Discovery of an old photoevaporating disk in sigma Orionis

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.

Accepted by A&A; 4 pages, 2 figures

References in corpus (7)

• Spitzer Space Telescope study of disks in the young $\sigma$ Orionis cluster
• Which jet launching mechanism(s) in TTauri stars?
• The Spitzer c2d Survey of Weak-line T Tauri Stars II: New Constraints on the Timescale for Planet Building
• The Photoevaporation of Discs Around Young Stars in Massive Clusters
• Fitting the young main-sequence; distances, ages and age spreads
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• X-shooter spectroscopy of young stellar objects: I - Mass accretion rates of low-mass T Tauri stars in σOrionis
• New isolated planetary mass objects and the stellar and substellar mass function of the sigma Orionis cluster
• X-Shooter spectroscopy of young stellar objects: V - Slow winds in T Tauri stars
• Protoplanetary disc `isochrones' and the evolution of discs in the $\dot{M}-M_{\mathrm{d}}$ plane
• Probing stellar accretion with mid-infrared hydrogen lines
• Can habitable planets form in clustered environments?
• U-band study of the accretion properties in the sigma Ori star-forming region
• Planet formation via pebble accretion in externally photoevaporating discs
• An ALMA survey of $\lambda$ Orionis disks: from supernovae to planet formation
• A Herschel view of protoplanetary disks in the $\sigma$ Ori cluster
• The influence of the environment on the spin evolution of low-mass stars. I. External photoevaporation of circumstellar disks
• Testing external photoevaporation in the $\sigma$-Orionis cluster with spectroscopy and disk mass measurements
• [OI] 6300Å emission as a probe of external photoevaporation of protoplanetary discs
• Sigma Orionis IRS1 A and B: A Binary Containing a Proplyd
• Accretion and outflow in the proplyd-like objects near Cygnus OB2
• A New Look at Disk Winds and External Photoevaporation in the $\sigma$-Orionis Cluster
• PENELLOPE VII: Revisiting empirical relations to measure accretion luminosity