热木星 WASP-43b 的夜侧云层与非平衡化学
地球与行星天体物理
2024-01-25 v1 天体物理仪器与方法
摘要
热木星是研究得最透彻的系外行星之一，但它们的化学成分和云层性质如何随经度变化仍知之甚少。理论模型预测云层可能在夜侧凝结，且分子丰度可被纬向风驱离平衡状态。在此，我们报告了利用 JWST 的中红外仪器（MIRI）在 5-12 m 波段测得的热木星 WASP-43b 的相位分辨发射光谱。光谱揭示了巨大的昼夜温差（平均亮温度分别为 152435 和 86323 开尔文），以及所有轨道相位下存在水吸收的证据。与三维大气模型的比较表明，相位曲线形状和发射光谱都强烈暗示了夜侧云层的存在，这些云层在气压大于约 100 mbar 时对热发射变得光学厚。昼侧与中红外光球层上方的无云大气相一致。与平衡化学的预期相反，但与非平衡动力学模型一致，夜侧未检测到甲烷（2 上限为 1-6 ppm，取决于模型假设）。
引用
@article{arxiv.2401.13027,
title = {Nightside clouds and disequilibrium chemistry on the hot Jupiter WASP-43b},
author = {Taylor J. Bell and Nicolas Crouzet and Patricio E. Cubillos and Laura Kreidberg and Anjali A. A. Piette and Michael T. Roman and Joanna K. Barstow and Jasmina Blecic and Ludmila Carone and Louis-Philippe Coulombe and Elsa Ducrot and Mark Hammond and João M. Mendonça and Julianne I. Moses and Vivien Parmentier and Kevin B. Stevenson and Lucas Teinturier and Michael Zhang and Natalie M. Batalha and Jacob L. Bean and Björn Benneke and Benjamin Charnay and Katy L. Chubb and Brice-Olivier Demory and Peter Gao and Elspeth K. H. Lee and Mercedes López-Morales and Giuseppe Morello and Emily Rauscher and David K. Sing and Xianyu Tan and Olivia Venot and Hannah R. Wakeford and Keshav Aggarwal and Eva-Maria Ahrer and Munazza K. Alam and Robin Baeyens and David Barrado and Claudio Caceres and Aarynn L. Carter and Sarah L. Casewell and Ryan C. Challener and Ian J. M. Crossfield and Leen Decin and Jean-Michel Désert and Ian Dobbs-Dixon and Achrène Dyrek and Néstor Espinoza and Adina D. Feinstein and Neale P. Gibson and Joseph Harrington and Christiane Helling and Renyu Hu and Nicolas Iro and Eliza M. -R. Kempton and Sarah Kendrew and Thaddeus D. Komacek and Jessica Krick and Pierre-Olivier Lagage and Jérémy Leconte and Monika Lendl and Neil T. Lewis and Joshua D. Lothringer and Isaac Malsky and Luigi Mancini and Megan Mansfield and Nathan J. Mayne and Thomas Mikal-Evans and Karan Molaverdikhani and Nikolay K. Nikolov and Matthew C. Nixon and Enric Palle and Dominique J. M. Petit dit de la Roche and Caroline Piaulet and Diana Powell and Benjamin V. Rackham and Aaron D. Schneider and Maria E. Steinrueck and Jake Taylor and Luis Welbanks and Sergei N. Yurchenko and Xi Zhang and Sebastian Zieba},
journal= {arXiv preprint arXiv:2401.13027},
year = {2024}
}
备注
61 pages, 13 figures, 4 tables. This preprint has been submitted to and accepted in principle for publication in Nature Astronomy without significant changes