TOI-7169 b：绕金属贫瘦恒星的热巨行星
摘要
已知的大多数行星都围绕金属丰富的宿主星，使得它变得困难确定金属形成下限是否存在以及金属稀缺环境中行星属性可能如何不同于金属丰富来源。我们报告发现和表征 TOI-7169 b (TIC 372048733 b)，一种绕光谱确认的金属贫瘦 ([Fe/H] = -0.72 +/- 0.05) 宿主星的热巨行星。基于 TESS 和后续地面观测的光度测量，我们测得轨道周期为 3.4373125 d 和行星半径为 1.475 +/- 0.029 R_Jup。我们使用 TRES 光谱学确定 TOI-7169 b 的质量为 0.41 +/- 0.14 M_Jup。该行星因此膨胀，密度低为 0.159 +0.055/-0.054 g/cm^3。我们还表征了宿主星，显示 TOI-7169 是古老的 (12.3 +/- 0.6 Gyr) 和 alpha-增强 ([alpha/Fe] ~ 0.3), but with a Galactocentric orbit that is confined to the thin disk. TOI-7169 is perhaps the oldest and most metal-poor star currently known to host a transiting giant planet. Future transmission spectroscopy probing the atmosphere of TOI-7169 b may provide insight into the effect of metallicity on the physical properties of giant planets.
引用
@article{arxiv.2603.25787,
title = {TOI-7169 b: A Hot Jupiter Transiting a Metal-Poor Star},
author = {Joshua D. Simon and Joseph E. Rodriguez and Jhon Yana Galarza and David W. Latham and Victoria DiTomasso and Karen A. Collins and Jack Schulte and Anirudh Chiti and Samuel N. Quinn and Mohammad K. Mardini and Shubham Kanodia and Johanna K. Teske and Peter S. Ferguson and Samuel W. Yee and T. G. Tan and Khalid Alsubai and Khalid Barkaoui and Zouhair Benkhaldoun and Krzysztof Bernacki and Jaikrit Bhattacharya and Jerome P. de Leon and Sarah J. Deveny and Mark E. Everett and Izuru Fukuda and Akihiko Fukui and Michael Gillon and Arvind F. Gupta and Steve B. Howell and Emmanuel Jehin and Gaia Lacedelli and Adam Lark and Colin Littlefield and Felipe Murgas and Norio Narita and Enric Palle and Hannu Parviainen and Adam Popowicz and Richard P. Schwarz and Avi Shporer and Abderahmane Soubkiou and Francis P. Wilkin},
journal= {arXiv preprint arXiv:2603.25787},
year = {2026}
}
备注
20 pages, 9 figures, 6 tables. Submitted to AAS Journals