Sculpting the disk around T Chamaeleontis: an interferometric view*

Astronomy and Astrophysics 552 (2013): A4 reproduced with permission from Astronomy and Astrophysics

Detalhes bibliográficos
Autores: Olofsson, Johan, Benisty, Myriam, Lacour, Sylvestre, Crida, Aurélien, Burtscher, Leonard, Meeus, Gwendolyn, Ratzka, Thorsten, Pinte, Christophe, Malbet, Fabien, Lazareff, Bernard, Le Bouquin, Jean-Baptiste, Berger, Jean-Philippe, Ménard, François C., Augereau, Jean Charles, Traub, Wesley, Heninng, Th.
Tipo de documento: artigo
Data de publicação:2013
País:España
Recursos:Universidad Autónoma de Madrid
Repositório:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:inglês
OAI Identifier:oai:repositorio.uam.es:10486/662571
Acesso em linha:http://hdl.handle.net/10486/662571
https://dx.doi.org/10.1051/0004-6361/201220675
Access Level:Acceso aberto
Palavra-chave:Circumstellar matter
Infrared: stars
Stars: individual: T Cha
Techniques: interferometric
Física
id ES_c0c8e6fefe47e61a1af0cc2deaa02341
oai_identifier_str oai:repositorio.uam.es:10486/662571
network_acronym_str ES
network_name_str España
repository_id_str
spelling Sculpting the disk around T Chamaeleontis: an interferometric view*Olofsson, JohanBenisty, MyriamLacour, SylvestreCrida, AurélienBurtscher, LeonardMeeus, GwendolynRatzka, ThorstenPinte, ChristopheMalbet, FabienLazareff, BernardLe Bouquin, Jean-BaptisteBerger, Jean-PhilippeMénard, François C.Augereau, Jean CharlesTraub, WesleyHeninng, Th.Circumstellar matterInfrared: starsStars: individual: T ChaTechniques: interferometricFísicaAstronomy and Astrophysics 552 (2013): A4 reproduced with permission from Astronomy and AstrophysicsContext. Circumstellar disks are believed to be the birthplace of planets and are expected to dissipate on a timescale of a few Myr. The processes responsible for the removal of the dust and gas will strongly modify the radial distribution of the circumstellar matter and consequently the spectral energy distribution. In particular, a young planet will open a gap, resulting in an inner disk dominating the near-IR emission and an outer disk emitting mostly in the far-infrared. Aims. We analyze a full set of data involving new near-infrared data obtained with the 4-telescope combiner (VLTI/PIONIER), new mid-infrared interferometric VLTI/MIDI data, literature photometric and archival data from VLT/NaCo/SAM to constrain the structure of the transition disk around T Cha. Methods. After a preliminary analysis with a simple geometric model, we used the MCFOST radiative transfer code to simultaneously model the SED and the interferometric observables from raytraced images in the H-, L′-, and N-bands. Results. We find that the dust responsible for the strong emission in excess in the near-IR must have a narrow temperature distribution with a maximum close to the silicate sublimation temperature. This translates into a narrow inner dusty disk (0.07-0.11 AU), with a significant height (H/r ∼ 0.2) to increase the geometric surface illuminated by the central star. We find that the outer disk starts at about 12 AU and is partially resolved by the PIONIER, SAM, and MIDI instruments. We discuss the possibility of a self-shadowed inner disk, which can extend to distances of several AU. Finally, we show that the SAM closure phases, interpreted as the signature of a candidate companion, may actually trace the asymmetry generated by forward scattering by dust grains in the upper layers of the outer disk. These observations help constrain the inclination and position angle of the disk to about + 58 and - 70, respectively. Conclusions. The circumstellar environment of T Cha appears to be best described by two disks spatially separated by a large gap. The presence of matter (dust or gas) inside the gap is, however, difficult to assess with present-day observations. Our model suggests the outer disk contaminates the interferometric signature of any potential companion that could be responsible for the gap opening, and such a companion still has to be unambiguously detected. We stress the difficulty to observe point sources in bright massive disks, and the consequent need to account for disk asymmetries (e.g. anisotropic scattering) in model-dependent search for companionsFunding from the European Commission’s 7th Framework Program (contract PERG06-GA- 2009-256513) and from Agence Nationale pour la Recherche (ANR) of France under contract ANR-2010-JCJC-0504-01. CNRS is acknowledged for having supported this work in the form of Guaranteed Time Observations (program 089.C-0537(A))ESODepartamento de Física TeóricaFacultad de Ciencias20132013-03-18research articlehttp://purl.org/coar/resource_type/c_2df8fbb1VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10486/662571https://dx.doi.org/10.1051/0004-6361/201220675reponame:Biblos-e Archivo. Repositorio Institucional de la UAMinstname:Universidad Autónoma de MadridInglésengEuropean Commission http://dx.doi.org/10.13039/501100000780 Framework Programme Seven 256513open accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.uam.es:10486/6625712026-06-23T12:46:27Z
dc.title.none.fl_str_mv Sculpting the disk around T Chamaeleontis: an interferometric view*
title Sculpting the disk around T Chamaeleontis: an interferometric view*
spellingShingle Sculpting the disk around T Chamaeleontis: an interferometric view*
Olofsson, Johan
Circumstellar matter
Infrared: stars
Stars: individual: T Cha
Techniques: interferometric
Física
title_short Sculpting the disk around T Chamaeleontis: an interferometric view*
title_full Sculpting the disk around T Chamaeleontis: an interferometric view*
title_fullStr Sculpting the disk around T Chamaeleontis: an interferometric view*
title_full_unstemmed Sculpting the disk around T Chamaeleontis: an interferometric view*
title_sort Sculpting the disk around T Chamaeleontis: an interferometric view*
dc.creator.none.fl_str_mv Olofsson, Johan
Benisty, Myriam
Lacour, Sylvestre
Crida, Aurélien
Burtscher, Leonard
Meeus, Gwendolyn
Ratzka, Thorsten
Pinte, Christophe
Malbet, Fabien
Lazareff, Bernard
Le Bouquin, Jean-Baptiste
Berger, Jean-Philippe
Ménard, François C.
Augereau, Jean Charles
Traub, Wesley
Heninng, Th.
author Olofsson, Johan
author_facet Olofsson, Johan
Benisty, Myriam
Lacour, Sylvestre
Crida, Aurélien
Burtscher, Leonard
Meeus, Gwendolyn
Ratzka, Thorsten
Pinte, Christophe
Malbet, Fabien
Lazareff, Bernard
Le Bouquin, Jean-Baptiste
Berger, Jean-Philippe
Ménard, François C.
Augereau, Jean Charles
Traub, Wesley
Heninng, Th.
author_role author
author2 Benisty, Myriam
Lacour, Sylvestre
Crida, Aurélien
Burtscher, Leonard
Meeus, Gwendolyn
Ratzka, Thorsten
Pinte, Christophe
Malbet, Fabien
Lazareff, Bernard
Le Bouquin, Jean-Baptiste
Berger, Jean-Philippe
Ménard, François C.
Augereau, Jean Charles
Traub, Wesley
Heninng, Th.
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Departamento de Física Teórica
Facultad de Ciencias
dc.subject.none.fl_str_mv Circumstellar matter
Infrared: stars
Stars: individual: T Cha
Techniques: interferometric
Física
topic Circumstellar matter
Infrared: stars
Stars: individual: T Cha
Techniques: interferometric
Física
description Astronomy and Astrophysics 552 (2013): A4 reproduced with permission from Astronomy and Astrophysics
publishDate 2013
dc.date.none.fl_str_mv 2013
2013-03-18
dc.type.none.fl_str_mv research article
http://purl.org/coar/resource_type/c_2df8fbb1
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10486/662571
https://dx.doi.org/10.1051/0004-6361/201220675
url http://hdl.handle.net/10486/662571
https://dx.doi.org/10.1051/0004-6361/201220675
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv European Commission http://dx.doi.org/10.13039/501100000780 Framework Programme Seven 256513
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv ESO
publisher.none.fl_str_mv ESO
dc.source.none.fl_str_mv reponame:Biblos-e Archivo. Repositorio Institucional de la UAM
instname:Universidad Autónoma de Madrid
instname_str Universidad Autónoma de Madrid
reponame_str Biblos-e Archivo. Repositorio Institucional de la UAM
collection Biblos-e Archivo. Repositorio Institucional de la UAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869418506658775040
score 15,301603

Registros relacionados