The open source SKIRT Monte Carlo radiative transfer code has been used for more than 15 years to model the interaction between radiation and dust in various astrophysical systems. In this work, we present version 9 of the code, which has been substantially redesigned to support long-term objectives. We invite interested readers to participate in the development, testing and application of new features such as including gas media types in addition to dust, performing line transfer in addition to continuum radiation transfer, and modeling polarization by non-spherical dust grains aligned by magnetic fields. We describe the major challenges involved in preparing the code for these and other extensions, as well as their resolution, including a completely new treatment of wavelengths to support kinematics. SKIRT 9 properly runs over 400 handcrafted functional tests and successfully performs all relevant benchmarks. The source code and all documentation are publicly available for use and ready for further collaborative development.

开源SKIRT蒙特卡洛辐射转移代码已经使用了15年以上，用于模拟各种天体系统中辐射与尘埃之间的相互作用。在这项工作中，我们介绍了该代码的版本9，该版本已进行了重大重新设计以支持长期目标。我们邀请有兴趣的读者参与新功能的开发，测试和应用，例如除粉尘外还包括气体介质类型，除连续辐射传输外还执行线传输以及通过磁场对准的非球形尘埃颗粒对极化进行建模。我们描述了为这些扩展名和其他扩展名准备代码所涉及的主要挑战，以及它们的解决方案，包括对波长进行全新处理以支持运动学。SKIRT 9可以正确运行400多个手工功能测试，并成功执行所有相关基准测试。源代码和所有文档都可以公开使用，并准备进行进一步的协作开发。