Discovery of an old photoevaporating disk in sigma Orionis
Solar and Stellar Astrophysics
2015-05-13 v1
Abstract
The photoevaporation of circumstellar disks is a powerful process in the disk dissipation at the origin of the Orion proplyds. This Letter reports the first detection of a photoevaporating disk in the final but long-lasting phase of its evolution. The disk is associated to a low-mass T Tauri member of the sigma Orionis Cluster. It is characterized by a very low (if any) accretion rate and by a tenuous (Mloss ~ 10^{-9} Msun/yr) photoevaporation wind, which is unambiguously detected in the optical spectrum of the object. The wind emits strong forbidden lines of [SII] and [NII] because the low-mass star is close to a powerful source of ionizing photons, the O9.5 star sigma Ori.
Keywords
Cite
@article{arxiv.0902.0457,
title = {Discovery of an old photoevaporating disk in sigma Orionis},
author = {E. Rigliaco and A. Natta and S. Randich and G. Sacco},
journal= {arXiv preprint arXiv:0902.0457},
year = {2015}
}
Comments
Accepted by A&A; 4 pages, 2 figures