The Lifetime of Protoplanetary Disks Surrounding Intermediate-mass Stars

Details The Lifetime of Protoplanetary Disks Surrounding Intermediate-mass Stars The Lifetime of Protoplanetary Disks Surrounding Intermediate-mass Stars

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21943906y&link_type=abstract

American Astronomical Society, AAS Meeting #219, #439.06

Astronomy and Astrophysics

Astronomy

Scientific paper

To quantitatively and comprehensively study the lifetime of protoplanetary disks surrounding intermediate-mass stars (∼2-6M∼), we derived intermediate-mass disk fractions (IMDFs) using near-infrared JHK photometric data with a robust method with which the IMDF can be derived with high accuracy. We applied this method to all well-known nearby (D≤3kpc) and young (≤5Myr) clusters. The derived IMDFs appear to approximately follow an exponential decay with the cluster age. From the best fit of the decay curve, the characteristic disk lifetime for intermediate-mass stars is found to be 1.5±0.1Myr with an initial IMDF of 42±10%. The estimated disk lifetime is about half of those for low-mass stars (-3Myr), showing lifetime is proportional to M*^(-0.5±0.2), where M* is the stellar mass. This dependence is consistent with previous works that qualitatively suggest this dependence. However, we also found that the outer MIR-disk traced by Spitzer 8μm excess have ∼3Myr longer lifetime. Because such lifetime offset is not seen for low-mass stars, this may be a special characteristics for intermediate-mass stars. Because ground-based JHK imaging can achieve much higher sensitively with higher spatial resolution to resolve cluster stars than thermal IR imaging (e.g., using L-band or Spitzer MIR bands), our simple method can be applied to distant (D≥3kpc) clusters, enabling the study of environmental dependence of disk lifetime throughout the Galaxy and even for extra-galaxies.

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