A K-nearest-neighbors model trained on noise-added standard spectra classifies M0-T9 cool dwarfs within one subtype 95.5% of the time and assigns gravity or metallicity class correctly 89.5% of the time on 1,300 held-out spectra.
EROS 2 proper motion survey: a field brown dwarf and an L dwarf companion to LHS 102
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abstract
We report the discovery of two L dwarfs (the new spectral class defined for dwarfs cooler than the M type) in a two-epoch CCD proper motion survey of 413 square degrees, complemented by infrared photometry from DENIS. One of them has a strong lithium line and is therefore a brown dwarf. The other is a common proper motion companion to the mid-M dwarf LHS 102 (GJ 1001), which has a well determined trigonometric parallax. LHS 102B is thus the coolest L dwarf of known distance and luminosity. Its infrared absolute photometry are very well reproduced by the Allard et al DUSTY models.
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Classifying Cool Dwarfs: Comprehensive Spectral Typing of Field and Peculiar Dwarfs Using Machine Learning
A K-nearest-neighbors model trained on noise-added standard spectra classifies M0-T9 cool dwarfs within one subtype 95.5% of the time and assigns gravity or metallicity class correctly 89.5% of the time on 1,300 held-out spectra.