ExoMol line lists - III. An improved hot rotation-vibration line list for HCN and HNC

By R. Barber, J. Strange, C. Hill, Oleg L. Polyansky, G. Mellau, Sergei N. Yurchenko, Jonathan Tennyson. 2013

204 citations recorded by the source corpus.

ABSTRACT A revised rotation-vibration line list for the combined hydrogen cyanide (HCN)/ hydrogen isocyanide (HNC) system is presented. The line list uses ab initio transi-tion intensities calculated previously (Harris et al., ApJ, 2002, 578, 657) and extensivedatasets of recently measured experimental energy levels (Mellau, J. Chem. Phys. andJ. Mol. Spectrosc. 2010-2011). The resulting line list has signi cantly more accuratewavelengths than previous ones for these systems. An improved value for the sepa-ration between HCN and HNC is adopted leading to an approximately 25 % lowerpredicted thermal population of HNC as a function of temperature in the key 2000 to3000 K region. Temperature-dependent partition functions and equilibrium constantsare presented. The line lists are validated by comparison with laboratory spectra andare presented in full as supplementary data to the article and at www.exomol.com.Key words: molecular data; opacity; astronomical data bases: miscellaneous; planetsand satellites: atmospheres; stars: low-mass

Subfields: Atmospheric Science, Atomic and Molecular Physics, and Optics, Spectroscopy

View Paper: https://www.semanticscholar.org/paper/f14855086a191e74d1e696e34c5c285cd6c097b1

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Citations in the corpus

TAU-REX I: A NEXT GENERATION RETRIEVAL CODE FOR EXOPLANETARY ATMOSPHERES (2014, background): “…lists valid over extended temperature ranges for a variety of molecules including water (Barber et al. 2006), ammonia (Yurchenko et al. 2011), methane Yurchenko & Tennyson (2014) and a variety of diatomic molecules (Yadin et al. 2012; Barton et al. 2013; Barber et al. 2014; Barton et al. 2014).”
The ExoMol database: Molecular line lists for exoplanet and other hot atmospheres (2016, background): “[96] IV CH4 1 2000 1 34 153 806 005 YT34to10 4 Yurchenko and Tennyson [97], Yurchenko et al.”
The 2020 release of the ExoMol database: Molecular line lists for exoplanet and other hot atmospheres (2020, background): “[96] IV CH4 1 2000 1 34 153 806 005 YT34to10 4 Yurchenko and Tennyson [97], Yurchenko et al.”
ExoMol line lists IV: The rotation-vibration spectrum of methane up to 1500 K (2014, unknown): “…next member in the series of line lists provided by the ExoMol project (Tennyson & Yurchenko 2012; Yadin et al. 2012; Barton, Yurchenko & Tennyson 2013; Barber et al. 2014), which aims to provide comprehensive line lists for studies of hot atmospheres such as exoplanet, brown dwarfs and cool stars.”
ExoMol molecular line lists – XXXV. A rotation-vibration line list for hot ammonia (2019, methodology): “This procedure has been used for other polyatomic ExoMol line lists (Barber et al. 2014; Polyansky et al. 2018) and has been shown to give good results (Huang, Schwenke & Lee 2019).”
DETECTION OF AN ATMOSPHERE AROUND THE SUPER-EARTH 55 CANCRI E (2015, methodology): “We also note that while there is a good line list available for the hot HCN/HNC system (Harris et al. 2002; Barber et al. 2014), there is no comprehensive line list available for hot C2H2; provision of such a list is important for future studies of this interesting system.”
ExoMol molecular line lists XXX: a complete high-accuracy line list for water (2018, unknown): “…allows the states file to be further updated in the eventuality that better (empirical) energies become available in the future (see, for example, Barber et al. (2014)). c© 2017 RAS, MNRAS 000, 1–16 2 3 1 15119.028 -0.008 0.02 0.014 0.00 4 1 0 15344.503 -0.012 -0.09 0.005 0.09 3 1 1 15347.956…”
H2O abundances and cloud properties in ten hot giant exoplanets (2018, methodology): “In particular, our CH4, HCN, and NH3 molecular line data are from EXOMOL (Tennyson et al. 2016; Yurchenko et al. 2011; Barber et al. 2014; Yurchenko & Tennyson 2014) and the line data for H2O, CO, and CO2 are obtained from HITEMP (Rothman et al. 2010).”