@article{a57db55df1d8486f99aa38201325260a,
title = "A Millimeter-multiwavelength Continuum Study of VLA 1623 West",
abstract = "VLA 1623 West is an ambiguous source that has been described as a shocked cloudlet as well as a protostellar disk. We use deep ALMA 1.3 and 0.87 mm observations to constrain its shape and structure to determine its origins better. We use a series of geometric models to fit the uv visibilities at both wavelengths with GALARIO. Although the real visibilities show structures similar to what has been identified as gaps and rings in protoplanetary disks, we find that a modified flat-topped Gaussian model at high inclination provides the best fit to the observations. This fit agrees well with expectations for an optically thick, highly inclined disk. Nevertheless, we find that the geometric models consistently yield positive residuals at the four corners of the disk at both wavelengths. We interpret these residuals as evidence that the disk is flared in the millimeter dust. We use a simple toy model for an edge-on flared disk and find that the residuals best match a disk with flaring that is mainly restricted to the outer disk at R ≳ 30 au. Thus, VLA 1623W may represent a young protostellar disk where the large dust grains have not yet had enough time to settle into the midplane. This result may have implications for how disk evolution and vertical dust settling impact the initial conditions leading to planet formation.",
author = "Arnaud Michel and Sadavoy, {Sarah I.} and Sheehan, {Patrick D.} and Looney, {Leslie W.} and Cox, {Erin G.}",
note = "Funding Information: We thank the anonymous referee for their constructive and useful suggestions. The authors are grateful to Luca Matr{\`a} and Marco Tazzari for helpful discussions in running GALARIO. A.M. and S.I.S. acknowledge support from the Natural Science and Engineering Research Council of Canada (NSERC), RGPIN-2020-03981. L.W.L. acknowledges support from NSF AST-1910364 and NSF AST-2108794. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan) and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/ NRAO and NAOJ. This paper makes use of the following ALMA data: 2015.1.01112.S and 2015.1.00084.S. Funding Information: We thank the anonymous referee for their constructive and useful suggestions. The authors are grateful to Luca Matr{\`a} and Marco Tazzari for helpful discussions in running GALARIO . A.M. and S.I.S. acknowledge support from the Natural Science and Engineering Research Council of Canada (NSERC), RGPIN-2020-03981. L.W.L. acknowledges support from NSF AST-1910364 and NSF AST-2108794. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan) and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/ NRAO and NAOJ. This paper makes use of the following ALMA data: 2015.1.01112.S and 2015.1.00084.S. Publisher Copyright: {\textcopyright} 2022. The Author(s). Published by the American Astronomical Society.",
year = "2022",
month = oct,
day = "1",
doi = "10.3847/1538-4357/ac905c",
language = "English (US)",
volume = "937",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2",
}