Subphotospheric fluctuations in magnetized radiative envelopes: contribution from unstable magnetosonic waves

Sen, Koushik; Fernández, Rodrigo; Socrates, Aristotle

doi:10.1093/mnras/sty736

Subphotospheric fluctuations in magnetized radiative envelopes: contribution from unstable magnetosonic waves

Journal Article · Wed Mar 21 00:00:00 EDT 2018 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/sty736· OSTI ID:1543983

Sen, Koushik ^[1]; Fernández, Rodrigo ^[2]; Socrates, Aristotle ^[3]

Univ. of Alberta, Edmonton, AB (Canada); Indian Inst. of Technology (IIT), Kharagpur (India)
Univ. of Alberta, Edmonton, AB (Canada)
Jackson, WY (United States)

We examine the excitation of unstable magnetosonic waves in the radiative envelopes of intermediate- and high-mass stars with a magnetic field of ~kG strength. Wind clumping close to the star and microturbulence can often be accounted for when including small-scale, subphotospheric density or velocity perturbations. Compressional waves – with wavelengths comparable to or shorter than the gas pressure scale height – can be destabilized by the radiative flux in optically thick media when a magnetic field is present, in a process called the radiation-driven magneto-acoustic instability (RMI). The instability does not require radiation or magnetic pressure to dominate over gas pressure, and acts independently of subsurface convection zones. Here we evaluate the conditions for the RMI to operate on a grid of stellar models covering a mass range 3–40 M_⊙ at solar metallicity. For a uniform 1 kG magnetic field, fast magnetosonic modes are unstable down to an optical depth of a few tens, while unstable slow modes extend beyond the depth of the iron convection zone. The qualitative behaviour is robust to magnetic field strength variations by a factor of a few. When combining our findings with previous results for the saturation amplitude of the RMI, we predict velocity fluctuations in the range ~0.1–10 kms^-1. These amplitudes are a monotonically increasing function of the ratio of radiation to gas pressure, or alternatively, of the zero-age main sequence mass.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1543983

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 2 Vol. 477; ISSN 0035-8711

Publisher:: Royal Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Subphotospheric fluctuations in magnetized radiative envelopes: contribution from unstable magnetosonic waves Sen, Koushik; Fernández, Rodrigo; Socrates, Aristotle https://doi.org/10.5281/zenodo.2605405 The current record documents this dataset	dataset	January 2019
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Subphotospheric fluctuations in magnetized radiative envelopes: contribution from unstable magnetosonic waves

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