Fwd: 有人请求加入“posydon-users”群组

[Tassos Fragos]

Hello,

On 23 Nov 2023, at 08:09, posydon-users <posydon-us...@googlegroups.com> wrote:

I am a graduate student in the field of astrophysics, currently exploring the utilization of the Posydon code. I am keen on gaining a deeper understanding of the population-synthesis module. Specifically, I am interested in knowing if it is possible to customize the output when using this module. For instance, I would like to inquire about the feasibility of outputting compactness data from MESA. Thank you for considering my application.

We are happy to hear that you are interested in POSYDON. You can certainly customize the output of the population. The best way to do that is the use the “other_hooks” functionality (see here ) to add save more properties in the history of the binary object.

However, I should say note that both the single-  and binary-star grids in POSYDON are run till central carbon exhaustion and thus you cannot directly calculate compactness parameters. For that, you would need to evolve the star till the iron core collapses. alternatively, one can use approximate proxies for the final compactness parameters from earlier evolutionary phases, like what is described in Patton and Sukhbold (2020). That you should be able to include in the POSYDON output, as we are saving the relevant quantities. 

Another approach would be to try to run your own grids using the POSYDON infrastructure, which you would evolve till iron core-collapse. That would be a much more involved project though.

Best wishes,

Tassos

 

[李磊]

Dear Tassos,

Thanks for your reply! I believe that exploring the use of approximate proxies, as suggested by Patton and Sukhbold (2020), could be a promising solution.

Currently, I am actively engaged in utilizing the latest development version of POSYDON, which I downloaded from GitHub. My learning process involves working through the provided example "10_binaries_pop_syn.ipynb" However, I have encountered an issue during the execution of the second step, specifically at the line of code synth_pop.evolve(). The error message I received is as follows:

unable to open file: name = '/home/llvm/POSYDON-development/data/POSYDON_data/POSYDON_data/HMS-HMS/1e-04_Zsun.h5', errno = 2, error message = 'No such file or directory', flags = 0, o_flags = 0

I confirmed that the downloaded data corresponds to the description in the data_download.py script, containing a compressed package with the record ID 6655751. However, upon further inspection, it seems that the required .h5 files are missing in the HMS-HMS folder. I am uncertain whether this issue stems from interpolation problems or if there might be an error in my compilation process. Or simply because need v2.0.0 dataset here.

I would greatly appreciate any guidance or assistance you could provide in resolving this issue. If there are additional steps or considerations I should take to ensure a successful run of the code, please do let me know.

Thank you once again for your support, and I look forward to your insights on this matter.

Best regards

Lei Li