Multi-instrumental view of magnetic fields and activity of ϵ Eridani with SPIRou, NARVAL, and TESS
International audience Aims. We report on observations of the active K2 dwarf ϵ Eridani based on contemporaneous SPIRou, NARVAL and TESS data obtained over two months in late 2018, when the activity of the star was reported to be in a non-cyclic phase.Methods. Near-infrared (NIR) spectropolarimetry...
Published in: | Astronomy & Astrophysics |
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Main Authors: | , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2021
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Subjects: | |
Online Access: | https://hal.science/hal-03197552 https://hal.science/hal-03197552v2/document https://hal.science/hal-03197552v2/file/aa40027-20.pdf https://doi.org/10.1051/0004-6361/202040027 |
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Université Toulouse III - Paul Sabatier: HAL-UPS |
op_collection_id |
ftutoulouse3hal |
language |
English |
topic |
stars: activity stars: solar-type stars: magnetic field stars: rotation [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] |
spellingShingle |
stars: activity stars: solar-type stars: magnetic field stars: rotation [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] Petit, P. Folsom, C. P. Donati, J.-F. Yu, L. Do Nascimento, J.-D. Jeffers, S. V. Marsden, S. C. Morin, J. Vidotto, A. A. Multi-instrumental view of magnetic fields and activity of ϵ Eridani with SPIRou, NARVAL, and TESS |
topic_facet |
stars: activity stars: solar-type stars: magnetic field stars: rotation [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] |
description |
International audience Aims. We report on observations of the active K2 dwarf ϵ Eridani based on contemporaneous SPIRou, NARVAL and TESS data obtained over two months in late 2018, when the activity of the star was reported to be in a non-cyclic phase.Methods. Near-infrared (NIR) spectropolarimetry was obtained using SPIRou over four nights in late September, while visible spectropolarimetry was collected with NARVAL over 20 nights, spread between 18 September and 07 November. We first recovered the fundamental parameters of the target from both visible and NIR spectral fitting. The large-scale magnetic field was investigated from polarimetric data. From unpolarized spectra, we estimated the total magnetic flux through Zeeman broadening of magnetically sensitive NIR lines and the chromospheric emission using the CaII H&K lines. The photometric monitoring, secured with TESS between 19 October and 15 November, is modelled with pseudo-periodic Gaussian process regression.Results. Fundamental parameters of ϵ Eridani derived from visible and NIR wavelengths provide us with consistent results, which also agree with published values. We report a progressive increase of macroturbulence towards larger NIR wavelengths. Zeeman broadening of individual lines highlights an unsigned surface magnetic field Bmono = 1.90 ± 0.13 kG, with a filling factor f = 12.5 ± 1.7% (unsigned magnetic flux Bf = 237 ± 36 G). The large-scale magnetic field geometry, chromospheric emission and broadband photometry display clear signs of non-rotational evolution over the course of data collection. Characteristic decay times deduced from the light curve and longitudinal field fall in the range 30–40 days, while the characteristic timescale of surface differential rotation, as derived through the evolution of the magnetic geometry, is equal to 57 ± 5 days. The large-scale magnetic field exhibits a combination of properties not observed previously for ϵ Eridani, with a surface field among the weakest previously reported, but this field is also ... |
author2 |
Institut de recherche en astrophysique et planétologie (IRAP) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Royal Military College of Canada Universidade Federal do Rio Grande do Norte Natal (UFRN) Harvard-Smithsonian Center for Astrophysics (CfA) Harvard University-Smithsonian Institution Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research (MPS) Max-Planck-Gesellschaft University of Southern Queensland (USQ) Laboratoire Univers et Particules de Montpellier (LUPM) Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) Trinity College Dublin |
format |
Article in Journal/Newspaper |
author |
Petit, P. Folsom, C. P. Donati, J.-F. Yu, L. Do Nascimento, J.-D. Jeffers, S. V. Marsden, S. C. Morin, J. Vidotto, A. A. |
author_facet |
Petit, P. Folsom, C. P. Donati, J.-F. Yu, L. Do Nascimento, J.-D. Jeffers, S. V. Marsden, S. C. Morin, J. Vidotto, A. A. |
author_sort |
Petit, P. |
title |
Multi-instrumental view of magnetic fields and activity of ϵ Eridani with SPIRou, NARVAL, and TESS |
title_short |
Multi-instrumental view of magnetic fields and activity of ϵ Eridani with SPIRou, NARVAL, and TESS |
title_full |
Multi-instrumental view of magnetic fields and activity of ϵ Eridani with SPIRou, NARVAL, and TESS |
title_fullStr |
Multi-instrumental view of magnetic fields and activity of ϵ Eridani with SPIRou, NARVAL, and TESS |
title_full_unstemmed |
Multi-instrumental view of magnetic fields and activity of ϵ Eridani with SPIRou, NARVAL, and TESS |
title_sort |
multi-instrumental view of magnetic fields and activity of ϵ eridani with spirou, narval, and tess |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03197552 https://hal.science/hal-03197552v2/document https://hal.science/hal-03197552v2/file/aa40027-20.pdf https://doi.org/10.1051/0004-6361/202040027 |
genre |
narval narval |
genre_facet |
narval narval |
op_source |
ISSN: 0004-6361 EISSN: 1432-0756 Astronomy and Astrophysics - A&A https://hal.science/hal-03197552 Astronomy and Astrophysics - A&A, 2021, 648, pp.A55. ⟨10.1051/0004-6361/202040027⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/arxiv/2101.02643 info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/202040027 hal-03197552 https://hal.science/hal-03197552 https://hal.science/hal-03197552v2/document https://hal.science/hal-03197552v2/file/aa40027-20.pdf ARXIV: 2101.02643 doi:10.1051/0004-6361/202040027 INSPIRE: 1858287 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1051/0004-6361/202040027 |
container_title |
Astronomy & Astrophysics |
container_volume |
648 |
container_start_page |
A55 |
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1810486233469550592 |
spelling |
ftutoulouse3hal:oai:HAL:hal-03197552v2 2024-09-15T18:41:51+00:00 Multi-instrumental view of magnetic fields and activity of ϵ Eridani with SPIRou, NARVAL, and TESS Petit, P. Folsom, C. P. Donati, J.-F. Yu, L. Do Nascimento, J.-D. Jeffers, S. V. Marsden, S. C. Morin, J. Vidotto, A. A. Institut de recherche en astrophysique et planétologie (IRAP) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Royal Military College of Canada Universidade Federal do Rio Grande do Norte Natal (UFRN) Harvard-Smithsonian Center for Astrophysics (CfA) Harvard University-Smithsonian Institution Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research (MPS) Max-Planck-Gesellschaft University of Southern Queensland (USQ) Laboratoire Univers et Particules de Montpellier (LUPM) Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) Trinity College Dublin 2021 https://hal.science/hal-03197552 https://hal.science/hal-03197552v2/document https://hal.science/hal-03197552v2/file/aa40027-20.pdf https://doi.org/10.1051/0004-6361/202040027 en eng HAL CCSD EDP Sciences info:eu-repo/semantics/altIdentifier/arxiv/2101.02643 info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/202040027 hal-03197552 https://hal.science/hal-03197552 https://hal.science/hal-03197552v2/document https://hal.science/hal-03197552v2/file/aa40027-20.pdf ARXIV: 2101.02643 doi:10.1051/0004-6361/202040027 INSPIRE: 1858287 info:eu-repo/semantics/OpenAccess ISSN: 0004-6361 EISSN: 1432-0756 Astronomy and Astrophysics - A&A https://hal.science/hal-03197552 Astronomy and Astrophysics - A&A, 2021, 648, pp.A55. ⟨10.1051/0004-6361/202040027⟩ stars: activity stars: solar-type stars: magnetic field stars: rotation [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] info:eu-repo/semantics/article Journal articles 2021 ftutoulouse3hal https://doi.org/10.1051/0004-6361/202040027 2024-06-25T00:12:59Z International audience Aims. We report on observations of the active K2 dwarf ϵ Eridani based on contemporaneous SPIRou, NARVAL and TESS data obtained over two months in late 2018, when the activity of the star was reported to be in a non-cyclic phase.Methods. Near-infrared (NIR) spectropolarimetry was obtained using SPIRou over four nights in late September, while visible spectropolarimetry was collected with NARVAL over 20 nights, spread between 18 September and 07 November. We first recovered the fundamental parameters of the target from both visible and NIR spectral fitting. The large-scale magnetic field was investigated from polarimetric data. From unpolarized spectra, we estimated the total magnetic flux through Zeeman broadening of magnetically sensitive NIR lines and the chromospheric emission using the CaII H&K lines. The photometric monitoring, secured with TESS between 19 October and 15 November, is modelled with pseudo-periodic Gaussian process regression.Results. Fundamental parameters of ϵ Eridani derived from visible and NIR wavelengths provide us with consistent results, which also agree with published values. We report a progressive increase of macroturbulence towards larger NIR wavelengths. Zeeman broadening of individual lines highlights an unsigned surface magnetic field Bmono = 1.90 ± 0.13 kG, with a filling factor f = 12.5 ± 1.7% (unsigned magnetic flux Bf = 237 ± 36 G). The large-scale magnetic field geometry, chromospheric emission and broadband photometry display clear signs of non-rotational evolution over the course of data collection. Characteristic decay times deduced from the light curve and longitudinal field fall in the range 30–40 days, while the characteristic timescale of surface differential rotation, as derived through the evolution of the magnetic geometry, is equal to 57 ± 5 days. The large-scale magnetic field exhibits a combination of properties not observed previously for ϵ Eridani, with a surface field among the weakest previously reported, but this field is also ... Article in Journal/Newspaper narval narval Université Toulouse III - Paul Sabatier: HAL-UPS Astronomy & Astrophysics 648 A55 |