Mid-infrared observations of young stellar objects in the vicinity of sigma Orionis

Oliveira, Joana M.; van Loon, Jacco Th.

Abstract

We present new mid-infrared observations of objects in the vicinity of the O-star sigma Orionis, obtained with TIMMI-2 at ESO. By constraining their near- and mid-infrared spectral energy distributions, we established the nature of previously known IRAS sources and identified new mid-infrared sources as young stellar objects with circumstellar disks, likely massive members of the sigma Ori cluster. For two of these objects we have obtained spectroscopy in the 8-13 micron range in order to investigate the chemistry of the dust grains. TX Ori exhibits a typical silicate emission feature at 10 micron, with a feature at about 11.2 micron that we identify as due to crystalline olivine. The IRAS 05358-0238 spectrum is very unusual, with a weak silicate feature and structure in the range 10-12 micron that may be explained as due to self-absorbed forsterite. We also provide the first evidence for the presence of circumstellar disks in the jet sources Haro 5-39/HH 447, V510 Ori/HH 444 and V603 Ori/HH 445.

Citation

Oliveira, J. M., & van Loon, J. T. (2004). Mid-infrared observations of young stellar objects in the vicinity of sigma Orionis. Astronomy & Astrophysics, 418(2), https://doi.org/10.1051/0004-6361%3A20034518

• Journal Article Type: Article
• Acceptance Date: Jan 26, 2004
• Online Publication Date: Apr 9, 2004
• Publication Date: May 1, 2004
• Deposit Date: Jul 7, 2023
• Journal: Astronomy & Astrophysics
• Print ISSN: 0004-6361
• Electronic ISSN: 1432-0746
• Publisher: EDP Sciences
• Peer Reviewed: Peer Reviewed
• Volume: 418
• Issue: 2
• DOI: https://doi.org/10.1051/0004-6361%3A20034518
• Keywords: Astrophysics, stars: circumstellar matter / stars: pre-main sequence / stars: planetary systems: protoplanetary disks / infrared: stars / Galaxy: open clusters and associations: individual: σ Orionis