SIMBAD references

2006ApJ...651L..49C - Astrophys. J., 651, L49-L52 (2006/November-1)

Evidence for mass-dependent circumstellar disk evolution in the 5 Myr old upper Scorpius OB association.


Abstract (from CDS):

We present 4.5, 8, and 16 µm photometry from the Spitzer Space Telescope for 204 stars in the Upper Scorpius OB association. The data are used to investigate the frequency and properties of circumstellar disks around stars with masses between ∼0.1 and 20 Mat an age of ∼5 Myr. We identify 35 stars that have emission at 8 or 16 µm in excess of the stellar photosphere. The lower mass stars (∼0.1-1.2 M) appear surrounded by primordial optically thick disks based on the excess emission characteristics. Stars more massive than ∼1.8 Mhave lower fractional excess luminosities suggesting that the inner ∼10 AU of the disk has been largely depleted of primordial material. None of the G and F stars (∼1.2-1.8 M) in our sample have an infrared excess at wavelengths ≤16 µm. These results indicate that the mechanisms for dispersing primordial optically thick disks operate less efficiently, on average, for low-mass stars, and that longer timescales are available for the buildup of planetary systems in the terrestrial zone for stars with masses ≲1 M.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual (Upper Scorpius OB1) - Stars: Planetary Systems: Protoplanetary Disks - Stars: Pre-Main-Sequence

VizieR on-line data: <Available at CDS (J/ApJ/651/L49): table1.dat>

Simbad objects: 228

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