The "Double M" Project: The Impact of Magnetism and Multiplicity on the Evolution of Massive Stars

Research Project

Project/Area Number	23K19071
Research Category	Grant-in-Aid for Research Activity Start-up
Allocation Type	Multi-year Fund
Review Section	0204:Astronomy, earth and planetary science, and related fields
Research Institution	National Astronomical Observatory of Japan
Principal Investigator	Keszthelyi Zsolt 国立天文台, 天文シミュレーションプロジェクト, 特任研究員 (00978546)
Project Period (FY)	2023-08-31 – 2025-03-31
Project Status	Granted (Fiscal Year 2023)
Budget Amount *help	¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000) Fiscal Year 2024: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000) Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywords	massive stars / stellar magnetic fields / stellar multiplicity / population synthesis / stellar evolution / magnetic fields / binaries
Outline of Research at the Start	How do surface fossil magnetic fields impact single and binary massive star evolution and pathways toward gravitational-wave events? I will use state-of-the-art stellar evolution and population synthesis models to tackle this question.
Outline of Annual Research Achievements	Magnetic fields play an important role in the evolution of massive stars (those with initial masses above 8 solar masses). This project aims to combine numerical and observational results to further our understanding. I visited collaborators at the IAC, Spain. With collaborators from Japan, Germany and the US, we are submitting a paper to MNRAS. This includes the extension of magnetic stellar evolution models to low-metallicity environments. I disseminated research results at national and international conferences (EAYAM, ASJ Spring Annual Meeting, NAOJ Division of Science, Magnetic fields from clouds to stars: Bfields-2024). With collaborators in Austria and the US, we are further progressing with a population synthesis study.
Current Status of Research Progress	Current Status of Research Progress 2: Research has progressed on the whole more than it was originally planned. Reason The project is progressing.
Strategy for Future Research Activity	The project will continue as expected.