Near-Infrared High-Dispersion Spectroscopic Observations of Water in Comet 81P/Wild 2 with Subaru/IRCS

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Abstract

Abstract Near-infrared high-dispersion spectroscopic observations of comet 81P/Wild 2 were carried out on 2010 January 31 and February 1 by the Subaru telescope with IRCS. We detected two hot-band emission lines of H$_{2}$O: X(1,0,1) 2$_{02}$–X(1,0,0) 3$_{03}$ at 3526.5 cm$^{-1}$ and X(1,0,1) 2$_{11}$–X(1,0,0) 3$_{12}$ at 3514.4 cm$^{-1}$. The water production rate (${Q_{\rm H_{2}O}}$) was determined as (1.21 $\pm$ 0.05) ${\times}$ 10$^{28}$ molecules s$^{-1}$ based on the spherical coma model assuming the rotational temperature of 30 K on February 1. We found that water production rates determined by de Val-Borro et al. (2010, A&A, 521, L50) with Herschel/HIFI were consistent with ours within 3 $\sigma$ error-levels. Furthermore, our result is consistent with previous water production rates determined in the 1997 apparition.

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