行星 WASP-39 b 的非均匀终端区
地球与行星天体物理
2024-07-16 v1
摘要
传输光谱法是过去二十年间约束类星体大气物理与化学性质的核心技术之一，其经典关键假设是所探测的大气部分——终端区——是均匀的。然而，过去十年间已有多项工作对此提出质疑，尤其是针对高度辐射、温度约为 K 以上的气体巨型类星体。虽然模型预测晚端（日-夜）与早端（夜-日）终端区之间存在明显差异，但迄今尚无报告对任何一颗类星体进行宽波段的直接早/晚端传输光谱测量。本文在假设 WASP-39 b 拥有精确且准确的轨道参数的前提下，报告了 WASP-39 b 非均匀终端区的探测，从而允许我们在近红外波段（m）中获取其早端与晚端传输光谱。我们观察到晚端的迁移深度平均比早端大 ppm，且在整体特征上也大于早端光谱。所观测到的光谱最佳解释为：晚端终端区比早端终端区温度高 K，且两端的 C/O 比均与太阳含量相符。一般流动模型（GCMs）预测的温度差值与上述值基本一致，并指向早端终端区潮湿、晚端终端区较为澄清。
引用
@article{arxiv.2407.10294,
title = {Inhomogeneous terminators on the exoplanet WASP-39 b},
author = {Néstor Espinoza and Maria E. Steinrueck and James Kirk and Ryan J. MacDonald and Arjun B. Savel and Kenneth Arnold and Eliza M. -R. Kempton and Matthew M. Murphy and Ludmila Carone and Maria Zamyatina and David A. Lewis and Dominic Samra and Sven Kiefer and Emily Rauscher and Duncan Christie and Nathan Mayne and Christiane Helling and Zafar Rustamkulov and Vivien Parmentier and Erin M. May and Aarynn L. Carter and Xi Zhang and Mercedes López-Morales and Natalie Allen and Jasmina Blecic and Leen Decin and Luigi Mancini and Karan Molaverdikhani and Benjamin V. Rackham and Enric Palle and Shang-Min Tsai and Eva-Maria Ahrer and Jacob L. Bean and Ian J. M. Crossfield and David Haegele and Eric Hébrard and Laura Kreidberg and Diana Powell and Aaron D. Schneider and Luis Welbanks and Peter Wheatley and Rafael Brahm and Nicolas Crouzet},
journal= {arXiv preprint arXiv:2407.10294},
year = {2024}
}
备注
Published in Nature at https://www.nature.com/articles/s41586-024-07768-4. All code to produce plots (with data) can be found at https://github.com/nespinoza/wasp39-terminators