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MATISSE first pictures of dust and molecules around R Sculptoris

Published online by Cambridge University Press:  30 November 2022

J. Drevon Open the ORCID record for J. Drevon [Opens in a new window] ,
F. Millour ,
P. Cruzalèbes ,
C. Paladini ,
J. Hron ,
A. Meilland ,
F. Allouche ,
B. Aringer ,
P. Berio  and
W.C. Danchi
...Show all authors
J. Drevon
Affiliation:
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France email: [email protected]
F. Millour
Affiliation:
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France email: [email protected]
P. Cruzalèbes
Affiliation:
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France email: [email protected]
C. Paladini
Affiliation:
European Southern Observatory, Alonso de Córdova, 3107 Vitacura, Santiago, Chile
J. Hron
Affiliation:
Department of Astrophysics, University of Vienna, Türkenschanzstrasse 17
A. Meilland
Affiliation:
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France email: [email protected]
F. Allouche
Affiliation:
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France email: [email protected]
B. Aringer
Affiliation:
Department of Astrophysics, University of Vienna, Türkenschanzstrasse 17
P. Berio
Affiliation:
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France email: [email protected]
W.C. Danchi
Affiliation:
NASA Goddard Space Flight Center, Astrophysics Division, Greenbelt, MD 20771, USA
V. Hocdé
Affiliation:
Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, 00-716 Warszawa, Poland
K.-H. Hofmann
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
S. Lagarde
Affiliation:
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France email: [email protected]
B. Lopez
Affiliation:
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France email: [email protected]
A. Matter
Affiliation:
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France email: [email protected]
R. Petrov
Affiliation:
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France email: [email protected]
S. Robbe-Dubois
Affiliation:
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France email: [email protected]
D. Schertl
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
P. Stee
Affiliation:
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France email: [email protected]
F. Vakili
Affiliation:
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France email: [email protected]
J. Varga
Affiliation:
Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Eötvös Loránd Research Network (ELKH), Konkoly-Thege Miklós út 15-17, H-1121 Budapest, Hungary Leiden Observatory, Leiden University, Niels Bohrweg 2, NL-2333 CA Leiden, The Netherlands
R. Waters
Affiliation:
Department of Astrophysics/IMAPP, Radboud University, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands SRON Netherlands Institute for Space Research Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
G. Weigelt
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
J. Woillez
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany
M. Wittkowski
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany
G. Zins
Affiliation:
European Southern Observatory, Alonso de Córdova, 3107 Vitacura, Santiago, Chile
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Abstract

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Carbon-rich dust is known to form in the atmosphere of the semiregular variable star R Sculptoris. Such stardust, as well as the molecules and gas produced during the lifetime of the star, will be spread into the Galaxy via the mass-loss process. Probing this process is crucial to understand the chemical enrichment of the Galaxy. R Scl was observed using the ESO/VLTI MATISSE instrument in December 2018. Here we show the first images of the star between 3 and 10 R*. Using the complementary MIRA 3D image reconstruction and the RHAPSODY 1D intensity profile reconstruction code, we reveal the location of molecules and dust in the close environment of the star. Indeed, the C2H2 and HCN molecules are spatially located between 1 and 3.4 R* which is much closer to the star than the location of the dust. The R Scl spectrum is fitted by molecules and a dust mixture of 90% of amorphous carbon and 10% of silicone carbide. The inner boundary of the dust envelope is estimated by DUSTY at about 4.6 R*. We derive a mass-loss rate of 1.2 ± 0.4 × 10−6M⊙ yr−1however no clear SiC forming region has been detected in the MATISSE data.

Keywords

instrumentation: interferometersstars: AGB and post-AGBstars: carbonstars: atmospheresstars: mass lossstars: individual: R Scl
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S366: The Origin of Outflows in Evolved Stars , November 2020 , pp. 190 - 195
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Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of International Astronomical Union

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