Medium-resolution infrared integral field spectroscopy of the brown dwarf TWA 5 B

Ralph Neuhaeuser*, Tobias O. B. Schmidt, Andreas Seifahrt, Ana Bedalov, Christiane Helling, Soeren Witte, Peter Hauschildt

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

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 (g in cm/s(2)) 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 A(V) - 0.0 and 15 nag. The best-fitting model spectrum yields the following parameters for TWA 5 B: Effective temperature T-eff similar or equal to 2800 K. tnctallicity [M/H] similar or equal to -0.5 (for metal content M), surface gravity log g similar or equal to 4.0 and extinction A(V) - 0.0 mag. From those parameters and the distance towards TWA (similar to 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, similar to 123 AU, it has certainly more likely formed star-like. i.e. being a brown dwarf companion.

Original languageEnglish
Title of host publicationCOOL STARS, STELLAR SYSTEMS AND THE SUN
EditorsE Stempels
PublisherAmerican Institute of Physics
Pages844-+
Number of pages2
ISBN (Print)978-0-7354-0627-8
Publication statusPublished - 2009
Event15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun - St Andrews, St Andrews, United Kingdom
Duration: 21 Jul 200825 Jul 2008

Publication series

NameAIP Conference Proceedings
PublisherAMER INST PHYSICS
Volume1094
ISSN (Print)0094-243X

Conference

Conference15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun
Country/TerritoryUnited Kingdom
CitySt Andrews
Period21/07/0825/07/08

Keywords

  • near-infrared
  • spectroscopy
  • star formation
  • brown dwarf
  • TWA 5B
  • HYDRAE ASSOCIATION
  • BINARY STAR
  • CANDIDATE
  • DUST
  • COMPANION
  • MASS

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