Shadows and asymmetries in the T Tauri disk HD 143006: evidence for a misaligned inner disk
<i>Context.<i/> While planet formation is thought to occur early in the history of a protoplanetary disk, the presence of planets embedded in disks, or of other processes driving disk evolution, might be traced from their imprints on the disk structure.<i>Aims.<i/> We study t...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
21 November 2018
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| In: |
Astronomy and astrophysics
Year: 2018, Volume: 619 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/201833913 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1051/0004-6361/201833913 Verlag: https://www.aanda.org/articles/aa/pdf/2018/11/aa33913-18.pdf 
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| Author Notes: | M. Benisty, A. Juhász, S. Facchini, P. Pinilla, J. de Boer, L.M. Pérez, M. Keppler, G. Muro-Arena, M. Villenave, S. Andrews, C. Dominik, C.P. Dullemond, A. Gallenne, A. Garufi, C. Ginski, and A. Isella |
| Summary: | <i>Context.<i/> While planet formation is thought to occur early in the history of a protoplanetary disk, the presence of planets embedded in disks, or of other processes driving disk evolution, might be traced from their imprints on the disk structure.<i>Aims.<i/> We study the morphology of the disk around the T Tauri star HD 143006, located in the ~5-11 Myr-old Upper Sco region, and we look for signatures of the mechanisms driving its evolution.<i>Methods.<i/> We observed HD 143006 in polarized scattered light with VLT/SPHERE at near-infrared (<i>J<i/>-band, 1.2 <i>μ<i/>m) wavelengths, reaching an angular resolution of ~0.037′′ (~6 au). We obtained two datasets, one with a 145 mas diameter coronagraph, and the other without, enabling us to probe the disk structure down to an angular separation of ~0.06′′ (~10 au).<i>Results.<i/> In our observations, the disk of HD 143006 is clearly resolved up to ~0.5′′ and shows a clear large-scale asymmetry with the eastern side brighter than the western side. We detect a number of additional features, including two gaps and a ring. The ring shows an overbrightness at a position angle (PA) of ~140°, extending over a range in position angle of ~60°, and two narrow dark regions. The two narrow dark lanes and the overall large-scale asymmetry are indicative of shadowing effects, likely due to a misaligned inner disk. We demonstrate the remarkable resemblance between the scattered light image of HD 143006 and a model prediction of a warped disk due to an inclined binary companion. The warped disk model, based on the hydrodynamic simulations combined with three-dimensional radiative transfer calculations, reproduces all major morphological features. However, it does not account for the observed overbrightness at PA ~ 140°.<i>Conclusions.<i/> Shadows have been detected in several protoplanetary disks, suggesting that misalignment in disks is not uncommon. However, the origin of the misalignment is not clear. As-yet-undetected stellar or massive planetary companions could be responsible for them, and naturally account for the presence of depleted inner cavities. |
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| Item Description: | Gesehen am 11.12.2019 |
| Physical Description: | Online Resource |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/201833913 |