article published yes Lukas Einramhof author f1497a1a-72ef-11ef-b75a-fd877bbf6e8c Lisa Annabelle Bugnet author d9edb345-f866-11ec-9b37-d119b52345010000-0003-0142-4000 L. M. Calcaferro author Lucas Barrault author 4471a8fd-32c1-11ee-a9a4-fb670d398f64 S. B. Das author LiBu department GradSch department Unveiling the mysteries of stellar dynamics: a pioneering journey in magnetoasteroseismology project Unveiling the structure and dynamics of the deep convective core - radiative zone boundary throughout stellar evolution project The detection of strong, large-scale magnetic fields at the surfaces of the oldest white dwarfs might point toward a hidden internal magnetic field slowly rising to the surface. In addition, strong magnetic fields have recently been measured through asteroseismology in the radiative interiors of red giant stars, the progenitors of white dwarfs. To investigate the potential connection between these observations, we revisited the fossil field framework using asteroseismic detections to constrain the strength of such magnetic fields as red giants evolve into the white dwarf stage. We assumed that the magnetic field was either created during the core convection on the main sequence or that it fills the radiative interior as the star evolves on the red giant branch. From these initial conditions, we evolved the magnetic flux, allowing for magnetic diffusion along the evolution of a modeled 1.5 M⊙ star. We find that measured field strengths in red giants attributed to the hydrogen-burning shell are compatible with the field amplitudes and emergence timescales of magnetized white dwarfs. On the contrary, magnetic fields generated solely from a convective-core dynamo on the main sequence and detectable on the red giant branch would be buried too deep in the star and would not match the breakout timescales or the field strengths of magnetic white dwarfs. Therefore, for us to connect magnetic fields observed along the late evolution of stars via a fossil field we would need to find a broadly magnetized internal radiative zone on the red giant branch. https://research-explorer.ista.ac.at/download/22663/22671/2026_AstronomyAstrophysics_Einramhof.pdf application/pdfno EDP Sciences2026 eng 0004-6361 1432-0746 2601.1520310.1051/0004-6361/202659069 708 Einramhof, L., Bugnet, L. A., Calcaferro, L. M., Barrault, L., &#38; Das, S. B. (2026). Magneto-archeology of white dwarfs. <i>Astronomy &#38; Astrophysics</i>. EDP Sciences. <a href="https://doi.org/10.1051/0004-6361/202659069">https://doi.org/10.1051/0004-6361/202659069</a> Einramhof, Lukas, et al. “Magneto-Archeology of White Dwarfs.” <i>Astronomy &#38; Astrophysics</i>, vol. 708, L14, EDP Sciences, 2026, doi:<a href="https://doi.org/10.1051/0004-6361/202659069">10.1051/0004-6361/202659069</a>. L. Einramhof, L.A. Bugnet, L.M. Calcaferro, L. Barrault, S.B. Das, Astronomy &#38; Astrophysics 708 (2026). Einramhof L, Bugnet LA, Calcaferro LM, Barrault L, Das SB. Magneto-archeology of white dwarfs. <i>Astronomy &#38; Astrophysics</i>. 2026;708. doi:<a href="https://doi.org/10.1051/0004-6361/202659069">10.1051/0004-6361/202659069</a> L. Einramhof, L. A. Bugnet, L. M. Calcaferro, L. Barrault, and S. B. Das, “Magneto-archeology of white dwarfs,” <i>Astronomy &#38; Astrophysics</i>, vol. 708. EDP Sciences, 2026. Einramhof L, Bugnet LA, Calcaferro LM, Barrault L, Das SB. 2026. Magneto-archeology of white dwarfs. Astronomy &#38; Astrophysics. 708, L14. Einramhof, Lukas, Lisa Annabelle Bugnet, L. M. Calcaferro, Lucas Barrault, and S. B. Das. “Magneto-Archeology of White Dwarfs.” <i>Astronomy &#38; Astrophysics</i>. EDP Sciences, 2026. <a href="https://doi.org/10.1051/0004-6361/202659069">https://doi.org/10.1051/0004-6361/202659069</a>. 226632026-08-10T07:53:32Z2026-08-11T05:49:20Z