An impressionist view of V Hydrae: When MATISSE paints asymmetric giant blobs

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An impressionist view of V Hydrae: When MATISSE paints asymmetric giant blobs

Planquart, L. (author): European Southern Observatory Santiago,Université libre de Bruxelles (ULB)

Paladini, C. (author): European Southern Observatory Santiago

Jorissen, A. (author): Université libre de Bruxelles (ULB)

Escorza, A. (author): European Southern Observatory Santiago,Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias

Pantin, E. (author): Université Paris-Saclay,University Paris-Saclay

Drevon, J. (author): Observatoire de la Cote d'Azur,European Southern Observatory Santiago

Aringer, B. (author): Universität Wien,University of Vienna

Baron, F. (author): Georgia State University

Chiavassa, A. (author): Observatoire de la Cote d'Azur

Cruzalèbes, P. (author): Observatoire de la Cote d'Azur

Danchi, W. (author): NASA Goddard Space Flight Center

De Beck, Elvire, 1985 (author): Chalmers tekniska högskola,Chalmers University of Technology

Groenewegen, M. A. T. (author): Royal Observatory of Belgium

Höfner, S. (author): Uppsala universitet,Uppsala University

Hron, J. (author): Universität Wien,University of Vienna

Khouri, Theo, 1985 (author): Chalmers tekniska högskola,Chalmers University of Technology

Lopez, B. (author): Observatoire de la Cote d'Azur

Lykou, F. (author): Magyar Tudomanyos Akademia,Hungarian Academy of Sciences

Montargès, M. (author): Observatoire de Paris,Paris Observatory

Nardetto, N. (author): Observatoire de la Cote d'Azur

Ohnaka, K. (author): Universidad Andrés Bello

Olofsson, Hans, 1952 (author): Chalmers tekniska högskola,Chalmers University of Technology

Rau, G. (author): NASA Goddard Space Flight Center

Rosales-Guzmán, A. (author): Universidad Nacional Autónoma de México (UNAM),Universidad Nacional Autonoma de Mexico

Sanchez-Bermudez, J. (author): Universidad Nacional Autónoma de México (UNAM),Universidad Nacional Autonoma de Mexico

Scicluna, P. (author): European Southern Observatory Santiago

Siess, L. (author): Université libre de Bruxelles (ULB)

Thévenin, F. (author): Observatoire de la Cote d'Azur

Van Eck, S. (author): Université libre de Bruxelles (ULB)

Vlemmings, Wouter, 1974 (author): Chalmers tekniska högskola,Chalmers University of Technology

Weigelt, G. (author): Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)

Wittkowski, M. (author): European Southern Observatory (ESO)

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2024
2024
English.
In: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 687

Related links:: https://research.cha... (primary) (free); show more...; https://doi.org/10.1...; https://research.cha...; show less...

Journal article (peer-reviewed)

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Context . Asymptotic giant branch (AGB) stars enrich the interstellar medium through their mass loss. The mechanism(s) shaping the circumstellar environment of mass-losing stars is not clearly understood so far. Aims. 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) and search for signatures of its companion in the dust-forming region of the atmosphere. Methods . The star was observed in the L and N bands with the VLTI/MATISSE instrument at low spectral resolution. We reconstructed images of the photosphere and surroundings of V Hya using the two bands and compared our interferometric observables with VLTI/MIDI and VISIR archival data. To constrain the dust properties, we used the 1D radiative transfer code DUSTY to model the spectral energy distribution. Results . The star is dominated by dust emission in the L- and N-bands. 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 that likely is of photospheric origin. In the N band, we found a 20 mas extension northeast 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 the 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 yr ago, supporting the idea that the particle enhancement is related to the dusty clump moving along with the companion. The VISIR image confirms the presence of a large-scale dusty circumstellar envelope surrounding V Hya. Conclusions . The MATISSE images unveil the presence of a dust enhancement at the position of the companion. This opens new doors for further analyses of the binary interaction with an AGB component.

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An impressionist view of V Hydrae: When MATISSE paints asymmetric giant blobs

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