Large-scale magnetic topologies of mid M dwarfs

J. Morin; J. F. Donati; P. Petit; X. Delfosse; T. Forveille; L. Albert; M. Aurière; R. Cabanac; B. Dintrans; R. Fares; T. Gastine; M. M. Jardine; F. Lignières; F. Paletou; J. C.Ramirez Velez; S. Théado

doi:10.1111/j.1365-2966.2008.13809.x

Large-scale magnetic topologies of mid M dwarfs

J. Morin, J. F. Donati, P. Petit, X. Delfosse, T. Forveille, L. Albert, M. Aurière, R. Cabanac, B. Dintrans, R. Fares, T. Gastine, M. M. Jardine, F. Lignières, F. Paletou, J. C.Ramirez Velez, S. Théado

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296 Citations (Scopus)

Abstract

We present in this paper, the first results of a spectropolarimetric analysis of a small sample (∼20) of active stars ranging from spectral type M0 to M8, which are either fully convective or possess a very small radiative core. This study aims at providing new constraints on dynamo processes in fully convective stars. This paper focuses on five stars of spectral type ∼M4, i.e. with masses close to the full convection threshold (≃0.35 M _⊙), and with short rotational periods. Tomographic imaging techniques allow us to reconstruct the surface magnetic topologies from the rotationally modulated time-series of circularly polarized profiles. We find that all stars host mainly axisymmetric large-scale poloidal fields. Three stars were observed at two different epochs separated by ∼1 yr; we find the magnetic topologies to be globally stable on this time-scale. We also provide an accurate estimation of the rotational period of all stars, thus allowing us to start studying how rotation impacts the large-scale magnetic field.

Original language	English
Pages (from-to)	567-581
Number of pages	15
Journal	Monthly Notices of the Royal Astronomical Society
Volume	390
Issue number	2
DOIs	https://doi.org/10.1111/j.1365-2966.2008.13809.x
Publication status	Published - Oct 2008
Externally published	Yes

Keywords

Stars: activity
Stars: low-mass, brown dwarfs
Stars: magnetic fields
Stars: rotation
Techniques: polarimetric

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1111/j.1365-2966.2008.13809.x

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Morin, J., Donati, J. F., Petit, P., Delfosse, X., Forveille, T., Albert, L., Aurière, M., Cabanac, R., Dintrans, B., Fares, R., Gastine, T., Jardine, M. M., Lignières, F., Paletou, F., Velez, J. C. R., & Théado, S. (2008). Large-scale magnetic topologies of mid M dwarfs. Monthly Notices of the Royal Astronomical Society, 390(2), 567-581. https://doi.org/10.1111/j.1365-2966.2008.13809.x

Morin, J, Donati, JF, Petit, P, Delfosse, X, Forveille, T, Albert, L, Aurière, M, Cabanac, R, Dintrans, B, Fares, R, Gastine, T, Jardine, MM, Lignières, F, Paletou, F, Velez, JCR & Théado, S 2008, 'Large-scale magnetic topologies of mid M dwarfs', Monthly Notices of the Royal Astronomical Society, vol. 390, no. 2, pp. 567-581. https://doi.org/10.1111/j.1365-2966.2008.13809.x

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doi = "10.1111/j.1365-2966.2008.13809.x",

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AU - Morin, J.

AU - Donati, J. F.

AU - Petit, P.

AU - Delfosse, X.

AU - Forveille, T.

AU - Albert, L.

AU - Aurière, M.

AU - Cabanac, R.

AU - Dintrans, B.

AU - Fares, R.

AU - Gastine, T.

AU - Jardine, M. M.

AU - Lignières, F.

AU - Paletou, F.

AU - Velez, J. C.Ramirez

AU - Théado, S.

PY - 2008/10

Y1 - 2008/10

N2 - We present in this paper, the first results of a spectropolarimetric analysis of a small sample (∼20) of active stars ranging from spectral type M0 to M8, which are either fully convective or possess a very small radiative core. This study aims at providing new constraints on dynamo processes in fully convective stars. This paper focuses on five stars of spectral type ∼M4, i.e. with masses close to the full convection threshold (≃0.35 M ⊙), and with short rotational periods. Tomographic imaging techniques allow us to reconstruct the surface magnetic topologies from the rotationally modulated time-series of circularly polarized profiles. We find that all stars host mainly axisymmetric large-scale poloidal fields. Three stars were observed at two different epochs separated by ∼1 yr; we find the magnetic topologies to be globally stable on this time-scale. We also provide an accurate estimation of the rotational period of all stars, thus allowing us to start studying how rotation impacts the large-scale magnetic field.

AB - We present in this paper, the first results of a spectropolarimetric analysis of a small sample (∼20) of active stars ranging from spectral type M0 to M8, which are either fully convective or possess a very small radiative core. This study aims at providing new constraints on dynamo processes in fully convective stars. This paper focuses on five stars of spectral type ∼M4, i.e. with masses close to the full convection threshold (≃0.35 M ⊙), and with short rotational periods. Tomographic imaging techniques allow us to reconstruct the surface magnetic topologies from the rotationally modulated time-series of circularly polarized profiles. We find that all stars host mainly axisymmetric large-scale poloidal fields. Three stars were observed at two different epochs separated by ∼1 yr; we find the magnetic topologies to be globally stable on this time-scale. We also provide an accurate estimation of the rotational period of all stars, thus allowing us to start studying how rotation impacts the large-scale magnetic field.

KW - Stars: activity

KW - Stars: low-mass, brown dwarfs

KW - Stars: magnetic fields

KW - Stars: rotation

KW - Techniques: polarimetric

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Large-scale magnetic topologies of mid M dwarfs

Abstract

Keywords

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