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Protostellar outflows increase the fraction of Twin-binaries

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  • Figure 1: Column density plot of an exemplary simulation from our sample of 88 simulations at t = 0.5 tff = 86 kyr. The simulations are performed with the SPH code GANDALF. A detailed description of the simulation setup can be found in Rohde et al. 2020. A massive circumbinary disc surrounds a binary system. Accretion flows feed material from the disc onto the central protostars (green marker).
  • Figure 2: Distribution of mass ratios between the secondary and primary star of all binary systems in our sample of 88 simulations at t = 5 tff after the first star forms. The sample is divided into an OF-sample (orange) with outflow feedback and an RF-sample without outflow feedback (blue). There are 35 binary systems in the OF sample, and 44 in the RF-sample. The OF-sample with outflows shows a significantly higher fraction of Twin-binaries with q > 0.5 (dashed grey line).

Theoretical Astrophysics group Cologne - TAC

Our research deals with the numerical modelling of the star formation process by means of high-performance, 3D, magneto-hydrodynamical (MHD) simulations. The simulations cover large spatial scales from ISM physics on kpc scales over molecular clouds on scales of 10 - 100 pc to star forming filaments on (sub-) pc scales and finally to protostellar discs and jets on scales of 10 - 1000 AU.

In our research group we use several tools like the (M)HD codes FLASH, GADGET, GANDALF , the astrochemical code KROME, 3D-PDR or radiative transport codes like RADMC-3D and POLARIS.

Prof. Dr. Stefanie Walch-Gassner is the head of the SILCC project (SImulating the life Cyle of molecular Clouds), a collaboration of several European astrophysical institutes, which has set the aim to model the formation, evolution, and dispersal of molecular clouds in 3D, MHD simulations with particular focus on a detailed astro-chemical modelling and the inclusion of various feedback processes.

Contact information:

  • Phone: (+49|0) 221 / 470 - 3497
  • Fax: (+49|0) 221 / 470 - 5162
  • Email: walch [at] ph1.uni-koeln.de

Consultation hours

upon agreement in Room 1.14, Building 312