Identification of new transitional disk candidates in Lupus with Herschel

Abstract

New data from the Herschel Space Observatory are broadening our understanding of the physics and evolution of the outer regions of protoplanetary disks in star forming regions. In particular they prove to be useful to identify transitional disk candidates. The goals of this work are to complement the detections of disks and the identification of transitional disk candidates in the Lupus clouds with data from the Herschel Gould Belt Survey. We extracted photometry at 70, 100, 160, 250, 350 and 500 $\mu$m of all spectroscopically confirmed Class II members previously identified in the Lupus regions and analyzed their updated spectral energy distributions. We have detected 34 young disks in Lupus in at least one Herschel band, from an initial sample of 123 known members in the observed fields. Using the criteria defined in Ribas et al. (2013) we have identified five transitional disk candidates in the region. Three of them are new to the literature. Their PACS-70 $\mu$m fluxes are systematically higher than those of normal T Tauri stars in the same associations, as already found in T Cha and in the transitional disks in the Chamaeleon molecular cloud. Herschel efficiently complements mid-infrared surveys for identifying transitional disk candidates and confirms that these objects seem to have substantially different outer disks than the T Tauri stars in the same molecular clouds.

arXiv commentAccepted for publication in A&A. 16 pages, 9 figures, 7 tables

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• ALMA Survey of Lupus Protoplanetary Disks I: Dust and Gas Masses
• X-Shooter spectroscopy of young stellar objects in Lupus: Accretion properties of class II and transitional objects
• ALMA Survey of Lupus Protoplanetary Disks II: Gas Disk Radii
• Lupus disks with faint CO isotopologues: low gas/dust or large carbon depletion?
• Physical properties of dusty protoplanetary disks in Lupus: evidence for viscous evolution?
• The Disk Substructures at High Angular Resolution Project (DSHARP): IV. Characterizing substructures and interactions in disks around multiple star systems
• New insights into the nature of transition disks from a complete disk survey of the Lupus star forming region
• A New Look at T Tauri Star Forbidden Lines: MHD Driven Winds from the Inner Disk
• X-Shooter spectroscopy of young stellar objects in Lupus. Atmospheric parameters, membership and activity diagnostics
• The (w)hole survey: an unbiased sample study of transition disk candidates based on Spitzer catalogs
• The SEEDS High Contrast Imaging Survey of Exoplanets around Young Stellar Objects
• Far-infrared to millimeter data of protoplanetary disks: dust growth in the Taurus, Ophiuchus, and Chamaeleon I star-forming regions
• Measuring the ratio of the gas and dust emission radii of protoplanetary disks in the Lupus star-forming region
• V1094 Sco: a rare giant multi-ringed disk around a T Tauri star
• A catalogue of dense cores and young stellar objects in the Lupus complex based on Herschel Gould Belt Survey observations
• HST spectra reveal accretion in MY Lupi
• Demographics of disks around young very low-mass stars and brown dwarfs in Lupus
• Transition disks: the observational revolution from SEDs to imaging
• The ALMA Lupus protoplanetary disk survey: evidence for compact gas disks and molecular rings from CN
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• Infrared study of transitional disks in Ophiuchus with Herschel
• The ALMA Survey of Gas Evolution of PROtoplanetary Disks (AGE-PRO): III. Dust and Gas Disk Properties in the Lupus Star-forming Region
• Herschel Observations of Protoplanetary Disks in Lynds 1641
• Constraining the properties of transitional disks in Chamaeleon I with Herschel
• A Random Forest Approach to Identifying Young Stellar Object Candidates in the Lupus Star-Forming Region
• Chemical enrichment of the planet forming region as probed by accretion
• A study of accretion and disk diagnostics in the NGC 2264 cluster