[mesa-users] Question with the binary module

Robert Farmer rjfarmer at asu.edu
Fri Apr 15 14:04:01 EDT 2016

I've not tried tidal syncs, but whats happens if you turn on rotation for
the two stars in inlist1 and inlist2, and set some initial rotation rate?

See http://mesa.sourceforge.net/star_job_defaults.html#rotation_controls
for the available options. Or look at the binary_with_rot inlists from the
mesa3 paper http://mesastar.org/results/mesa-iii-instrument-paper-inlists


On Fri, Apr 15, 2016 at 9:31 AM, Kuo-Chuan Pan <kuo-chuan.pan at unibas.ch>

> Dear MESA users,
> I have few problems with the tidal circularisation and the wind mass lost
> in the binary module.
> I was trying to reproduce the binary evolution model that similar to the
> progenitor of GW 150914
> in Belczynski et al. (2016; http://arxiv.org/abs/1602.04531v1 ) with MESA
> (version 8118).
> In their paper (fig 1 in  http://arxiv.org/abs/1602.04531v1 ), the
> progenitor was a (96.2 + 60,2 msun)
> binary with z= 3% z_sun. The initial binary separation is 2463 Rsun and
> eccentricity e=0.15.
> I have included tidal circularisation, synchronisation, and mass lost due
> to “Nieuwenhuijzen” scheme
> for cool wind and “Kudritzki” for hot wind. By playing around the wind
> parameters, I could reproduce
> the mass of both stars at the first RLOF (stage 2 in Fig 1 in Belczynski
>  et al. 2016).
> However, I couldn’t reproduce the evolution time (t=3.5445 Myr), binary
> separation (a=2140 Rsun),
> and eccentricity (e=0) as in the paper.
> In my run (version 8118 ,see attached inlist), the first RLOF happens at
> t=2.66 Myr (=model number 164),
> and the binary separation is a=2530 Rsun (e~0.15). As you can seen in my
> attached figure fig_eccentricity.png,
> the tidal circularisation did almost nothing (I have tried circa_type_* =
> “Hut_rad” and “Hut_conv”) before the first RLOF
> (at model number =164). The binary separation seems increased (due to the
> wind) but not shrink as in the paper.
> If I turned off winds, there is almost no mass-lost before the first RLOF
> and no changes in the eccentricity.
> I was wondering if anyone could give me some suggestions to reproduce the
> results at the first RLOF in the paper.
> Many thanks,
> Kuo-Chuan
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