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An impressionist view of V Hydrae

Planquart, L. (author)
NRS, Tongeren, Belgium.;Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium.;European Southern Observ, 3107 Vitacura, Santiago, Chile.
Paladini, C. (author)
European Southern Observ, 3107 Vitacura, Santiago, Chile.
Jorissen, A. (author)
Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium.
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Escorza, A. (author)
European Southern Observ, 3107 Vitacura, Santiago, Chile.;Inst Astrofis Canarias, C Via Lactea, San Cristobal la Laguna 38205, Tenerife, Spain.;Univ La Laguna, Dept Astrofis, Av Astrofisico Francisco Sanchez, San Cristobal la Laguna 38206, Tenerife, Spain.
Pantin, E. (author)
Univ Paris Saclay, Univ Paris Cite, CNRS, AIM,CEA, F-91191 Gif Sur Yvette, France.
Drevon, J. (author)
European Southern Observ, 3107 Vitacura, Santiago, Chile.;Univ Cote dAzur, Observ Cote dAzur, CNRS, Lab Lagrange, Nice, France.
Aringer, B. (author)
Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria.
Baron, F. (author)
Georgia State Univ, Ctr High Angular Resolut Astron, POB 5060, Atlanta, GA 30302 USA.;Georgia State Univ, Dept Phys & Astron, POB 5060, Atlanta, GA 30302 USA.
Chiavassa, A. (author)
Univ Cote dAzur, Observ Cote dAzur, CNRS, Lab Lagrange, Nice, France.
Cruzalebes, P. (author)
Univ Cote dAzur, Observ Cote dAzur, CNRS, Lab Lagrange, Nice, France.
Danchi, W. (author)
NASA Goddard Space Flight Ctr, Greenbelt, MD USA.
De Beck, E. (author)
Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, S-43992 Onsala, Sweden.
Groenewegen, M. A. T. (author)
Royal Observ Belgium, Ringlaan 3, B-1180 Brussels, Belgium.
Höfner, Susanne (author)
Uppsala universitet,Teoretisk astrofysik
Hron, J. (author)
Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria.
Khouri, T. (author)
Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, S-43992 Onsala, Sweden.
Lopez, B. (author)
Univ Cote dAzur, Observ Cote dAzur, CNRS, Lab Lagrange, Nice, France.
Lykou, F. (author)
Hungarian Res Network HUN REN, Res Ctr Astron & Earth Sci, Konkoly Observ, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary.
Montarges, M. (author)
Univ PSL, Sorbonne Univ, Univ Paris Cite, LESIA,CNRS,Observ Paris, 5 Pl Jules Janssen, F-92195 Meudon, France.
Nardetto, N. (author)
Univ Cote dAzur, Observ Cote dAzur, CNRS, Lab Lagrange, Nice, France.
Ohnaka, K. (author)
Univ Andres Bello, Inst Astrofis, Fernandez Concha 700, Santiago, Chile.
Olofsson, H. (author)
Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, S-43992 Onsala, Sweden.
Rau, G. (author)
NASA Goddard Space Flight Ctr, Greenbelt, MD USA.
Rosales-Guzman, A. (author)
Univ Nacl Autonoma Mexico, Inst Astron, Apdo Postal 70264, Mexico City 04510, Mexico.
Sanchez-Bermudez, J. (author)
Univ Nacl Autonoma Mexico, Inst Astron, Apdo Postal 70264, Mexico City 04510, Mexico.
Scicluna, P. (author)
European Southern Observ, 3107 Vitacura, Santiago, Chile.
Siess, L. (author)
Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium.
Thevenin, F. (author)
Univ Cote dAzur, Observ Cote dAzur, CNRS, Lab Lagrange, Nice, France.
Van Eck, S. (author)
Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium.
Vlemmings, W. H. T. (author)
Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, S-43992 Onsala, Sweden.
Weigelt, G. (author)
Max Planck Inst Radio Astron, Hugel 69, D-53121 Bonn, Germany.
Wittkowski, M. (author)
European Southern Observ ESO, Karl Schwarzschild Str 2, D-85748 Garching, Germany.
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NRS, Tongeren, Belgium;Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium.;European Southern Observ, 3107 Vitacura, Santiago, Chile. European Southern Observ, 3107 Vitacura, Santiago, Chile. (creator_code:org_t)
EDP Sciences, 2024
2024
English.
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 687
Related links:
https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
https://urn.kb.se/re...
https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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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.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

techniques: interferometric
stars: AGB and post-AGB
stars: carbon
stars: mass-loss
stars: individual: V Hydrae

Publication and Content Type

ref (subject category)
art (subject category)

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