木星族彗星10 P/Tempel 2的红外光谱显示的形成遗产
The formation heritage of Jupiter Family Comet 10P/Tempel 2 as revealed by infrared spectroscopy
摘要：
我们目前的光谱和空间信息的主要挥发性物质在彗星10 P/坦普尔2，基于高色散红外光谱UT 2010年7月26日（日心距离Rh = 1.44 AU）和9月18日（Rh = 1.62 AU），以下彗星的近日点通过UT 2010年7月04日。7月26日的水的总生产率是（1.90 +/- 0.12）x 10^28分子s-1，以及六种痕量气体的丰度（相对于水）的最大值为：CH 3OH（1.58% +/-0.23）、C2 H6（0.39% +/-0.04）、NH3（0.83% +/-0.20）和HCN（0.13% +/-0.02）。对水发射谱线强度的详细分析提供了35 +/- 3 K的旋转温度。平均OPR与统计平衡态下的核自旋布居数一致（OPR = 3.01 +/- 0.18），（1-sigma）下限对应于自旋温度> 38 K。我们的测量是同时期的一个射流状功能观察到的光学波长。四个主要挥发物的空间分布显示强烈的增强射流方向，这有利于释放从一个本地化的出口上的核。测得的红外光谱连续谱的峰值要尖锐得多，这与原子核本身的主要贡献是一致的。H2O、CH 3OH和C2 H6的峰值强度在喷流方向上偏移约200 km，表明可能存在分布式源，例如随后在昏迷中升华的冰粒的释放。在UT 9月18日，我们的光谱中没有明显的发射谱线，但我们得到了3 σ上限Q（H2O）< 2.86 x 10^27分子s-1。
英文摘要：
We present spectral and spatial information for major volatile species in Comet 10P/Tempel 2, based on high-dispersion infrared spectra acquired on UT 2010 July 26 (heliocentric distance Rh = 1.44 AU) and September 18 (Rh = 1.62 AU), following the comet's perihelion passage on UT 2010 July 04. The total production rate for water on July 26 was (1.90 +/- 0.12) x 10^28 molecules s-1, and abundances of six trace gases (relative to water) were: CH3OH (1.58% +/- 0.23), C2H6 (0.39% +/- 0.04), NH3 (0.83% +/- 0.20), and HCN (0.13% +/- 0.02). A detailed analysis of intensities for water emission lines provided a rotational temperature of 35 +/- 3 K. The mean OPR is consistent with nuclear spin populations in statistical equilibrium (OPR = 3.01 +/- 0.18), and the (1-sigma) lower bound corresponds to a spin temperature > 38 K. Our measurements were contemporaneous with a jet-like feature observed at optical wavelengths. The spatial profiles of four primary volatiles display strong enhancements in the jet direction, which favors release from a localized vent on the nucleus. The measured IR continuum is much more sharply peaked and is consistent with a dominant contribution from the nucleus itself. The peak intensities for H2O, CH3OH, and C2H6 are offset by ~200 km in the jet direction, suggesting the possible existence of a distributed source, such as the release of icy grains that subsequently sublimed in the coma. On UT September 18, no obvious emission lines were present in our spectra, nevertheless we obtained a 3-sigma upper limit Q(H2O) < 2.86 x 10^27 molecules s-1.
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