English

Dust continuum radiation maps from MHD simulations of accretion-ejection systems around single and binary stars

High Energy Astrophysical Phenomena 2025-04-16 v1 Solar and Stellar Astrophysics

Abstract

We study the launching of magnetized jets from a resistive circumstellar disk within a binary system, employing a unique combination of 3D MHD jet launching simulations (PLUTO code) and post-processed 3D radiative transfer modeling (RADMC-3D code). Our findings reveal a well-defined jet originating from the inner region of the disk, extending to a larger disk area. While the model attains steady states for a single star, a binary system leads to the emergence of tidal effects such as the formation of ``spiral arms'' in the disk and inside the jet. Here we have consistently implemented a time-dependent Roche potential for the gravity of the binary. As a major step forward, we further present the first 3D radiation maps of the dust continuum for the disk-jet structure. In principle, this allows us to compare MHD simulation results to observed disk-outflow features. We, therefore, present convolved images of the dust continuum emission, employing exemplary point spread functions of the MIRI instrument (5~μm\mu m band) and the ALMA array (320~μm\mu m band). In these bands, we identify distinguishable features of the disk-jet structure, such as "spiral arms," which we have also seen in the MHD dynamics.For gas density increased by an order of magnitude, the disk become optically thick at 5~μm\mu m, but remains bright at 320~μ\mum. At this wavelength, 320~μ\mum, enhanced structural features in the disk and the base of the wind become more pronounced and are well resolved in the convolved image.

Keywords

Cite

@article{arxiv.2504.10599,
  title  = {Dust continuum radiation maps from MHD simulations of accretion-ejection systems around single and binary stars},
  author = {Somayeh Sheikhnezami and Christian Fendt and Sareh Ataiee},
  journal= {arXiv preprint arXiv:2504.10599},
  year   = {2025}
}

Comments

27 pages,22 figures, Accepted for publication in Astrophysical Journal, comments are welcome