Circumstellar Disk Lifetimes In Numerous Galactic Young Stellar Clusters
Alexander J. W. Richert (1), Konstantin V. Getman (1), Eric D., Feigelson (1), Michael A. Kuhn (2,3), Patrick S. Broos (1), Matthew S. Povich, (4), Matthew R. Bate (5), Gordon P. Garmire (6) ((1) Pennsylvania State, University, (2) Universidad de Valparaiso

TL;DR
This study analyzes the lifetimes of circumstellar disks in 69 young stellar clusters using homogeneous photometric data, revealing that disk longevity estimates depend heavily on the choice of pre-main sequence models and find no significant variation with stellar mass below 2 solar masses.
Contribution
It provides the largest homogeneous dataset for disk longevity, compares different PMS models, and assesses the influence of initial conditions and environment on disk lifetimes.
Findings
Disk half-life varies from 1.3 to 3.5 Myr depending on PMS model used.
No significant disk fraction variation with stellar mass below 2 solar masses.
Disk longevity estimates are sensitive to the choice of PMS evolutionary models.
Abstract
Photometric detections of dust circumstellar disks around pre-main sequence (PMS) stars, coupled with estimates of stellar ages, provide constraints on the time available for planet formation. Most previous studies on disk longevity, starting with Haisch, Lada & Lada (2001), use star samples from PMS clusters but do not consider datasets with homogeneous photometric sensitivities and/or ages placed on a uniform timescale. Here we conduct the largest study to date of the longevity of inner dust disks using X-ray and 1--8 micrometre infrared photometry from the MYStIX and SFiNCs projects for 69 young clusters in 32 nearby star-forming regions with ages t<=5 Myr. Cluster ages are derived by combining the empirical AgeJX method with PMS evolutionary models, which treat dynamo-generated magnetic fields in different ways. Leveraging X-ray data to identify disk-free objects, we impose similar…
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