Subtle signatures of multiplicity in late-type dwarf spectra: The unresolved M8.5 + T5 binary 2MASS J03202839-0446358
Evidence is presented that 2MASS J03202839-0446358, a late-type dwarf with discrepant optical (M8:) and near-infrared (L1) spectral types, is an as-yet unresolved stellar/brown dwarf binary with late-type M dwarf and T dwarf components. This conclusion is based on low-resolution, near-infrared spectroscopy that reveals a subtle but distinctive absorption feature at 1.6 μm. The feature, which is also present in the combined light spectrum of the M8.5 + T6 binary SCR 1845-6357, arises from the...[Show more]
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|Source:||Astrophysical Journal, The|
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