Detection of a Circumstellar Gas around DM Tauri: A Protoplanetary Disk around a Single Star?

Abstract

view Abstract Citations (18) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Detection of a Circumstellar Gas around DM Tauri: A Protoplanetary Disk around a Single Star? Handa, Toshihiro ; Miyama, Shoken M. ; Yamashita, Takuya ; Omodaka, Toshihiro ; Kitamura, Yoshimi ; Hayashi, Masahiko ; Onishi, Toshikazu ; Snell, Ronald L. ; Strom, Stephen E. ; Strom, Karen M. ; Skrutskie, Michael F. ; Edwards, Suzan ; Ohashi, Nagayoshi ; Sunada, Kazuyoshi ; Saito, Masao ; Fukui, Yasuo ; Mizuno, Akira ; Watanabe, Jun-Ichi ; Kataza, Hirokazu Abstract Sensitive molecular line observations carried out with the Nobeyama 45 m telescope have resulted in the detection of the 12CO (J = 1-0) and 13CO (J = 1-0) emission centered on the young, classical T Tauri star, DM Tau. The derived peak antenna temperatures are 0.3 K in 12CO and 0.1 K in 13CO. No C18O emission was detected at an upper limit (3 σ) of 45 mK. The emission feature has a line width of 1.7 km s-1 and is centered at VLSR = 5.9 km s-1, which coincides well with the reported radial velocity for DM Tau (5.9±2.1 km s-1). The 13CO profile shows a symmetric double peak, suggesting a Keplerian rotating disk. These observations suggest that the molecular gas is associated with and is most probably gravitationally bound to DM Tau. The derived radius of the gaseous disk is about 1000 AU using an optically thick disk model and a Keplerian rotating disk model. The gaseous mass is between 7 × 10-4 and 1 × 10-3 Msun from the 13CO intensity and the upper limit of C18O intensity. Our results suggest that molecular gas is depleted from the standard gas-to-dust mass ratio or that mass distribution in the disk is steeper than the standard law, r-1.5, although our observations cannot detect emission from an optically thick gaseous component inward of r < 100 AU, if the emission comes from a Keplerian rotating disk. Publication: The Astrophysical Journal Pub Date: August 1995 DOI: 10.1086/176107 Bibcode: 1995ApJ...449..894H Keywords: ISM: MOLECULES; STARS: INDIVIDUAL CONSTELLATION NAME: DM TAURI; RADIO LINES: ISM; STARS: CIRCUMSTELLAR MATTER; STARS: PRE-MAIN-SEQUENCE full text sources ADS | data products SIMBAD (4)