Ammonia-methane ratios from H-band near-infrared spectra of late-T and Y dwarfs

  title={Ammonia-methane ratios from H-band near-infrared spectra of late-T and Y dwarfs},
  author={Eduardo L. Mart'in and Jun-Yan Zhang and Pedro Esparza and F{\'e}lix Gracia and Jos{\'e} Luis Rasilla and Thomas Masseron and Adam J. Burgasser},
  journal={Astronomy \& Astrophysics},
Aims. Our goals are to investigate the relative absorption strengths of ammonia and methane using low-resolution H -band (1.5 − 1.7 microns) spectra obtained in the laboratory and compared with observational spectra of late-T and Y dwarfs, and to estimate what can be expected from the wide-angle low-resolution near-infrared spectroscopic survey that will be provided by the upcoming Euclid space mission. Methods. Gas cells containing ammonia and methane at atmospheric pressure were custom-made… 
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