Discovery of a dust cloud next to sigma Orionis

Details Discovery of a dust cloud next to sigma Orionis Discovery of a dust cloud next to sigma Orionis

2003-05-27

arxiv.org/abs/astro-ph/0305502v1

Astron.Astrophys.405:L33,2003

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A Letters: 4 pages, 3 figures

Scientific paper

10.1051/0004-6361:20030811

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.

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