Compact Disks in a High-resolution ALMA Survey of Dust Structures in the Taurus Molecular Cloud
| Autor: | Elisabetta Rigliaco, Marco Tazzari, Ricardo López-Valdivia, Paola Pinilla, Daniel Harsono, Doug Johnstone, Colette Salyk, Giuseppe Lodato, Carlo F. Manara, Gerrit van der Plas, Feng Long, François Ménard, William J. Fischer, Andrea Banzatti, Nathanial P. Hendler, Gregory N. Mace, Brunella Nisini, Suzan Edwards, Gregory J. Herczeg, Yao Liu, Giovanni Dipierro, Michael Gully-Santiago, Enrico Ragusa, Ilaria Pascucci, Yann Boehler, Sylvie Cabrit, Gijs D. Mulders |
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| Přispěvatelé: | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)), Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Brightness
010504 meteorology & atmospheric sciences FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Power law 0103 physical sciences High spatial resolution 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences Earth and Planetary Astrophysics (astro-ph.EP) Physics [PHYS]Physics [physics] Molecular cloud Astronomy and Astrophysics Atacama Large Millimeter Array Astrophysics - Astrophysics of Galaxies Wavelength Stars Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Millimeter Astrophysics::Earth and Planetary Astrophysics [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | The Astrophysical Journal The Astrophysical Journal, American Astronomical Society, 2019, 882 (1), pp.49. ⟨10.3847/1538-4357/ab2d2d⟩ Astrophysical Journal (0004-637X), 882(1), 49 |
| ISSN: | 0004-637X 1538-4357 1538-3881 1538-3873 0067-0049 0004-6361 0002-7537 |
| Popis: | We present a high-resolution ($\sim0.''12$, $\sim16$ au, mean sensitivity of $50~\mu$Jy~beam$^{-1}$ at 225 GHz) snapshot survey of 32 protoplanetary disks around young stars with spectral type earlier than M3 in the Taurus star-forming region using Atacama Large Millimeter Array (ALMA). This sample includes most mid-infrared excess members that were not previously imaged at high spatial resolution, excluding close binaries and highly extincted objects, thereby providing a more representative look at disk properties at 1--2 Myr. Our 1.3 mm continuum maps reveal 12 disks with prominent dust gaps and rings, 2 of which are around primary stars in wide binaries, and 20 disks with no resolved features at the observed resolution (hereafter smooth disks), 8 of which are around the primary star in wide binaries. The smooth disks were classified based on their lack of resolved substructures, but their most prominent property is that they are all compact with small effective emission radii ($R_{\rm eff,95\%} \lesssim 50$ au). In contrast, all disks with $R_{\rm eff,95\%}$ of at least 55 au in our sample show detectable substructures. Nevertheless, their inner emission cores (inside the resolved gaps) have similar peak brightness, power law profiles, and transition radii to the compact smooth disks, so the primary difference between these two categories is the lack of outer substructures in the latter. These compact disks may lose their outer disk through fast radial drift without dust trapping, or they might be born with small sizes. The compact dust disks, as well as the inner disk cores of extended ring disks, that look smooth at the current resolution will likely show small-scale or low-contrast substructures at higher resolution. The correlation between disk size and disk luminosity correlation demonstrates that some of the compact disks are optically thick at millimeter wavelengths. Comment: ApJ accepted, 25 pages, 11 figures |
| Databáze: | OpenAIRE |
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