Abstract: A recent direction in dark matter phenomenology has been to consider multi-component dark matter, containing subsectors with interesting interactions and structure. These include models where part of dark matter is dissipative. In these particular models, the dissipative subsector will cool to form a dark matter disk, whose size, density, and temperature can be predicted from the parameters of the model. I will discuss details of the model and of the disk formation process, as well as various observational constraints and possible evidence for such a disk. I will also discuss potential astrophysical constraints from recent Gaia data, and under what assumptions these constraints should be taken seriously.
