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Simulations of dyna...
Simulations of dynamo action in slowly rotating M dwarfs : Dependence on dimensionless parameters
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Ortiz-Rodriguez, C. A. (författare)
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- Käpylä, Petri J. (författare)
- Stockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Leibniz-Institut für Sonnenphysik, Germany
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- Navarro-Navarrete, José E., 1988- (författare)
- Stockholms universitet,Fysikum,Universität Hamburg, Germany
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Schleicher, D. R. G. (författare)
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Mennickent, R. E. (författare)
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Hidalgo, J. P. (författare)
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Toro-Velasquez, B. (författare)
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(creator_code:org_t)
- 2023
- 2023
- Engelska.
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Ingår i: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 678
- Relaterad länk:
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Aims. The aim of this study is to explore the magnetic and flow properties of fully convective M dwarfs as a function of rotation period P-rot and magnetic Reynolds Re-M and Prandlt numbers Pr-M.Methods. We performed three-dimensional simulations of fully convective stars using a star-in-a-box set-up. This set-up allows global dynamo simulations in a sphere embedded in a Cartesian cube. The equations of non-ideal magnetohydrodynamics were solved with the PENCIL CODE. We used the stellar parameters of an M5 dwarf with 0.21 M-circle dot at three rotation rates corresponding to rotation periods (P-rot) of 43, 61, and 90 days, and varied the magnetic Prandtl number in the range from 0.1 to 10.Results. We found systematic differences in the behaviour of the large-scale magnetic field as functions of rotation and Pr-M. For the simulations with P-rot = 43 days and Pr-M <= 2, we found cyclic large-scale magnetic fields. For Pr-M > 2, the cycles vanish and the field shows irregular reversals. In the simulations with P-rot = 61 days for Pr-M <= 2, the cycles are less clear and the reversal are less periodic. In the higher Pr-M cases, the axisymmetric mean field shows irregular variations. For the slowest rotation case with P-rot = 90 days, the field has an important dipolar component for Pr-M <= 5. For the highest Pr-M the large-scale magnetic field is predominantly irregular at mid-latitudes, with quasi-stationary fields near the poles. For the simulations with cycles, the cycle period length slightly increases with increasing Re-M.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- convection
- dynamo
- stars: magnetic field
- stars: low-mass
- magnetohydrodynamics (MHD)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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