First image of the L1157 molecular jet by the CALYPSO IRAM-PdBI survey
L. Podio, C. Codella, F. Gueth, S. Cabrit, A. Maury, B. Tabone, C., Lef\`evre, S. Anderl, P. Andr\'e, A. Belloche, S. Bontemps, P. Hennebelle, B., Lefloch, S. Maret, L. Testi

TL;DR
This study presents the first high-resolution imaging of the molecular jet in the L1157 protostar, revealing asymmetries and precession that shed light on jet launching mechanisms during early star formation.
Contribution
First direct imaging of the L1157 molecular jet at 200 au resolution, demonstrating jet asymmetry, precession, and linking jet properties to outflow characteristics.
Findings
Jet is asymmetric with the blue lobe slower than the red lobe.
Jet precesses with a period of approximately 1640 years.
Jet could extract at least 25% of the star's gravitational energy.
Abstract
Fast jets are thought to be a crucial ingredient of star formation because they might extract angular momentum from the disk and thus allow mass accretion onto the star. However, it is unclear whether jets are ubiquitous, and likewise, their contribution to mass and angular momentum extraction during protostar formation remains an open question. Our aim is to investigate the ejection process in the low-mass Class 0 protostar L1157. This source is associated with a spectacular bipolar outflow, and the recent detection of high-velocity SiO suggests the occurrence of a jet. Observations of CO 2-1 and SiO 5-4 at 0.8" resolution were obtained with the IRAM Plateau de Bure Interferometer as part of the CALYPSO large program. The jet and outflow structure were fit with a precession model. We derived the column density of CO and SiO, as well as the jet mass-loss rate and mechanical…
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