論文

査読有り
2017年1月

The Sizes and Depletions of the Dust and Gas Cavities in the Transitional Disk J160421.7-213028

The Astrophysical Journal
  • Ruobing Dong
  • ,
  • Nienke van
  • ,
  • der Marel
  • ,
  • Jun Hashimoto
  • ,
  • Eugene Chiang
  • ,
  • Eiji Akiyama
  • ,
  • Hauyu Baobab Liu
  • ,
  • Takayuki Muto
  • ,
  • Gillian R. Knapp
  • ,
  • Takashi Tsukagoshi
  • ,
  • Joanna Brown
  • ,
  • Simon Bruderer
  • ,
  • Shin Koyamatsu
  • ,
  • Tomoyuki Kudo
  • ,
  • Nagayoshi Ohashi
  • ,
  • Evan Rich
  • ,
  • Mayama Satoshi
  • ,
  • Michihiro Takami
  • ,
  • John Wisniewski
  • ,
  • Yi Yang
  • ,
  • Zhaohuan Zhu
  • ,
  • Motohide Tamura

記述言語
英語
掲載種別
研究論文(学術雑誌)

We report ALMA Cycle 2 observations of 230 GHz (1.3 mm) dust continuum<br />
emission, and $^{12}$CO, $^{13}$CO, and C$^{18}$O J = 2-1 line emission, from<br />
the Upper Scorpius transitional disk [PZ99] J160421.7-213028, with an angular<br />
resolution of ~0&quot;.25 (35 AU). Armed with these data and existing H-band<br />
scattered light observations, we measure the size and depth of the disk&#039;s<br />
central cavity, and the sharpness of its outer edge, in three components:<br />
sub-$\mu$m-sized &quot;small&quot; dust traced by scattered light, millimeter-sized &quot;big&quot;<br />
dust traced by the millimeter continuum, and gas traced by line emission. Both<br />
dust populations feature a cavity of radius $\sim$70 AU that is depleted by<br />
factors of at least 1000 relative to the dust density just outside. The<br />
millimeter continuum data are well explained by a cavity with a sharp edge.<br />
Scattered light observations can be fitted with a cavity in small dust that has<br />
either a sharp edge at 60 AU, or an edge that transitions smoothly over an<br />
annular width of 10 AU near 60 AU. In gas, the data are consistent with a<br />
cavity that is smaller, about 15 AU in radius, and whose surface density at 15<br />
AU is $10^{3\pm1}$ times smaller than the surface density at 70 AU; the gas<br />
density grades smoothly between these two radii. The CO isotopologue<br />
observations rule out a sharp drop in gas surface density at 30 AU or a<br />
double-drop model as found by previous modeling. Future observations are needed<br />
to assess the nature of these gas and dust cavities, e.g., whether they are<br />
opened by multiple as-yet-unseen planets or photoevaporation.

リンク情報
arXiv
http://arxiv.org/abs/arXiv:1701.05189
URL
http://arxiv.org/abs/1701.05189v2