High-resolution observations of the outer disk around T Chamaeleontis: The view from ALMA

Context. Transitional disks are circumstellar disks with dust gaps thought to be related in some cases to planet formation. They can shed light on the planet formation process by the analysis of their gas and dust properties. T Cha is a young star surrounded by a transitional disk with signatures of...

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Detalles Bibliográficos
Autores: Huélamo, N., de Gregorio-Monsalvo, I., Macías, E., Pinte, C., Ireland, M., Tuthill, P., Lacour, S.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/386898
Acceso en línea:http://hdl.handle.net/10261/386898
Access Level:acceso abierto
Palabra clave:Stars: pre-main sequence
Stars: individual: T Chamaeleontis
Protoplanetary disks
Techniques: interferometric
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dc.title.none.fl_str_mv High-resolution observations of the outer disk around T Chamaeleontis: The view from ALMA
title High-resolution observations of the outer disk around T Chamaeleontis: The view from ALMA
spellingShingle High-resolution observations of the outer disk around T Chamaeleontis: The view from ALMA
Huélamo, N.
Stars: pre-main sequence
Stars: individual: T Chamaeleontis
Protoplanetary disks
Techniques: interferometric
title_short High-resolution observations of the outer disk around T Chamaeleontis: The view from ALMA
title_full High-resolution observations of the outer disk around T Chamaeleontis: The view from ALMA
title_fullStr High-resolution observations of the outer disk around T Chamaeleontis: The view from ALMA
title_full_unstemmed High-resolution observations of the outer disk around T Chamaeleontis: The view from ALMA
title_sort High-resolution observations of the outer disk around T Chamaeleontis: The view from ALMA
dc.creator.none.fl_str_mv Huélamo, N.
de Gregorio-Monsalvo, I.
Macías, E.
Pinte, C.
Ireland, M.
Tuthill, P.
Lacour, S.
author Huélamo, N.
author_facet Huélamo, N.
de Gregorio-Monsalvo, I.
Macías, E.
Pinte, C.
Ireland, M.
Tuthill, P.
Lacour, S.
author_role author
author2 de Gregorio-Monsalvo, I.
Macías, E.
Pinte, C.
Ireland, M.
Tuthill, P.
Lacour, S.
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (España)
European Commission
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Stars: pre-main sequence
Stars: individual: T Chamaeleontis
Protoplanetary disks
Techniques: interferometric
topic Stars: pre-main sequence
Stars: individual: T Chamaeleontis
Protoplanetary disks
Techniques: interferometric
description Context. Transitional disks are circumstellar disks with dust gaps thought to be related in some cases to planet formation. They can shed light on the planet formation process by the analysis of their gas and dust properties. T Cha is a young star surrounded by a transitional disk with signatures of planet formation. Aims. The aim of this work is to spatially resolve the outer disk around T Cha and to derive its main properties. Methods. We have obtained high-resolution and high-sensitivity ALMA observations in the CO(3-2), 13CO(3-2), and CS(7-6) emission lines to reveal the spatial distribution of the gaseous disk around the star. In order to study the dust within the disk we have also obtained continuum images at 850 μm from the line-free channels. Results. We have spatially resolved the outer disk around T Cha. Using the CO(3-2) emission we derive a radius of ~230  AU. We also report the detection of the 13CO(3-2) and the CS(7-8) molecular emissions, which show smaller radii than the CO(3-2) detection. The continuum observations at 850  μm allow the spatial resolution of the dusty disk, which shows two emission bumps separated by 40  AU, consistent with the presence of a dust gap in the inner regions of the disk, and an outer radius of 80  AU. Therefore, T Cha is surrounded by a compact dusty disk and a larger and more diffuse gaseous disk, as previously observed in other young stars. The continuum intensity profiles are different at both sides of the disk suggesting possible dust asymmetries. We derive an inclination of i(°) = 67 ± 5, and a position angle of PA(°) = 113 ± 6, for both the gas and dust disks. The comparison of the ALMA data with radiative transfer models shows that the gas and dust components can only be simultaneously reproduced when we include a tapered edge prescription for the surface density profile. The best model suggests that most of the disk mass is placed within a radius of R< 50  AU. Finally, we derive a dynamical mass for the central object of Mâ- 1.5 ± 0.2 Mâ™comparable to the one estimated with evolutionary models for an age of 10 Myr. © ESO, 2015.
publishDate 2015
dc.date.none.fl_str_mv 2015
2025
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
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status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/386898
url http://hdl.handle.net/10261/386898
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
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info:eu-repo/grantAgreement/EC/FP7/284405
info:eu-repo/grantAgreement/MICINN//AYA2011-30228-C03-01
http://dx.doi.org/10.1051/0004-6361/201424404
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dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
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spelling High-resolution observations of the outer disk around T Chamaeleontis: The view from ALMAHuélamo, N.de Gregorio-Monsalvo, I.Macías, E.Pinte, C.Ireland, M.Tuthill, P.Lacour, S.Stars: pre-main sequenceStars: individual: T ChamaeleontisProtoplanetary disksTechniques: interferometricContext. Transitional disks are circumstellar disks with dust gaps thought to be related in some cases to planet formation. They can shed light on the planet formation process by the analysis of their gas and dust properties. T Cha is a young star surrounded by a transitional disk with signatures of planet formation. Aims. The aim of this work is to spatially resolve the outer disk around T Cha and to derive its main properties. Methods. We have obtained high-resolution and high-sensitivity ALMA observations in the CO(3-2), 13CO(3-2), and CS(7-6) emission lines to reveal the spatial distribution of the gaseous disk around the star. In order to study the dust within the disk we have also obtained continuum images at 850 μm from the line-free channels. Results. We have spatially resolved the outer disk around T Cha. Using the CO(3-2) emission we derive a radius of ~230  AU. We also report the detection of the 13CO(3-2) and the CS(7-8) molecular emissions, which show smaller radii than the CO(3-2) detection. The continuum observations at 850  μm allow the spatial resolution of the dusty disk, which shows two emission bumps separated by 40  AU, consistent with the presence of a dust gap in the inner regions of the disk, and an outer radius of 80  AU. Therefore, T Cha is surrounded by a compact dusty disk and a larger and more diffuse gaseous disk, as previously observed in other young stars. The continuum intensity profiles are different at both sides of the disk suggesting possible dust asymmetries. We derive an inclination of i(°) = 67 ± 5, and a position angle of PA(°) = 113 ± 6, for both the gas and dust disks. The comparison of the ALMA data with radiative transfer models shows that the gas and dust components can only be simultaneously reproduced when we include a tapered edge prescription for the surface density profile. The best model suggests that most of the disk mass is placed within a radius of R< 50  AU. Finally, we derive a dynamical mass for the central object of Mâ- 1.5 ± 0.2 Mâ™comparable to the one estimated with evolutionary models for an age of 10 Myr. © ESO, 2015.This paper makes use of the following ALMA data: ADS/JAO.ALMA#2011.0.00921.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This research has been funded by Spanish grants AYA2010-21161-C02-02 and AYA2012-38897-C02-01. I.d.G. and E.M. acknowledge support from MICINN (Spain) AYA2011-30228-C03 grant (including FEDER funds). C.P. acknowledges support from the Millennium Science Initiative (Chilean Ministry of Economy), through grant Nucleus P10-022-F and from the European Commission′s 7th Framework Program (contract 284405).EDP SciencesMinisterio de Ciencia e Innovación (España)European CommissionConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2025202520152025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/386898reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MICINN//AYA2010-21161-C02-02info:eu-repo/grantAgreement/MINECO//AYA2012-38897-C02-01info:eu-repo/grantAgreement/EC/FP7/284405info:eu-repo/grantAgreement/MICINN//AYA2011-30228-C03-01http://dx.doi.org/10.1051/0004-6361/201424404Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3868982026-05-22T06:33:51Z
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