[mesa-users] Building stars via accretion with MESA

[Sergei Nayakshin]

Hi Masanobu,

I’d be quite interested to see the preprint, when it’s available, as the age of the star is also very important for planet formation (that I’m working on). One comment to make is that, for the second core of lowest masses, you may need to add the age of the second core to your age estimate of the star. Second cores of ~ 1 Jupiter masses go through H2 dissociation collapse after radiatively cooling for ~ 1 Myr (Bodenheimer 1974, but the result strongly depends on the dust opacity), so it may not be negligible. At 5-10 Jupiter masses and above, however, the cooling time is very short, of order 10^4 years, so then the second core formation is essentially instantaneous.

Cheers,
Sergei.


> On 8 Sep 2015, at 08:54, Masanobu Kunitomo <kunitomo.masanobu at c.mbox.nagoya-u.ac.jp> wrote:
> 
> Dear Richard,
> 
> I will submit a paper on this subject shortly! Our work is similar to Baraffe et al. (2009, 2012) and Hosokawa et al. (2011), i.e., considering the accretion from a second core (~1-10 Mjup) to the final mass raging 0.05 to 1Msun and the heat injection by accretion parameterized with the “energy_routine” in src/run_star_extras.f. If you have any questions, I’ll be pleased to help.
> 
> Cheers,
> Masanobu
> 
> 
> --
> Masanobu Kunitomo, Ph.D.
> Department of Physics, Nagoya University
> Furo-cho, Chikusa-ku, Nagoya, Aichi,  464-8602, Japan
> Email: kunitomo.masanobu at c.mbox.nagoya-u.ac.jp <mailto:kunitomo.masanobu at c.mbox.nagoya-u.ac.jp>
> 
> 
> 
> 
> 
> 
> 
> 
> 
>> On Sep 8, 2015, at 16:14, Richard Townsend <rhtownsend at icloud.com <mailto:rhtownsend at icloud.com>> wrote:
>> 
>> Hi folks —
>> 
>> I’d like to see if I can use MESA to build up a star by accretion — basically, start with an adiabatic core with mass ~ Mjupiter, and then accrete mass (following some prescription) until it reaches its final mass and then contracts onto the main sequence.
>> 
>> Does anyone have any words of wisdom about this — things to watch out for with MESA, previous experiences with MESA or other codes, pointers?
>> 
>> Many thanks,
>> 
>> Rich
>> 
>> 
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