Spitzer-MIPS observations of the η Chamaeleontis young association

Thomas N. Gautier, L. M. Rebull, K. R. Stapelfeldt, A. Mainzer

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


We have mapped the η Chamaeleontis young stellar association in the far-infrared with the Multiband Imaging Photometer for Spitzer (MIPS) on the Spitzer Space Telescope. All 16 members within the map region were detected at 24 μm, along with five members at 70 μm and two at 160 μm. Ten stars show far-infrared excess emission indicating the presence of circumstellar disks; six of these have central clearings as evidenced by the onset of excess emission at λ > 5 μm. No new infrared-excess sources are identified among the 113 2MASS field stars with 24 μm photometry but not seen as X-ray sources, indicating that membership lists derived from X-ray surveys are reasonably complete. Circumstellar disks in the η Cha association span the range from 10-1 to 10-4 in their fractional infrared luminosity, with a median Ld/L* of 0.04. The presence of optically thick, optically thin, and intermediate optical depth disks within the same stellar group, in combination with the large fraction of disks with inner holes, indicates that the η Cha association represents a crucial stage in circumstellar disk evolution.

Original languageEnglish (US)
Pages (from-to)813-821
Number of pages9
JournalAstrophysical Journal
Issue number2
StatePublished - Aug 20 2008
Externally publishedYes


  • Circumstellar matter
  • Infrared: stars
  • Open clusters and associations: individual (η Chamaeleontis)
  • Planetary systems
  • Stars: pre-main-sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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