New low-mass stars and brown dwarfs with disks in the Chamaeleon i star-forming region

K. L. Luhman, A. A. Muench

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

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 μm, 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 Ṁ).

Original languageEnglish (US)
Pages (from-to)654-662
Number of pages9
JournalAstrophysical Journal
Volume684
Issue number1
DOIs
StatePublished - Sep 1 2008

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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