[Mesa-users] Turning off angular momentum transfer in MESA

[Gehrman, Thomas Charles]

Thank you for the suggestions and help!


Best regards,


Thomas

________________________________
From: Pablo Marchant <pamarca at gmail.com>
Sent: Friday, September 28, 2018 7:16:53 AM
To: Gehrman, Thomas Charles
Cc: mesa-users
Subject: Re: [Mesa-users] Turning off angular momentum transfer in MESA

Hi Thomas,

these type of options are part of the binary module, and you can look what's available under $MESA_DIR/binary/defauls/binary_controls.defaults. In particular you would be interested in this option

###
do_j_accretion ¶
If true, compute accretion of angular momentum following A.3.3 of de Mink et al. 2013, ApJ, 764, 166. Otherwise, incoming material is assumed to have the specific angular momentum of the surface of the accretor
###

You have to beware how MESA actually adds mass into a stellar model. For newly added layers their angular momentum content needs to be specified somehow. There's no such thing as simply turning off angular momentum transfer. If you have a different model for the amount of angular momentum that would be accreted, you can take a look at the use_other_accreted_material_j option, which let's you specify any prescription you want for the angular momentum of newly accreted layers.

Cheers

On Thu, Sep 27, 2018 at 1:42 PM Gehrman, Thomas Charles <thomas.gehrman at mnsu.edu<mailto:thomas.gehrman at mnsu.edu>> wrote:

Hello all,


I've been trying to find settings in control.defaults and star_job.defaults to turn off MESA's angular momentum transfer during mass transfer. MESA's prebuilt angular momentum transfer spins up the gainer star in a binary star system to the break up speed too quickly. The spin down equations I'm using are no where near the same order of magnitude as MESA's spin up effects. MESA does a wonderful job reproducing the order of magnitudes I need to reproduce data of a paper for spin of the gainer.


Thank you kindly,


Thomas


Thomas C. Gehrman Jr.

M.S. Physics & Graduate Teaching Assistant

Department of Physics and Astronomy

Minnesota State University, Mankato

Office: N144



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--
Pablo Marchant Campos
M.Sc on Astrophysics, Universidad Católica de Chile
PhD on Astrophysics, Argelander-Institut für Astronomie, Universität Bonn
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