Dataset Open Access

Detecting axisymmetric magnetic fields using gravity modes in intermediate-mass stars

Van Beeck, Jordan; Prat, Vincent; Van Reeth, Timothy; Mathis, Stéphane; Bowman, Dominic M.; Neiner, Coralie; Aerts, Conny

Researcher(s)
Michielsen, Mathias; Pedersen, May G.; Johnston, C.

Typical MESA and GYRE inlists associated with Van Beeck et al. (2020). MESA version 10398 and GYRE version 5.2.

Context: Angular momentum (AM) transport models of stellar interiors require improvements to explain the strong extraction of AM from stellar cores that is observed with asteroseismology. One of the often invoked mediators of AM transport are internal magnetic fields, even though their properties, observational signatures and influence on stellar evolution are largely unknown.

Aims: We study how a fossil, axisymmetric internal magnetic field affects period spacing patterns of dipolar gravity mode oscillations in main-sequence stars with masses of 1.3, 2.0 and 3.0 \(\mathrm{M}_{\odot}\) . We assess the influence of fundamental stellar parameters on the magnitude of pulsation mode frequency shifts.

Methods: We compute dipolar gravity mode frequency shifts due to a fossil, axisymmetric poloidal-toroidal internal magnetic field for a grid of stellar evolution models, varying stellar fundamental parameters. Rigid rotation is taken into account using the traditional approximation of rotation and the influence of the magnetic field is computed using a perturbative approach.

Results: We find magnetic signatures for dipolar gravity mode oscillations in terminal-age main-sequence stars that are measurable for a near-core field strength larger than 105 G. The predicted signatures differ appreciably from those due to rotation.

Conclusions: Our formalism demonstrates the potential for the future detection and characterization of strong fossil, axisymmetric internal magnetic fields in gravity-mode pulsators near the end of core-hydrogen burning from Kepler photometry, if such fields exist.

The publication date is the date of acceptance.

J. Van Beeck would like to thank researchers M. Michielsen, C. Johnston, and dr. M. G. Pedersen for their valuable input in the MESA and GYRE computations.

Files (106.0 kB)
Name Size
history_columns_changed_JVB.list
md5:fd838be91cdd134c8dd16d6b655be6cf
38.7 kB Download
inlist
md5:4f79734cfcf2d1b87fab14a405739e17
278 Bytes Download
inlist_JVB_grid
md5:70ca9785c4393f0a54949cff386e53d6
14.1 kB Download
pp_cno_extras_o18_ne22_extraiso.net
md5:eaa44097eeb17e3761dc167d50101206
281 Bytes Download
profile_columns_changed_JVB.list
md5:2562ece9d46bddda4f84cfcf14cba925
26.0 kB Download
run_star_extras.f
md5:eb31756ad5f33b60a8c304a0cd10bfca
23.7 kB Download
typical_gyre_inlist.in
md5:6e62f6a52a6367e2b1ae40c8d56854ab
3.0 kB Download
38
24
views
downloads
All versions This version
Views 3833
Downloads 2422
Data volume 383.2 kB341.8 kB
Unique views 2927
Unique downloads 119

Share

Cite as