Rapid Dissipation of Protoplanetary Disks in Ophiuchus

Abstract

We present the results of an age determination study for pre-main sequence stars in the Ophiuchus molecular cloud. The ages of eight pre-main sequence stars were estimated from surface gravities derived from high-resolution spectroscopy. The average age of the target stars was 0.7 Myr. By comparing the individual age and the near-infrared color excess, we found that color excess decreases gradually with a constant rate and the lifetime of the inner disk was determined to be 1.2 Myr. The estimated lifetime is nearly a half of the time compared to that of the pre-main sequence stars in the Taurus molecular cloud estimated with the same method. This result indicates that the disk evolution timescale depends on the environment of the star-forming region.

12 pages, 3 figures, accepted for publication in Publications of the Astronomical Society of Japan

References in corpus (4)

• A Submillimeter View of Circumstellar Dust Disks in $\rho$ Ophiuchus
• A Spitzer view of protoplanetary disks in the gamma Velorum cluster
• Near-IR Imaging Polarimetry toward a Bright-Rimmed Cloud: Magnetic Field in SFO 74
• Disk Dissipation Timescale of Pre-main Sequence Stars in Taurus

Cited by in corpus (4)

• Evolution of Protoplanetary Discs with Magnetically Driven Disc Winds
• Dust Dynamics in Protoplanetary Disk Winds Driven by Magneto-Rotational Turbulence: A Mechanism for Floating Dust Grains with Characteristic Sizes
• Protoplanetary and Transitional Disks in the Open Stellar Cluster IC 2395
• The Spectroscopic Variations of the FU Orionis Object V960 Mon