J/ApJ/813/12ivo://CDS.VizieR/J/ApJ/813/12doi:10.26093/cds/vizier.18130012CDSHargreaves R.J.Bernath P.F.Bailey J.Dulick M.2017-01-23T22:00:00Z2016-03-11T15:16:57ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fratomic-physicsspectroscopyinfrared-astronomyHot methane is found in many "cool" sub-stellar astronomical sources including brown dwarfs and exoplanets, as well as in combustion environments on Earth. We report on the first high-resolution laboratory absorption spectra of hot methane at temperatures up to 1200K. Our observations are compared to the latest theoretical spectral predictions and recent brown dwarf spectra. The expectation that millions of weak absorption lines combine to form a continuum, not seen at room temperature, is confirmed. Our high-resolution transmittance spectra account for both the emission and absorption of methane at elevated temperatures. From these spectra, we obtain an empirical line list and continuum that is able to account for the absorption of methane in high temperature environments at both high and low resolution. Great advances have recently been made in the theoretical prediction of hot methane, and our experimental measurements highlight the progress made and the problems that still remain.2015ApJ...813...12Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/813/12CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/MNRAS/440/1649 : ExoMol line lists for CH4 (Yurchenko+, 2014)J/ApJ/757/46 : Hot methane (CH4) line list (Hargreaves+, 2012)J/ApJ/735/111 : NH_3_ line lists at high temperatures (Hargreaves+, 2011)J/ApJ/708/1452 : Quadratic F_ij_ force field in l-CH_4_^-^ (Senent+, 2010)J/ApJ/637/1067 : NIR spectral classification of T dwarfs (Burgasser+, 2006)J/other/ARA+A/43.195 : L and T dwarf stars (Kirkpatrick, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/813/12https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/813/12http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/813/12https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/813/12https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/813/12http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/813/12GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/ApJ/813/12/table3CH_4_ line listrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintT[200/900] Temperature in {deg}CdegCphys.temperatureintnu[2600/4884.1] Wavenumber (line position {bar}{nu})cm**-1em.freqdoubleS'Line intensity in units of cm/moleculespect.line.intensitydoubleE[0/17440]? Lower state energy E" (1)cm**-1phys.energy;phys.atmol.leveldoublenullableQCQuality code (1=E" is the most accurate) (2)meta.code.qualchar