Shaping the Envelope of the Asymptotic Giant Branch Star W43A with a Collimated Fast Jet

This Letter makes use of the following ALMA data: ADS/JAO.ALMA#2016.1.00540.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. The VLBA is operated by the National Radio Astronomy Observatory (NRAO) under cooperative agreement by Associated Universities, Inc. J.F.G. is partially supported by MINECO (Spain) grant AYA2017-84390-C2-R (co-funded by FEDER) and by the State Agency for Research of the Spanish MCIU through the "Center of Excellence Severo Ochoa" award for the Instituto de Astrofisica de Andalucia (SEV-2017-0709). H.I. and G.O. are supported by the MEXT KAKENHI program (16H02167). H.I. and J.F.G. were supported by the Invitation Program for Foreign Researchers of the Japan Society for Promotion of Science (JSPS grant S14128). G.O. was supported by the Australian Research Council Discovery project DP180101061 of the Australian government, and the grants of CAS LCWR 2018-XBQNXZ-B-021 and National Key R&D Program 2018YFA0404602 of China. D.T. was supported by the ERC consolidator grant 614264. The authors are grateful to Bruce Balick for careful reading of the Letter and valuable suggestions and comments.