ALMA observations of the Red Rectangle, a preliminary analysis⋆
Observatorio Astronómico Nacional (OAN-IGN),
Alcalá de Henares,
2 Institut de Radioastronomie Millimétrique, 300 rue de la Piscine, 38406 Saint Martin d’Hères, France
3 Observatorio Astronómico Nacional (OAN-IGN), C/ Alfonso XII, 3, 28014 Madrid, Spain
4 Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200B, 3001 Leuven, Belgium
5 Centro de Astrobiología (CSIC-INTA), ESAC Campus, 28691 Villanueva de la Cañada, Madrid, Spain
6 Centro de Astrobiología (CSIC-INTA), Ctra. M-108, km. 4, 28850 Torrejón de Ardoz, Madrid, Spain
7 UJF-Grenoble1/CNRS-INSU, Inst. de Planétologie et d’Astrophysique de Grenoble (IPAG) UMR 5274, 38041 Grenoble, France
Received: 9 July 2013
Accepted: 19 July 2013
Aims. We aim to study equatorial disks in rotation and axial outflows in post-AGB objects so as to disclose the formation and shaping mechanisms in planetary nebulae. So far, both disks and outflows have not been observed simultaneously.
Methods. We obtained high-quality ALMA observations of 12CO and 13CO J = 3−2 and 12CO J = 6−5 line emission in the Red Rectangle, the only post-AGB/protoplanetary object for which a disk in rotation has been mapped.
Results. These observations provide an unprecedented description of the complex structure of this source. Together with an equatorial disk in rotation, we find a low-velocity outflow that more or less occupies the region situated between the disk and the optical X-shaped nebula. From our observations and preliminary modeling of the data, we confirm the previously known properties of the disk and obtain a first description of the structure, dynamics, and physical conditions of the outflow.
Key words: stars: AGB and post-AGB / circumstellar matter / radio lines: stars / planetary nebulae: individual: Red Rectangle
Appendix A is available in electronic form at http://www.aanda.org
© ESO, 2013