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Cold Disks: Spitzer Spectroscopy of Disks around Young Stars with Large Gaps

Brown, J. M. and Blake, G. A. and Dullemond, C. P. and Merín, B. and Augereau, J. C. and Boogert, A. C. A. and Evans, N. J., II and Geers, V. C. and Lahuis, F. and Kessler-Silacci, J. E. and Pontoppidan, K. M. and van Dishoeck, E. F. (2007) Cold Disks: Spitzer Spectroscopy of Disks around Young Stars with Large Gaps. Astrophysical Journal Letters, 664 (2). L107-L110. ISSN 2041-8205.

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We have identified four circumstellar disks with a deficit of dust emission from their inner 15-50 AU. All four stars have F-G spectral type and were uncovered as part of the Spitzer Space Telescope "Cores to Disks" Legacy Program Infrared Spectrograph (IRS) first-look survey of ~100 pre-main-sequence stars. Modeling of the spectral energy distributions indicates a reduction in dust density by factors of 100-1000 from disk radii between ~0.4 and 15-50 AU but with massive gas-rich disks at larger radii. This large contrast between the inner and outer disk has led us to use the term "cold disks" to distinguish these unusual systems. However, hot dust [(0.02-0.2)M_(moon)] is still present close to the central star (R ≤ 0.8 AU). We introduce the 30 μm/13 μm flux density ratio as a new diagnostic for identifying cold disks. The mechanisms for dust clearing over such large gaps are discussed. Although rare, cold disks are likely in transition from an optically thick to an optically thin state and so offer excellent laboratories for the study of planet formation.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle
Blake, G. A.0000-0003-0787-1610
Evans, N. J., II0000-0001-5175-1777
Pontoppidan, K. M.0000-0001-7552-1562
van Dishoeck, E. F.0000-0001-7591-1907
Additional Information:© 2007 The American Astronomical Society. Received 2006 December 1; accepted 2007 June 12; published 2007 July 17. Support for this work, part of the Spitzer Legacy Science Program, was provided by NASA through contracts 1224608, 1230779, and 1256316 issued by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407. Astrochemistry in Leiden is supported by a NWO Spinoza grant and a NOVA grant, and by the EU RTN-PLANETS (HPRN-CT-2002-00308). B. M. acknowledges the financial support from the Fundacion Ramon Areces (Spain). We thank the Lorentz Center in Leiden for hosting several meetings that contributed to this Letter.
Funding AgencyGrant Number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)UNSPECIFIED
Nederlandse Onderzoekschool voor de Astronomie (NOVA)UNSPECIFIED
European Research Training NetworkHPRN-CT-2002-00308
Fundacion Ramon ArecesUNSPECIFIED
Subject Keywords:planetary systems : protoplanetary disks; stars : pre-main-sequence
Issue or Number:2
Record Number:CaltechAUTHORS:20091027-130736915
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Official Citation:Cold Disks: Spitzer Spectroscopy of Disks around Young Stars with Large Gaps J. M. Brown, G. A. Blake, C. P. Dullemond, B. Merín, J. C. Augereau, A. C. A. Boogert, N. J. Evans II, V. C. Geers, F. Lahuis, J. E. Kessler-Silacci, K. M. Pontoppidan, and E. F. van Dishoeck 2007 ApJ 664 L107-L110 doi: 10.1086/520808
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16495
Deposited By: Tony Diaz
Deposited On:30 Oct 2009 17:13
Last Modified:09 Dec 2019 21:34

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