The Size, Shape, Albedo, Density, and Atmospheric Limit of Transneptunian Object (50000) Quaoar from Multi-chord Stellar Occultations

Autores
Braga Ribas, F.; Sicardy, B.; Ortiz, J. L.; Lellouch, E.; Tancredi, G.; Lecacheux, J.; Vieira Martins, R.; Camargo, J. I. B.; Assafin, M.; Behrend, R.; Vachier, F.; Colas, F.; Morales, N.; Maury, A.; Emilio, M.; Amorim, A.; Unda Sanzana, E.; Roland, S.; Bruzzone, S.; Almeida, L. A.; Rodrigues, C. V.; Jacques, C.; Gil Hutton, Ricardo Alfredo; Vanzi, L.; Milone, A. C.; Schoenell, W.; Salvo, R.; Almenares, L.; Jehin, E; Manfroid, J.; Sposetti, S.; Tanga, P.; Klotz, A.; Frappa, E.; Cacella, P.; Colque, J. P.; Neves, C.; Alvarez, E. M.; Gillon, M.; Pimentel, E.; Giacchini, B.; Roques, F.; Widemann, T.; Magalhães, V. S.; Thirouin, A.; Duffard, Rene Damian; Leiva, R.; Toledo, I.; Capeche, J.; Beisker, W.; Pollock, J.; Cedeno Montaña, C. E.; Ivarsen, K; Reichart, D.; Haislip, J.; Lacluyze, A.
Año de publicación
2013
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We present results derived from the first multi-chord stellar occultations by the transneptunian object (50000) Quaoar, observed on 2011 May 4 and 2012 February 17, and from a single-chord occultation observed on 2012 October 15. If the timing of the five chords obtained in 2011 were correct, then Quaoar would possess topographic features (crater or mountain) that would be too large for a body of this mass. An alternative model consists in applying time shifts to some chords to account for possible timing errors. Satisfactory elliptical fits to the chords are then possible, yielding an equivalent radius Requiv = 555±2.5 km and geometric visual albedo pV = 0.109±0.007. Assuming that Quaoar is a Maclaurin spheroid with an indeterminate polar aspect angle, we derive a true oblateness of = 0.087+0.0268 −0.0175, an equatorial radius of 569+24 −17 km, and a density of 1.99 ± 0.46 g cm−3. The orientation of our preferred solution in the plane of the sky implies that Quaoar’s satellite Weywot cannot have an equatorial orbit. Finally, we detect no global atmosphere around Quaoar, considering a pressure upper limit of about 20 nbar for a pure methane atmosphere.
Fil: Braga Ribas, F.. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil; . Laboratoire d;
Fil: Sicardy, B.. Laboratoire d; . Universite Pierre Et Marie Curie; Francia;
Fil: Ortiz, J. L.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España;
Fil: Lellouch, E.. Laboratoire d;
Fil: Tancredi, G.. Observatorio Astronomico Los Molinos; Uruguay;
Fil: Lecacheux, J.. Laboratoire d;
Fil: Vieira Martins, R.. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil; . L; . Universidade Federal Rural do Rio de Janeiro. Observatorio do Valongo; Brasil;
Fil: Camargo, J. I. B.. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil;
Fil: Assafin, M.. Universidade Federal Rural do Rio de Janeiro. Observatorio do Valongo; Brasil;
Fil: Behrend, R.. Observatoire de Geneve; Suiza;
Fil: Vachier, F.. L;
Fil: Colas, F.. L;
Fil: Morales, N.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España;
Fil: Maury, A.. San Pedro de Atacama Celestial Explorations, Chile;
Fil: Emilio, M.. Universidad Stadual de Ponta Grossa; Brasil;
Fil: Amorim, A.. Universidade Federal Da Santa Catarina; Brasil;
Fil: Unda Sanzana, E.. Universidad de Antofagasta. Unidad de Astronomía; Chile;
Fil: Roland, S.. Observatorio Astronomico Los Molinos; Uruguay;
Fil: Bruzzone, S.. Observatorio Astronomico Los Molinos; Uruguay;
Fil: Almeida, L. A.. Centro de Previsao de Tempo e Estudos Climaticos. Instituto Nacional de Pesquisas Espaciais; Brasil;
Fil: Rodrigues, C. V.. Centro de Previsao de Tempo e Estudos Climaticos. Instituto Nacional de Pesquisas Espaciais; Brasil;
Fil: Jacques, C.. Centro de Estudos Astronomicos de Minas Gerais; Brasil;
Fil: Gil Hutton, Ricardo Alfredo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - CONICET - San Juan. Complejo Astronómico; Argentina
Fil: Vanzi, L.. Pontificia Universidad Católica de Chile. Department of Electrical Engineering and Center of Astro-Engineering; Chile;
Fil: Milone, A. C.. Centro de Previsao de Tempo e Estudos Climaticos. Instituto Nacional de Pesquisas Espaciais; Brasil;
Fil: Schoenell, W.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España; . Universidade Federal Da Santa Catarina; Brasil;
Fil: Salvo, R.. Observatorio Astronomico Los Molinos; Uruguay;
Fil: Almenares, L.. Observatorio Astronomico Los Molinos; Uruguay;
Fil: Jehin, E. Université de Liège. Institut d’Astrophysique; Belgica;
Fil: Manfroid, J.. Université de Liège. Institut d’Astrophysique; Belgica;
Fil: Sposetti, S.. Gnosca Observatory, Suiza;
Fil: Tanga, P.. Observatoire de la Cote D; . Universite de Sophia Antipolis. Laboratoire Lagrange; Francia;
Fil: Klotz, A.. Université Toulouse III “Paul Sabatier”. Observatoire Midi-Pyrénées. Institut de Recherche en Astrophysique et Planétologie; Francia;
Fil: Frappa, E.. Euraster, Francia;
Fil: Cacella, P.. Rede de Astronomia Observacional; Brasil;
Fil: Colque, J. P.. Universidad de Antofagasta. Unidad de Astronomía; Chile;
Fil: Neves, C.. Universidad Stadual de Ponta Grossa; Brasil;
Fil: Alvarez, E. M.. Observatorio Los Algarrobos, Uruguay;
Fil: Gillon, M.. Université de Liège. Institut d’Astrophysique; Belgica;
Fil: Pimentel, E.. Centro de Estudos Astronomicos de Minas Gerais; Brasil;
Fil: Giacchini, B.. Centro de Estudos Astronomicos de Minas Gerais; Brasil;
Fil: Roques, F.. Laboratoire d;
Fil: Widemann, T.. Laboratoire d;
Fil: Magalhães, V. S.. Centro de Previsao de Tempo e Estudos Climaticos. Instituto Nacional de Pesquisas Espaciais; Brasil;
Fil: Thirouin, A.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España;
Fil: Duffard, Rene Damian. Centro Informático Científico de Andalucía; España; . Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España;
Fil: Leiva, R.. Pontificia Universidad Católica de Chile. Department of Electrical Engineering and Center of Astro-Engineering; Chile;
Fil: Toledo, I.. Joint Atacama Large Millimeter/submillimeter Array Observatory; Chile;
Fil: Capeche, J.. Observatorio Astronomico Los Molinos; Uruguay;
Fil: Beisker, W.. International Occultation Timing Association European Section; Alemania;
Fil: Pollock, J.. Appalachian State University. Department of Physics and Astronomy; Estados Unidos;
Fil: Cedeno Montaña, C. E.. Centro de Previsao de Tempo e Estudos Climaticos. Instituto Nacional de Pesquisas Espaciais; Brasil;
Fil: Ivarsen, K. University of North Carolina. Physics and Astronomy Department; Estados Unidos;
Fil: Reichart, D.. University of North Carolina. Physics and Astronomy Department; Estados Unidos;
Fil: Haislip, J.. University of North Carolina. Physics and Astronomy Department; Estados Unidos;
Fil: Lacluyze, A.. University of North Carolina. Physics and Astronomy Department; Estados Unidos;
Materia
Kuiper Belt Objects
Occultations
Atmospheres
Transneptunian Object
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/1641
Acceder
id CONICETDig_aaafff1db6616923be468c77b29b1e59
oai_identifier_str oai:ri.conicet.gov.ar:11336/1641
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling The Size, Shape, Albedo, Density, and Atmospheric Limit of Transneptunian Object (50000) Quaoar from Multi-chord Stellar OccultationsBraga Ribas, F.Sicardy, B.Ortiz, J. L.Lellouch, E.Tancredi, G.Lecacheux, J.Vieira Martins, R.Camargo, J. I. B.Assafin, M.Behrend, R.Vachier, F.Colas, F.Morales, N.Maury, A.Emilio, M.Amorim, A.Unda Sanzana, E.Roland, S.Bruzzone, S.Almeida, L. A.Rodrigues, C. V.Jacques, C.Gil Hutton, Ricardo AlfredoVanzi, L.Milone, A. C.Schoenell, W.Salvo, R.Almenares, L.Jehin, EManfroid, J.Sposetti, S.Tanga, P.Klotz, A.Frappa, E.Cacella, P.Colque, J. P.Neves, C.Alvarez, E. M.Gillon, M.Pimentel, E.Giacchini, B.Roques, F.Widemann, T.Magalhães, V. S.Thirouin, A.Duffard, Rene DamianLeiva, R.Toledo, I.Capeche, J.Beisker, W.Pollock, J.Cedeno Montaña, C. E.Ivarsen, KReichart, D.Haislip, J.Lacluyze, A.Kuiper Belt ObjectsOccultationsAtmospheresTransneptunian Objecthttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We present results derived from the first multi-chord stellar occultations by the transneptunian object (50000) Quaoar, observed on 2011 May 4 and 2012 February 17, and from a single-chord occultation observed on 2012 October 15. If the timing of the five chords obtained in 2011 were correct, then Quaoar would possess topographic features (crater or mountain) that would be too large for a body of this mass. An alternative model consists in applying time shifts to some chords to account for possible timing errors. Satisfactory elliptical fits to the chords are then possible, yielding an equivalent radius Requiv = 555±2.5 km and geometric visual albedo pV = 0.109±0.007. Assuming that Quaoar is a Maclaurin spheroid with an indeterminate polar aspect angle, we derive a true oblateness of = 0.087+0.0268 −0.0175, an equatorial radius of 569+24 −17 km, and a density of 1.99 ± 0.46 g cm−3. The orientation of our preferred solution in the plane of the sky implies that Quaoar’s satellite Weywot cannot have an equatorial orbit. Finally, we detect no global atmosphere around Quaoar, considering a pressure upper limit of about 20 nbar for a pure methane atmosphere.Fil: Braga Ribas, F.. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil; . Laboratoire d;Fil: Sicardy, B.. Laboratoire d; . Universite Pierre Et Marie Curie; Francia;Fil: Ortiz, J. L.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España;Fil: Lellouch, E.. Laboratoire d;Fil: Tancredi, G.. Observatorio Astronomico Los Molinos; Uruguay;Fil: Lecacheux, J.. Laboratoire d;Fil: Vieira Martins, R.. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil; . L; . Universidade Federal Rural do Rio de Janeiro. Observatorio do Valongo; Brasil;Fil: Camargo, J. I. B.. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil;Fil: Assafin, M.. Universidade Federal Rural do Rio de Janeiro. Observatorio do Valongo; Brasil;Fil: Behrend, R.. Observatoire de Geneve; Suiza;Fil: Vachier, F.. L;Fil: Colas, F.. L;Fil: Morales, N.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España;Fil: Maury, A.. San Pedro de Atacama Celestial Explorations, Chile;Fil: Emilio, M.. Universidad Stadual de Ponta Grossa; Brasil;Fil: Amorim, A.. Universidade Federal Da Santa Catarina; Brasil;Fil: Unda Sanzana, E.. Universidad de Antofagasta. Unidad de Astronomía; Chile;Fil: Roland, S.. Observatorio Astronomico Los Molinos; Uruguay;Fil: Bruzzone, S.. Observatorio Astronomico Los Molinos; Uruguay;Fil: Almeida, L. A.. Centro de Previsao de Tempo e Estudos Climaticos. Instituto Nacional de Pesquisas Espaciais; Brasil;Fil: Rodrigues, C. V.. Centro de Previsao de Tempo e Estudos Climaticos. Instituto Nacional de Pesquisas Espaciais; Brasil;Fil: Jacques, C.. Centro de Estudos Astronomicos de Minas Gerais; Brasil;Fil: Gil Hutton, Ricardo Alfredo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - CONICET - San Juan. Complejo Astronómico; ArgentinaFil: Vanzi, L.. Pontificia Universidad Católica de Chile. Department of Electrical Engineering and Center of Astro-Engineering; Chile;Fil: Milone, A. C.. Centro de Previsao de Tempo e Estudos Climaticos. Instituto Nacional de Pesquisas Espaciais; Brasil;Fil: Schoenell, W.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España; . Universidade Federal Da Santa Catarina; Brasil;Fil: Salvo, R.. Observatorio Astronomico Los Molinos; Uruguay;Fil: Almenares, L.. Observatorio Astronomico Los Molinos; Uruguay;Fil: Jehin, E. Université de Liège. Institut d’Astrophysique; Belgica;Fil: Manfroid, J.. Université de Liège. Institut d’Astrophysique; Belgica;Fil: Sposetti, S.. Gnosca Observatory, Suiza;Fil: Tanga, P.. Observatoire de la Cote D; . Universite de Sophia Antipolis. Laboratoire Lagrange; Francia;Fil: Klotz, A.. Université Toulouse III “Paul Sabatier”. Observatoire Midi-Pyrénées. Institut de Recherche en Astrophysique et Planétologie; Francia;Fil: Frappa, E.. Euraster, Francia;Fil: Cacella, P.. Rede de Astronomia Observacional; Brasil;Fil: Colque, J. P.. Universidad de Antofagasta. Unidad de Astronomía; Chile;Fil: Neves, C.. Universidad Stadual de Ponta Grossa; Brasil;Fil: Alvarez, E. M.. Observatorio Los Algarrobos, Uruguay;Fil: Gillon, M.. Université de Liège. Institut d’Astrophysique; Belgica;Fil: Pimentel, E.. Centro de Estudos Astronomicos de Minas Gerais; Brasil;Fil: Giacchini, B.. Centro de Estudos Astronomicos de Minas Gerais; Brasil;Fil: Roques, F.. Laboratoire d;Fil: Widemann, T.. Laboratoire d;Fil: Magalhães, V. S.. Centro de Previsao de Tempo e Estudos Climaticos. Instituto Nacional de Pesquisas Espaciais; Brasil;Fil: Thirouin, A.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España;Fil: Duffard, Rene Damian. Centro Informático Científico de Andalucía; España; . Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España;Fil: Leiva, R.. Pontificia Universidad Católica de Chile. Department of Electrical Engineering and Center of Astro-Engineering; Chile;Fil: Toledo, I.. Joint Atacama Large Millimeter/submillimeter Array Observatory; Chile;Fil: Capeche, J.. Observatorio Astronomico Los Molinos; Uruguay;Fil: Beisker, W.. International Occultation Timing Association European Section; Alemania;Fil: Pollock, J.. Appalachian State University. Department of Physics and Astronomy; Estados Unidos;Fil: Cedeno Montaña, C. E.. Centro de Previsao de Tempo e Estudos Climaticos. Instituto Nacional de Pesquisas Espaciais; Brasil;Fil: Ivarsen, K. University of North Carolina. Physics and Astronomy Department; Estados Unidos;Fil: Reichart, D.. University of North Carolina. Physics and Astronomy Department; Estados Unidos;Fil: Haislip, J.. University of North Carolina. Physics and Astronomy Department; Estados Unidos;Fil: Lacluyze, A.. University of North Carolina. Physics and Astronomy Department; Estados Unidos;American Astronomical Society2013-08-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/1641Braga Ribas, F.; Sicardy, B.; Ortiz, J. L.; Lellouch, E.; Tancredi, G.; et al.; The Size, Shape, Albedo, Density, and Atmospheric Limit of Transneptunian Object (50000) Quaoar from Multi-chord Stellar Occultations; American Astronomical Society; Astrophysical Journal; 773; 26; 10-8-2013; 1-130004-637Xenginfo:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/0004-637X/773/1/26/pdf/0004-637X_773_1_26.pdfinfo:eu-repo/semantics/altIdentifier/doi/10.1088/0004-637X/773/1/26info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:53:38Zoai:ri.conicet.gov.ar:11336/1641instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-22 11:53:38.769CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The Size, Shape, Albedo, Density, and Atmospheric Limit of Transneptunian Object (50000) Quaoar from Multi-chord Stellar Occultations
title The Size, Shape, Albedo, Density, and Atmospheric Limit of Transneptunian Object (50000) Quaoar from Multi-chord Stellar Occultations
spellingShingle The Size, Shape, Albedo, Density, and Atmospheric Limit of Transneptunian Object (50000) Quaoar from Multi-chord Stellar Occultations
Braga Ribas, F.
Kuiper Belt Objects
Occultations
Atmospheres
Transneptunian Object
title_short The Size, Shape, Albedo, Density, and Atmospheric Limit of Transneptunian Object (50000) Quaoar from Multi-chord Stellar Occultations
title_full The Size, Shape, Albedo, Density, and Atmospheric Limit of Transneptunian Object (50000) Quaoar from Multi-chord Stellar Occultations
title_fullStr The Size, Shape, Albedo, Density, and Atmospheric Limit of Transneptunian Object (50000) Quaoar from Multi-chord Stellar Occultations
title_full_unstemmed The Size, Shape, Albedo, Density, and Atmospheric Limit of Transneptunian Object (50000) Quaoar from Multi-chord Stellar Occultations
title_sort The Size, Shape, Albedo, Density, and Atmospheric Limit of Transneptunian Object (50000) Quaoar from Multi-chord Stellar Occultations
dc.creator.none.fl_str_mv Braga Ribas, F.
Sicardy, B.
Ortiz, J. L.
Lellouch, E.
Tancredi, G.
Lecacheux, J.
Vieira Martins, R.
Camargo, J. I. B.
Assafin, M.
Behrend, R.
Vachier, F.
Colas, F.
Morales, N.
Maury, A.
Emilio, M.
Amorim, A.
Unda Sanzana, E.
Roland, S.
Bruzzone, S.
Almeida, L. A.
Rodrigues, C. V.
Jacques, C.
Gil Hutton, Ricardo Alfredo
Vanzi, L.
Milone, A. C.
Schoenell, W.
Salvo, R.
Almenares, L.
Jehin, E
Manfroid, J.
Sposetti, S.
Tanga, P.
Klotz, A.
Frappa, E.
Cacella, P.
Colque, J. P.
Neves, C.
Alvarez, E. M.
Gillon, M.
Pimentel, E.
Giacchini, B.
Roques, F.
Widemann, T.
Magalhães, V. S.
Thirouin, A.
Duffard, Rene Damian
Leiva, R.
Toledo, I.
Capeche, J.
Beisker, W.
Pollock, J.
Cedeno Montaña, C. E.
Ivarsen, K
Reichart, D.
Haislip, J.
Lacluyze, A.
author Braga Ribas, F.
author_facet Braga Ribas, F.
Sicardy, B.
Ortiz, J. L.
Lellouch, E.
Tancredi, G.
Lecacheux, J.
Vieira Martins, R.
Camargo, J. I. B.
Assafin, M.
Behrend, R.
Vachier, F.
Colas, F.
Morales, N.
Maury, A.
Emilio, M.
Amorim, A.
Unda Sanzana, E.
Roland, S.
Bruzzone, S.
Almeida, L. A.
Rodrigues, C. V.
Jacques, C.
Gil Hutton, Ricardo Alfredo
Vanzi, L.
Milone, A. C.
Schoenell, W.
Salvo, R.
Almenares, L.
Jehin, E
Manfroid, J.
Sposetti, S.
Tanga, P.
Klotz, A.
Frappa, E.
Cacella, P.
Colque, J. P.
Neves, C.
Alvarez, E. M.
Gillon, M.
Pimentel, E.
Giacchini, B.
Roques, F.
Widemann, T.
Magalhães, V. S.
Thirouin, A.
Duffard, Rene Damian
Leiva, R.
Toledo, I.
Capeche, J.
Beisker, W.
Pollock, J.
Cedeno Montaña, C. E.
Ivarsen, K
Reichart, D.
Haislip, J.
Lacluyze, A.
author_role author
author2 Sicardy, B.
Ortiz, J. L.
Lellouch, E.
Tancredi, G.
Lecacheux, J.
Vieira Martins, R.
Camargo, J. I. B.
Assafin, M.
Behrend, R.
Vachier, F.
Colas, F.
Morales, N.
Maury, A.
Emilio, M.
Amorim, A.
Unda Sanzana, E.
Roland, S.
Bruzzone, S.
Almeida, L. A.
Rodrigues, C. V.
Jacques, C.
Gil Hutton, Ricardo Alfredo
Vanzi, L.
Milone, A. C.
Schoenell, W.
Salvo, R.
Almenares, L.
Jehin, E
Manfroid, J.
Sposetti, S.
Tanga, P.
Klotz, A.
Frappa, E.
Cacella, P.
Colque, J. P.
Neves, C.
Alvarez, E. M.
Gillon, M.
Pimentel, E.
Giacchini, B.
Roques, F.
Widemann, T.
Magalhães, V. S.
Thirouin, A.
Duffard, Rene Damian
Leiva, R.
Toledo, I.
Capeche, J.
Beisker, W.
Pollock, J.
Cedeno Montaña, C. E.
Ivarsen, K
Reichart, D.
Haislip, J.
Lacluyze, A.
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Kuiper Belt Objects
Occultations
Atmospheres
Transneptunian Object
topic Kuiper Belt Objects
Occultations
Atmospheres
Transneptunian Object
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We present results derived from the first multi-chord stellar occultations by the transneptunian object (50000) Quaoar, observed on 2011 May 4 and 2012 February 17, and from a single-chord occultation observed on 2012 October 15. If the timing of the five chords obtained in 2011 were correct, then Quaoar would possess topographic features (crater or mountain) that would be too large for a body of this mass. An alternative model consists in applying time shifts to some chords to account for possible timing errors. Satisfactory elliptical fits to the chords are then possible, yielding an equivalent radius Requiv = 555±2.5 km and geometric visual albedo pV = 0.109±0.007. Assuming that Quaoar is a Maclaurin spheroid with an indeterminate polar aspect angle, we derive a true oblateness of = 0.087+0.0268 −0.0175, an equatorial radius of 569+24 −17 km, and a density of 1.99 ± 0.46 g cm−3. The orientation of our preferred solution in the plane of the sky implies that Quaoar’s satellite Weywot cannot have an equatorial orbit. Finally, we detect no global atmosphere around Quaoar, considering a pressure upper limit of about 20 nbar for a pure methane atmosphere.
Fil: Braga Ribas, F.. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil; . Laboratoire d;
Fil: Sicardy, B.. Laboratoire d; . Universite Pierre Et Marie Curie; Francia;
Fil: Ortiz, J. L.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España;
Fil: Lellouch, E.. Laboratoire d;
Fil: Tancredi, G.. Observatorio Astronomico Los Molinos; Uruguay;
Fil: Lecacheux, J.. Laboratoire d;
Fil: Vieira Martins, R.. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil; . L; . Universidade Federal Rural do Rio de Janeiro. Observatorio do Valongo; Brasil;
Fil: Camargo, J. I. B.. Ministério de Ciencia, Tecnologia e Innovacao. Observatorio Nacional; Brasil;
Fil: Assafin, M.. Universidade Federal Rural do Rio de Janeiro. Observatorio do Valongo; Brasil;
Fil: Behrend, R.. Observatoire de Geneve; Suiza;
Fil: Vachier, F.. L;
Fil: Colas, F.. L;
Fil: Morales, N.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España;
Fil: Maury, A.. San Pedro de Atacama Celestial Explorations, Chile;
Fil: Emilio, M.. Universidad Stadual de Ponta Grossa; Brasil;
Fil: Amorim, A.. Universidade Federal Da Santa Catarina; Brasil;
Fil: Unda Sanzana, E.. Universidad de Antofagasta. Unidad de Astronomía; Chile;
Fil: Roland, S.. Observatorio Astronomico Los Molinos; Uruguay;
Fil: Bruzzone, S.. Observatorio Astronomico Los Molinos; Uruguay;
Fil: Almeida, L. A.. Centro de Previsao de Tempo e Estudos Climaticos. Instituto Nacional de Pesquisas Espaciais; Brasil;
Fil: Rodrigues, C. V.. Centro de Previsao de Tempo e Estudos Climaticos. Instituto Nacional de Pesquisas Espaciais; Brasil;
Fil: Jacques, C.. Centro de Estudos Astronomicos de Minas Gerais; Brasil;
Fil: Gil Hutton, Ricardo Alfredo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - CONICET - San Juan. Complejo Astronómico; Argentina
Fil: Vanzi, L.. Pontificia Universidad Católica de Chile. Department of Electrical Engineering and Center of Astro-Engineering; Chile;
Fil: Milone, A. C.. Centro de Previsao de Tempo e Estudos Climaticos. Instituto Nacional de Pesquisas Espaciais; Brasil;
Fil: Schoenell, W.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España; . Universidade Federal Da Santa Catarina; Brasil;
Fil: Salvo, R.. Observatorio Astronomico Los Molinos; Uruguay;
Fil: Almenares, L.. Observatorio Astronomico Los Molinos; Uruguay;
Fil: Jehin, E. Université de Liège. Institut d’Astrophysique; Belgica;
Fil: Manfroid, J.. Université de Liège. Institut d’Astrophysique; Belgica;
Fil: Sposetti, S.. Gnosca Observatory, Suiza;
Fil: Tanga, P.. Observatoire de la Cote D; . Universite de Sophia Antipolis. Laboratoire Lagrange; Francia;
Fil: Klotz, A.. Université Toulouse III “Paul Sabatier”. Observatoire Midi-Pyrénées. Institut de Recherche en Astrophysique et Planétologie; Francia;
Fil: Frappa, E.. Euraster, Francia;
Fil: Cacella, P.. Rede de Astronomia Observacional; Brasil;
Fil: Colque, J. P.. Universidad de Antofagasta. Unidad de Astronomía; Chile;
Fil: Neves, C.. Universidad Stadual de Ponta Grossa; Brasil;
Fil: Alvarez, E. M.. Observatorio Los Algarrobos, Uruguay;
Fil: Gillon, M.. Université de Liège. Institut d’Astrophysique; Belgica;
Fil: Pimentel, E.. Centro de Estudos Astronomicos de Minas Gerais; Brasil;
Fil: Giacchini, B.. Centro de Estudos Astronomicos de Minas Gerais; Brasil;
Fil: Roques, F.. Laboratoire d;
Fil: Widemann, T.. Laboratoire d;
Fil: Magalhães, V. S.. Centro de Previsao de Tempo e Estudos Climaticos. Instituto Nacional de Pesquisas Espaciais; Brasil;
Fil: Thirouin, A.. Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España;
Fil: Duffard, Rene Damian. Centro Informático Científico de Andalucía; España; . Consejo Superior de Investigaciones Científicas. Instituto de Astrofísica de Andalucía; España;
Fil: Leiva, R.. Pontificia Universidad Católica de Chile. Department of Electrical Engineering and Center of Astro-Engineering; Chile;
Fil: Toledo, I.. Joint Atacama Large Millimeter/submillimeter Array Observatory; Chile;
Fil: Capeche, J.. Observatorio Astronomico Los Molinos; Uruguay;
Fil: Beisker, W.. International Occultation Timing Association European Section; Alemania;
Fil: Pollock, J.. Appalachian State University. Department of Physics and Astronomy; Estados Unidos;
Fil: Cedeno Montaña, C. E.. Centro de Previsao de Tempo e Estudos Climaticos. Instituto Nacional de Pesquisas Espaciais; Brasil;
Fil: Ivarsen, K. University of North Carolina. Physics and Astronomy Department; Estados Unidos;
Fil: Reichart, D.. University of North Carolina. Physics and Astronomy Department; Estados Unidos;
Fil: Haislip, J.. University of North Carolina. Physics and Astronomy Department; Estados Unidos;
Fil: Lacluyze, A.. University of North Carolina. Physics and Astronomy Department; Estados Unidos;
description We present results derived from the first multi-chord stellar occultations by the transneptunian object (50000) Quaoar, observed on 2011 May 4 and 2012 February 17, and from a single-chord occultation observed on 2012 October 15. If the timing of the five chords obtained in 2011 were correct, then Quaoar would possess topographic features (crater or mountain) that would be too large for a body of this mass. An alternative model consists in applying time shifts to some chords to account for possible timing errors. Satisfactory elliptical fits to the chords are then possible, yielding an equivalent radius Requiv = 555±2.5 km and geometric visual albedo pV = 0.109±0.007. Assuming that Quaoar is a Maclaurin spheroid with an indeterminate polar aspect angle, we derive a true oblateness of = 0.087+0.0268 −0.0175, an equatorial radius of 569+24 −17 km, and a density of 1.99 ± 0.46 g cm−3. The orientation of our preferred solution in the plane of the sky implies that Quaoar’s satellite Weywot cannot have an equatorial orbit. Finally, we detect no global atmosphere around Quaoar, considering a pressure upper limit of about 20 nbar for a pure methane atmosphere.
publishDate 2013
dc.date.none.fl_str_mv 2013-08-10
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/1641
Braga Ribas, F.; Sicardy, B.; Ortiz, J. L.; Lellouch, E.; Tancredi, G.; et al.; The Size, Shape, Albedo, Density, and Atmospheric Limit of Transneptunian Object (50000) Quaoar from Multi-chord Stellar Occultations; American Astronomical Society; Astrophysical Journal; 773; 26; 10-8-2013; 1-13
0004-637X
url http://hdl.handle.net/11336/1641
identifier_str_mv Braga Ribas, F.; Sicardy, B.; Ortiz, J. L.; Lellouch, E.; Tancredi, G.; et al.; The Size, Shape, Albedo, Density, and Atmospheric Limit of Transneptunian Object (50000) Quaoar from Multi-chord Stellar Occultations; American Astronomical Society; Astrophysical Journal; 773; 26; 10-8-2013; 1-13
0004-637X
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/0004-637X/773/1/26/pdf/0004-637X_773_1_26.pdf
info:eu-repo/semantics/altIdentifier/doi/10.1088/0004-637X/773/1/26
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Astronomical Society
publisher.none.fl_str_mv American Astronomical Society
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1846782232309530624
score 12.982451

Publicaciones similares