Astronomy and Astrophysics, volume 604, L1-1 (2017/8-1)
CALYPSO view of SVS 13A with PdBI: Multiple jet sources.
LEFEVRE C., CABRIT S., MAURY A.J., GUETH F., TABONE B., PODIO L., BELLOCHE A., CODELLA C., MARET S., ANDERL S., ANDRE P. and HENNEBELLE P.
Abstract (from CDS):
Aims. We aim to clarify the origin of the multiple jet features emanating from the binary protostar SVS 13A (=VLA4A/VLA4B).
Methods. We used the Plateau de Bure Interferometer to map at 0.3-0.8'' (∼70-190au) dust emission at 1.4mm, CO(2-1), SiO(5-4), SO(65-54). Revised proper motions for VLA4A/4B and jet wiggling models are computed to clarify their respective contribution.
Results. VLA4A shows compact dust emission suggestive of a disk <50au, and is the hot corino source, while CO/SiO/SO counterparts to the small-scale H2 jet originate from VLA4B and reveal the jet variable velocity structure. This jet exhibits ∼3'' wiggling consistent with orbital motion around a yet undetected ∼20-30 au companion to VLA4B, or jet precession. Jet wiggling combined with velocity variability can explain the large apparent angular momentum in CO bullets. We also uncover a synchronicity between CO jet bullets and knots in the HH7-11 chain demonstrating that they trace two distinct jets. Their ∼300yr twin outburst period may be triggered by close perihelion approach of VLA4A in an eccentric orbit around VLA4B. A third jet is tentatively seen at PA∼0°.
Conclusions. SVS13 A harbors at least 2 and possibly 3 distinct jet sources. The CO and HH7-11 jets are launched from quasi-coplanar disks, separated by 20-70 au. Their synchronous major events every 300yr favor external triggering by close binary interactions, a scenario also invoked for FU Or outbursts.
© ESO, 2017
stars: protostars - stars: low-mass - ISM: jets and outflows - ISM: individual objects: NGC 1333 SVS 13A - ISM: individual objects: NGC 1333 SVS 13A
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