A Very Long Baseline Interferometry Detection of the Class I Protostar IRS 5 in Corona Australis

Abstract

Aims: Very Long Baseline Interferometry yields physical constraints on the compact radio emission of young stellar objects. At the same time, such measurements can be used for precise astrometric measurements of parallaxes and proper motions. Here, we aimed to make the first detections of very compact radio emission from class I protostars in the Corona Australis star-forming region. Methods: We have used the Long Baseline Array (LBA) to observe the protostars IRS 5 and IRS 7 in the Corona Australis star-forming region in three separate epochs Results: We report the first firm radio detection of a class I protostar using very long baseline interferometry. We have detected the previously known non-thermal source IRS 5b, part of a binary system. IRS 5a and IRS 5N were undetected, as were all sources in the IRS 7 region. Conclusions: These results underline the unusual nature of IRS 5b as a genuine protostar with confirmed non-thermal radio emission. Also, these observations highlight the potential of the LBA as a tool to provide precision astrometric measurements of individual young stellar objects in southern star-forming regions that are not accessible to the Very Long Baseline Array in the northern hemisphere.

5 pages, 3 figures, accepted in Astronomy & Astrophysics

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• Weak and Compact Radio Emission in Early High-Mass Star Forming Regions: I. VLA Observations
• The Gould Belt Very Large Array Survey IV: The Taurus-Auriga complex
• Time Monitoring of Radio Jets and Magnetospheres in the Nearby Young Stellar Cluster R Coronae Australis
• The Gould's Belt Very Large Array Survey II: The Serpens region
• The Gould's Belt Very Large Array Survey V: The Perseus Region
• Non-thermal radio continuum emission from young nearby stars
• Infrared dust bubble CS51 and its interaction with the surrounding interstellar medium
• The milliarcsecond-scale radio structure of AB Dor A
• A Dual-Band Centimetre Continuum Monitoring Survey of Young Stellar Objects in the Coronet Cluster