Browsing by Author "Benisty, M."

Now showing 1 - 4 of 4
  • Thumbnail Image
    Item
    A family portrait of disk inner rims around Herbig Ae/Be stars Hunting for warps, rings, self shadowing, and misalignments in the inner astronomical units
    (2020) Kluska, J.; Berger, J. P.; Malbet, F.; Lazareff, B.; Benisty, M.; Le Bouquin, J. B.; Absil, O.; Baron, F.; Delboulbe, A.; Lachaume, Regis; Duvert, G.; Isella, A.; Jocou, L.; Juhasz, A.; Kraus, S.; Menard, F.; Millan Gabet, R.; Monnier, J. D.; Moulin, T.; Perraut, K.; Pinte, C.; Rochat, S.; Soulez, F.; Tallon, M.; Thi, W. F.; Thiebaut, E.; Traub, W.; Zins, G.
  • Thumbnail Image
    Item
    High-resolution ALMA observations of compact discs in the wide-binary system Sz 65 and Sz 66
    (2024) Miley, J. M.; Carpenter, J.; Booth, R.; Jennings, J.; Haworth, T. J.; Vioque, M.; Andrews, S.; Wilner, D.; Benisty, M.; Huang, J.; Perez, L.; Guzman, V.; Ricci, L.; Isella, A.
    Context. Substructures in disc density are ubiquitous in the bright extended discs that are observed with high resolution. These substructures are intimately linked to the physical mechanisms driving planet formation and disc evolution. Surveys of star-forming regions find that most discs are in fact compact, less luminous, and do not exhibit these same substructures. It remains unclear whether compact discs also have similar substructures or if they are featureless. This suggests that different planet formation and disc evolution mechanisms operate in these discs. Aims. We investigated evidence of substructure within two compact discs around the stars Sz 65 and Sz 66 using high angular resolution observations with ALMA at 1.3 mm. The two stars form a wide-binary system with 6 ''.36 separation. The continuum observations achieve a synthesised beam size of 0 ''.026 x 0 ''.018, equivalent to about 4.0 x 2.8 au, enabling a search for substructure on these spatial scales and a characterisation of the gas and dust disc sizes with high precision. Methods. We analysed the data in the image plane through an analysis of reconstructed images, as well as in the uv plane by non-parametrically modelling the visibilities and by an analysis of the (CO)-C-12 (2-1) emission line. Comparisons were made with highresolution observations of compact discs and radially extended discs. Results. We find evidence of substructure in the dust distribution of Sz 65, namely a shallow gap centred at approximate to 20 au, with an emission ring exterior to it at the outer edge of the disc. Ninety percent of the measured continuum flux is found within 27 au, and the distance for (CO)-C-12 is 161 au. The observations show that Sz 66 is very compact: 90% of the flux is contained within 16 au, and 90% of the molecular gas flux lies within 64 au. Conclusions. While the overall prevalence and diversity of substructure in compact discs relative to larger discs is yet to be determined, we find evidence that substructures can exist in compact discs.
  • No Thumbnail Available
    Item
    Ongoing flyby in the young multiple system UX Tauri
    (2020) Menard, F.; Cuello, N.; Ginski, C.; van der Plas, G.; Villenave, M.; Gonzalez, J-F; Pinte, C.; Benisty, M.; Boccaletti, A.; Price, D. J.; Boehler, Y.; Chripko, S.; de Boer, J.; Dominik, C.; Garufi, A.; Gratton, R.; Hagelberg, J.; Henning, Th; Langlois, M.; Maire, A. L.; Pinilla, P.; Ruane, G. J.; Schmid, H. M.; van Holstein, R. G.; Vigan, A.; Zurlo, A.; Hubin, N.; Pavlov, A.; Rochat, S.; Sauvage, J-F; Stadler, E.
    We present observations of the young multiple system UX Tauri to look for circumstellar disks and for signs of dynamical interactions. We obtained SPHERE/IRDIS deep differential polarization images in the J and H bands. We also used ALMA archival CO data. Large extended spirals are well detected in scattered light coming out of the disk of UX Tau A. The southern spiral forms a bridge between UX Tau A and C. These spirals, including the bridge connecting the two stars, all have a CO (3-2) counterpart seen by ALMA. The disk of UX Tau C is detected in scattered light. It is much smaller than the disk of UX Tau A and has a major axis along a different position angle, suggesting a misalignment. We performed PHANTOM SPH hydrodynamical models to interpret the data. The scattered light spirals, CO emission spirals and velocity patterns of the rotating disks, and the compactness of the disk of UX Tau C all point to a scenario in which UX Tau A has been perturbed very recently (similar to 1000 years) by the close passage of UX Tau C.
  • Thumbnail Image
    Item
    Structure of Herbig AeBe disks at the milliarcsecond scale : a statistical survey in the H band using PIONIER VLTI.
    (2017) Lazareff, B.; Lachaume, Regis; Berger, Jean-Philippe.; Kluska, J.; Le Bouquin, J.-B.; Benisty, M.; Malbet, Fabien.; Koen, C.; Pinte, C.; Thi, W.-F.; Absil, O.