低温等离子体致红：外太阳系天体颜色多样性的新解释
Cryogenic-specific reddish coloration by cryoplasma: New explanation to color diversity of outer solar system objects
摘要：
外太阳系冰体的红色和颜色多样性是了解太阳系现状和历史的重要线索之一。然而，颜色分布的起源仍然存在争议。在这里，我们展示了红色的颜色，这是稳定的，只有在低温下在实验室实验。在85 K下，用含氮低温等离子体辐照含甲醇和水的冰，产生微红色。当冰被加热时，红色在视觉上褪色并在120-150 K时消失，不像众所周知的耐火有机托林，即使加热到室温也是稳定的。这种在低温条件下的红颜色的温度依赖性可以为太阳系外的太阳附近没有红外颜色提供一个新的可能的解释。我们的结果表明，一种低温环境下特有的红色物质对于研究外太阳系的颜色多样性和形成机制是有用的。
英文摘要：
Reddish coloration and color diversity among icy bodies in the outer solar system are one of the significant clues for understanding the status and history of the solar system. However, the origin of color distribution remains debatable. Here, we demonstrate reddish coloration that is stable only at cryogenic temperatures in a laboratory experiment. The reddish coloration was produced on methanol- and water-containing ice irradiated with nitrogen-containing cryoplasma at 85 K. The reddish color visually faded and disappeared at 120-150 K as the ice was heated, unlike well-known refractory organic tholins that are stable even when heated to room temperature. This temperature dependence of reddish coloration under cryogenic conditions could provide a new possible explanation for the absence of ultra-red coloration closer to the Sun in the outer solar system. Our result implies that a reddish material specific to cryogenic environments is useful for the investigation of color diversity and formation mechanism of the outer solar system.
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