Short Lifetime of Protoplanetary Disks in Low-metallicity Environments

Details Short Lifetime of Protoplanetary Disks in Low-metallicity Environments Short Lifetime of Protoplanetary Disks in Low-metallicity Environments

2010-10-08

arxiv.org/abs/1010.1668v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

5 pages, 1 figure, and 2 tables. Accepted for publication in The Astrophysical Journal Letters

Scientific paper

We studied near-infrared disk fractions of six young clusters in the low-metallicity environments with [O/H$] \sim -0.7$ using deep $JHK$ images with Subaru 8.2\,m telescope. We found that disk fraction of the low-metallicity clusters declines rapidly in $<$1\,Myr, which is much faster than the $\sim$5--7\,Myr observed for the solar-metallicity clusters, suggesting that disk lifetime shortens with decreasing metallicity possibly with an $\sim$$10^Z$ dependence. Since the shorter disk lifetime reduces the time available for planet formation, this could be one of the major reasons for the strong planet--metallicity correlation. Although more quantitative observational and theoretical assessments are necessary, our results present the first direct observational evidence that can contribute to explaining the planet--metallicity correlation.

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