A Rotating Gaseous Disk around the T Tauri Star GM Aurigae

David W Koerner, A. I. Sargent, S. V W Beckwith

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Abstract

We report the detection of a gaseous circumstellar disk around a relatively old T Tauri star, GM Aurigae. Maps at 4″ resolution in λ = 1.4-mm continuum emission and in the 13CO (2 → 1) line reveal unresolved and compact dust and gas associated with the stellar position and at the core of a larger rotating gaseous disk, 950 × 530 AU in extent. The mean velocity gradient across the disk, which is oriented along PA ≈ 50°, is consistent with rotation about an axis at PA = 140°. The structure observed in 13CO aperture synthesis maps agrees well with synthetic maps of the gas emission generated from a model. For a disk that is inclined 30° from face on, in Keplerian rotation, we derive a 0.80M⊙ central mass (star + disk), a systemic velocity, vhel, of 15.38 km sec-1, and a mass, 0.1M⊙. The spectral energy distribution of the dust continuum emission suggests a very similar mass, 0.09M⊙.

Original languageEnglish (US)
Pages (from-to)2-10
Number of pages9
JournalIcarus
Volume106
Issue number1
DOIs
StatePublished - Nov 1993
Externally publishedYes

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ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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