New Low-Mass Stars and Brown Dwarfs with Disks in the Chamaeleon I Star-Forming Region

Abstract

We have used images obtained with the Infrared Array Camera and the Multiband Imaging Photometer onboard the Spitzer Space Telescope to search for low-mass stars and brown dwarfs with circumstellar disks in the Chamaeleon I star-forming region. Through optical spectroscopy of sources with red colors in these data, we have identified seven new disk-bearing members of the cluster. Three of these objects are probably brown dwarfs according to their spectral types (M8, M8.5, M8-L0). Three of the other new members may have edge-on disks based on the shapes of their infrared spectral energy distributions. One of the possible edge-on systems has a steeply rising slope from 4.5 to 24um, indicating that it could be a class I source (star+disk+envelope) rather than a class II source (star+disk). If so, then it would be one of the least massive known class I protostars (M5.75, M~0.1 Msun).

Astrophysical Journal, in press

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• The end of star formation in Chamaeleon I ? A LABOCA census of starless and protostellar cores
• A Search for Companions to Brown Dwarfs in the Taurus and Chamaeleon Star Forming Regions
• Proper motions of young stars in Chamaeleon. I. A Virtual Observatory study of spectroscopically confirmed members
• What happened before? -- The disks around the precursors of young Herbig Ae/Be stars
• A survey for planetary-mass brown dwarfs in the Chamaeleon I star-forming region
• A Pulsation Search Among Young Brown Dwarfs and Very Low Mass Stars
• A Novel Survey for Young Substellar Objects with the W-band filter II. The Coolest and Lowest Mass Members of the Serpens-South Star-forming Region
• Spectral library of age-benchmark low-mass stars and brown dwarfs
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• Physical parameters of late M-type members of Chamaleon I and TW Hydrae Association: Dust settling, age dispersion and activity
• A Dusty M5 Binary in the beta Pictoris Moving Group
• An Incipient Debris Disk in the Chamaeleon I Cloud