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Hot methane spectra are important in environments ranging from flames to theatmospheres of cool stars and exoplanets. A new spectroscopic line list,10to10, for $^{12}$CH$_4$ containing almost 10 billion transitions ispresented. This comprehensive line list covers a broad spectroscopic range andis applicable for temperatures up to 1 500 K. Previous methane data areincomplete leading to underestimated opacities at short wavelengths andelevated temperatures. Use of 10to10 in models of the bright T4.5 brown dwarf2MASS 0559-14 leads to significantly better agreement with observations and instudies of the hot Jupiter exoplanet HD 189733b leads to up to a twentifoldincrease in methane abundance. It is demonstrated that proper inclusion of thehuge increase in hot transitions which are important at elevated temperaturesis crucial for accurate characterizations of atmospheres of brown dwarfs andexoplanets, especially when observed in the near-infrared.

The spectrum of hot methane in astronomical objects using a comprehensive computed line list