TOI-6508b：一颗绕低质量恒星运行的大质量穿越棕矿星
地球与行星天体物理
2025-02-28 v1 太阳与恒星天体物理
摘要
我们报告发现的一颗穿越棕矿星 TOI-6508b。目前，仅有约 50 颗穿越棕矿星被发现。TOI-6508b 首先由位于 TESS 第 10、37 和 63 区的数据发现。随后采用 SPECULOOS-South 和 LCOGT-1.0m 望远镜获取地面跟踪光度数据，并利用 Near InfraRed Planet Searcher (NIRPS) 光谱仪获取径向速度测量数据。我们发现 TOI-6508b 的质量为 Mp=72.5+7.6-5.1MJup，半径为 Rp=1.03+/-0.03RJup。我们的模型显示数据与 19 天偏心轨道和偏心率 e=0.28+0.09-0.08 相符。TOI-6508b 的质量比为 M_BD/Ms=0.40，是已发现绕低质量恒星运行的第二高质量比例棕矿星。该主机星的质量为 Ms=0.174+/-0.004M_Sun，半径为 Rs=0.205+/-0.006R_Sun，有效温度为 Teff=2930+/-70K，金属丰度为 [Fe/H]=-0.22+/-0.08。这一发现填补了一个仍相对稀少的天体区域。
引用
@article{arxiv.2502.19940,
title = {TOI-6508b: A massive transiting brown dwarf orbiting a low-mass star},
author = {K. Barkaoui and D. Sebastian and S. Zúñiga-Fernández and A. H. M. J. Triaud and B. V. Rackham and A. J. Burgasser and T. W. Carmichael and M. Gillon and C. Theissen and E. Softich and B. Rojas-Ayala and G. Srdoc and A. Soubkiou and A. Fukui and M. Timmermans and M. Stalport and A. Burdanov and D. R. Ciardi and K. A. Collins and Y. T. Davis and F. Davoudi and J. de Wit and B. O. Demory and S. Deveny and G. Dransfield and E. Ducrot and L. Florian and T. Gan and Y. Gómez Maqueo Chew and M. J. Hooton and S. B. Howell and J. M. Jenkins and C. Littlefield and E. L. Martín and F. Murgas and P. Niraula and E. Palle and P. P. Pedersen and F. J. Pozuelos and D. Queloz and G. Ricker and R. P. Schwarz and S. Seager and A. Shporer and M. G. Scott and C. Stockdale and J. Winn},
journal= {arXiv preprint arXiv:2502.19940},
year = {2025}
}
备注
17 pages, Accepted for publication in Astronomy and Astrophysics