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    PROTOPLANETARY AND TRANSITIONAL DISKS IN THE OPEN STELLAR CLUSTER IC 2395

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    Author
    Balog, Zoltan cc
    Siegler, Nick
    Rieke, George H. cc
    Kiss, L. L. cc
    Muzerolle, James
    Gutermuth, Robert A. cc
    Bell, Cameron P. M.
    Vinkó, J.
    Su, Kate Y. L. cc
    Young, E. T.
    Gáspár, András cc
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    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2016-11-18
    Keywords
    circumstellar matter
    infrared: stars
    open clusters and associations: individual (IC 2395)
    stars: premain sequence
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    PROTOPLANETARY AND TRANSITIONAL DISKS IN THE OPEN STELLAR CLUSTER IC 2395 2016, 832 (1):87 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    Rights
    © 2016. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We present new deep UBVRI images and high-resolution multi-object optical spectroscopy of the young (similar to 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 mu m. Our infrared observations allow us to detect dust in circumstellar disks originating over a typical range of radii from similar to 0.1 to similar 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 similar to 1 to similar to 18 Myr. We find that the number of disks in the transitional phase as a fraction of the total with strong 24 mu m excesses ([8] - [24]. 1.5) increases from (8.4. +/- 1.3)% at similar to 3 Myr to (46. +/- 5)% at similar to 10 Myr. Alternative definitions of transitional disks will yield different percentages but should show the same trend.
    ISSN
    1538-4357
    DOI
    10.3847/0004-637X/832/1/87
    Version
    Final published version
    Sponsors
    NASA [1255094]; Lendulet Young Researchers Program of the Hungarian Academy of Sciences; National Aeronautics and Space Administration; National Science Foundation
    Additional Links
    http://stacks.iop.org/0004-637X/832/i=1/a=87?key=crossref.9b8ca322718816b0cfe7951f23b999c2
    ae974a485f413a2113503eed53cd6c53
    10.3847/0004-637X/832/1/87
    Scopus Count
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    UA Faculty Publications

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