Novo cronômetro estelar a partir da análise de curvas de luz TESS de estrelas gêmeas solares
Autor(a) principal: | |
---|---|
Data de Publicação: | 2020 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Biblioteca Digital de Teses e Dissertações do Mackenzie |
Texto Completo: | https://dspace.mackenzie.br/handle/10899/28426 |
Resumo: | The variability seen in the brightness of stars on timescale of days is often attributed to the crossing of dark spots on the surface as the star rotates. Stellar activity, known to be associated with the occurrence of spots, depends on the age of the star. Younger stars tend to be much more active and this activity decreases as the stars age. To explore a possible new stellar age indicator, we analyzed the photometric variability of 30 solar twins using 2min cadence light curves of the TESS/NASA space mission. This valuable dataset may help to understand the implications of the variability of magnetic activity in exoplanet research and the concept of habitability. For that, we built a photometric amplitude index ATESS directly correlated with the average index of chromospheric activity logR0 HK, analyzed via precise atmospheric parameters derived from HARPS/ESO spectra. These relations use the rotational modulation observed in TESS light curves due to active regions on the stellar surfaces, consisting of stellar spots and faculae, as a function of activity levels. We built a new tool in Python that optimizes the removal of TESS instrumental systematics, maximizing the analysis of the amplitude of the photometric variability due to the passage of active regions on the star surface. We also analyzed the Sun using 22 years of TSI observations by VIRGO/SOHO. Our results show that the photometric amplitudes are strongly correlated with the levels of chromospheric activity of the solar twin stars in our sample, showing a very clear relationship also with their ages. We demonstrate that the Sun is an ordinary star within this scenario, presenting a behavior as expected due to its activity level and well-established age. This result is in agreement with the literature which established a very robust relationship between age and activity of solar twins. Finally, we understand that the ATESS can be used as an index of chromospheric activity, as well as a stellar chronometer for solar twin stars observed by TESS. |
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2021-12-13T18:22:42Z2021-12-13T18:22:42Z2020-10-27PONTE, Geisa Teixeira da. Novo cronômetro estelar a partir da análise de curvas de luz TESS de estrelas gêmeas solares. 2020.71 f.. Dissertação( Ciências e Aplicações Geoespaciais) - Universidade Presbiteriana Mackenzie,São Paulo.https://dspace.mackenzie.br/handle/10899/28426The variability seen in the brightness of stars on timescale of days is often attributed to the crossing of dark spots on the surface as the star rotates. Stellar activity, known to be associated with the occurrence of spots, depends on the age of the star. Younger stars tend to be much more active and this activity decreases as the stars age. To explore a possible new stellar age indicator, we analyzed the photometric variability of 30 solar twins using 2min cadence light curves of the TESS/NASA space mission. This valuable dataset may help to understand the implications of the variability of magnetic activity in exoplanet research and the concept of habitability. For that, we built a photometric amplitude index ATESS directly correlated with the average index of chromospheric activity logR0 HK, analyzed via precise atmospheric parameters derived from HARPS/ESO spectra. These relations use the rotational modulation observed in TESS light curves due to active regions on the stellar surfaces, consisting of stellar spots and faculae, as a function of activity levels. We built a new tool in Python that optimizes the removal of TESS instrumental systematics, maximizing the analysis of the amplitude of the photometric variability due to the passage of active regions on the star surface. We also analyzed the Sun using 22 years of TSI observations by VIRGO/SOHO. Our results show that the photometric amplitudes are strongly correlated with the levels of chromospheric activity of the solar twin stars in our sample, showing a very clear relationship also with their ages. We demonstrate that the Sun is an ordinary star within this scenario, presenting a behavior as expected due to its activity level and well-established age. This result is in agreement with the literature which established a very robust relationship between age and activity of solar twins. Finally, we understand that the ATESS can be used as an index of chromospheric activity, as well as a stellar chronometer for solar twin stars observed by TESS.Algumas estrelas apresentam variabilidade em seu brilho em escalas de tempo de dias, que pode ocorrer devido à passagem de manchas escuras em sua superfície conforme a estrela rotaciona. Sabe-se que a atividade estelar está associada à ocorrência de manchas e depende da idade da estrela. Estrelas mais jovens costumam ser bem mais ativas e esta atividade diminui à medida que sua idade aumenta. A fim de explorar um possível novo indicador de idade estelar, analisamos a variabilidade fotométrica de 30 gêmeas solares usando curvas de luz de 2min de cadência da missão espacial TESS/NASA. Para tanto, construímos um índice de amplitude da variabilidade fotométrica ATESS diretamente correlacionado com o índice médio de atividade cromosférica logR0 HK, analisados via parâmetros atmosféricos precisos derivados de espectros HARPS/ESO. Essas relações usam a modulação rotacional em curvas de luz da TESS devido à presença de manchas estelares e fáculas na superfície estelar que varia em função dos níveis de atividade da estrela. Construímos uma nova ferramenta em Python que otimiza a remoção de sistemáticas instrumentais da TESS, maximizando a obtenção da amplitude da variabilidade fotométrica devido a passagens de regiões ativas na superfície estelar. Também fizemos a análise para o Sol, utilizando 22 anos de observações da TSI pelo VIRGO/SOHO. Nossos resultados mostram que as amplitudes fotométricas estão fortemente correlacionadas com os níveis de atividade cromosférica das estrelas gêmeas solares da nossa amostra, exibindo uma relação bastante clara também com suas idades. Ainda, mostramos que o Sol é uma estrela bastante comum dentro deste cenário, apresentando um comportamento dentro do esperado pelo seu nível de atividade e idade bem estabelecida. Esse resultado está de acordo com a literatura que estabelece uma relação bastante robusta entre idade e atividade de gêmeas solares. O resultado deste valioso conjunto de dados poderá ajudar a entender as implicações da variabilidade da atividade magnética em pesquisas sobre exoplanetas e o conceito de habitabilidade. Por fim, entendemos que a ATESS pode ser utilizada como índice de atividade cromosférica, além de um cronômetro estelar para estrelas gêmeas solares observadas pela TESS.Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorFundação de Amparo a Pesquisa do Estado de São PauloFundo Mackenzie de Pesquisaapplication/pdfporUniversidade Presbiteriana MackenzieCiências e Aplicações GeoespaciaisUPMBrasilEscola de Engenharia Mackenzie (EE)http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessestrelasatividadetipo solartécnicasfotometriaCNPQ::ENGENHARIAS::ENGENHARIA AEROESPACIALNovo cronômetro estelar a partir da análise de curvas de luz TESS de estrelas gêmeas solaresinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisValio, Adriana Benetti Marqueshttp://lattes.cnpq.br/1041565102315246Moreno, Jorge Luis Meléndezhttp://lattes.cnpq.br/1479508192871529Simões, Paulo José Aguiarhttp://lattes.cnpq.br/9281522944369099http://lattes.cnpq.br/2007217451703689Ponte, Geisa Teixeira dastarsactivitysolar typetechniquesphotometricreponame:Biblioteca Digital de Teses e Dissertações do Mackenzieinstname:Universidade Presbiteriana Mackenzie (MACKENZIE)instacron:MACKENZIEORIGINALBDTD - 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dc.title.por.fl_str_mv |
Novo cronômetro estelar a partir da análise de curvas de luz TESS de estrelas gêmeas solares |
title |
Novo cronômetro estelar a partir da análise de curvas de luz TESS de estrelas gêmeas solares |
spellingShingle |
Novo cronômetro estelar a partir da análise de curvas de luz TESS de estrelas gêmeas solares Ponte, Geisa Teixeira da estrelas atividade tipo solar técnicas fotometria CNPQ::ENGENHARIAS::ENGENHARIA AEROESPACIAL |
title_short |
Novo cronômetro estelar a partir da análise de curvas de luz TESS de estrelas gêmeas solares |
title_full |
Novo cronômetro estelar a partir da análise de curvas de luz TESS de estrelas gêmeas solares |
title_fullStr |
Novo cronômetro estelar a partir da análise de curvas de luz TESS de estrelas gêmeas solares |
title_full_unstemmed |
Novo cronômetro estelar a partir da análise de curvas de luz TESS de estrelas gêmeas solares |
title_sort |
Novo cronômetro estelar a partir da análise de curvas de luz TESS de estrelas gêmeas solares |
author |
Ponte, Geisa Teixeira da |
author_facet |
Ponte, Geisa Teixeira da |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Valio, Adriana Benetti Marques |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/1041565102315246 |
dc.contributor.referee1.fl_str_mv |
Moreno, Jorge Luis Meléndez |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/1479508192871529 |
dc.contributor.referee2.fl_str_mv |
Simões, Paulo José Aguiar |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/9281522944369099 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/2007217451703689 |
dc.contributor.author.fl_str_mv |
Ponte, Geisa Teixeira da |
contributor_str_mv |
Valio, Adriana Benetti Marques Moreno, Jorge Luis Meléndez Simões, Paulo José Aguiar |
dc.subject.por.fl_str_mv |
estrelas atividade tipo solar técnicas fotometria |
topic |
estrelas atividade tipo solar técnicas fotometria CNPQ::ENGENHARIAS::ENGENHARIA AEROESPACIAL |
dc.subject.cnpq.fl_str_mv |
CNPQ::ENGENHARIAS::ENGENHARIA AEROESPACIAL |
description |
The variability seen in the brightness of stars on timescale of days is often attributed to the crossing of dark spots on the surface as the star rotates. Stellar activity, known to be associated with the occurrence of spots, depends on the age of the star. Younger stars tend to be much more active and this activity decreases as the stars age. To explore a possible new stellar age indicator, we analyzed the photometric variability of 30 solar twins using 2min cadence light curves of the TESS/NASA space mission. This valuable dataset may help to understand the implications of the variability of magnetic activity in exoplanet research and the concept of habitability. For that, we built a photometric amplitude index ATESS directly correlated with the average index of chromospheric activity logR0 HK, analyzed via precise atmospheric parameters derived from HARPS/ESO spectra. These relations use the rotational modulation observed in TESS light curves due to active regions on the stellar surfaces, consisting of stellar spots and faculae, as a function of activity levels. We built a new tool in Python that optimizes the removal of TESS instrumental systematics, maximizing the analysis of the amplitude of the photometric variability due to the passage of active regions on the star surface. We also analyzed the Sun using 22 years of TSI observations by VIRGO/SOHO. Our results show that the photometric amplitudes are strongly correlated with the levels of chromospheric activity of the solar twin stars in our sample, showing a very clear relationship also with their ages. We demonstrate that the Sun is an ordinary star within this scenario, presenting a behavior as expected due to its activity level and well-established age. This result is in agreement with the literature which established a very robust relationship between age and activity of solar twins. Finally, we understand that the ATESS can be used as an index of chromospheric activity, as well as a stellar chronometer for solar twin stars observed by TESS. |
publishDate |
2020 |
dc.date.issued.fl_str_mv |
2020-10-27 |
dc.date.accessioned.fl_str_mv |
2021-12-13T18:22:42Z |
dc.date.available.fl_str_mv |
2021-12-13T18:22:42Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/masterThesis |
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masterThesis |
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dc.identifier.citation.fl_str_mv |
PONTE, Geisa Teixeira da. Novo cronômetro estelar a partir da análise de curvas de luz TESS de estrelas gêmeas solares. 2020.71 f.. Dissertação( Ciências e Aplicações Geoespaciais) - Universidade Presbiteriana Mackenzie,São Paulo. |
dc.identifier.uri.fl_str_mv |
https://dspace.mackenzie.br/handle/10899/28426 |
identifier_str_mv |
PONTE, Geisa Teixeira da. Novo cronômetro estelar a partir da análise de curvas de luz TESS de estrelas gêmeas solares. 2020.71 f.. Dissertação( Ciências e Aplicações Geoespaciais) - Universidade Presbiteriana Mackenzie,São Paulo. |
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https://dspace.mackenzie.br/handle/10899/28426 |
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por |
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por |
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http://creativecommons.org/licenses/by-nc-nd/4.0/ |
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openAccess |
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Universidade Presbiteriana Mackenzie |
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Ciências e Aplicações Geoespaciais |
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UPM |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Escola de Engenharia Mackenzie (EE) |
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Universidade Presbiteriana Mackenzie |
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