An Ionized Outflow from AB Aur, a Herbig Ae Star with a Transitional Disk

Abstract

AB Aur is a Herbig Ae star with a transitional disk. Transitional disks present substantial dust clearing in their inner regions, most probably because of the formation of one or more planets, although other explanations are still viable. In transitional objects, accretion is found to be about an order of magnitude smaller than in classical full disks. Since accretion is believed to be correlated with outflow activity, centimeter free-free jets are expected to be present in association with these systems, at weaker levels than in classical protoplanetary (full) systems. We present new observations of the centimeter radio emission associated with the inner regions of AB Aur and conclude that the morphology, orientation, spectral index and lack of temporal variability of the centimeter source imply the presence of a collimated, ionized outflow. The radio luminosity of this radio jet is, however, about 20 times smaller than that expected for a classical system of similar bolometric luminosity. We conclude that centimeter continuum emission is present in association with stars with transitional disks, but at levels than are becoming detectable only with the upgraded radio arrays. On the other hand, assuming that the jet velocity is 300 km s${}^{-1}$, we find that the ratio of mass loss rate to accretion rate in AB Aur is $\sim$0.1, similar to that found for less evolved systems.

arXiv comment12 pages, 3 figures, accepted in The Astrophysical Journal Letters

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• The Gould Belt Very Large Array Survey IV: The Taurus-Auriga complex
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• An Ordered Magnetic Field in the Protoplanetary Disk of AB Aur Revealed by Mid-Infrared Polarimetry
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• 3.3 cm JVLA observations of transitional disks: searching for centimeter pebbles
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• Pebbles in an Embedded Protostellar Disk: The Case of CB26
• Gas accretion within the dust cavity in AB Aur
• Multi-frequency analysis of the ALMA and VLA high resolution continuum observations of the substructured disc around CI Tau. Preference for sub-mm-sized low-porosity amorphous carbon grains
• Testing the Potential for Radio Variability in Disks around T Tauri Stars with Observations and Chemical Modeling
• A high-resolution radio study of the L1551 IRS 5 and L1551 NE jets
• The Radio Jet Associated with the Multiple V380 Ori System
• A Dual-Band Centimetre Continuum Monitoring Survey of Young Stellar Objects in the Coronet Cluster