تقرير
Investigating the gas-to-dust ratio in the protoplanetary disk of HD 142527
| العنوان: | Investigating the gas-to-dust ratio in the protoplanetary disk of HD 142527 |
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| المؤلفون: | Soon, Kang-Lou, Momose, Munetake, Muto, Takayuki, Tsukagoshi, Takashi, Kataoka, Akimasa, Hanawa, Tomoyuki, Fukagawa, Misato, Saigo, Kazuya, Shibai, Hiroshi |
| سنة النشر: | 2019 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | We present ALMA observations of the $98.5~\mathrm{GHz}$ dust continuum and the $\mathrm{^{13}CO}~J = 1 - 0$ and $\mathrm{C^{18}O}~J = 1 - 0$ line emissions of the protoplanetary disk associated with HD~142527. The $98.5~\mathrm{GHz}$ continuum shows a strong azimuthal-asymmetric distribution similar to that of the previously reported $336~\mathrm{GHz}$ continuum, with a peak emission in dust concentrated region in the north. The disk is optically thin in both the $98.5~\mathrm{GHz}$ dust continuum and the $\mathrm{C^{18}O}~J = 1 - 0$ emissions. We derive the distributions of gas and dust surface densities, $\Sigma_\mathrm{g}$ and $\Sigma_\mathrm{d}$, and the dust spectral opacity index, $\beta$, in the disk from ALMA Band 3 and Band 7 data. In the analyses, we assume the local thermodynamic equilibrium and the disk temperature to be equal to the peak brightness temperature of $\mathrm{^{13}CO}~J = 3 - 2$ with a continuum emission. The gas-to-dust ratio, $\mathrm{G/D}$, varies azimuthally with a relation $\mathrm{G/D} \propto \Sigma_\mathrm{d}^{-0.53}$, and $\beta$ is derived to be $\approx 1$ and $\approx 1.7$ in the northern and southern regions of the disk, respectively. These results are consistent with the accumulation of larger dust grains in a higher pressure region. In addition, our results show that the peak $\Sigma_\mathrm{d}$ is located ahead of the peak $\Sigma_\mathrm{g}$. If the latter corresponds to a vortex of high gas pressure, the results indicate that the dust is trapped ahead of the vortex, as predicted by some theoretical studies. Comment: 32 pages, 15 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/pasj/psz112 |
| URL الوصول: | http://arxiv.org/abs/1909.06745 |
| رقم الأكسشن: | edsarx.1909.06745 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/pasj/psz112 |
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