-06-23 v1
摘要
我们报告确认了一颗靠近超级地球与亚海王星过渡区的亚海王星，它凌星 M2 型矮星 TOI-269（TIC 220479565，V = 14.4 mag，J = 10.9 mag，Rstar = 0.40 Rsun，Mstar = 0.39 Msun，d = 57 pc）。该系外行星候选体在多个 TESS 观测扇区中被发现，并经 HARPS 的高精度光谱与 ExTrA 和 LCO-CTIO 的地面测光跟进得以验证。我们通过 juliet 联合建模测光与径向速度确定了该系外行星的质量、半径与整体密度。该凌星系外行星轨道周期 P = 3.6977104 ± 0.0000037 天，半径 2.77 ± 0.12 Rearth，质量 8.8 ± 1.4 Mearth。由于 TOI-269 b 位于其类别中大气表征的最佳目标之列，利用透射光谱探测该系外行星大气并与其他亚海王星比较将颇具意义。其偏心率 e = 0.425+0.082-0.086，TOI-269 b 是周期小于 10 天的系外行星中偏心率最高者之一。该恒星可能已有数 Gyr 年龄，此系统似非动力学年轻。我们推测 TOI-269 b 的高偏心率可能源于其经行星-行星相互作用向内迁移时所获。
引用
@article{arxiv.2104.14782,
title = {TOI-269 b: An eccentric sub-Neptune transiting a M2 dwarf revisited with ExTrA},
author = {M. Cointepas and J. M. Almenara and X. Bonfils and F. Bouchy and N. Astudillo-Defru and F. Murgas and J. F. Otegi and A. Wyttenbach and D. R. Anderson and E. Artigau and B. L. Canto Martins and D. Charbonneau and K. A. Collins and K. I. Collins and J-J. Correia and S. Curaba and A. Delboulbe and X. Delfosse and R. F. Diaz and C. Dorn and R. Doyon and P. Feautrier and P. Figueira and T. Forveille and G. Gaisne and T. Gan and L. Gluck and R. Helled and C. Hellier and L. Jocou and P. Kern and S. Lafrasse and N. Law and I. C. Leao and C. Lovis and Y. Magnard and A. W. Mann and D. Maurel and J. R. de Medeiros and C. Melo and T. Moulin and F. Pepe and P. Rabou and S. Rochat and D. R. Rodriguez and A. Roux and N. C. Santos and D. Segransan and E. Stadler and E. B. Ting and J. D. Twicken and S. Udry and W. C. Waalkes and R. G. West and A. Wunsche and C. Ziegler and G. Ricker and R. Vanderspek and D. W. Latham and S. Seager and J. Winn and J. M. Jenkins},
journal= {arXiv preprint arXiv:2104.14782},
year = {2021}
}
备注
23 pages, 16 figures, Accepted for publication in A&A