Discovery of an old photoevaporating disk in σ Orionis

Details Discovery of an old photoevaporating disk in σ Orionis Discovery of an old photoevaporating disk in σ Orionis

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...495l..13r&link_type=abstract

Astronomy and Astrophysics, Volume 495, Issue 2, 2009, pp.L13-L16

Astronomy and Astrophysics

Astrophysics

3

Stars: Formation, Accretion, Accretion Disks

Scientific paper

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 σ Ori Cluster. It is characterized by a very low (if any) accretion rate and by a tenuous (dot M_loss ˜ 10-9 M_&sun;/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 σ Ori.
Based on observations collected at the European Southern Observatory, Chile. Program 074.D-0136(A).

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