期刊
ASTROPHYSICAL JOURNAL
卷 684, 期 1, 页码 654-662出版社
IOP PUBLISHING LTD
DOI: 10.1086/590364
关键词
accretion, accretion disks; planetary systems : protoplanetary disks; stars : formation; stars : low-mass, brown dwarfs; stars : pre-main-sequence
资金
- National Science Foundation (NSF) [AST 05-44588]
- National Aeronautics and Space Administration
We have used images obtained with the Infrared Array Camera and the Multiband Imaging Photometer on board 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 24 mu m, 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 similar to 0.1 M(circle dot)).
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