Inquiry about extending POSYDON grids

[aaa q]

Hello,

I am a graduate student currently considering using POSYDON to model the evolution of low-mass compact binaries. However, I noticed that the default setup of POSYDON primarily covers evolutionary grids for massive stars.

I would like to ask whether POSYDON provides functionality to extend or incorporate user-generated grids in order to support binary evolution in other mass ranges. If such functionality exists, could you please provide some guidance on how to properly implement it within the POSYDON framework?

Thanks

Jayanand Maurya

[Jeff Andrews]

Jayanand,

Great to hear you're interested in using POSYDON. You are correct that the code and grids are currently designed for high mass stars. Our primary mass limit extends down to 4 solar masses, but if you'd like to model stars less-massive than this, you are correct that you will need to run your own grids and import them. We have designed POSYDON to be able to handle user-imported grids (see documentation here), but we should coordinate, as there are likely some specific formatting requirements (e.g., specific output columns) that you will need to make sure your grids follow.

To get started, I suggest you make a post on our GitHub discussions page and we'll work with you to figure it out for your use case.

-Jeff

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[aaa q]

Jeff,

Thank you for your reply! Recently, I’ve been organizing the tables I need to extend and reading through POSYDON V1 and V2. I also have a question: if we extend the grid, will it take a lot of time? And if it does take a lot of time, wouldn’t we have to start over every time we change one of the formulas?

Jayanand

[aaa q]

Jeff,

Thank you for your reply! Recently, I’ve been organizing the tables I need to extend and reading through POSYDON V1 and V2. I also have a question: if we extend the grid, will it take a lot of time? And if it does take a lot of time, wouldn’t we have to start over every time we change one of the formulas?

Jayanand

在2025年9月5日星期五 UTC+8 01:22:24<Jeff Andrews> 写道：

[Anastasios Fragkos]

Dear Jayanand,

Indeed building new grids or extensions of currents grids require significant computational resources (over the order of ~1M cpu hours, depending on what one needs to do) and strong expertise with MESA. You should consider it a trivial part of such a project, but rather, perhaps the most challenging one.

Best wishes,

Tassos

To view this discussion visit https://groups.google.com/d/msgid/posydon-users/7c24bef5-c757-4f5d-b5b5-f6d3ebda8d36n%40googlegroups.com.

[aaa q]

Tassos,

I’m sorry for only seeing your reply now, and thank you for getting back to me.
For me personally, expanding the parameter grid is indeed not very realistic, and I’ve recently decided to abandon this idea.
I still sincerely appreciate your team’s contributions to stellar evolution research.

Jayanand