Shirley, Yancy L. and Claussen, Mark J. and Bourke, Tyler L. and Young, Chadwick H. and Blake, Geoffrey A. (2007) The Detection and Characterization of Centimeter Radio Continuum Emission from the Low-Mass Protostar L1014-IRS. Astrophysical Journal, 667 (1). pp. 329-339. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20100212-114424020
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Observations by the Cores to Disk Legacy Team with the Spitzer Space Telescope have identified a low-luminosity, mid-infrared source within the dense core, Lynds 1014, which was previously thought to harbor no internal source. Follow-up near-infrared and submillimeter interferometric observations have confirmed the protostellar nature of this source by detecting scattered light from an outflow cavity and a weak molecular outflow. In this paper, we report the detection of centimeter continuum emission with the VLA. The emission is characterized by a quiescent, unresolved 90 μJy 6 cm source within 0.2" of the Spitzer source. The spectral index of the quiescent component is α = 0.37 ± 0.34 between 6 and 3.6 cm. A factor of 2 increase in 6 cm emission was detected during one epoch and circular polarization was marginally detected at the 5 σ level with Stokes V/I = 48% ± 16%. We have searched for 22 GHz H2O maser emission toward L1014-IRS, but no masers were detected during seven epochs of observations between 2004 June and 2006 December. L1014-IRS appears to be a low-mass, accreting protostar, which exhibits centimeter emission from a thermal jet or a wind, with a variable nonthermal emission component. The quiescent cm radio emission is noticeably above the correlation of 3.6 and 6 cm luminosity versus bolometric luminosity, indicating more radio emission than expected. In this paper, we characterize the centimeter continuum emission in terms of observations of other low-mass protostars, including updated correlations of centimeter continuum emission with bolometric luminosity and outflow force, and discuss the implications of recent larger distance estimates on the physical attributes of the protostar and dense molecular core.
|Additional Information:||© 2007 American Astronomical Society. Print publication: Issue 1 (2007 September 20); received 2007 February 15; accepted for publication 2007 May 8. We wish to thank Sanjay Bhatnagar, Kumar Golap, and Debra Shepherd for their help with AIPS++, and are very grateful to Neal Evans and John Bieging for their suggestions. Finally, we would like to thank the referee for a very careful reading of the manuscript and comments that have greatly improved this paper.|
|Subject Keywords:||radiation mechanisms: non-thermal; radiation mechanisms: thermal; radio continuum: stars; stars: formation|
|Official Citation:||The Detection and Characterization of Centimeter Radio Continuum Emission from the Low-Mass Protostar L1014-IRS Yancy L. Shirley, Mark J. Claussen, Tyler L. Bourke, Chadwick H. Young, and Geoffrey A. Blake 2007 ApJ 667 329-339 doi: 10.1086/520570|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||12 Feb 2010 22:51|
|Last Modified:||26 Dec 2012 11:46|
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