CALYPSO view of SVS 13A with PdBI: Multiple jet sources
  Aims. We wish 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" (~70-190 au) dust emission at 1.4 mm,
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 < 50 au, 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 ~ 300 yr 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
degrees. 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 300 yr favor
external triggering by close binary interactions, a scenario also invoked for
FU Or outbursts.
