WASP-39b 大气中光化学产生的 SO₂
地球与行星天体物理
2023-05-24 v2 太阳与恒星天体物理
摘要
光化学是行星大气的基本过程，调节着大气成分与稳定性。然而，迄今为止尚未在系外行星大气中探测到明确的化学产物。JWST 凌星系外行星早期释放科学计划的最新观测发现，WASP-39b 大气中在 4.05 μm 处有一个由 SO₂ 引起的光谱吸收特征。WASP-39b 是一颗半径为 1.27 倍木星、土星质量（0.28 M_J）的气态巨行星系外行星，绕类太阳恒星运行，平衡温度约 1100 K。在此类大气中生成 SO₂ 最合理的方式是通过光化学过程。在此我们表明，由一套光化学模型计算的 SO₂ 分布稳健地解释了 JWST 透射观测（NIRSpec PRISM 2.7σ 和 G395H 4.5σ）所识别的 4.05 μm 光谱特征。SO₂ 由硫化氢（H₂S）被破坏时释放的硫自由基经连续氧化产生。SO₂ 特征对大气重元素富集（金属丰度）的敏感性表明，它可用作大气性质的示踪物，WASP-39b 推断的金属丰度约为太阳的 10×。我们进一步指出，SO₂ 在紫外和热红外波长处也显示出现有观测无法获得的可观测特征。
引用
@article{arxiv.2211.10490,
title = {Photochemically-produced SO$_2$ in the atmosphere of WASP-39b},
author = {Shang-Min Tsai and Elspeth K. H. Lee and Diana Powell and Peter Gao and Xi Zhang and Julianne Moses and Eric Hébrard and Olivia Venot and Vivien Parmentier and Sean Jordan and Renyu Hu and Munazza K. Alam and Lili Alderson and Natalie M. Batalha and Jacob L. Bean and Björn Benneke and Carver J. Bierson and Ryan P. Brady and Ludmila Carone and Aarynn L. Carter and Katy L. Chubb and Julie Inglis and Jérémy Leconte and Mercedes Lopez-Morales and Yamila Miguel and Karan Molaverdikhani and Zafar Rustamkulov and David K. Sing and Kevin B. Stevenson and Hannah R Wakeford and Jeehyun Yang and Keshav Aggarwal and Robin Baeyens and Saugata Barat and Miguel de Val Borro and Tansu Daylan and Jonathan J. Fortney and Kevin France and Jayesh M Goyal and David Grant and James Kirk and Laura Kreidberg and Amy Louca and Sarah E. Moran and Sagnick Mukherjee and Evert Nasedkin and Kazumasa Ohno and Benjamin V. Rackham and Seth Redfield and Jake Taylor and Pascal Tremblin and Channon Visscher and Nicole L. Wallack and Luis Welbanks and Allison Youngblood and Eva-Maria Ahrer and Natasha E. Batalha and Patrick Behr and Zachory K. Berta-Thompson and Jasmina Blecic and S. L. Casewell and Ian J. M. Crossfield and Nicolas Crouzet and Patricio E. Cubillos and Leen Decin and Jean-Michel Désert and Adina D. Feinstein and Neale P. Gibson and Joseph Harrington and Kevin Heng and Thomas Henning and Eliza M. -R. Kempton and Jessica Krick and Pierre-Olivier Lagage and Monika Lendl and Michael Line and Joshua D. Lothringer and Megan Mansfield and N. J. Mayne and Thomas Mikal-Evans and Enric Palle and Everett Schlawin and Oliver Shorttle and Peter J. Wheatley and Sergei N. Yurchenko},
journal= {arXiv preprint arXiv:2211.10490},
year = {2023}
}
备注
39 pages, 14 figures, accepted to be published in Nature