POSYDON-code/POSYDON

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POSYDON is a next-generation single and binary-star population synthesis code incorporating full stellar structure and evolution modeling with the use of MESA.

Stars: 45
Forks: 37
Open beginner issues: 0
Indexed issues: 99
Avg merge: 8d 20h
Merged PRs (30d): 5

Dominant language: Python
License: BSD-3-Clause
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue help wanted

Beginner friendly Everything

Open All

99 open issues indexed

[BUG]: Issues with get-posydon-data Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

POSYDON-code/POSYDON#930 · Opened Sep 15, 2026
[FEATURE]: Add a multiprocessing backend for local parallel population runs Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

POSYDON-code/POSYDON#928 · 1 comment · Opened Sep 14, 2026
[BUG]: posydon-setup-grid Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

POSYDON-code/POSYDON#919 · 1 comment · Opened Aug 27, 2026
[BUG]: missing POSYDON_data download Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 48/100

POSYDON-code/POSYDON#916 · Opened Aug 26, 2026
[BUG]: dev-tools Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

POSYDON-code/POSYDON#915 · Opened Aug 26, 2026
[BUG]: ECSN h1 / he4 ejecta == NaN Open

discuss

Difficulty 4/5 3-5 days Newbie friendliness 48/100

POSYDON-code/POSYDON#914 · 1 comment · Opened Aug 25, 2026
[BUG]: `single_HMS_path` not set in default Open

enhancement

POSYDON-code/POSYDON#913 · 2 comments · 1 assignee · Opened Aug 25, 2026
[BUG]: step_DCO solver edge case Open

discuss

Difficulty 4/5 3-5 days Newbie friendliness 48/100

POSYDON-code/POSYDON#912 · 1 comment · Opened Aug 25, 2026
[BUG]: SN_MODELS plotting Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

POSYDON-code/POSYDON#910 · Opened Aug 25, 2026
[BUG]: pop.evolve() multiple causes binaries Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 64/100

POSYDON-code/POSYDON#906 · Opened Aug 24, 2026
Audit and fix legacy bondi_hoyle implementation bugs Open

bug

POSYDON-code/POSYDON#888 · 1 assignee · Opened Aug 14, 2026
Consolidate duplicated XRB wind and BHL utilities Open

discuss

POSYDON-code/POSYDON#887 · 1 assignee · Opened Aug 14, 2026
Add a worked tutorial for the XRB luminosity utilities Open

documentation

POSYDON-code/POSYDON#886 · 1 assignee · Opened Aug 14, 2026
[BUG]: inlist_step2 not created for single_HeMS Open

bug

POSYDON-code/POSYDON#876 · 1 comment · 1 assignee · Opened Aug 6, 2026
[BUG]: post-CE binaries have "initial_RLO" Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

POSYDON-code/POSYDON#874 · 1 comment · Opened Jul 23, 2026
Possible inconsistency in merger-product helium core mass after stellar merger in POSYDON v2.2.8 Open

discuss question wontfix

Difficulty 4/5 3-5 days Newbie friendliness 48/100

POSYDON-code/POSYDON#847 · 3 comments · Opened May 15, 2026
Incomplete calculation of the Bondi-Hoyle accretion rate Open

P2 - medium priority

Difficulty 4/5 3-5 days Newbie friendliness 30/100

POSYDON-code/POSYDON#829 · 1 comment · Opened Mar 26, 2026
[BUG]: Using the `HMS_HMS_RLO` grid, breaks `calculate_formation_channels` Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

POSYDON-code/POSYDON#828 · Opened Mar 23, 2026
[BUG]: Luminosity of a star is Nan Open

bug discuss

POSYDON-code/POSYDON#816 · 2 comments · 3 assignees · Opened Mar 6, 2026
[FEATURE]: change CC1/CC2 to END1/END2 Open

discuss

Difficulty 3/5 1-2 days Newbie friendliness 35/100

POSYDON-code/POSYDON#791 · 2 comments · Opened Jan 28, 2026
[FEATURE]: SN_type defintion to distinguish between failed and successful SNe Open

discuss enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

POSYDON-code/POSYDON#790 · Opened Jan 28, 2026
[BUG]: Is singlestar.metallicity the absolute mass fraction of metals, or the ratio to solar fraction? Open

documentation question

POSYDON-code/POSYDON#787 · 1 comment · 3 assignees · Opened Jan 16, 2026
[BUG]: star_1.spin_orbit_tilt_second_SN's range is defined differently from other tilts. Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

POSYDON-code/POSYDON#748 · Opened Oct 27, 2025
[BUG]: overflow warning `step_CEE` Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 52/100

POSYDON-code/POSYDON#745 · 3 comments · Opened Oct 24, 2025
[BUG]: Another Binary Step Exceeded Allotted Time: 120 Open

bug

POSYDON-code/POSYDON#741 · 2 comments · 1 assignee · Opened Oct 24, 2025
[BUG]: `SimulationProperties.from_ini()` error Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 38/100

POSYDON-code/POSYDON#733 · 1 comment · Opened Oct 16, 2025
[BUG]: the `BinaryStar_output` and `SingleStar_1_output` ignored Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 48/100

POSYDON-code/POSYDON#732 · Opened Oct 16, 2025
[BUG]: scalar output is None pytables error Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

POSYDON-code/POSYDON#707 · Opened Sep 25, 2025
[BUG]: rename "selection_function" for TransientPopulation creation Open

bug documentation enhancement question

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

POSYDON-code/POSYDON#703 · Opened Sep 22, 2025
[BUG]: Downloaded data, redownloaded Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 25/100

POSYDON-code/POSYDON#696 · Opened Sep 18, 2025
[BUG]: data_scaling overflow encountered in power. Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

POSYDON-code/POSYDON#668 · Opened Aug 25, 2025
Different common envelope stripping depending on the phase, where merger happens Open

bug discuss enhancement

POSYDON-code/POSYDON#603 · 3 assignees · Opened May 21, 2025
Check total_mass_h1 and total_mass_he4 in matching procedure after step_CEE Open

POSYDON-code/POSYDON#592 · 1 assignee · Opened May 6, 2025
Supernova model parameters as input for the interpolators Open

discuss enhancement

POSYDON-code/POSYDON#590 · 2 assignees · Opened May 6, 2025
Use of machine learning techniques for the matching Open

discuss enhancement

POSYDON-code/POSYDON#589 · 2 assignees · Opened May 6, 2025
Change sampling to allow binary and single stars to be sampled at the same time Open

discuss enhancement

POSYDON-code/POSYDON#586 · 2 assignees · Opened May 2, 2025
documentation on simultaneous population runs Open

documentation

POSYDON-code/POSYDON#583 · 1 assignee · Opened Apr 30, 2025
Implement the new Maltsev+ "optimistic" SN prescription Open

discuss enhancement

POSYDON-code/POSYDON#572 · 1 comment · 1 assignee · Opened Apr 9, 2025
Documentation for post-processing pipeline needs to be clarified Open

documentation enhancement

POSYDON-code/POSYDON#567 · 1 comment · 2 assignees · Opened Apr 3, 2025
Secondary mass vs. mass ratio Open

discuss enhancement good first issue

Difficulty 5/5 Over a week Newbie friendliness 25/100

POSYDON-code/POSYDON#565 · Opened Apr 2, 2025
Move bin code to utils: posydon-setup-popsyn/posydon-popsyn Open

enhancement

POSYDON-code/POSYDON#563 · 1 assignee · Opened Mar 31, 2025
Move bin code to utils: posydon-setup-pipeline and posydon-run-pipeline Open

enhancement

POSYDON-code/POSYDON#562 · 1 assignee · Opened Mar 31, 2025
Move bin code to utils: posydon-setup-grid and posydon-run-grid Open

enhancement

POSYDON-code/POSYDON#561 · 1 comment · 2 assignees · Opened Mar 31, 2025
[BUG]: Failed binaries in stop at condition in step MESA Open

bug

POSYDON-code/POSYDON#555 · 5 comments · 2 assignees · Opened Mar 27, 2025
[BUG/Follow up]: `solve_ivp()` error during binary evolution Open

bug question

POSYDON-code/POSYDON#549 · 1 comment · 2 assignees · Opened Mar 20, 2025
Suggestion of an update of the equilibrium tide model Open

discuss enhancement good first issue v3 feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

POSYDON-code/POSYDON#506 · 1 comment · 1 reaction · Opened Feb 7, 2025
Remove hard coded values Open

discuss enhancement good first issue help wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

POSYDON-code/POSYDON#503 · Opened Feb 5, 2025
Implement the feature of MS+MS mergers from Schneider et al. Open

enhancement

POSYDON-code/POSYDON#498 · 1 reaction · 2 assignees · Opened Jan 30, 2025
Error encountered with LinearNDInterpolator Open

duplicate help wanted question

POSYDON-code/POSYDON#492 · 2 comments · 2 assignees · Opened Jan 23, 2025
Invalid scenario system type silent errors during grid setup Open

enhancement v2 feature

POSYDON-code/POSYDON#490 · 2 comments · 4 assignees · Opened Jan 22, 2025

POSYDON-code/POSYDON

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