ExoMol: molecular line lists for exoplanet and other atmospheres

By Jonathan Tennyson, Sergei N. Yurchenko. 2012

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The discovery of extrasolar planets is one of the major scientific advances of the last two decades. Hundreds of planets have now been detected and astronomers are beginning to characterize their composition and physical characteristics. To do this requires a huge quantity of spectroscopic data most of which are not available from laboratory studies. The ExoMol project will offer a comprehensive solution to this problem by providing spectroscopic data on all the molecular transitions of importance in the atmospheres of exoplanets. These data will be widely applicable to other problems and will be used for studies on cool stars, brown dwarfs and circumstellar environments. This paper lays out the scientific foundations of this project and reviews previous work in this area. A mixture of first principles and empirically tuned quantum mechanical methods will be used to compute comprehensive and very large rotation–vibration and rotation–vibration– electronic line lists. Methodologies will be developed for treating larger molecules such as methane and nitric acid. ExoMol will rely on these developments and the use of state-of-the-art

Subfields: Astronomy and Astrophysics, Organic Chemistry, Spectroscopy

View Paper: https://www.semanticscholar.org/paper/69d829799452f34247fdedca3745047adbe5e5c8

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Citations in the corpus

ExoMol line lists - III. An improved hot rotation-vibration line list for HCN and HNC (2013, background): “This project aims to provide line lists of spectroscopic transitions for key molecular species which are likely to be important in the atmospheres of extrasolar planets and cool stars; its aims, scope and methodology are summarised in Tennyson & Yurchenko (2012).”
The 2009 edition of the GEISA spectroscopic database (2011, methodology): “In the future these will be combined with intensities from BYTe and a new, more extensive and more accurate ammonia line list is being computed as part of the ExoMol project [189].”
The ExoMol database: Molecular line lists for exoplanet and other hot atmospheres (2016, background): “jsonresult['(15N)(1H)3']['linelist']['BYTe-15']['files'][1]['url'].”
IUPAC critical evaluation of the rotational-vibrational spectra of water vapor, Part III: Energy levels and transition (2013, background): “Among many other applications of such data, an extreme quantity of high-quality molecular data are needed to understand properties of spectroscopic measurements related to different stars and the atmospheres of planets and exoplanets [232].”
ExoMol molecular line lists – XXXIII. The spectrum of Titanium Oxide (2019, background): “The ExoMol project (Tennyson & Yurchenko 2012) aims to produce high-temperature line lists of spectroscopic transitions for key molecular species likely to be significant in the analysis of the atmospheres of extrasolar planets and cool stars.”
GASEOUS MEAN OPACITIES FOR GIANT PLANET AND ULTRACOOL DWARF ATMOSPHERES OVER A RANGE OF METALLICITIES AND TEMPERATURES (2014, background): “SOURCES OF OPACITY AND CHEMICAL ABUNDANCES Modern calculations of warm planetary atmospheres must draw from a variety of databases, including HITRAN (Rothman et al. 2009), HITEMP (Rothman et al. 2010), ExoMol (Tennyson & Yurchenko 2012), and other sources.”
ExoMol line lists IV: The rotation-vibration spectrum of methane up to 1500 K (2014, background): “Recently, we (Tennyson & Yurchenko 2012) started the ExoMol project which aims to generate a comprehensive library of line list for all molecules likely to be important for modelling atmospheres of exoplanets and cool stars.”
ExoMol line lists – XVIII. The high-temperature spectrum of VO (2016, background): “The ExoMol project (Tennyson & Yurchenko 2012, 2014) aims to produce high temperature line lists of spectroscopic transitions for key molecular species likely to be significant in the analysis of the atmospheres of extrasolar planets and cool stars.”
CH in stellar atmospheres: an extensive linelist (2014, methodology): “Great efforts have been devoted to improving atomic and molecular line data, e.g. VALD (Kupka et al. 1999) and DREAM (Biémont et al. 1999) for atoms, and Bernath (2009) and EXOMOL (Tennyson & Yurchenko 2012) for molecules.”
The 2020 release of the ExoMol database: Molecular line lists for exoplanet and other hot atmospheres (2020, background): “jsonresult['(15N)(1H)3']['linelist']['BYTe-15']['files'][1]['url'].”
ExoMol molecular line lists XXX: a complete high-accuracy line list for water (2018, methodology): “This work is performed as part of the ExoMol project (Tennyson & Yurchenko 2012), which aims to provide molecular line lists for exoplanet and other hot atmospheres.”
The 2015 edition of the GEISA spectroscopic database (2016, methodology): “Table 1 Updated molecular species in the GEISA-2015 edition Molecular Species ID Contributors H2O 1 L. Coudert, J. Tennyson, A. Campargue, S. Mikhailenko, O.V. Naumenko, J. Orphal, A. Ruth, R.R. Gamache CO2 2 V.I. Perevalov, S. Tashkun, R.R. Gamache O3 3 A. Barbe, S. Mikhailenko, Vl.G. Tyuterev CH4 ”
DETECTION OF AN ATMOSPHERE AROUND THE SUPER-EARTH 55 CANCRI E (2015, methodology): “The transmission spectra are generated using cross sections based on the line lists from ExoMol (Tennyson & Yurchenko 2012; Barber et al. 2006; Yurchenko et al. 2011; Barton et al. 2013; Yurchenko & Tennyson 2014; Barber et al. 2014), HITRAN (Rothman et al. 2009, 2013) and HITEMP (Rothman et al. 201”
On the Cool Side: Modeling the Atmospheres of Brown Dwarfs and Giant Planets (2014, methodology): “Commonly used line lists include the HITRAN (Rothman et al. 1987, 2013), HITEMP (Rothman et al. 1995, 2010), and ExoMol (Tennyson & Yurchenko 2012) databases, where the latter is more appropriate for the range of temperatures encountered in sub-stellar atmospheres, but only includes data for H2O,…”