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ALMA (finally!) discloses a rotating disk+bipolar wind system at the centre of the wind-prominent pPN OH 231.8+4.2

Published online by Cambridge University Press:  30 November 2022

C. Sánchez Contreras Open the ORCID record for C. Sánchez Contreras [Opens in a new window] ,
J. Alcolea Open the ORCID record for J. Alcolea [Opens in a new window] ,
R. Rodríguez-Cardoso ,
V. Bujarrabal ,
A. Castro-Carrizo ,
L. Velilla-Prieto Open the ORCID record for L. Velilla-Prieto [Opens in a new window] ,
G. Quintana-Lacaci ,
M. Santander-García Open the ORCID record for M. Santander-García [Opens in a new window] ,
M. Agúndez  and
J. Cernicharo
C. Sánchez Contreras
Affiliation:
Centro de Astrobiología (CSIC-INTA), Camino Bajo del Castillo s/n, E-28691 Villanueva de la Cañada, Madrid, Spain email: csanchez@cab.inta-csic.es
J. Alcolea
Affiliation:
Observatorio Astronómico Nacional (IGN), Alfonso XII No 3, 28014 Madrid, Spain
R. Rodríguez-Cardoso
Affiliation:
Centro de Astrobiología (CSIC-INTA), Camino Bajo del Castillo s/n, E-28691 Villanueva de la Cañada, Madrid, Spain email: csanchez@cab.inta-csic.es Observatorio Astronómico Nacional (IGN), Alfonso XII No 3, 28014 Madrid, Spain
V. Bujarrabal
Affiliation:
Observatorio Astronómico Nacional (IGN), Ap 112, 28803 Alcalá de Henares, Madrid, Spain
A. Castro-Carrizo
Affiliation:
Institut de Radioastronomie Millimetrique, 300 rue de la Piscine, 38406 Saint Martin d’Heres, France
L. Velilla-Prieto
Affiliation:
Instituto de Fisica Fundamental (CSIC), C/ Serrano, 123, E-28006, Madrid, Spain
G. Quintana-Lacaci
Affiliation:
Instituto de Fisica Fundamental (CSIC), C/ Serrano, 123, E-28006, Madrid, Spain
M. Santander-García
Affiliation:
Observatorio Astronómico Nacional (IGN), Alfonso XII No 3, 28014 Madrid, Spain
M. Agúndez
Affiliation:
Instituto de Fisica Fundamental (CSIC), C/ Serrano, 123, E-28006, Madrid, Spain
J. Cernicharo
Affiliation:
Instituto de Fisica Fundamental (CSIC), C/ Serrano, 123, E-28006, Madrid, Spain
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Abstract

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We present interferometric continuum and molecular line emission maps obtained with the Atacama Large Millimeter/submillimeter Array (ALMA) of OH231.8+4.2, a well studied bipolar nebula around an asymptotic giant branch (AGB) star that is key to understand the remarkable changes in nebular morphology and kinematics during the short transition from the AGB to the Planetary Nebula (PN) phase. The excellent angular resolution of our maps (∼20 mas ∼30 AU) allows us to scrutinize the central nebular regions of OH231.8+4.2, which hold the clues to understanding how this iconic object assembled its complex nebular architecture. We report, for the first time in this object and others of its kind (i.e. pre-PNe with massive bipolar outflows), the discovery of a rotating circumbinary disk of radius ∼30 AU traced by NaCl, KCl, and H2O emission lines. The disk lies at the base of a young bipolar wind with signs of rotation as well. A compact spatially resolved dust disk is found perpendicular to the bipolar outflow. We also identify a point-like continuum source, which likely represents the central Mira star enshrouded by a ∼3 R* shell or disk of hot (∼1400 K) freshly formed dust. The point source is slightly off-centre from the disk centroid, enabling us for the first time to place constraints to the orbital separation of the central binary system.

Keywords

AGB and post-AGB starsplanetary nebulaemass-lossrotating disksbinariesOH231.8+4.2
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S366: The Origin of Outflows in Evolved Stars , November 2020 , pp. 301 - 307
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of International Astronomical Union

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