Thorium in solar twins : implications for habitability in rocky planets
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/194692 |
Resumo: | We have investigated the thorium (Th) abundance in a sample of 53 thin disc solar twins covering a wide range of ages. These data provide constrains on the mantle energy budget of terrestrial planets that can be formed over the evolution of the Galaxy’s thin disc. We have estimated Th abundances with an average precision of 0.025 dex (in both [Th/H] and [Th/Fe]) through comprehensive spectral synthesis of a Th II line present at 4019.1290 Å, using very high resolution (R = 115 000) high quality HARPS spectra obtained at the ESO La Silla Observatory. We have confirmed that there is a large energy budget from Th decay for maintaining mantle convection inside potential rocky planets around solar twins, from the Galactic thin disc formation until now, because the pristine [Th/H]ZAMS is super-solar on average under a uniform dispersion of 0.056 dex (varying from+0.037 up to+0.138 dex based on linear fits against isochrone stellar age). Comparing to neodymium (Nd) and europium (Eu), two others neutron-capture elements, the stellar pristine abundance of Th follows Eu along the Galactic thin disc evolution, but it does not follow Nd, probably because neodymium has a significant contribution from the s-process (about 60 per cent). |
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Botelho, Rafael BuenoMilone, André de CastroMeléndez, JorgeBedell, MeganSpina, LorenzoAsplund, MartinSantos, Leonardo Augusto Gonçalves dosBean, Jacob L.Ramírez, IvánYong, DavidDreizler, StefanAlves-Brito, AlanGalarza, Jhon Joel Yana2019-05-29T02:43:15Z20190035-8711http://hdl.handle.net/10183/194692001090016We have investigated the thorium (Th) abundance in a sample of 53 thin disc solar twins covering a wide range of ages. These data provide constrains on the mantle energy budget of terrestrial planets that can be formed over the evolution of the Galaxy’s thin disc. We have estimated Th abundances with an average precision of 0.025 dex (in both [Th/H] and [Th/Fe]) through comprehensive spectral synthesis of a Th II line present at 4019.1290 Å, using very high resolution (R = 115 000) high quality HARPS spectra obtained at the ESO La Silla Observatory. We have confirmed that there is a large energy budget from Th decay for maintaining mantle convection inside potential rocky planets around solar twins, from the Galactic thin disc formation until now, because the pristine [Th/H]ZAMS is super-solar on average under a uniform dispersion of 0.056 dex (varying from+0.037 up to+0.138 dex based on linear fits against isochrone stellar age). Comparing to neodymium (Nd) and europium (Eu), two others neutron-capture elements, the stellar pristine abundance of Th follows Eu along the Galactic thin disc evolution, but it does not follow Nd, probably because neodymium has a significant contribution from the s-process (about 60 per cent).application/pdfengMonthly notices of the royal astronomical society. Oxford. Vol. 482, no. 2 (Jan. 2019), p. 1690–1700TórioComposicao estelarPlanetas extrasolaresStars: abundancesStars: fundamental parametersStars: solar-typeGalaxy: discSolar neighbourhood; planets and satellites: terrestrial planetsThorium in solar twins : implications for habitability in rocky planetsEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001090016.pdf.txt001090016.pdf.txtExtracted Texttext/plain51774http://www.lume.ufrgs.br/bitstream/10183/194692/2/001090016.pdf.txtf775aa22224567c04c1b031a712471a6MD52ORIGINAL001090016.pdfTexto completo (inglês)application/pdf1004062http://www.lume.ufrgs.br/bitstream/10183/194692/1/001090016.pdf4e5ed1ec9f26ea71eb83c3c4d6d47a16MD5110183/1946922023-05-14 03:23:42.480062oai:www.lume.ufrgs.br:10183/194692Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-05-14T06:23:42Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Thorium in solar twins : implications for habitability in rocky planets |
title |
Thorium in solar twins : implications for habitability in rocky planets |
spellingShingle |
Thorium in solar twins : implications for habitability in rocky planets Botelho, Rafael Bueno Tório Composicao estelar Planetas extrasolares Stars: abundances Stars: fundamental parameters Stars: solar-type Galaxy: disc Solar neighbourhood; planets and satellites: terrestrial planets |
title_short |
Thorium in solar twins : implications for habitability in rocky planets |
title_full |
Thorium in solar twins : implications for habitability in rocky planets |
title_fullStr |
Thorium in solar twins : implications for habitability in rocky planets |
title_full_unstemmed |
Thorium in solar twins : implications for habitability in rocky planets |
title_sort |
Thorium in solar twins : implications for habitability in rocky planets |
author |
Botelho, Rafael Bueno |
author_facet |
Botelho, Rafael Bueno Milone, André de Castro Meléndez, Jorge Bedell, Megan Spina, Lorenzo Asplund, Martin Santos, Leonardo Augusto Gonçalves dos Bean, Jacob L. Ramírez, Iván Yong, David Dreizler, Stefan Alves-Brito, Alan Galarza, Jhon Joel Yana |
author_role |
author |
author2 |
Milone, André de Castro Meléndez, Jorge Bedell, Megan Spina, Lorenzo Asplund, Martin Santos, Leonardo Augusto Gonçalves dos Bean, Jacob L. Ramírez, Iván Yong, David Dreizler, Stefan Alves-Brito, Alan Galarza, Jhon Joel Yana |
author2_role |
author author author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Botelho, Rafael Bueno Milone, André de Castro Meléndez, Jorge Bedell, Megan Spina, Lorenzo Asplund, Martin Santos, Leonardo Augusto Gonçalves dos Bean, Jacob L. Ramírez, Iván Yong, David Dreizler, Stefan Alves-Brito, Alan Galarza, Jhon Joel Yana |
dc.subject.por.fl_str_mv |
Tório Composicao estelar Planetas extrasolares |
topic |
Tório Composicao estelar Planetas extrasolares Stars: abundances Stars: fundamental parameters Stars: solar-type Galaxy: disc Solar neighbourhood; planets and satellites: terrestrial planets |
dc.subject.eng.fl_str_mv |
Stars: abundances Stars: fundamental parameters Stars: solar-type Galaxy: disc Solar neighbourhood; planets and satellites: terrestrial planets |
description |
We have investigated the thorium (Th) abundance in a sample of 53 thin disc solar twins covering a wide range of ages. These data provide constrains on the mantle energy budget of terrestrial planets that can be formed over the evolution of the Galaxy’s thin disc. We have estimated Th abundances with an average precision of 0.025 dex (in both [Th/H] and [Th/Fe]) through comprehensive spectral synthesis of a Th II line present at 4019.1290 Å, using very high resolution (R = 115 000) high quality HARPS spectra obtained at the ESO La Silla Observatory. We have confirmed that there is a large energy budget from Th decay for maintaining mantle convection inside potential rocky planets around solar twins, from the Galactic thin disc formation until now, because the pristine [Th/H]ZAMS is super-solar on average under a uniform dispersion of 0.056 dex (varying from+0.037 up to+0.138 dex based on linear fits against isochrone stellar age). Comparing to neodymium (Nd) and europium (Eu), two others neutron-capture elements, the stellar pristine abundance of Th follows Eu along the Galactic thin disc evolution, but it does not follow Nd, probably because neodymium has a significant contribution from the s-process (about 60 per cent). |
publishDate |
2019 |
dc.date.accessioned.fl_str_mv |
2019-05-29T02:43:15Z |
dc.date.issued.fl_str_mv |
2019 |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
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article |
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publishedVersion |
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http://hdl.handle.net/10183/194692 |
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0035-8711 |
dc.identifier.nrb.pt_BR.fl_str_mv |
001090016 |
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0035-8711 001090016 |
url |
http://hdl.handle.net/10183/194692 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Monthly notices of the royal astronomical society. Oxford. Vol. 482, no. 2 (Jan. 2019), p. 1690–1700 |
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info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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application/pdf |
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