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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-Rodríguez, C. A. (författare)
- Departamento de Astronomía, Facultad de Ciencias Físicas y Matemáticas, Universidad de Concepción, Av. Esteban Iturra s/n Barrio Universitario, Casilla 160-C, Chile, Av. Esteban Iturra s/n Barrio Universitario
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- Käpylä, P. J. (författare)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Leibniz-Institut für Sonnenphysik (KIS), Schöneckstr. 6, 79104 Freiburg, Germany; Institut für Astrophysik und Geophysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany,Nordiska institutet för teoretisk fysik (Nordita)
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- Navarrete, F. H. (författare)
- Nordita SU; Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
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- Schleicher, D. R.G. (författare)
- Departamento de Astronomía, Facultad de Ciencias Físicas y Matemáticas, Universidad de Concepción, Av. Esteban Iturra s/n Barrio Universitario, Casilla 160-C, Chile, Av. Esteban Iturra s/n Barrio Universitario
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- Mennickent, R. E. (författare)
- Departamento de Astronomía, Facultad de Ciencias Físicas y Matemáticas, Universidad de Concepción, Av. Esteban Iturra s/n Barrio Universitario, Casilla 160-C, Chile, Av. Esteban Iturra s/n Barrio Universitario
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- Hidalgo, J. P. (författare)
- Departamento de Astronomía, Facultad de Ciencias Físicas y Matemáticas, Universidad de Concepción, Av. Esteban Iturra s/n Barrio Universitario, Casilla 160-C, Chile, Av. Esteban Iturra s/n Barrio Universitario
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- Toro-Velásquez, B. (författare)
- Departamento de Astronomía, Facultad de Ciencias Físicas y Matemáticas, Universidad de Concepción, Av. Esteban Iturra s/n Barrio Universitario, Casilla 160-C, Chile, Av. Esteban Iturra s/n Barrio Universitario
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- Navarro-Navarrete, José E., 1988- (författare)
- Stockholms universitet,Fysikum,Universität Hamburg, Germany
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Departamento de Astronomía, Facultad de Ciencias Físicas y Matemáticas, Universidad de Concepción, Av Esteban Iturra s/n Barrio Universitario, Casilla 160-C, Chile, Av. Esteban Iturra s/n Barrio Universitario Nordic Institute for Theoretical Physics NORDITA (creator_code:org_t)
- EDP Sciences, 2023
- 2023
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 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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https://urn.kb.se/re...
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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 Prot and magnetic Reynolds ReM and Prandlt numbers PrM. 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⊙ at three rotation rates corresponding to rotation periods (Prot) 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 PrM. For the simulations with Prot = 43 days and PrM ≤ 2, we found cyclic large-scale magnetic fields. For PrM > 2, the cycles vanish and the field shows irregular reversals. In the simulations with Prot = 61 days for PrM ≤ 2, the cycles are less clear and the reversal are less periodic. In the higher PrM cases, the axisymmetric mean field shows irregular variations. For the slowest rotation case with Prot = 90 days, the field has an important dipolar component for PrM ≤ 5. For the highest PrM 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 ReM.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Convection
- Dynamo
- Magnetohydrodynamics (MHD)
- Stars: low-mass
- Stars: magnetic field
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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