49 new T dwarfs identified using methane imaging
نویسندگان
چکیده
منابع مشابه
Using Methane Imaging to Probe Brown Dwarfs
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We have updated our PHOENIX model atmospheres and theoretical spectra for ultracool dwarfs with new opacity data for methane based on line strength predictions with the STDS software. By extending the line list to rotational levels of J = 40 we can significantly improve the shape of the near-IR absorption features of CH4, and in addition find an enhanced blanketing effect, resulting in up to 50...
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We present first results from a major program of methane filter photometry for low-mass stars and brown dwarfs. The definition of a new methane filter photometric system is described. A recipe is provided for the differential calibration of methane imaging data using existing TwoMicron All Sky Survey (2MASS) photometry. We show that these filters are effective in discriminating T dwarfs from ot...
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We report the discovery of four field methane (“T”-type) brown dwarfs using 2MASS survey data. One additional methane dwarf, previously discovered by SDSS, was also identified. Near-infrared spectra clearly show the 1.6 and 2.2 μm CH4 absorption bands characteristic of objects with Teff∼< 1300 K, as well as broadened H2O bands at 1.4 and 1.9 μm. Comparing the spectra of these objects with Gl 22...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2015
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stv380