Infrared spectra of TiO2 clusters for hot Jupiter atmospheres

被引:0
作者
Sindel, J. P. [1 ,2 ,3 ,4 ]
Helling, Ch. [1 ,5 ]
Gobrecht, D. [4 ,6 ]
Chubb, K. L. [2 ]
Decin, L. [4 ]
机构
[1] Austrian Acad Sci, Space Res Inst, Schmiedlstr 6, A-8042 Graz, Austria
[2] Univ St Andrews, Ctr Exoplanet Sci, North Haugh, St Andrews KY16 9SS, Fife, Scotland
[3] Univ St Andrews, Sch Phys & Astron, SUPA, North Haugh, St Andrews KY16 9SS, Fife, Scotland
[4] Katholieke Univ Leuven, Inst Astron, Celestijnenlaan 200D, B-3001 Leuven, Belgium
[5] Graz Univ Technol, Fak Math Phys & Geodasie, Petersgasse 16, A-8010 Graz, Austria
[6] Univ Gothenburg, Dept Chem & Mol Biol, Kemigarden 4, S-41296 Gothenburg, Sweden
关键词
line: profiles; molecular data; planets and satellites: atmospheres; infrared: planetary systems; MEAN MOTION RESONANCES; LONG-TERM DYNAMICS; KUIPER-BELT; NEPTUNES MIGRATION; CHEMICAL-COMPOSITION; EXTRASOLAR PLANET; PHASE; CLOUD; MODEL; INSTABILITY;
D O I
10.1051/0004-6361/202346347
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Context. Clouds appear to be an unavoidable phenomenon in cool and dense environments. Hence, their inclusion is a necessary part of explaining observations of exoplanet atmospheres, most recently those of WASP 96b with the James Webb Space Telescope (JWST). Understanding the formation of cloud condensation nuclei in non-terrestrial environments is therefore crucial in developing accurate models to interpret current and future observations. Aims. The goal of the paper is to support observations with infrared spectra for (TiO2)(N) clusters to study cloud formation in exoplanet atmospheres. Methods. We derived vibrational frequencies from quantum-chemical calculations for 123 (TiO2)-clusters and their isomers and we evaluated their line-broadening mechanisms. Cluster spectra were calculated for several atmospheric levels for two example exoplanet atmospheres (WASP 121b-like and WASP 96b-like) to identify possible spectral fingerprints for cloud formation. Results. The rotational motion of clusters and the rotational transitions within them cause significant line broadening, so that individual vibrational lines are broadened beyond the spectral resolution of the medium-resolution mode of the JWST mid-infrared instrument (MIRI) at R = 3000. However, each individual cluster isomer exhibits a 'fingerprint' IR spectrum. In particular, larger (TiO2) clusters have distinctly different spectra from smaller clusters. The morning and evening terminator for the same planet can exhibit different total absorbances, due to the greater abundance of different cluster sizes. Conclusions. The largest (TiO2) clusters are not necessarily the most abundant (TiO2) clusters in the high-altitude regions of ultra-hot Jupiters and the different cluster isomers do contribute to the local absorbance. Planets with a considerable day-night asymmetry will be most suitable in the search for (TiO2) cluster isomers with the goal of improving cloud formation modelling.
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页数:8
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共 63 条
  • [51] Spanget-Larsen J, 2015, IR intensity and Lorentz epsilon curve form 'Gaussian' FREQ output, DOI [10.13140/RG.2.1.4181.6160, DOI 10.13140/RG.2.1.4181.6160]
  • [52] Accretion in the Edgeworth-Kuiper Belt: Forming 100-1000 km radius bodies at 30 AU and beyond
    Stern, SA
    Colwell, JE
    [J]. ASTRONOMICAL JOURNAL, 1997, 114 (02) : 841 - &
  • [53] Stock JW, 2018, MON NOT R ASTRON SOC, V479, P865, DOI [10.1093/nunas/sty1531, 10.1093/mnras/sty1531]
  • [54] Stickiness in three-dimensional volume preserving mappings
    Sun, Yi-Sui
    Zhou, Li-Yong
    [J]. CELESTIAL MECHANICS & DYNAMICAL ASTRONOMY, 2009, 103 (02) : 119 - 131
  • [55] The properties of Jovian Trojan asteroids listed in SDSS Moving Object Catalogue 3
    Szabo, Gy. M.
    Ivezic, Z.
    Juric, M.
    Lupton, R.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2007, 377 (04) : 1393 - 1406
  • [56] Not a Simple Relationship between Neptune's Migration Speed and Kuiper Belt Inclination Excitation
    Volk, Kathryn
    Malhotra, Renu
    [J]. ASTRONOMICAL JOURNAL, 2019, 158 (02)
  • [57] Transmission spectral properties of clouds for hot Jupiter exoplanets
    Wakeford, H. R.
    Sing, D. K.
    [J]. ASTRONOMY & ASTROPHYSICS, 2015, 573
  • [58] Gaussian basis sets for use in correlated molecular calculations .6. Sextuple zeta correlation consistent basis sets for boron through neon
    Wilson, AK
    vanMourik, T
    Dunning, TH
    [J]. THEOCHEM-JOURNAL OF MOLECULAR STRUCTURE, 1996, 388 : 339 - 349
  • [59] A HYPOTHESIS FOR THE COLOR BIMODALITY OF JUPITER TROJANS
    Wong, Ian
    Brown, Michael E.
    [J]. ASTRONOMICAL JOURNAL, 2016, 152 (04)
  • [60] Trojan asteroids and the co-orbital dust ring of Venus
    Xu, Yang-Bo
    Zhou, Lei
    Lhotka, Christoph
    Zhou, Li-Yong
    Ip, Wing-Huen
    [J]. ASTRONOMY & ASTROPHYSICS, 2022, 666