Published July 30, 2024
| Version v1
Journal article
An impressionist view of V Hydrae
Creators
- 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
- 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
- Weigelt, G.
- Wittkowski, M.
Contributors
Others:
- Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)
- Joseph Louis LAGRANGE (LAGRANGE) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur ; Université Côte d'Azur (UniCA)-Université Côte d'Azur (UniCA)-Centre National de la Recherche Scientifique (CNRS)
- A.J. is supported by the Fonds National de la Recherche Scientifique (F.R.S.-FNRS) under PDR grant T.0115.23. S.H. acknowledges funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant agreement No. 883867, project EXWINGS) and the Swedish Research Council (Vetenskapsradet, grant number 2019-04059). F.L. received funding from the Hungarian NKFIH OTKA project no. K-132406. M.M. acknowledges funding from the Programme Paris Region fellowship supported by the Région Ile-de-France. This project has received funding from the European Union's Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant agreement No. 945298.
Description
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.
Abstract
International audienceAdditional details
Identifiers
- URL
- https://hal.science/hal-04728537
- URN
- urn:oai:HAL:hal-04728537v1
Origin repository
- Origin repository
- UNICA