SPITZER IRS SPECTRA OF DEBRIS DISKS IN THE SCORPIUS–CENTAURUS OB ASSOCIATION

Journal Article · Sat Aug 01 04:00:00 EDT 2015 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/808/2/167· OSTI ID:22525674

Jang-Condell, Hannah ^[1]; Chen, Christine H.; Mittal, Tushar; Lisse, Carey M. ^[2]; Manoj, P. ^[3]; Watson, Dan ^[4]; Nesvold, Erika; Kuchner, Marc ^[5]

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1. Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071 (United States)
2. Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218 (United States)
3. Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Rd., Mumbai 400005 (India)
4. Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627 (United States)
5. NASA Goddard Space Flight Center, Greenbelt, MD (United States)

We analyze spectra obtained with the Spitzer Infrared Spectrograph (IRS) of 110 B-, A-, F-, and G-type stars with optically thin infrared excess in the Scorpius–Centaurus OB association. The ages of these stars range from 11 to 17 Myr. We fit the infrared excesses observed in these sources by Spitzer IRS and the Multiband Imaging Photometer for Spitzer (MIPS) to simple dust models according to Mie theory. We find that nearly all of the objects in our study can be fit by one or two belts of dust. Dust around lower mass stars appears to be closer in than around higher mass stars, particularly for the warm dust component in the two-belt systems, suggesting a mass-dependent evolution of debris disks around young stars. For those objects with stellar companions, all dust distances are consistent with truncation of the debris disk by the binary companion. The gaps between several of the two-belt systems can place limits on the planets that might lie between the belts, potentially constraining the mass and locations of planets that may be forming around these stars.

• OSTI ID: 22525674
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 808; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COSMIC DUST
DISTANCE
MASS
PHOTOMETRY
PLANETS
STAR CLUSTERS
STAR EVOLUTION
STARS