Binary system: angular momentum lost by accretor at breakup rotation

Ruggero Valli <[email protected]> Tue, 24 Jan 2023 12:25:40 +0100
Newsgroups	gmane.comp.video.mesa3d.user
Message-ID	<[email protected]>
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Hi MESA users,

I am modeling a binary during stable mass transfer with rotation enabled.
I have set the mass transfer to be conservative

mass_transfer_alpha = 0.0d0
mass_transfer_beta = 0.0d0
mass_transfer_delta = 0.0d0
mass_transfer_gamma = 0.0d0

and I am using the de Mink et al. 2013 model for the angular momentum of 
the matter that is accreted.

do_j_accretion = .true.

As soon as mass transfer starts, the accretor is spun up quickly to 
critical rotation (breakup), at which point it undergoes mass loss as 
described in controls.default ("For critical rotation mass loss"), until 
the surface falls below critical rotation again. And this excess mass 
appears to be lost from the binary system.

*My question is the following: *what is the specific angular momentum 
that the code assumes for the mass that is lost due to the accretor 
being above critical rotation? Is this lost mass just handled as wind 
mass loss or does it have a different treatment?

Thank you,
Best regards,
Ruggero

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    <p>Hi MESA users,</p>
    <p>I am modeling a binary during stable mass transfer with rotation
      enabled.<br>
      I have set the mass transfer to be conservative</p>
    <div style="color: #d4d4d4;background-color: #1e1e1e;font-family: 'Droid Sans Mono', 'monospace', monospace;font-weight: normal;font-size: 14px;line-height: 19px;white-space: pre;"><div><span style="color: #d4d4d4;">mass_transfer_alpha = </span><span style="color: #b5cea8;">0.0d0</span></div><div><span style="color: #d4d4d4;">mass_transfer_beta = </span><span style="color: #b5cea8;">0.0d0</span></div><div><span style="color: #d4d4d4;">mass_transfer_delta = </span><span style="color: #b5cea8;">0.0d0</span></div><div><span style="color: #d4d4d4;">mass_transfer_gamma = </span><span style="color: #b5cea8;">0.0d0</span></div></div>
    <p></p>
    <p>and I am using the de Mink et al. 2013 model for the angular
      momentum of the matter that is accreted.</p>
    <div style="color: #d4d4d4;background-color: #1e1e1e;font-family: 'Droid Sans Mono', 'monospace', monospace;font-weight: normal;font-size: 14px;line-height: 19px;white-space: pre;"><div><span style="color: #d4d4d4;">do_j_accretion = </span><span style="color: #569cd6;">.true.</span></div></div>
    <p></p>
    <p>As soon as mass transfer starts, the accretor is spun up quickly
      to critical rotation (breakup), at which point it undergoes mass
      loss as described in controls.default ("For critical rotation mass
      loss"), until the surface falls below critical rotation again. And
      this excess mass appears to be lost from the binary system.<br>
      <br>
      <b>My question is the following: </b>what is the specific angular
      momentum that the code assumes for the mass that is lost due to
      the accretor being above critical rotation? Is this lost mass just
      handled as wind mass loss or does it have a different treatment?<br>
    </p>
    Thank you,<br>
    Best regards,<br>
    Ruggero
    <p></p>
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