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An impressionist view of V Hydrae. When MATISSE paints Asymmetric Giant Blobs

Fuente: arXiv

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Bibliographic Details
Main Authors:	Planquart, L., Paladini, C., Jorissen, A., Escorza, A., Pantin, E., Drevon, J., Aringer, B., Baron, F., Chiavassa, A., Cruzalèbes, P., Danchi, W., De Beck, E., Groenewegen, M. A. T., Höfner, S., Hron, J., Khouri, T., Lopez, B., Lykou, F., Montarges, M., Nardetto, N., Ohnaka, K., Olofsson, H., Rau, G., Rosales-Guzmán, A., Sanchez-Bermudez, J., Scicluna, P., Siess, L., Thévenin, F., Van Eck, S., Vlemmings, W. H. T., Weigelt, G., Wittkowski, M.
Format:	Preprint
Published:	2024
Subjects:	Solar and Stellar Astrophysics Astrophysics of Galaxies
Online Access:	Acceder al recurso
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_version_	1866910546397233152
author	Planquart, L. Paladini, C. Jorissen, A. Escorza, A. Pantin, E. Drevon, J. Aringer, B. Baron, F. Chiavassa, A. Cruzalèbes, P. Danchi, W. De Beck, E. Groenewegen, M. A. T. Höfner, S. Hron, J. Khouri, T. Lopez, B. Lykou, F. Montarges, M. Nardetto, N. Ohnaka, K. Olofsson, H. Rau, G. Rosales-Guzmán, A. Sanchez-Bermudez, J. Scicluna, P. Siess, L. Thévenin, F. Van Eck, S. Vlemmings, W. H. T. Weigelt, G. Wittkowski, M.
author_facet	Planquart, L. Paladini, C. Jorissen, A. Escorza, A. Pantin, E. Drevon, J. Aringer, B. Baron, F. Chiavassa, A. Cruzalèbes, P. Danchi, W. De Beck, E. Groenewegen, M. A. T. Höfner, S. Hron, J. Khouri, T. Lopez, B. Lykou, F. Montarges, M. Nardetto, N. Ohnaka, K. Olofsson, H. Rau, G. Rosales-Guzmán, A. Sanchez-Bermudez, J. Scicluna, P. Siess, L. Thévenin, F. Van Eck, S. Vlemmings, W. H. T. Weigelt, G. Wittkowski, M.
contents	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 infrared bands. In the L-band, we detected an elongated shape of approximately 15 mas, likely to be of photospheric origin. In the N-band, we found a 20 mas extension North-East from the star, and perpendicular to the L-band elongated axis. The position angle and the size of the N-band extension match the prediction of the companion position at MATISSE epoch. By comparing MATISSE N-band with MIDI data, we deduce that the elongation axis in the N-band has rotated since the previous interferometric measurements 13 years ago, supporting the idea that the particle enhancement is related to the dusty clump moving along with the companion. The MATISSE images unveil the presence of a dust enhancement at the companion position, opening new doors for further analysis on the binary interaction with an AGB component.
format	Preprint
id	arxiv_https___arxiv_org_abs_2405_07821
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	An impressionist view of V Hydrae. When MATISSE paints Asymmetric Giant Blobs Planquart, L. Paladini, C. Jorissen, A. Escorza, A. Pantin, E. Drevon, J. Aringer, B. Baron, F. Chiavassa, A. Cruzalèbes, P. Danchi, W. De Beck, E. Groenewegen, M. A. T. Höfner, S. Hron, J. Khouri, T. Lopez, B. Lykou, F. Montarges, M. Nardetto, N. Ohnaka, K. Olofsson, H. Rau, G. Rosales-Guzmán, A. Sanchez-Bermudez, J. Scicluna, P. Siess, L. Thévenin, F. Van Eck, S. Vlemmings, W. H. T. Weigelt, G. Wittkowski, M. Solar and Stellar Astrophysics Astrophysics of Galaxies 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 infrared bands. In the L-band, we detected an elongated shape of approximately 15 mas, likely to be of photospheric origin. In the N-band, we found a 20 mas extension North-East from the star, and perpendicular to the L-band elongated axis. The position angle and the size of the N-band extension match the prediction of the companion position at MATISSE epoch. By comparing MATISSE N-band with MIDI data, we deduce that the elongation axis in the N-band has rotated since the previous interferometric measurements 13 years ago, supporting the idea that the particle enhancement is related to the dusty clump moving along with the companion. The MATISSE images unveil the presence of a dust enhancement at the companion position, opening new doors for further analysis on the binary interaction with an AGB component.
title	An impressionist view of V Hydrae. When MATISSE paints Asymmetric Giant Blobs
topic	Solar and Stellar Astrophysics Astrophysics of Galaxies
url	https://arxiv.org/abs/2405.07821