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Aims. We investigate potential models that could explain why multiple proto-stellar systems predominantly show single jets. During their formation, stars most frequently produce energetic outﬂows and jets. However, binary jets have only been observed in a very small number of systems. Methods. We model numerically 3D binary jets for various outﬂow parameters. We also model the propagation of jets from a speciﬁc source, namely L1551 IRS 5, known to have two jets, using recent observations as constraints for simulations with a new MHD code. We examine their morphology and dynamics, and produce synthetic emission maps. Results. We ﬁnd that the two jets interfere up to the stage where one of them is almost destroyed or engulfed into the second one. We are able to reproduce some of the observational features of L1551 such as the bending of the secondary jet. Conclusions. While the eﬀects of orbital motion are negligible over the jets dynamical timeline, their interaction has signiﬁcant impact on their morphology. If the jets are not strictly parallel, as in most observed cases, we show that the magnetic ﬁeld can help the collimation and refocusing of both of the two jets.
Murphy,G., Lery, T., O'Suillivan, S., Spicer, D.S., Bacciotti, F., Rosen, A. (2008) Interacting Jets From Binary Protostars, Astronomy & Astrophysics 478, 453–460. DOI: 10.1051/0004-6361:20078609