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• W3100202411 endingPage "127" @default.
• W3100202411 startingPage "127" @default.
• W3100202411 abstract "We analyze very deep IRAC and MIPS photometry of $sim$ 12,500 members of the 14 Myr old Double Cluster, h and $chi$ Persei, building upon on our earlier, shallower Spitzer studies (Currie et al. 2007a, 2008a). Numerous likely members show infrared (IR) excesses at 8 {mu}m and 24 $mu$m indicative of circumstellar dust. The frequency of stars with 8 $mu$m excess is at least 2% for our entire sample, slightly lower (higher) for B/A stars (later type, lower-mass stars). Optical spectroscopy also identifies gas in about 2% of systems but with no clear trend between the presence of dust and gas. Spectral energy distribution (SED) modeling of 18 sources with detections at optical wavelengths through MIPS 24 $mu m$ reveals a diverse set of disk evolutionary states, including a high fraction of transitional disks, although similar data for all disk-bearing members would provide better constraints. We combine our results with those for other young clusters to study the global evolution of dust/gas disks. For nominal cluster ages, the e-folding times ($tau_{o}$) for the frequency of warm dust and gas are 2.75 Myr and 1.75 Myr respectively. Assuming a revised set of ages for some clusters (e.g. Bell et al. 2013), these timescales increase to 5.75 and 3.75 Myr, respectively, implying a significantly longer typical protoplanetary disk lifetime. The transitional disk duration, averaged over multiple evolutionary pathways, is $sim$ 1 Myr. Finally, 24 $mu$m excess frequencies for 4-6 M$_{odot}$ stars appear lower than for 1-2.5 M$_{odot}$ stars in other 10-30 Myr old clusters." @default.
• W3100202411 created "2020-11-23" @default.
• W3100202411 creator A5012069547 @default.
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• W3100202411 creator A5017318517 @default.
• W3100202411 creator A5034605167 @default.
• W3100202411 creator A5063050804 @default.
• W3100202411 date "2014-11-14" @default.
• W3100202411 modified "2023-09-26" @default.
• W3100202411 title "A DEEPSPITZERSURVEY OF CIRCUMSTELLAR DISKS IN THE YOUNG DOUBLE CLUSTER, h AND χ PERSEI" @default.
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