[mesa-users] Binary capabilities on MESA

Bill Paxton paxton at kitp.ucsb.edu
Thu Oct 4 13:08:37 EDT 2012


Also, take a look at star/binary_systems/tide_routines.inc -- I've haven't tested it, but I think it is close to being a working implementation in mesa of the spiba routine from Norbert et al.   We'll need to add code to the rlo routines to call the synch_spin_to_orbit routine from an "other_torque" routine.  The other_torque routine will need to get the arguments for synch_spin_to_orbit from the current state of the binary (see star/binary_systems/rlo_data.inc).


On Oct 4, 2012, at 5:03 AM, Pablo Marchant wrote:

> Hi! Last August at the MESA summer school we had a small session where we discussed the binary evolution capabilities of MESA. As far as I can remember, Bill Paxton said that the current implementation for binaries is more a "proof of concept" than a robust implementation (not his precise words but something on that line). In that sense, the current code has restrictions, as for instance only one star can be an accretor while the other one is set as the donor in a fixed way at the beggining of the simulation. Also, tidal torques are not implemented.
> Even though I'm not very experienced in FORTRAN, I've been skimming through the source code trying to understand where these things are done, but not to much avail. I've also been playing with the binary examples on the test suite (binary_rlo and binary_rlo_implicit, which have equal initial conditions but different implementations for mass transfer), but I have no idea if there's a simple way to output info on the binary system itself.
> So, going to the point ... I'm really interested on getting a robust implementation for binaries on MESA, so mostly I'd like to know more precisely what are the limitations of the current implementation and if it's part of the development roadmap to enhance this capability. In any case, I would not have problems on getting involved on actual development for this functionality.
> Cheers to all!
> -- 
> Pablo Marchant Campos
> M.Sc on Astrophysics, Universidad Católica de Chile
> PhD student, Argelander-Institut für Astronomie
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