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.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- October 2015
- DOI:
- 10.1093/pasj/psv062
- arXiv:
- arXiv:1506.04363
- Bibcode:
- 2015PASJ...67...87T
- Keywords:
-
- protoplanetary disks;
- stars: formation;
- stars: pre-main sequence;
- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - Earth and Planetary Astrophysics
- E-Print:
- 12 pages, 3 figures, accepted for publication in Publications of the Astronomical Society of Japan