Imaging and astrometry for the coolest brown dwarfs

The discovery of brown dwarfs of the new Y spectral type by the NASA Wide-field Infrared Survey Explorer (WISE) has allowed astronomers to study the physics of the coolest brown dwarfs and determine their prevalence in the Milky Way. This thesis exploits the high resolution and wide field–of–view of...

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Detalhes bibliográficos
Autor: Opitz, Daniela
Tipo de documento: tese
Estado:Versão publicada
Data de publicação:2018
País:Chile
OAI Identifier:oai:repositorio.anid.cl:10533/232831
Acesso em linha:https://hdl.handle.net/10533/232831
Access Level:Acceso aberto
Palavra-chave:Ciencias Naturales
Ciencias Físicas
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dc.title.es_CL.fl_str_mv Imaging and astrometry for the coolest brown dwarfs
dc.title.none.fl_str_mv Imaging and astrometry for the coolest brown dwarfs
title Imaging and astrometry for the coolest brown dwarfs
spellingShingle Imaging and astrometry for the coolest brown dwarfs
Opitz, Daniela
Ciencias Naturales
Ciencias Físicas
title_short Imaging and astrometry for the coolest brown dwarfs
title_full Imaging and astrometry for the coolest brown dwarfs
title_fullStr Imaging and astrometry for the coolest brown dwarfs
title_full_unstemmed Imaging and astrometry for the coolest brown dwarfs
title_sort Imaging and astrometry for the coolest brown dwarfs
dc.creator.none.fl_str_mv Opitz, Daniela
author Opitz, Daniela
author_facet Opitz, Daniela
author_role author
dc.contributor.advisor.none.fl_str_mv Tinney, Christopher
dc.contributor.institution.es_CL.fl_str_mv UNIVERSITY OF NEW SOUTH WALES
dc.subject.oecd1n.es_CL.fl_str_mv Ciencias Naturales
topic Ciencias Naturales
Ciencias Físicas
dc.subject.oecd2n.es_CL.fl_str_mv Ciencias Físicas
description The discovery of brown dwarfs of the new Y spectral type by the NASA Wide-field Infrared Survey Explorer (WISE) has allowed astronomers to study the physics of the coolest brown dwarfs and determine their prevalence in the Milky Way. This thesis exploits the high resolution and wide field–of–view of Gemini Multi–Conjugate Adaptive Optics System (GeMS) to perform diffraction-limited imaging to explore the binary properties of a sample of five WISE Y-dwarfs and measure astrometric distances. Regarding binarity, I report no evidence for binary companions in these data, which suggests these systems are not equal–luminosity (or equal–mass) binaries with separations larger than 0.5–1.9 AU. For equal-mass binaries at an age of 5 Gyr, we find that the binary binding energies ruled out by our observations (i.e. 10^11 erg) are consistent with those observed in previous studies of hotter ultra-cool dwarfs. Regarding GeMS astrometric performance, I report the first parallaxes and proper motion measurements for the Y0 dwarf WISEA J071322.55–291752.0 and the Y1 dwarf WISEP J154151.65–225025.2 measured with a Multi–Conjugate Adaptive Optics System (MCAO). Parallaxes measurements for both objects are consistent with those delivered in previous studies while proper motion precisions are at least comparable (~ 4.2 mas) with that delivered from the no-adaptive optics camera FourStar, installed in Magellan. Imaging and astrometric results presented in this thesis demonstrate the potential of GeMS to perform high–resolution and high–precision astrometric studies for sparse fields, and conclude that the high astrometric potential can be best exploited by targeting crowded fields.
publishDate 2018
dc.date.accessioned.none.fl_str_mv 2018-12-16T20:49:11Z
2022-08-23T12:51:32Z
dc.date.available.none.fl_str_mv 2018-12-16T20:49:11Z
2022-08-23T12:51:32Z
dc.date.issued.es_CL.fl_str_mv 2018
dc.type.none.fl_str_mv Tesis Doctorado
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spelling UNIVERSITY OF NEW SOUTH WALESOpitz, Daniela2018https://hdl.handle.net/10533/232831http://purl.org/coar/access_right/c_abf2Ciencias FísicasCiencias NaturalesImaging and astrometry for the coolest brown dwarfsTinney, ChristopherUNIVERSITY OF NEW SOUTH WALESAustraliaOpitz, Daniela2018-12-16T20:49:11Z2022-08-23T12:51:32Z2018-12-16T20:49:11Z2022-08-23T12:51:32Z2018The discovery of brown dwarfs of the new Y spectral type by the NASA Wide-field Infrared Survey Explorer (WISE) has allowed astronomers to study the physics of the coolest brown dwarfs and determine their prevalence in the Milky Way. This thesis exploits the high resolution and wide field–of–view of Gemini Multi–Conjugate Adaptive Optics System (GeMS) to perform diffraction-limited imaging to explore the binary properties of a sample of five WISE Y-dwarfs and measure astrometric distances. Regarding binarity, I report no evidence for binary companions in these data, which suggests these systems are not equal–luminosity (or equal–mass) binaries with separations larger than 0.5–1.9 AU. For equal-mass binaries at an age of 5 Gyr, we find that the binary binding energies ruled out by our observations (i.e. 10^11 erg) are consistent with those observed in previous studies of hotter ultra-cool dwarfs. Regarding GeMS astrometric performance, I report the first parallaxes and proper motion measurements for the Y0 dwarf WISEA J071322.55–291752.0 and the Y1 dwarf WISEP J154151.65–225025.2 measured with a Multi–Conjugate Adaptive Optics System (MCAO). Parallaxes measurements for both objects are consistent with those delivered in previous studies while proper motion precisions are at least comparable (~ 4.2 mas) with that delivered from the no-adaptive optics camera FourStar, installed in Magellan. Imaging and astrometric results presented in this thesis demonstrate the potential of GeMS to perform high–resolution and high–precision astrometric studies for sparse fields, and conclude that the high astrometric potential can be best exploited by targeting crowded fields.PFCHA-BecasPFCHA-Becas72130434https://hdl.handle.net/10533/232831instname: Conicytreponame: Repositorio Digital RI2.0info:eu-repo/grantAgreement//72130434info:eu-repo/semantics/dataset/hdl.handle.net/10533/93488https://www.unsworks.unsw.edu.au/primo-explore/fulldisplay?vid=UNSWORKS&docid=unsworks_51867&context=Linfo:eu-repo/semantics/openAccessCC0 1.0 Universalhttp://creativecommons.org/publicdomain/zero/1.0/Ciencias NaturalesCiencias FísicasImaging and astrometry for the coolest brown dwarfsImaging and astrometry for the coolest brown dwarfsTesis Doctoradoinfo:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/publishedVersionTesisTesishttps://hdl.handle.net/10533/232831PFCHA-Becasfc20145a-1f1a-42fc-bde7-8aaeb1ecaf41virtual::60826-1fc20145a-1f1a-42fc-bde7-8aaeb1ecaf41virtual::60826-1ORIGINALz3421862_Thesis_Public_Version.pdfMain articleapplication/pdf13746035https://repositorio.anid.cl/bitstreams/cd66e1ae-115f-4157-984e-d6bc937c8b3c/download0e545f18cc5c3d243c0a679c88f249a5MD51CC-LICENSElicense_rdfapplication/octet-stream1089https://repositorio.anid.cl/bitstreams/299e9be6-a526-447b-a2b1-4951c5aaf002/download0a703d871bf062c5fdc7850b1496693bMD52LICENSElicense.txttext/plain1779https://repositorio.anid.cl/bitstreams/00416ed2-c056-44f4-a531-3622b8e7d36d/download593a6e7305c66c56041a9f9e15a649c1MD53TEXTz3421862_Thesis_Public_Version.pdf.txtExtracted texttext/plain228770https://repositorio.anid.cl/bitstreams/416476aa-dfe6-4d72-ac24-65cdd60a947d/downloadc0b6afc92778d6de7a1777606dd22702MD54THUMBNAILz3421862_Thesis_Public_Version.pdf.jpgIM Thumbnailimage/jpeg2181https://repositorio.anid.cl/bitstreams/b7ac70a6-ecc8-42d9-84ce-ddd3a4ba29c4/downloadf51b6a337b967f2b791c91fbbcc65d4dMD5510533/232831oai:repositorio.anid.cl:10533/2328312023-07-24 11:24:58.795http://creativecommons.org/publicdomain/zero/1.0/info:eu-repo/semantics/openAccesshttps://repositorio.anid.clRepositorio ANIDaletelier@anid.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