Resolved Mid-Infrared Emission Around AB Aur and V892 Tau with Adaptive Optics Nulling Interferometric Observations

Abstract

We present the results of adaptive optics nulling interferometric observations of two Herbig Ae stars, AB Aur and V892 Tau. Our observations at 10.3 microns show resolved circumstellar emission from both sources. Further analysis of the AB Aur emission suggests that there is an inclined disk surrounding the star. The diameter of the disk is derived to be 24 to 30 AU with an inclination of 45 to 65 degrees from face-on, and a major-axis PA of 30 +/- 15 degrees (E of N). Differences in the physical characteristics between the mid-IR emission and emission at other wavelengths (near-IR and millimeter), found in previous studies, suggest a complex structure for AB Aur's circumstellar environment, which may not be explained by a disk alone. The similarity in the observed size of AB Aur's resolved emission and that of another Herbig Ae star, HD 100546, is likely coincidental, as their respective evolutionary states and spectral energy distributions suggest significantly different circumstellar environments.

arXiv comment11 pages, 1 figure, Accepted for publication in ApJ Letters

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• Discovery of a Circumbinary Disk around Herbig Ae/Be system v892 Tau
• Observations of Herbig Ae Disks with Nulling Interferometry
• Mid-Infrared Imaging of the Herbig Ae Star AB Aurigae: Extended Emission on Several Scales
• Herbig AeBe stars: Multiplicity and consequences
• Pre-transitional disk nature of the AB Aur disk
• Confronting Standard Models of Proto--Planetary Disks With New Mid--Infrared Sizes from the Keck Interferometer
• Diamonds and PAHs in the Circumstellar Environment of the Herbig Ae/Be Star Elias 1
• Probing dust and grain growth in the optically thick circumbinary ring of V892 Tau