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- W1605175040 abstract "We obtained medium‐resolution infrared K‐band integral field spectroscopy with VLT/Sinfoni for the brown dwarf TWA 5 B, a companion to the weak‐line T Tauri star TWA 5 in the TW Hya association. We compare the final spectrum with theoretical model atmospheres from DRIFT‐PHOENIX (Dehn et al. 2007, Helling et al. 2008 ab, Witte 2008) for temperature from 2000 to 3100 K, gravity log g = 3.0, 3.5, and 4.0 (g in cm/s2) and metallicity −0.5, 0.0 (solar), and 0.5; we also varried the extinction towards TWA 5 B while searching for the best‐fit model between Av = 0.0 and 15 mag. The best‐fitting model spectrum yields the following parameters for TWA 5 B: Effective temperature Teff≃2800 K, metallicity [M/H]≃−0.5 (for metal content M), surface gravity log g≃4.0, and extinction Av = 0.0 mag. From these parameters and the distance towards TWA (∼65 pc), we can compute the mass of the brown dwarf to be roughly 25 Jupiter masses, but with large error bars including massive planets and low‐mass stars. Given its projected separation from the primary star, ∼123 AU, it has certainly more likely formed star‐like, i.e. being a brown dwarf companion." @default.
- W1605175040 created "2016-06-24" @default.
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- W1605175040 date "2009-01-01" @default.
- W1605175040 modified "2023-10-17" @default.
- W1605175040 title "Medium-resolution infrared integral field spectroscopy of the brown dwarf TWA 5 B" @default.
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- W1605175040 doi "https://doi.org/10.1063/1.3099248" @default.
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