Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/26811
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Pohl, A. | en_US |
dc.contributor.author | Sissa, E. | en_US |
dc.contributor.author | Langlois, M. | en_US |
dc.contributor.author | Müller, A. | en_US |
dc.contributor.author | Ginski, C. | en_US |
dc.contributor.author | van Holstein, R. G. | en_US |
dc.contributor.author | Vigan, A. | en_US |
dc.contributor.author | MESA, DINO | en_US |
dc.contributor.author | Maire, A. -L. | en_US |
dc.contributor.author | Henning, Th. | en_US |
dc.contributor.author | GRATTON, Raffaele | en_US |
dc.contributor.author | Olofsson, J. | en_US |
dc.contributor.author | van Boekel, R. | en_US |
dc.contributor.author | Benisty, M. | en_US |
dc.contributor.author | Biller, B. | en_US |
dc.contributor.author | Boccaletti, A. | en_US |
dc.contributor.author | Chauvin, G. | en_US |
dc.contributor.author | Daemgen, S. | en_US |
dc.contributor.author | de Boer, J. | en_US |
dc.contributor.author | DESIDERA, Silvano | en_US |
dc.contributor.author | Dominik, C. | en_US |
dc.contributor.author | GARUFI, ANTONIO | en_US |
dc.contributor.author | Janson, M. | en_US |
dc.contributor.author | Kral, Q. | en_US |
dc.contributor.author | Ménard, F. | en_US |
dc.contributor.author | Pinte, C. | en_US |
dc.contributor.author | Stolker, T. | en_US |
dc.contributor.author | Szulágyi, J. | en_US |
dc.contributor.author | Zurlo, A. | en_US |
dc.contributor.author | Bonnefoy, M. | en_US |
dc.contributor.author | Cheetham, A. | en_US |
dc.contributor.author | Cudel, M. | en_US |
dc.contributor.author | Feldt, M. | en_US |
dc.contributor.author | Kasper, M. | en_US |
dc.contributor.author | Lagrange, A. -M. | en_US |
dc.contributor.author | Perrot, C. | en_US |
dc.contributor.author | Wildi, F. | en_US |
dc.date.accessioned | 2020-08-25T14:28:00Z | - |
dc.date.available | 2020-08-25T14:28:00Z | - |
dc.date.issued | 2017 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/26811 | - |
dc.description.abstract | Context. The transition disk around the T Tauri star T Cha possesses a large gap, making it a prime target for high-resolution imaging in the context of planet formation. <BR /> Aims: We aim to find signs of disk evolutionary processes by studying the disk geometry and the dust grain properties at its surface, and to search for companion candidates. <BR /> Methods: We analyze a set of VLT/SPHERE data at near-infrared and optical wavelengths. We performed polarimetric imaging of T Cha with IRDIS (1.6 μm) and ZIMPOL (0.5-0.9 μm), and obtained intensity images from IRDIS dual-band imaging with simultaneous spectro-imaging with IFS (0.9-1.3 μm). <BR /> Results: The disk around T Cha is detected in all observing modes and its outer disk is resolved in scattered light with unprecedented angular resolution and signal-to-noise. The images reveal a highly inclined disk with a noticeable east-west brightness asymmetry. The significant amount of non-azimuthal polarization signal in the U<SUB>φ</SUB> images, with a U<SUB>φ</SUB>/Q<SUB>φ</SUB> peak-to-peak value of 14%, is in accordance with theoretical studies on multiple scattering in an inclined disk. Our optimal axisymmetric radiative transfer model considers two coplanar inner and outer disks, separated by a gap of 0.̋28 ( 30 au) in size, which is larger than previously thought. We derive a disk inclination of 69 deg and PA of 114 deg. In order to self-consistently reproduce the intensity and polarimetric images, the dust grains, responsible for the scattered light, need to be dominated by sizes of around ten microns. A point source is detected at an angular distance of 3.5'' from the central star. It is, however, found not to be co-moving. <BR /> Conclusions: We confirm that the dominant source of emission is forward scattered light from the near edge of the outer disk. Our point source analysis rules out the presence of a companion with mass larger than 8.5 M<SUB>jup</SUB> between 0.̋1 and 0.̋3. The detection limit decreases to 2 M<SUB>jup</SUB> for 0.̋3 to 4.0''. <P />Based on observations made with European Southern Observatory (ESO) telescopes at the Paranal Observatory in Chile, under program IDs 095.C-0298(B), 096.C-0248(B) and 096.C-0248(C). | en_US |
dc.language.iso | eng | en_US |
dc.title | New constraints on the disk characteristics and companion candidates around T Chamaeleontis with VLT/SPHERE | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201630234 | en_US |
dc.identifier.scopus | 2-s2.0-85028943734 | en_US |
dc.identifier.isi | 000412231200112 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/abs/2017/09/aa30234-16/aa30234-16.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 605 | en_US |
dc.relation.firstpage | A34 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | sì | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | ASTRONOMY & ASTROPHYSICS | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2017A&A...605A..34P | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Padova | - |
crisitem.author.dept | O.A. Padova | - |
crisitem.author.dept | O.A. Padova | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.orcid | 0000-0001-8467-1933 | - |
crisitem.author.orcid | 0000-0003-2195-6805 | - |
crisitem.author.orcid | 0000-0001-8613-2589 | - |
crisitem.author.orcid | 0000-0002-4266-0643 | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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File | Descrizione | Dimensioni | Formato | |
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aa30234-16.pdf | Pdf editoriale | 10.85 MB | Adobe PDF | Visualizza/apri |
1705.03477.pdf | 11.11 MB | Adobe PDF | Visualizza/apri | |
26811-aa30234-16_P01.pdf | Miur | 8.08 MB | Adobe PDF | |
26811-aa30234-16_P02.pdf | Miur | 2.86 MB | Adobe PDF |
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