Massstream trajectories in binary systems
While working on my project on the role of disk masstransfer in systems with mainsequence accretors I found that in many cases mass transfer occurred with a donor that rotated subsynchronously (slower than the orbit), although the torques and other properties of the masstransfer were calculated to occur from synchronous donors. It is important to properly account for this because my goal is to make a correct concensus of how important disk masstransfer is in these systems, and using the wrong stream properties strongly affects whether disks will form.
Finding that there was much asynchronous rotation prompted me to look deeper into this problem and see if I could implement something in binary_c to solve this issue. While other people have looked at this before, I culd find no publicly available datasets that contained the data to implement what I needed. At that point I decided to calculate this myself, and to make whatever results I found publicly available so other people can use this.
The project became a twofold exercise:
 Evolve resolved binary system populations and track the relevant quantities:

relative velocity of the mass stream
 massratio of the binary system,

synchronicity of the donor,
and we weigh these quantities by the amount of mass that is transferred with these quantities, and how much time is spent doing so

 Calculate ballistic trajectories of the massstream on a grid spanned by the above quantities.
I wrote my own ballistic trajectory calculator (which I will make publicly available soon, I promise) and used this to calculate groups of massstream trajectories where I varied the massratio, initial velocity and synchronicity factor of the stream. I calculated weighted averages of properties like the radius of closest approach, the angular momentum of the stream at that point and the angular momentum of the stream at certain fixed distances from the accretor.
In my paper I first introduce the topic of masstransfer and asynchronously rotating donors, and go over the historical developments that came before my work. I then describe the equations of massstream trajectories and masstransfer. In the first part of the result detail my findings of the binary populations which I use to motivate the rest of the study. The second part of the result section describes the results of two extremes: 1) asynchronous masstransfer with slow and narrow streams and 2) aysnchronous masstransfer with fast and wide streams. The discussion puts things back into a broader context and I conclude with some summarizing points of my findings.
The paper has now been published in MNRAS and is available on https://doi.org/10.1093/mnras/stad2077 and the preprint is available on https://arxiv.org/abs/2307.04600. The data and routines to remake the figures in the paper are hosted on https://zenodo.org/doi/10.5281/zenodo.7007590.