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Herschel Far-infrared Photometric Monitoring of Protostars in the Orion Nebula Cluster

Billot, N. and Morales-Calderón, M. and Stauffer, J. R. and Megeath, S. T. and Whitney, B. (2012) Herschel Far-infrared Photometric Monitoring of Protostars in the Orion Nebula Cluster. Astrophysical Journal Letters, 753 (2). Art. No. L35. ISSN 2041-8205. doi:10.1088/2041-8205/753/2/L35.

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We have obtained time series observations of the Orion Nebula Cluster at 70 μm and 160 μm from the Herschel/PACS Photometer. This represents the first wide-field far-infrared photometric monitoring of a young star-forming region. The acquired 35' × 35' maps show complex extended structures, with unprecedented detail, that trace the interaction between the molecular gas and the young hot stars. We detect 43 protostars, most of which are situated along the integral-shaped filament extending from the Orion nebula, through OMC 2 and OMC 3. We present high-reliability light curves for some of these objects using the first six epochs of our observing program spread over 6 weeks. We find amplitude variations in excess of 20% for a fraction of the detected protostars over periods as short as a few weeks. This is inconsistent with the dynamical timescales of cool far-IR emitting material that orbits at hundreds of AU from the protostar, and it suggests that the mechanism(s) responsible for the observed variability originates from the inner region of the protostars, likely driven by variable mass accretion.

Item Type:Article
Related URLs:
URLURL TypeDescription
Stauffer, J. R.0000-0003-3595-7382
Megeath, S. T.0000-0001-7629-3573
Additional Information:© 2012 American Astronomical Society. Received 2012 April 3; accepted 2012 June 11; published 2012 June 22. This work is based on observations made with Herschel, an European Space Agency Cornerstone Mission with significant participation by NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech. This research has made use of NASA’s Astrophysics Data System. Facility: Herschel
Funding AgencyGrant Number
Subject Keywords:infrared: stars; stars: formation; stars: protostars; stars: variables: general
Issue or Number:2
Record Number:CaltechAUTHORS:20120731-150406233
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Official Citation:Herschel Far-infrared Photometric Monitoring of Protostars in the Orion Nebula Cluster N. Billot et al. 2012 ApJ 753 L35
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32821
Deposited By: Ruth Sustaita
Deposited On:01 Aug 2012 14:57
Last Modified:09 Nov 2021 21:30

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