First detection of gas-phase methanol in a protoplanetary disk
作者： Eric Herbst , Karin I. Oberg , Catherine Walsh , Tom J. Millar , Hideko Nomura
DOI: 10.3847/2041-8205/823/1/L10
关键词:
摘要: The first detection of gas-phase methanol in a protoplanetary disk (TW Hya) is presented. In addition to being one the largest molecules detected disks date, also organic molecule with an unambiguous ice chemistry origin. stacked emission, as observed ALMA, spectrally resolved and across six velocity channels ($>3 \sigma$), reaching peak signal-to-noise $5.5\sigma$, kinematic pattern expected for TW~Hya. Using appropriate model, fractional abundance $3\times 10^{-12} - 4 \times 10^{-11}$ (with respect H$_2$) reproduces line profile channel maps, favoured dependent upon assumed vertical location (midplane versus molecular layer). emission offset from source position suggesting that has ring-like morphology: analysis here suggests it peaks at $\approx 30$~AU column density 3-6\times10^{12}$~cm$^{-2}$. case TW Hya, larger (up mm-sized) grains, residing inner 50~AU, may thus host bulk reservoir. successful cold implies products can be explored disks, opening window studying complex during planetary system formation.
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