Mitigating stellar activity jitter with different line lists for least-squares deconvolution
International audience Context. Stellar activity limits the radial velocity (RV) search and characterisation of exoplanets, as it introduces spurious noise (called jitter) in the data sets and prevents the correct retrieval of a planetary signal. This is key for M dwarfs, considering that they manif...
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
2022
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Online Access: | https://hal.science/hal-03533666 https://hal.science/hal-03533666/document https://hal.science/hal-03533666/file/aa41812-21.pdf https://doi.org/10.1051/0004-6361/202141812 |
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Université de Nantes: HAL-UNIV-NANTES |
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ftunivnantes |
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English |
topic |
stars: activity methods: data analysis techniques: polarimetric techniques: radial velocities [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
spellingShingle |
stars: activity methods: data analysis techniques: polarimetric techniques: radial velocities [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Bellotti, S. Petit, P. Morin, J. Hussain, G. A. J. Folsom, C. P. Carmona, A. Delfosse, X. Moutou, C. Mitigating stellar activity jitter with different line lists for least-squares deconvolution |
topic_facet |
stars: activity methods: data analysis techniques: polarimetric techniques: radial velocities [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
description |
International audience Context. Stellar activity limits the radial velocity (RV) search and characterisation of exoplanets, as it introduces spurious noise (called jitter) in the data sets and prevents the correct retrieval of a planetary signal. This is key for M dwarfs, considering that they manifest high activity levels and are primary targets for present and future searches of habitable Earth-like planets. To perform precise RV measurements, multi-line numerical techniques like cross-correlation and least-squares deconvolution (LSD) are typically employed.Aims. Effective filtering of activity is crucial to achieving the sensitivity required for small planet detections. Here we analyse the impact of selecting different line lists for LSD on the dispersion in our RV data sets, to identify the line list that most effectively reduces the jitter.Methods. We employ optical spectropolarimetric observations of the active M dwarf EV Lac collected with ESPaDOnS and NARVAL, and study two line down-selection approaches: a parametric method based on line properties (depth, wavelength, magnetic sensitivity) and a randomised algorithm that samples the line combination space. We test the latter further to find the line list that singles out the activity signal from other sources of noise, and on AD Leo and DS Leo to examine its consistency at mitigating jitter for different activity levels. The analysis is complemented with planetary injection tests.Results. The parametric selection yields a RV RMS reduction of less than 10%, while the randomised selection yields a systematic improvement (>50%) regardless of the activity level of the star examined. Furthermore, if activity is the dominant source of noise, this approach allows the construction of lists containing mainly activity-sensitive lines, which could be used to enhance the rotational modulation of the resulting data sets and determine the stellar rotation period more robustly. Finally, the output line lists allow the recovery of a synthetic planet (0.3–0.6 MJup ... |
author2 |
Institut de recherche en astrophysique et planétologie (IRAP) Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-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 Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-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) Laboratoire Univers et Particules de Montpellier (LUPM) Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM) Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) Centre National d'Études Spatiales Toulouse (CNES)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ) Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France -Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France |
format |
Article in Journal/Newspaper |
author |
Bellotti, S. Petit, P. Morin, J. Hussain, G. A. J. Folsom, C. P. Carmona, A. Delfosse, X. Moutou, C. |
author_facet |
Bellotti, S. Petit, P. Morin, J. Hussain, G. A. J. Folsom, C. P. Carmona, A. Delfosse, X. Moutou, C. |
author_sort |
Bellotti, S. |
title |
Mitigating stellar activity jitter with different line lists for least-squares deconvolution |
title_short |
Mitigating stellar activity jitter with different line lists for least-squares deconvolution |
title_full |
Mitigating stellar activity jitter with different line lists for least-squares deconvolution |
title_fullStr |
Mitigating stellar activity jitter with different line lists for least-squares deconvolution |
title_full_unstemmed |
Mitigating stellar activity jitter with different line lists for least-squares deconvolution |
title_sort |
mitigating stellar activity jitter with different line lists for least-squares deconvolution |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-03533666 https://hal.science/hal-03533666/document https://hal.science/hal-03533666/file/aa41812-21.pdf https://doi.org/10.1051/0004-6361/202141812 |
genre |
narval narval |
genre_facet |
narval narval |
op_source |
ISSN: 0004-6361 EISSN: 1432-0756 Astronomy and Astrophysics - A&A https://hal.science/hal-03533666 Astronomy and Astrophysics - A&A, 2022, 657, pp.A107. ⟨10.1051/0004-6361/202141812⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/arxiv/2110.10633 info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/202141812 hal-03533666 https://hal.science/hal-03533666 https://hal.science/hal-03533666/document https://hal.science/hal-03533666/file/aa41812-21.pdf ARXIV: 2110.10633 doi:10.1051/0004-6361/202141812 INSPIRE: 2099806 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1051/0004-6361/202141812 |
container_title |
Astronomy & Astrophysics |
container_volume |
657 |
container_start_page |
A107 |
_version_ |
1766244621847887872 |
spelling |
ftunivnantes:oai:HAL:hal-03533666v1 2023-05-15T18:50:52+02:00 Mitigating stellar activity jitter with different line lists for least-squares deconvolution Mitigating stellar activity jitter with different line lists for least-squares deconvolution: Analysis of a parametric and a randomised line selection Bellotti, S. Petit, P. Morin, J. Hussain, G. A. J. Folsom, C. P. Carmona, A. Delfosse, X. Moutou, C. Institut de recherche en astrophysique et planétologie (IRAP) Université Toulouse III - Paul Sabatier (UT3) Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-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 Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-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) Laboratoire Univers et Particules de Montpellier (LUPM) Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM) Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) Centre National d'Études Spatiales Toulouse (CNES)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ) Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France -Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France 2022 https://hal.science/hal-03533666 https://hal.science/hal-03533666/document https://hal.science/hal-03533666/file/aa41812-21.pdf https://doi.org/10.1051/0004-6361/202141812 en eng HAL CCSD EDP Sciences info:eu-repo/semantics/altIdentifier/arxiv/2110.10633 info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/202141812 hal-03533666 https://hal.science/hal-03533666 https://hal.science/hal-03533666/document https://hal.science/hal-03533666/file/aa41812-21.pdf ARXIV: 2110.10633 doi:10.1051/0004-6361/202141812 INSPIRE: 2099806 info:eu-repo/semantics/OpenAccess ISSN: 0004-6361 EISSN: 1432-0756 Astronomy and Astrophysics - A&A https://hal.science/hal-03533666 Astronomy and Astrophysics - A&A, 2022, 657, pp.A107. ⟨10.1051/0004-6361/202141812⟩ stars: activity methods: data analysis techniques: polarimetric techniques: radial velocities [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] info:eu-repo/semantics/article Journal articles 2022 ftunivnantes https://doi.org/10.1051/0004-6361/202141812 2023-03-08T02:12:36Z International audience Context. Stellar activity limits the radial velocity (RV) search and characterisation of exoplanets, as it introduces spurious noise (called jitter) in the data sets and prevents the correct retrieval of a planetary signal. This is key for M dwarfs, considering that they manifest high activity levels and are primary targets for present and future searches of habitable Earth-like planets. To perform precise RV measurements, multi-line numerical techniques like cross-correlation and least-squares deconvolution (LSD) are typically employed.Aims. Effective filtering of activity is crucial to achieving the sensitivity required for small planet detections. Here we analyse the impact of selecting different line lists for LSD on the dispersion in our RV data sets, to identify the line list that most effectively reduces the jitter.Methods. We employ optical spectropolarimetric observations of the active M dwarf EV Lac collected with ESPaDOnS and NARVAL, and study two line down-selection approaches: a parametric method based on line properties (depth, wavelength, magnetic sensitivity) and a randomised algorithm that samples the line combination space. We test the latter further to find the line list that singles out the activity signal from other sources of noise, and on AD Leo and DS Leo to examine its consistency at mitigating jitter for different activity levels. The analysis is complemented with planetary injection tests.Results. The parametric selection yields a RV RMS reduction of less than 10%, while the randomised selection yields a systematic improvement (>50%) regardless of the activity level of the star examined. Furthermore, if activity is the dominant source of noise, this approach allows the construction of lists containing mainly activity-sensitive lines, which could be used to enhance the rotational modulation of the resulting data sets and determine the stellar rotation period more robustly. Finally, the output line lists allow the recovery of a synthetic planet (0.3–0.6 MJup ... Article in Journal/Newspaper narval narval Université de Nantes: HAL-UNIV-NANTES Astronomy & Astrophysics 657 A107 |