Interacting jets from binary protostars

Highlighted Paper (More)

Free access article

Issue		A&A Volume 478, Number 2, February I 2008


Page(s)		453 - 460
Section		Interstellar and circumstellar matter
DOI		http://dx.doi.org/10.1051/0004-6361:20078609

A&A 478, 453-460 (2008)
DOI: 10.1051/0004-6361:20078609

Interacting jets from binary protostars

G. C. Murphy¹, T. Lery², S. O'Sullivan³, D. Spicer⁴, F. Bacciotti⁵, and A. Rosen⁶

¹ Laboratoire d'Astrophysique de Grenoble, CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble, France
    e-mail: Gareth.Murphy@obs.ujf-grenoble.fr
² European Science Foundation, 1 quai Lezay-Marnesia, BP 90015, 67080 Strasbourg, France
    e-mail: tlery@esf.org
³ UCD School of Mathematical Sciences, University College Dublin, Belfield, Dublin 4, Ireland
    e-mail: stephen.osullivan@ucd.ie
⁴ NASA/GSFC Laboratory for Solar and Space Physics, Mail Stop 612.1, Greenbelt, MD 20771, USA
    e-mail: daniel.s.spicer@nasa.gov
⁵ INAF - Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Florence, Italy
    e-mail: fran@arcetri.astro.it
⁶ Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
    e-mail: arosen@mpifr-bonn.mpg.de

(Received 4 September 2007 / Accepted 13 November 2007)

Abstract
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.

Key words: ISM: Herbig-Haro objects -- ISM: individual objects: LDN 1551 IRS 5 -- ISM: jets and outflows -- stars: formation

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.