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ALMA Observations of ρ-Oph 102: Grain Growth and Molecular Gas in the Disk around a Young Brown Dwarf

Ricci, L. and Testi, L. and Natta, A. and Scholz, A. and de Gregorio-Monsalvo, I. (2012) ALMA Observations of ρ-Oph 102: Grain Growth and Molecular Gas in the Disk around a Young Brown Dwarf. Astrophysical Journal Letters, 761 (2). Art. No. L20. ISSN 2041-8205. doi:10.1088/2041-8205/761/2/L20.

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We present ALMA continuum and spectral line observations of the young brown dwarf ρ-Oph 102 at about 0.89 mm and 3.2 mm. We detect dust emission from the disk at these wavelengths and derive an upper limit on the radius of the dusty disk of ~40 AU. The derived variation of the dust opacity with frequency in the millimeter (mm) provides evidence for the presence of mm-sized grains in the disk's outer regions. This result demonstrates that mm-sized grains are found even in the low-density environments of brown dwarf disks and challenges our current understanding of dust evolution in disks. The CO map at 345 GHz clearly reveals molecular gas emission at the location of the brown dwarf, indicating a gas-rich disk as typically found for disks surrounding young pre-main-sequence stars. We derive a disk mass of ~0.3%-1% of the mass of the central brown dwarf, similar to the typical values found for disks around more massive young stars.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Testi, L.0000-0003-1859-3070
Scholz, A.0000-0001-8993-5053
Additional Information:© 2012 American Astronomical Society. Received 2012 October 10; accepted 2012 October 28; published 2012 November 30. We thank P. Pinilla, T. Birnstiel, and J. Carpenter for helpful comments, and E. van Kampen and ESO ARC for technical support. L.R. acknowledges support from the ESO Scientific Visitor Programme. I.G. is supported by the Spanish MINECO grant AYA2011-30228-C03-01 (co-funded with FEDER fund). This Letter makes use of the following ALMA data: ADS/JAO.ALMA#2011.0.00259.S. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
Funding AgencyGrant Number
European Southern Observatory (ESO)UNSPECIFIED
Ministerio de Economía, Industria y Competitividad (MINECO)AYA2011-30228-C03-01
Fondo Europeo de Desarrollo Regional (FEDER)UNSPECIFIED
Subject Keywords:brown dwarfs; circumstellar matter; planets and satellites: formation; stars: individual (ρ-Oph 102); submillimeter: stars
Issue or Number:2
Record Number:CaltechAUTHORS:20130118-080822355
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Official Citation:ALMA Observations of ρ-Oph 102: Grain Growth and Molecular Gas in the Disk around a Young Brown Dwarf L. Ricci et al. 2012 ApJ 761 L20
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36461
Deposited By: Ruth Sustaita
Deposited On:18 Jan 2013 16:30
Last Modified:09 Nov 2021 23:22

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