HD207897 b：一颗凌星致密亚海王星，绕邻近明亮 K 型恒星运行
地球与行星天体物理
2022-03-14 v1
摘要
我们报告了一颗凌星亚海王星的发现和表征，它以 16.20 天周期围绕邻近(28 pc)且明亮(V=8.37)的 K0V 恒星 HD207897 (TOI-1611) 运行。该发现基于凌星系外行星巡天卫星(TESS)任务的光度测量以及来自 SOPHIE、自动行星搜寻器(APF)和 HIRES 高精度光谱仪的视向速度(RV)观测。我们使用 EXOFASTv2 同时建模行星及其宿主恒星的参数，结合光度和 RV 数据以确定行星系统参数。我们显示该行星半径为 2.50+/-0.08 RE，质量为 14.4+/-1.6 ME 或 15.9+/-1.6 ME，概率几乎相等；两种解对应于恒星活动周期的两种可能性。因此密度为 5.1+/-0.7 g cm^-3 或 5.5^{+0.8}_{-0.7} g cm^-3，使其成为相对罕见的致密亚海王星之一。在当前观测到的亚海王星(2<RE<4)群体中，这样一颗距宿主恒星仅 0.12 AU 的致密行星是不寻常的。最可能的情形是该行星已迁移至当前位置。
引用
@article{arxiv.2110.08597,
title = {HD207897 b: A dense sub-Neptune transiting a nearby and bright K-type star},
author = {N. Heidari and I. Boisse and J. Orell-Mique and G. Hebrard and L. Acuna and N. C. Hara and J. Lillo-Box and J. D. Eastman and L. Arnold and N. Astudillo-Defru and V. Adibekyan and A. Bieryla and X. Bonfils and F. Bouchy and T. Barclay and C. E. Brasseur and S. Borgniet and V. Bourrier and L. Buchhave and A. Behmard and C. Beard and N. M . Batalha and B. Courcol and P. Cortes-Zuleta and K. Collins and A. Carmona and I. J. M. Crossfield and A. Chontos and X. Delfosse and S. Dalal and M. Deleuil and O. D. S. Demangeon and R. F. Diaz and X. Dumusque and T. Daylan and D. Dragomir and E. Delgado Mena and C. Dressing and F. Dai and P. A. Dalba and D. Ehrenreich and T. Forveille and B. Fulton and T. Fetherolf and G. Gaisne and S. Giacalone and N. Riazi and S. Hoyer and M. J. Hobson and A. W. Howard and D. Huber and M. L. Hill and L. A. Hirsch and H. Isaacson and J. Jenkins and S. R. Kane and F. Kiefer and R. Luque and D. W. Latham and J. Lubin and T. Lopez and O. Mousis and C. Moutou and G. Montagnier and L. Mignon and A. Mayo and T. Mocnik and J. M. A. Murphy and E. Palle and F. Pepe and E. A. Petigura and J. Rey and G. Ricker and P. Robertson and A. Roy and R. A. Rubenzahl and L. J. Rosenthal and A. Santerne and N. C. Santos and S. G. Sousa and K. G. Stassun and M. Stalport and N. Scarsdale and P. A. Strom and S. Seager and D. Segransan and P. Tenenbaum and R. Tronsgaard and S. Udry and R. Vanderspek and F. Vakili and J. Winn and L. M. Weiss},
journal= {arXiv preprint arXiv:2110.08597},
year = {2022}
}
备注
18 pages, 12 figures, 6 tables; accepted for publication in the A&A journal; comments welcome