Shadows and asymmetries in the T Tauri disk HD 143006

• Verfasst von: Benisty, Myriam [VerfasserIn]
• Verfasst von: Dullemond, Cornelis [VerfasserIn]
• Titel: Shadows and asymmetries in the T Tauri disk HD 143006
• Titelzusatz: evidence for a misaligned inner disk
• Verf.angabe: 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
• E-Jahr: 2018
• Jahr: 21 November 2018
• Umfang: 14 S.
• Fussnoten: Gesehen am 11.12.2019
• Titel Quelle: Enthalten in: Astronomy and astrophysics
• Ort Quelle: Les Ulis : EDP Sciences, 1969
• Jahr Quelle: 2018
• Band/Heft Quelle: 619(2018) Artikel-Nummer A171, 14 Seiten
• ISSN Quelle: 1432-0746
• DOI: doi:10.1051/0004-6361/201833913
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1587599422

Abstract

<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.