exoALMA IV: Substructures, Asymmetries, and the Faint Outer Disk in Continuum Emission
exoALMA IV: Substructures, Asymmetries, and the Faint Outer Disk in Continuum Emission
The exoALMA Large Program targeted a sample of 15 disks to study gas dynamics within these systems, and these observations simultaneously produced continuum data at 0.9 mm (331.6 GHz) with exceptional surface brightness sensitivity at high angular resolution. To provide a robust characterization of the observed substructures, we performed a visibility space analysis of the continuum emission from the exoALMA data, characterizing axisymmetric substructures and nonaxisymmetric residuals obtained by subtracting an axisymmetric model from the observed data. We defined a nonaxisymmetry index and found that the most asymmetric disks predominantly show an inner cavity and consistently present higher values of mass accretion rate and near-infrared excess. This suggests a connection between outer disk dust substructures and inner disk properties. The depth of the data allowed us to describe the azimuthally averaged continuum emission in the outer disk, revealing that larger disks (both in dust and gas) in our sample tend to be gradually tapered compared to the sharper outer edge of more compact sources. Additionally, the data quality revealed peculiar features in various sources, such as shadows, inner disk offsets, tentative external substructures, and a possible dust cavity wall.
Andrés F. Izquierdo、Francois Menard、Tomohiro C. Yoshida、Hsi-Wei Yen、Misato Fukagawa、Brianna Zawadzki、Pietro Curone、Stefano Facchini、Sean M. Andrews、Leonardo Testi、Myriam Benisty、Ian Czekala、Jane Huang、John D. Ilee、Andrea Isella、Giuseppe Lodato、Ryan A. Loomis、Jochen Stadler、Andrew J. Winter、Jaehan Bae、Marcelo Barraza-Alfaro、Gianni Cataldi、Nicolás Cuello、Daniele Fasano、Mario Flock、Maria Galloway-Sprietsma、Himanshi Garg、Cassandra Hall、Kazuhiro Kanagawa、Geoffroy Lesur、Cristiano Longarini、Ryuta Orihara、Christophe Pinte、Daniel J. Price、Giovanni Rosotti、Richard Teague、Gaylor Wafflard-Fernandez、David J. Wilner、Lisa W?lfer
天文学
Andrés F. Izquierdo,Francois Menard,Tomohiro C. Yoshida,Hsi-Wei Yen,Misato Fukagawa,Brianna Zawadzki,Pietro Curone,Stefano Facchini,Sean M. Andrews,Leonardo Testi,Myriam Benisty,Ian Czekala,Jane Huang,John D. Ilee,Andrea Isella,Giuseppe Lodato,Ryan A. Loomis,Jochen Stadler,Andrew J. Winter,Jaehan Bae,Marcelo Barraza-Alfaro,Gianni Cataldi,Nicolás Cuello,Daniele Fasano,Mario Flock,Maria Galloway-Sprietsma,Himanshi Garg,Cassandra Hall,Kazuhiro Kanagawa,Geoffroy Lesur,Cristiano Longarini,Ryuta Orihara,Christophe Pinte,Daniel J. Price,Giovanni Rosotti,Richard Teague,Gaylor Wafflard-Fernandez,David J. Wilner,Lisa W?lfer.exoALMA IV: Substructures, Asymmetries, and the Faint Outer Disk in Continuum Emission[EB/OL].(2025-04-25)[2025-05-07].https://arxiv.org/abs/2504.18725.点此复制
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