High-resolution ALMA observations of compact discs in the wide-binary system Sz 65 and Sz 66

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dc.contributor.authorMiley, J. M.
dc.contributor.authorCarpenter, J.
dc.contributor.authorBooth, R.
dc.contributor.authorJennings, J.
dc.contributor.authorHaworth, T. J.
dc.contributor.authorVioque, M.
dc.contributor.authorAndrews, S.
dc.contributor.authorWilner, D.
dc.contributor.authorBenisty, M.
dc.contributor.authorHuang, J.
dc.contributor.authorPerez, L.
dc.contributor.authorGuzman, V.
dc.contributor.authorRicci, L.
dc.contributor.authorIsella, A.
dc.date.accessioned2025-01-20T17:08:37Z
dc.date.available2025-01-20T17:08:37Z
dc.date.issued2024
dc.description.abstractContext. 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.
dc.fuente.origenWOS
dc.identifier.doi10.1051/0004-6361/202347135
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202347135
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90968
dc.identifier.wosidWOS:001158700100002
dc.language.isoen
dc.revistaAstronomy & astrophysics
dc.rightsacceso restringido
dc.subjectplanet-disk interactions
dc.subjectstars: pre-main sequence
dc.subjectprotoplanetary disks
dc.titleHigh-resolution ALMA observations of compact discs in the wide-binary system Sz 65 and Sz 66
dc.typeartículo
dc.volumen682
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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