Journal
ASTRONOMY & ASTROPHYSICS
Volume 405, Issue 3, Pages L33-L36Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20030811
Keywords
circumstellar matter; stars : formation; stars : individual : sigma Orionis (HD37468) planetary systems : protoplanetary disks; infrared : stars
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We report on the discovery of a mid-infrared source at a projected distance of only 1200 AU from the O9.5V star sigma Orionis. The spatially resolved, fan-shaped morphology and the presence of an ionization front, as well as evidence in the spectrum for processed dust grains, all suggest that it is a proto-planetary disk being dispersed by the intense ultraviolet radiation from sigma Orionis. We compute the mass budget and the photo-evaporation timescale, and discuss the possible nature of this remarkable object.
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