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Identification of transitional disks in Chamaeleon with Herschel

Ribas, Á. and Merín, B. and Bouy, H. and Alves de Oliveira, C. and Ardila, D. R. and Puga, E. and Kóspál, Á. and Spezzi, L. and Cox, N. L. J. and Prusti, T. and Pilbratt, G. L. and André, Ph. and Matrà, L. and Vavrek, R. (2013) Identification of transitional disks in Chamaeleon with Herschel. Astronomy and Astrophysics, 552 . Art. No. A115. ISSN 0004-6361. doi:10.1051/0004-6361/201220960.

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Context. Transitional disks are circumstellar disks with inner holes that in some cases are produced by planets and/or substellar companions in these systems. For this reason, these disks are extremely important for the study of planetary system formation. Aims. The Herschel Space Observatory provides an unique opportunity for studying the outer regions of protoplanetary disks. In this work we update previous knowledge on the transitional disks in the Chamaeleon I and II regions with data from the Herschel Gould Belt Survey. Methods. We propose a new method for transitional disk classification based on the WISE 12 μm − PACS 70 μm color, together with inspection of the Herschel images. We applied this method to the population of Class II sources in the Chamaeleon region and studied the spectral energy distributions of the transitional disks in the sample. We also built the median spectral energy distribution of Class II objects in these regions for comparison with transitional disks. Results. The proposed method allows a clear separation of the known transitional disks from the Class II sources. We find six transitional disks, all previously known, and identify five objects previously thought to be transitional as possibly non-transitional. We find higher fluxes at the PACS wavelengths in the sample of transitional disks than those of Class II objects. Conclusions. We show the Herschel 70 μm band to be a robust and efficient tool for transitional disk identification. The sensitivity and spatial resolution of Herschel reveals a significant contamination level among the previously identified transitional disk candidates for the two regions, which calls for a revision of previous samples of transitional disks in other regions. The systematic excess found at the PACS bands could be either a result of the mechanism that produces the transitional phase, or an indication of different evolutionary paths for transitional disks and Class II sources.

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Matrà, L.0000-0003-4705-3188
Additional Information:© 2013 ESO. Article published by EDP Sciences. Received 19 December 2012; Accepted 11 March 2013. Published online 11 April 2013. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. We thank the referee for his/her constructive comments. This work has been possible thanks to the ESAC Science Operations Division research funds, support from the ESAC Space Science Faculty and of the Herschel Science Centre. N.L.J.C. acknowledges support from the Belgian Federal Science Policy Office via the ESA’s PRODEX Program. PACS has been developed by a consortium of institutes led by MPE (Germany) and including UVIE (Austria); KUL, CSL, IMEC (Belgium); CEA, OAMP (France); MPIA (Germany); IFSI, OAP/AOT, OAA/CAISMI, LENS, SISSA (Italy); IAC (Spain). This development has been supported by the funding agencies BMVIT (Austria), ESA-PRODEX (Belgium), CEA/CNES (France), DLR (Germany), ASI (Italy), and CICT/MCT (Spain). SPIRE has been developed by a consortium of institutes led by Cardiff Univ. (UK) and including Univ. Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, Univ. Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCL-MSSL, UKATC, Univ. Sussex (UK); and Caltech, JPL, NHSC, Univ. Colorado (USA). This development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy); MCINN (Spain); SNSB (Sweden); STFC (UK); and NASA (USA).This study also makes use of the data products from the Two Micron All Sky Survey (2MASS), a joint project of the University of Massachusetts and IPAC/Caltech, funded by NASA and the National Science Foundation; data products from the Wide-field Infrared Survey Explorer (WISE), a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory (JPL)/California Institute of Technology (Caltech); data produts from DENIS, a project partly funded by the SCIENCE and the HCM plans of the European Commission under grants CT920791 and CT940627; the NASA Infrared Processing and Analysis Center (IPAC) Science Archive; the SIMBAD database; and the Vizier service, operated at the Centre de Données astronomiques de Strasbourg, France.
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ESAC Science Operations Division research fundsUNSPECIFIED
ESAC Space Science FacultyUNSPECIFIED
Herschel Science CentreUNSPECIFIED
Belgian Federal Science Policy Office ESA-PRODEX ProgramUNSPECIFIED
Subject Keywords:stars: formation; stars: pre-main sequence; protoplanetary disks; planets and satellites: formation
Record Number:CaltechAUTHORS:20130606-114923924
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Official Citation:Identification of transitional disks in Chamaeleon with Herschel Á. Ribas, B. Merín, H. Bouy, C. Alves de Oliveira, D. R. Ardila, E. Puga, Á. Kóspál, L. Spezzi, N. L. J. Cox, T. Prusti, G. L. Pilbratt, Ph. André, L. Matrà and R. Vavrek A&A 552 A115 (2013) DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38834
Deposited On:07 Jun 2013 22:50
Last Modified:09 Nov 2021 23:40

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