An impressionist view of V Hydrae. When MATISSE paints Asymmetric Giant Blobs
L. Planquart, C. Paladini, A. Jorissen, A. Escorza, E. Pantin, J., Drevon, B. Aringer, F. Baron, A. Chiavassa, P. Cruzal\`ebes, W. Danchi, E. De, Beck, M. A. T. Groenewegen, S. H\"ofner, J. Hron, T. Khouri, B. Lopez, F., Lykou, M. Montarges, N. Nardetto, K. Ohnaka, H. Olofsson

TL;DR
This study uses VLTI/MATISSE observations to reveal asymmetric dust structures around V Hydrae, suggesting the presence of a binary companion influencing the circumstellar environment.
Contribution
First direct imaging evidence of a dusty companion around V Hydrae using interferometry, highlighting binary interaction effects in AGB star dust formation.
Findings
Detection of asymmetric elongated structures in infrared images
Identification of a dust enhancement at the companion's position
Rotation of the elongation axis over 13 years supports binary interaction
Abstract
Our purpose is to study the effect of binary companions located within the first 10 stellar radii from the primary AGB star. In this work, we target the mass-losing carbon star V Hydrae (V Hya), looking for signatures of its companion in the dust forming region of the atmosphere. The star was observed in the L- and N-bands with the VLTI/MATISSE instrument at low spectral resolution. We reconstructed images of V Hya's photosphere and surroundings using the two bands and compared our interferometric observables with VLTI/MIDI and VISIR archival data. To constrain the dust properties, we used DUSTY to model the spectral energy distribution. The star is dominated by dust emission in the L- and N- bands. The VISIR image confirms the presence of a large-scale dusty circumstellar envelope surrounding V Hya. The MATISSE reconstructed images show asymmetric and elongated structures in both…
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Taxonomy
TopicsMarine and environmental studies
