Thermochemical equilibrium is one of the most commonly used assumptions in current exoplanet retrievals. As the James Webb Space Telescope (JWST) and Ariel launch draw near, assessing the underlying biases and assumptions made when applying self-consistent chemistry into spectral retrievals is crucial. Here we use the flexibility of TauREx 3.1 to cross-compare three state of the art chemical equilibrium codes: ACE, FastChem and GGchem. We simulate JWST spectra for ACE, FastChem, GGchem and GGchem+condensation containing only C, H, O, N elements and spectra for FastChem, GGchem and GGchem+condensation with a more extensive range of elements giving seven simulated JWST spectra in total and then cross-retrieve giving a total of 49 retrievals. Our analysis demonstrates that like-for-like, all chemical codes retrieve the correct parameters to <1% of the truth. However, retrievals, where the contained elements do not match the truth, parameters such as metallicity deviate by 20% while maintaining extremely low uncertainties <1% giving false confidence. This point is of major importance for future analyses on JWST and Ariel, highlighting that self-consistent chemical scheme that do not employ the proper assumptions (missing species, fixed elemental ratios, condensation) are at risk of confidently biasing interpretations. Free chemistry retrievals employing parametric descriptions of the chemical profiles can provide alternative unbiased explorations.
Ares: A Mars model retrieval framework for ExoMars Trace Gas Orbiter NOMAD solar occultation measurements
Ares是TauREx 3火星大气检索框架的扩展。战神是一个新的大气参数和前向模型的集合,为欧洲空间局(欧空局)的微量气体轨道器(TGO)天底和掩星火星发现(NOMAD)仪器,太阳掩星(SO)通道设计。战神通过应用系外行星大气检索中使用的方法,提供了对火星大气化学成分的独特见解,Waldmann et al.(2015),Al-Refaie et al.(2019)。这一发现可能有助于揭示火星上$CH_{4}$的真实性质。这里描述的是战神模型。随后,定义了战神的组成部分,包括:NOMAD SO通道仪器功能模型、火星大气分子吸收截面、几何模型和NOMAD噪声模型。Ares大气先验和正演模型,(即,模拟NOMAD观测),并与行星光谱发生器进行分析、比较和验证,Villanueva等人(2018)。
$\texttt{Exoformer}$: Accelerating Bayesian atmospheric retrievals with transformer neural networks
Università degli Studi di Padova(帕多瓦大学);INAF, Osservatorio Astronomico di Padova(意大利国家天体物理研究所帕多瓦天文台);Centro di Ateneo di Studi e Attività Spaziali “G. Colombo” – Università degli Studi di Padova(帕多瓦大学“G.科洛姆博”太空研究与活动中心)
Terrestrial Exoplanet Internal Structure Constraints Enabled by Comprehensive Host Star Characterization Reveal that Terrestrial Planets in Mean-motion Resonances are Water Rich
A White Paper Submitted to The National Academy of Science's Committee on Exoplanet Science Strategy: Observing Exoplanets with the James Webb Space Telescope
Toward a multidimensional analysis of transmission spectroscopy. Part I: Computation of transmission spectra using a 1D, 2D, or 3D atmosphere structure
Protoplanetary Disk Science Enabled by Extremely Large Telescopes
将星周盘中的气体和尘埃转化为各种系外行星的过程仍然知之甚少。一个关键的途径是研究系外行星在其年轻的($\sim$ few~Myr)出生盘中形成时的情况。极大望远镜(英语:Extremely Large Telescopes)(ELT),如GMT、TMT或ELT,可以用来建立行星形成的初始化学条件、位置和时间尺度,通过(1)~使用红外光谱测量原行星盘的物理和化学条件,(2)~使用成像和光谱天体测量研究行星盘的相互作用。我们目前的知识是基于有限的目标样本,代表了最明亮,最极端的情况,因此几乎可以肯定代表了不完整的理解。ELT将在这一领域发挥变革性作用,这要归功于它们将提供的高空间和光谱分辨率数据。我们推荐一个关键的科学计划,对最近的原行星盘进行高分辨率光谱学和高对比度成像的体积有限的调查,这将导致行星形成的公正,全面的图片,因为它发生。
Inclusion of sulfur chemistry in a validated C/H/O/N chemical network: identification of key C/S coupling pathways
Université Paris Cité and Univ Paris Est Creteil, CNRS, LISA(巴黎西岱大学与巴黎东克雷泰伊大学,法国国家科学研究中心,LISA);Astrophysics Group, University of Exeter(埃克塞特大学天体物理学组);Université de Lorraine, CNRS, LRGP(洛林大学,法国国家科学研究中心,LRGP);Department of Physics and Astronomy, University College London(伦敦大学学院物理与天文系)
A Next-Generation Exoplanet Atmospheric Retrieval Framework NEXOTRANS for Emission Spectroscopy: New Constraints and Atmospheric Characterization of WASP-69b Using JWST NIRCam and MIRI Observations
National Institute of Science Education and Research(印度科学教育研究国家研究所);Homi Bhabha National Institute(霍米·巴巴国立学院)
Towards a Comprehensive Understanding of Planetary Systems through Population-Level, Large-Scale Surveys
Instituto de Astrofísica de Andalucía, CSIC(安达卢西亚天体物理研究所);Centro Astronómico Hispano en Andalucía, Observatorio de Calar Alto(西班牙-安达卢西亚天文中心,卡拉阿托天文台);Astrophotonics (innoFSPEC), Leibniz-Institut für Astrophysik Potsdam (AIP)(莱布尼茨波茨坦天体物理研究所);Institut für Physik und Astronomie, Universität Potsdam(波茨坦大学物理与天文学研究所);Sydney Institute for Astronomy, The University of Sydney(悉尼大学悉尼天体物理研究所)
A Homogeneous Survey of JWST MIRI Transmission Spectra of 10 Exoplanets
Institute of Astronomy, University of Cambridge(剑桥大学天文学研究所);Space Telescope Science Institute(太空望远镜科学研究所);School of Physics and Astronomy, Cardiff University(卡迪夫大学物理与天文学院)
The climates and thermal emission spectra of prime nearby temperate rocky exoplanet targets
Purdue University(普渡大学);NASA Goddard Space Flight Center(美国宇航局戈达德太空飞行中心);Center for Research and Exploration in Space Science and Technology, NASA Goddard Space Flight Center(美国宇航局戈达德太空飞行中心空间科学与技术探索与研究中心);University of Maryland, College Park(马里兰大学帕克分校);Department of Earth, Atmospheric, and Planetary Science, Purdue University(普渡大学地球、大气和行星科学系);Department of Astronomy, University of Maryland(马里兰大学天文学系);University of Oxford(牛津大学);Blue Marble Space Institute of Science(蓝大理石太空科学研究所);American University(美利坚大学);Laboratory for Atmospheric and Space Physics, University of Colorado Boulder(科罗拉多大学博尔德分校大气与空间物理实验室)
The ExoGRAVITY survey: A K-band spectral library of giant exoplanet and brown dwarf companions
Observatoire de Paris, PSL, CNRS, Sorbonne Université, Université de Paris(巴黎天文台,PSL,法国国家科学研究中心,索邦大学,巴黎大学);Leiden Observatory, Leiden University(莱顿天文台,莱顿大学);Division of Space Research & Planetary Sciences, Physics Institute, University of Bern(伯尔尼大学物理研究所空间研究与行星科学系);Max-Planck-Institut für Astronomie(马克斯·普朗克天体物理学研究所);Fakultät für Physik, Universität Duisburg–Essen(杜伊斯堡-埃森大学物理学院);Department of Physics & Astronomy, Johns Hopkins University(约翰斯·霍普金斯大学物理与天文学系);Space Telescope Science Institute(太空望远镜科学研究所);Department of Physics, University College Cork(科克大学学院物理系);European Space Agency (ESA)(欧洲空间局);Univ. Grenoble Alpes, CNRS, IPAG(格勒诺布尔阿尔卑斯大学,法国国家科学研究中心,IPAG);School of Physics, Trinity College Dublin, The University of Dublin(都柏林三一学院物理学院,都柏林大学)
ELemental abundances of Planets and brown dwarfs Imaged around Stars (ELPIS): I. Potential Metal Enrichment of the Exoplanet AF Lep b and a Novel Retrieval Approach for Cloudy Self-luminous Atmospheres
该研究通过新型温度梯度约束反演方法,分析直接成像系外行星 AF Lep b 的大气,发现其金属增丰([Fe/H] > 1.0 dex)并存在硅酸盐云,为行星形成与演化提供新见解。