Detection of Gravity Modes in RR Lyrae Stars
International audience Abstract We report the detection of gravity modes in RR Lyrae stars. Thanks to Photometer AntarctIca eXtinction (PAIX), the first Antarctic polar photometer. Unprecedented and uninterrupted UBVRI time-series photometric ground-based data are collected during 150 days from the...
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Online Access: | https://hal.science/hal-03655183 https://hal.science/hal-03655183/document https://hal.science/hal-03655183/file/Chadid_2022_ApJ_925_114.pdf https://doi.org/10.3847/1538-4357/ac37c0 |
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ftinsu:oai:HAL:hal-03655183v1 2023-10-09T21:46:37+02:00 Detection of Gravity Modes in RR Lyrae Stars Chadid, Merieme Astrophysique Relativiste Théories Expériences Métrologie Instrumentation Signaux (ARTEMIS) Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS) 2022-01-31 https://hal.science/hal-03655183 https://hal.science/hal-03655183/document https://hal.science/hal-03655183/file/Chadid_2022_ApJ_925_114.pdf https://doi.org/10.3847/1538-4357/ac37c0 en eng HAL CCSD American Astronomical Society info:eu-repo/semantics/altIdentifier/arxiv/2201.04869 info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4357/ac37c0 hal-03655183 https://hal.science/hal-03655183 https://hal.science/hal-03655183/document https://hal.science/hal-03655183/file/Chadid_2022_ApJ_925_114.pdf ARXIV: 2201.04869 doi:10.3847/1538-4357/ac37c0 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0004-637X EISSN: 1538-4357 The Astrophysical Journal https://hal.science/hal-03655183 The Astrophysical Journal, 2022, 925 (2), pp.114. ⟨10.3847/1538-4357/ac37c0⟩ [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] info:eu-repo/semantics/article Journal articles 2022 ftinsu https://doi.org/10.3847/1538-4357/ac37c0 2023-09-13T16:26:30Z International audience Abstract We report the detection of gravity modes in RR Lyrae stars. Thanks to Photometer AntarctIca eXtinction (PAIX), the first Antarctic polar photometer. Unprecedented and uninterrupted UBVRI time-series photometric ground-based data are collected during 150 days from the highest plateau of Antarctica. PAIX light-curve analyses reveal an even richer power spectrum with mixed modes in RR Lyrae stars. The nonlinear nature of several dominant peaks, showing lower and higher frequencies, occurs around the dominant fundamental radial pressure mode. These lower frequencies and harmonics linearly interact with the dominant fundamental radial pressure mode and its second and third overtone pressure modes, as well. Half-integer frequencies are also detected, likewise side-peak structures, demonstrating that HH Puppis is a bona-fide Blazhko star. Fourier correlations are used to derive underlying physical characteristics for HH Puppis. The most striking finding is the direct detection of gravity waves. We interpret the excitation mechanism of gravity waves in RR Lyrae stars by the penetrative convection-driving mechanism. We demonstrate that RR Lyrae stars’ pulsation is excited by several distinct mechanisms, and hence RR Lyrae stars are simultaneously g- mode and p- mode pulsators. Our discoveries make RR Lyrae stars very challenging stellar objects, and provide their potential to undergo at the same time g and p modes toward an advancement of the theory of stellar evolution and a better understanding of the universe. Article in Journal/Newspaper Antarc* Antarctic Antarctica Institut national des sciences de l'Univers: HAL-INSU Antarctic The Astrophysical Journal 925 2 114 |
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Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] |
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[PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] Chadid, Merieme Detection of Gravity Modes in RR Lyrae Stars |
topic_facet |
[PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] |
description |
International audience Abstract We report the detection of gravity modes in RR Lyrae stars. Thanks to Photometer AntarctIca eXtinction (PAIX), the first Antarctic polar photometer. Unprecedented and uninterrupted UBVRI time-series photometric ground-based data are collected during 150 days from the highest plateau of Antarctica. PAIX light-curve analyses reveal an even richer power spectrum with mixed modes in RR Lyrae stars. The nonlinear nature of several dominant peaks, showing lower and higher frequencies, occurs around the dominant fundamental radial pressure mode. These lower frequencies and harmonics linearly interact with the dominant fundamental radial pressure mode and its second and third overtone pressure modes, as well. Half-integer frequencies are also detected, likewise side-peak structures, demonstrating that HH Puppis is a bona-fide Blazhko star. Fourier correlations are used to derive underlying physical characteristics for HH Puppis. The most striking finding is the direct detection of gravity waves. We interpret the excitation mechanism of gravity waves in RR Lyrae stars by the penetrative convection-driving mechanism. We demonstrate that RR Lyrae stars’ pulsation is excited by several distinct mechanisms, and hence RR Lyrae stars are simultaneously g- mode and p- mode pulsators. Our discoveries make RR Lyrae stars very challenging stellar objects, and provide their potential to undergo at the same time g and p modes toward an advancement of the theory of stellar evolution and a better understanding of the universe. |
author2 |
Astrophysique Relativiste Théories Expériences Métrologie Instrumentation Signaux (ARTEMIS) Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Chadid, Merieme |
author_facet |
Chadid, Merieme |
author_sort |
Chadid, Merieme |
title |
Detection of Gravity Modes in RR Lyrae Stars |
title_short |
Detection of Gravity Modes in RR Lyrae Stars |
title_full |
Detection of Gravity Modes in RR Lyrae Stars |
title_fullStr |
Detection of Gravity Modes in RR Lyrae Stars |
title_full_unstemmed |
Detection of Gravity Modes in RR Lyrae Stars |
title_sort |
detection of gravity modes in rr lyrae stars |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-03655183 https://hal.science/hal-03655183/document https://hal.science/hal-03655183/file/Chadid_2022_ApJ_925_114.pdf https://doi.org/10.3847/1538-4357/ac37c0 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
ISSN: 0004-637X EISSN: 1538-4357 The Astrophysical Journal https://hal.science/hal-03655183 The Astrophysical Journal, 2022, 925 (2), pp.114. ⟨10.3847/1538-4357/ac37c0⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/arxiv/2201.04869 info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4357/ac37c0 hal-03655183 https://hal.science/hal-03655183 https://hal.science/hal-03655183/document https://hal.science/hal-03655183/file/Chadid_2022_ApJ_925_114.pdf ARXIV: 2201.04869 doi:10.3847/1538-4357/ac37c0 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3847/1538-4357/ac37c0 |
container_title |
The Astrophysical Journal |
container_volume |
925 |
container_issue |
2 |
container_start_page |
114 |
_version_ |
1779322349873528832 |