论文标题
铵盐是彗星核上氮的储层，可能是在某些小行星上
Ammonium salts are a reservoir of nitrogen on a cometary nucleus and possibly on some asteroids
论文作者
论文摘要
彗星中测得的氮与碳比率低于太阳，如果彗星中有未知的氮储备，则可以缓解这种差异。彗星67p/churyumov-gerasimenko的核表现出未识别的宽光谱反射率特征，围绕3.2微米，其表面无处不在。在实验室实验的基础上，我们将这种吸收带归因于铵盐在表面上混合了灰尘。条带的深度表明，半维生铵盐是彗星中氮的大量储层，可能在难治性有机物和更多挥发性物种上占主导地位。类似的吸收特征出现在某些小行星的光谱中，这意味着小行星，彗星和父际云之间的组成联系。
The measured nitrogen-to-carbon ratio in comets is lower than for the Sun, a discrepancy which could be alleviated if there is an unknown reservoir of nitrogen in comets. The nucleus of comet 67P/Churyumov-Gerasimenko exhibits an unidentified broad spectral reflectance feature around 3.2 micrometers, which is ubiquitous across its surface. On the basis of laboratory experiments, we attribute this absorption band to ammonium salts mixed with dust on the surface. The depth of the band indicates that semivolatile ammonium salts are a substantial reservoir of nitrogen in the comet, potentially dominating over refractory organic matter and more volatile species. Similar absorption features appear in the spectra of some asteroids, implying a compositional link between asteroids, comets, and the parent interstellar cloud.
