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Millimeter-wave Searches for Cold Dust and Molecular Gas around T Tauri Stars in MBM 12

Hogerheijde, Michiel R. and Jayawardana, Ray and Johnstone, Doug and Blake, Geoffrey A. and Kessler, Jacqueline E. (2002) Millimeter-wave Searches for Cold Dust and Molecular Gas around T Tauri Stars in MBM 12. Astronomical Journal, 124 (6). pp. 3387-3392. ISSN 0004-6256. doi:10.1086/344598.

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We report results of a sensitive search for cold dust and molecular gas in the disks around eight T Tauri stars in the high-latitude cloud MBM 12. Interferometric observations of 3 mm continuum emission in five fields containing six of the objects and literature values for the remaining two limit the disk masses to M_(disk) < 0.04–0.09 M_☉ (gas plus dust), for a gas-to-dust mass ratio of 100 and a distance of 275 pc. By co-adding the 3 mm data of our five fields, we set an upper limit to the average disk mass M_(disk)(N = 5) < 0.03 M_☉. Simultaneous observation of the CS J = 2–1 and the N_2H^+ 1–0 lines show no emission. Single-dish observations of the ^(13)CO 2–1 line limit the disk mass to (5–10) × 10^(-4) M_☉ for a standard CO abundance of 2 × 10^(-4). Depletion of CO by up to 2 orders of magnitude through freezing out or photodissociation can reconcile these limits. These mass limits lie within the range found in the Taurus-Auriga and ρ Oph star-forming regions (0.001–0.3 M_☉) and preclude conclusions about possible decrease in disk mass over the 1–2 Myr age range spanned by the latter two regions and MBM 12. Our observations can exclude the presence in MBM 12 of T Tauri stars with relatively bright and massive disks such as T Tau, DG Tau, and GG Tau.

Item Type:Article
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Johnstone, Doug0000-0002-6773-459X
Blake, Geoffrey A.0000-0003-0787-1610
Additional Information:© 2002 American Astronomical Society. Received 2002 April 15; accepted 2002 September 4. We wish to thank the staff of OVRO and JCMT, and Henry Matthews in particular, for their outstanding support. Paola D’Alessio, Erik Mamajek, Michael Meyer, and James Muzerolle are thanked for useful discussions. The referee provided many useful comments that significantly improved the paper. At the University of California, Berkeley, the research of M. R. H. and R. J. was supported by the Miller Institute for Basic Research in Science. This work was supported in part by NASA Origins grant NAG 5-11905 to R. J.
Funding AgencyGrant Number
Miller Institute for Basic Research in ScienceUNSPECIFIED
NASANAG 5-11905
Subject Keywords:circumstellar matter; ISM: clouds; ISM: individual (MBM 12); stars: formation; stars: pre-main sequence
Issue or Number:6
Record Number:CaltechAUTHORS:20120918-145420083
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Official Citation:Millimeter-wave Searches for Cold Dust and Molecular Gas around T Tauri Stars in MBM 12 Michiel R. Hogerheijde et al. 2002 The Astronomical Journal 124 3387
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34188
Deposited By: Ruth Sustaita
Deposited On:18 Sep 2012 22:15
Last Modified:09 Nov 2021 23:07

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