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arXiv 1902.02708astro-ph.SRastro-ph.GA
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原行星盘水发射的高分辨率中红外巡天

A high resolution mid-infrared survey of water emission from protoplanetary disks

Colette Salyk, John Lacy, Matt Richter, Ke Zhang, Klaus Pontoppidan, John S. Carr, Joan R. Najita, Geoffrey A. Blake

摘要:

我们提出了迄今为止最大的调查光谱分辨中红外水排放,光谱与11盘获得的米歇尔和TEXES光谱仪双子座北。在经典金牛座T星周围的8个圆盘中,有6个检测到水的排放。在过渡盘SR 24 N和SR 24 S中未检测到水排放,尽管SR 24 S具有与DoAr 44类似的过渡盘前性质,但确实显示出水排放(Salyk等人,2015年)。在R~ 100,000的情况下,TEXES水光谱具有此时可能的最高光谱分辨率,并且允许进行详细的线形分析。我们发现中红外水发射线类似于CO振转发射中的“窄成分”(Banzatti & Pontoppidan 2015),与几个AU的盘半径一致。发射谱线为单峰或双峰。单峰排放线不能用开普勒圆盘模型产生,这可能表明水参与了为解释单峰CO排放线而提出的圆盘风(Bast等人,2011年; Pontoppidan等人,2011年)。双峰发射谱线可以用来确定谱线发光度下降的半径。对于HL Tau,该测量的衰减半径的下限与13 AU暗环一致(ALMA partnership et al. 2015)。我们还报告变量线/连续比从磁盘周围的DR头和RW Aur,我们属性连续变化和线通量的变化,分别。RW Aur线通量的减少与在可见光波长处观察到的变暗相对应(Rodriguez等人,2013)。

英文摘要:

We present the largest survey of spectrally resolved mid-infrared water emission to date, with spectra for 11 disks obtained with the Michelle and TEXES spectrographs on Gemini North. Water emission is detected in 6 of 8 disks around classical T Tauri stars. Water emission is not detected in the transitional disks SR 24 N and SR 24 S, in spite of SR 24 S having pre-transitional disk properties like DoAr 44, which does show water emission (Salyk et al. 2015). With R~100,000, the TEXES water spectra have the highest spectral resolution possible at this time, and allow for detailed lineshape analysis. We find that the mid-IR water emission lines are similar to the "narrow component" in CO rovibrational emission (Banzatti & Pontoppidan 2015), consistent with disk radii of a few AU. The emission lines are either single peaked, or consistent with a double peak. Single-peaked emission lines cannot be produced with a Keplerian disk model, and may suggest that water participates in the disk winds proposed to explain single-peaked CO emission lines (Bast et al. 2011, Pontoppidan et al. 2011). Double-peaked emission lines can be used to determine the radius at which the line emission luminosity drops off. For HL Tau, the lower limit on this measured dropoff radius is consistent with the 13 AU dark ring (ALMA partnership et al. 2015). We also report variable line/continuum ratios from the disks around DR Tau and RW Aur, which we attribute to continuum changes and line flux changes, respectively. The reduction in RW Aur line flux corresponds with an observed dimming at visible wavelengths (Rodriguez et al. 2013).

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