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Discovery of a dust cloud next to sigma Orionis

We report on the discovery of a mid-infrared source at a projected distance of only 1200 AU from the O9.5 V 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.

preprint2003arXivOpen access
Jacco Th. van LoonJoana M. Oliveira
astro-ph
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Open access2 authors1 topic
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Jacco Th. van LoonJoana M. Oliveira

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