2024-03-29T02:17:32Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/2118242021-02-13T05:32:16Zcom_10261_97com_10261_4col_10261_350
http://hdl.handle.net/10261/211824
10.3847/2041-8213/ab70b8
391800
Shaping the Envelope of the Asymptotic Giant Branch Star W43A with a Collimated Fast Jet
IOP Publishing
2020
artículo
Tafoya, Daniel
Imai, Hiroshi
Gómez Rivero, José Francisco
Nakashima, Jun-ichi
Orosz, Gabor
Yung, Bosco H. K.
Asymptotic giant branch stars
Stellar jets
2020
One of the major puzzles in the study of stellar evolution is the formation process of bipolar and multipolar planetary nebulae. There is growing consensus that collimated jets create cavities with dense walls in the slowly expanding (10-20 km s-1) envelope ejected in previous evolutionary phases, leading to the observed morphologies. However, the launching of the jet and the way it interacts with the circumstellar material to create such asymmetric morphologies have remained poorly known. Here we present for the first time CO emission from the asymptotic giant branch star W43A that traces the whole stream of a jet, from the vicinity of its driving stellar system out to the regions where it shapes the circumstellar envelope. We found that the jet has a launch velocity of 175 km s-1 and decelerates to a velocity of 130 km s-1 as it interacts with circumstellar material. The continuum emission reveals a bipolar shell with a compact bright dot in the center that pinpoints the location of the driving source of the jet. The kinematical ages of the jet and the bipolar shell are equal, τ ∼ 60 yr, indicating that they were created simultaneously, probably by a common underlying mechanism, and in an extremely short time. These results provide key initial conditions for the theoretical models that aim to explain the formation of bipolar morphologies in the circumstellar envelopes of low- A nd intermediate-mass stars. © 2020. The American Astronomical Society. All rights reserved.
Ministerio de Economía y Competitividad (España)
European Commission
Ministerio de Ciencia, Innovación y Universidades (España)
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology (Japan)
Australian Research Council
National Key Research and Development Program (China)
European Research Council
Astrophysical Journal Letters
2020
890
L14