Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): V721 CrA and BN CrA have wide and structured disks in the polarised infrared
Year: 2025
Type: article
Abstract: Context . The environment within which stars form and evolve can play a crucial role in shaping their surrounding protoplanetary disks. This is the reason why homogeneous analyses of protoplanetary disks around young stars in the same star-forming region has become of great relevance in recent years. Aims . We present near-infrared scattered-light observations of the disks around two stars of the Corona Australis star-forming region, V721 CrA and BN CrA, obtained with VLT/SPHERE in the H band, as part of the DESTINYS large programme. Our objective is to analyse the morphology of these disks and highlight their main properties. Methods . We adopted an analytical axisymmetric disk model to fit the observations and performed a regression on key disk parameters, namely the dust mass, the height profile, and the inclination. We used RADMC-3D code to produce synthetic observations of the analytical models, with full polarised scattering treatment. Results . Both stars show resolved and extended disks with substructures in the near-IR. The disk of V721 CrA is vertically thicker, radially smaller (∼120 au), and brighter than that of BN CrA (∼190 au). It also shows spiral arms in the inner regions. The disk of BN CrA shows a dark circular lane, which could be either an intrinsic dust gap or a self-cast shadow, and a brightness enhancement along the disk minor axis. Both disks are compatible with the evolutionary stage of their parent subgroup within the CrA region: V721 CrA belongs to the on-cloud part of CrA, which is dustier, denser, and younger, whereas BN CrA is found on the outskirts of the older off-cloud group.
Source: Astronomy and Astrophysics
Institutions: University of Bologna, Osservatorio Astronomico di Padova, National Institute for Astrophysics, Ollscoil na Gaillimhe – University of Galway, Istituto di Radioastronomia di Bologna, Centre National de la Recherche Scientifique, Université Côte d'Azur, Observatoire de la Côte d’Azur, Université Grenoble Alpes, University of Milan, European Southern Observatory, European Southern Observatory, University of Cambridge, University of Hawaiʻi at Mānoa, Universidad Diego Portales
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,865
Awards: G1175115578, G136906088, G210041235, G2262748287, MILLENNIUM NUCLEUS ON YOUNG EXOPLANETS AND THEIR MOONS, G2575235166, G2601397997, G2945112853, G300979063, G34346518, G3452655474, G3480869486, Consolidated Grant Astronomy Observation and Theory 2022-2025, G3681454997, TRACING THE FORMATION HISTORIES OF YOUNG EXOPLANETS, G4042783231, Exoplanet Athmosphere New Emission Transmission Spectra Analysis, G425668148, G434337789, G4910520200, G5080475149, G5180915604, G5195188938, Dust and gas in planet forming discs, G7084143925
OpenAlex ID: W4417133240