论文标题
热地还是年轻的金星？附近的过境岩石星球之谜
Hot Earth or Young Venus? A nearby transiting rocky planet mystery
论文作者
论文摘要
金星和地球对岩石行星的演变提供了惊人的不同观点，这提出了一个问题，即这两个岩石世界的进化如此不同。最近发现的Transing Super-Erth LP 890-9C（TOI-4306C，Speculoos-2c）是问题的关键。它在8.46天内圈出附近的M6V星星。 LP890-9C接收到与现代地球相似的通量，这使其非常接近可居住区（Hz）的内边缘，其中模型在预测岩石行星可以保持在水中的时间方面有很大差异。我们在HZ内边缘的热LP890-9C的气氛建模，地球可以维持几种非常不同的环境。最终的变速光谱在热，潮湿的exo-earth，捕获在失控的温室中的热气腾腾的星球和exo-venus之间有很大差异。将这些情景与地球的光谱区分开来，将为热陆地行星演变为Exo-Venus提供关键的新见解。我们的模型和光谱可在线提供作为计划观察的工具。他们表明，观察LP890-9C可以为在HZ内边缘以及地球的长期未来的岩石行星的演变提供关键见解。
Venus and Earth provide astonishingly different views of the evolution of a rocky planet, raising the question of why these two rocky worlds evolved so differently. The recently discovered transiting Super-Earth LP 890-9c (TOI-4306c, SPECULOOS-2c) is a key to the question. It circles a nearby M6V star in 8.46 days. LP890-9c receives similar flux as modern Earth, which puts it very close to the inner edge of the Habitable Zone (HZ), where models differ strongly in their prediction of how long rocky planets can hold onto their water. We model the atmosphere of a hot LP890-9c at the inner edge of the HZ, where the planet could sustain several very different environments. The resulting transmission spectra differ considerably between a hot, wet exo-Earth, a steamy planet caught in a runaway greenhouse, and an exo-Venus. Distinguishing these scenarios from the planet's spectra will provide critical new insights into the evolution of hot terrestrial planets into exo-Venus. Our model and spectra are available online as a tool to plan observations. They show that observing LP890-9c can provide key insights into the evolution of a rocky planet at the inner edge of the HZ as well as the long-term future of Earth.
