Mass, gas, and Gauss around a T Tauri Star with SPIRou J.-F. Donati, E. Gaidos, C. Moutou, P. I. Cristofari, L. Arnold, M. G. Barber and A. W. Mann A&A, 698 (2025) L14 Published online: 06 June 2025 DOI: 10.1051/0004-6361/202554628