The Ophiuchus DIsk Survey Employing ALMA (ODISEA): Complete Size Distributions for the 100 Brightest Disks Across Multiplicity and SED Classes
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2025
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| author | Dasgupta, Anuroop Cieza, Lucas A. Ruilova, Camilo I. Gonzalez Bhowmik, Trisha Chavan, Ms. Prachi Batalla-Falcon, Grace Herczeg, Gregory J. Ruiz-Rodriguez, Dary A. Williams, Jonathan P. Sierra, Anibal Casassus, Simon Guilera, Octavio M. Perez, Sebastian Orcajo, Santiago Nogueira, P. H Hales, Antonio S. Miley, James M. Rannou, Fernando R. Zurlo, Alice |
| author_facet | Dasgupta, Anuroop Cieza, Lucas A. Ruilova, Camilo I. Gonzalez Bhowmik, Trisha Chavan, Ms. Prachi Batalla-Falcon, Grace Herczeg, Gregory J. Ruiz-Rodriguez, Dary A. Williams, Jonathan P. Sierra, Anibal Casassus, Simon Guilera, Octavio M. Perez, Sebastian Orcajo, Santiago Nogueira, P. H Hales, Antonio S. Miley, James M. Rannou, Fernando R. Zurlo, Alice |
| contents | The size of a protoplanetary disk is a fundamental property, yet most remain unresolved, even in nearby star-forming regions (d $\sim$ 140-200 pc). We present the complete continuum size distribution for the $105$ brightest protoplanetary disks (M$_{\text{dust}}$ $\gtrsim$ 2 M$_{\oplus}$) in the Ophiuchus cloud, obtained from ALMA Band 8 (410 GHz) observations at 0.05$^{\prime\prime}$ (7 au) to 0.15$^{\prime\prime}$ (21 au) resolution. This sample includes 54 Class II and 51 Class I and Flat Spectrum sources, providing a comprehensive distribution across evolutionary stages. We measure the Half Width at Half Maximum (HWHM) and the radius encircling $68\%$ of the flux ($R_{68\%}$) for most non-binary disks, yielding the largest flux-limited sample of resolved disks in any star-forming region. The distribution is log-normal with a median value of $\sim$14 au and a logarithmic standard deviation $σ_{\log} = 0.46$ (factor of 2.9 in linear scale). Disks in close binary systems ($<$ 200 au separation) have smaller radii, with median value of $\sim$5 au, indicating efficient radial drift as predicted by dust evolution models. The size distribution for young embedded objects (SED Class I and Flat Spectrum, age $\lesssim$ 1 Myr) is similar to that of Class II objects (age $\sim$ a few Myr), implying that pressure bumps must be common at early disk stages to prevent mm-sized particle migration at au scales. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_15789 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Ophiuchus DIsk Survey Employing ALMA (ODISEA): Complete Size Distributions for the 100 Brightest Disks Across Multiplicity and SED Classes Dasgupta, Anuroop Cieza, Lucas A. Ruilova, Camilo I. Gonzalez Bhowmik, Trisha Chavan, Ms. Prachi Batalla-Falcon, Grace Herczeg, Gregory J. Ruiz-Rodriguez, Dary A. Williams, Jonathan P. Sierra, Anibal Casassus, Simon Guilera, Octavio M. Perez, Sebastian Orcajo, Santiago Nogueira, P. H Hales, Antonio S. Miley, James M. Rannou, Fernando R. Zurlo, Alice Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics The size of a protoplanetary disk is a fundamental property, yet most remain unresolved, even in nearby star-forming regions (d $\sim$ 140-200 pc). We present the complete continuum size distribution for the $105$ brightest protoplanetary disks (M$_{\text{dust}}$ $\gtrsim$ 2 M$_{\oplus}$) in the Ophiuchus cloud, obtained from ALMA Band 8 (410 GHz) observations at 0.05$^{\prime\prime}$ (7 au) to 0.15$^{\prime\prime}$ (21 au) resolution. This sample includes 54 Class II and 51 Class I and Flat Spectrum sources, providing a comprehensive distribution across evolutionary stages. We measure the Half Width at Half Maximum (HWHM) and the radius encircling $68\%$ of the flux ($R_{68\%}$) for most non-binary disks, yielding the largest flux-limited sample of resolved disks in any star-forming region. The distribution is log-normal with a median value of $\sim$14 au and a logarithmic standard deviation $σ_{\log} = 0.46$ (factor of 2.9 in linear scale). Disks in close binary systems ($<$ 200 au separation) have smaller radii, with median value of $\sim$5 au, indicating efficient radial drift as predicted by dust evolution models. The size distribution for young embedded objects (SED Class I and Flat Spectrum, age $\lesssim$ 1 Myr) is similar to that of Class II objects (age $\sim$ a few Myr), implying that pressure bumps must be common at early disk stages to prevent mm-sized particle migration at au scales. |
| title | The Ophiuchus DIsk Survey Employing ALMA (ODISEA): Complete Size Distributions for the 100 Brightest Disks Across Multiplicity and SED Classes |
| topic | Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2501.15789 |