PROTOPLANETARY and TRANSITIONAL DISKS in the OPEN STELLAR CLUSTER IC 2395

Zoltan Balog, Nick Siegler, G. H. Rieke, L. L. Kiss, James Muzerolle, R. A. Gutermuth, Cameron P.M. Bell, J. Vinkó, K. Y.L. Su, E. T. Young, András Gáspár

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Abstract

We present new deep UBVRI images and high-resolution multi-object optical spectroscopy of the young (∼6-10 Myr old), relatively nearby (800 pc) open cluster IC 2395. We identify nearly 300 cluster members and use the photometry to estimate their spectral types, which extend from early B to middle M. We also present an infrared imaging survey of the central region using the IRAC and MIPS instruments on board the Spitzer Space Telescope, covering the wavelength range from 3.6 to 24 μm. Our infrared observations allow us to detect dust in circumstellar disks originating over a typical range of radii from ∼0.1 to ∼10 au from the central star. We identify 18 Class II, 8 transitional disk, and 23 debris disk candidates, respectively, 6.5%, 2.9%, and 8.3% of the cluster members with appropriate data. We apply the same criteria for transitional disk identification to 19 other stellar clusters and associations spanning ages from ∼1 to ∼18 Myr. We find that the number of disks in the transitional phase as a fraction of the total with strong 24 μm excesses ([8] - [24] ≥ 1.5) increases from (8.4 ±1.3)% at ∼3 Myr to (46 ±5)% at ∼10 Myr. Alternative definitions of transitional disks will yield different percentages but should show the same trend.

Original languageEnglish
Article number87
JournalAstrophysical Journal
Volume832
Issue number1
DOIs
Publication statusPublished - Nov 20 2016

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Keywords

  • circumstellar matter
  • infrared: stars
  • open clusters and associations: individual (IC 2395)
  • stars: premain sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Balog, Z., Siegler, N., Rieke, G. H., Kiss, L. L., Muzerolle, J., Gutermuth, R. A., Bell, C. P. M., Vinkó, J., Su, K. Y. L., Young, E. T., & Gáspár, A. (2016). PROTOPLANETARY and TRANSITIONAL DISKS in the OPEN STELLAR CLUSTER IC 2395. Astrophysical Journal, 832(1), [87]. https://doi.org/10.3847/0004-637X/832/1/87