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25 April 2024

» arxiv » 1305.6912

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Adaptive Optics Imaging of VY Canis Majoris at 2 - 5 micron with LBT/LMIRCam
Dinesh P. Shenoy ; Terry J. Jones ; Roberta M. Humphreys ; Massimo Marengo ; Jarron M. Leisenring ; Matthew J. Nelson ; John C. Wilson ; Michael F. Skrutskie ; Philip M. Hinz ; William F. Hoffmann ; Vanessa Bailey ; Andrew Skemer ; Timothy Rodigas ; Vidhya Vaitheeswaran ;
Date:	29 May 2013
Abstract:	We present adaptive optics images of the extreme red supergiant VY Canis Majoris in the Ks, L’ and M bands (2.15 to 4.8 micron) made with LMIRCam on the Large Binocular Telescope (LBT). The peculiar "Southwest Clump" previously imaged from 1 to 2.2 micron appears prominently in all three filters. We rule out thermal emission as a source of its brightness, which we attribute to scattering alone. We model its brightness as optically thick scattering from silicate dust grains using typical size distributions. We find a lower limit mass of approximately 5E-03 Msun in this single feature. The presence of the Clump as a distinct feature with no apparent counterpart on the other side of the star is suggestive of an ejection event from a localized region of the star and is consistent with VY CMa’s history of asymmetric high mass loss events.
Source:	arXiv, 1305.6912
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