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arXiv 1808.09699astro-ph.EP
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火星季节性暗流干尘风起源的观测证据

Observational evidence for a dry dust-wind origin of Mars seasonal dark flows

Mathieu Vincendon, Cédric Pilorget, John Carter, Aurélien Stcherbinine

摘要:

温暖斜坡上的季节性流动,或循环的斜坡线(“RSL”),已被提出作为火星上目前流动水的有力证据。这一假设得到了活动和温暖温度之间的相关性以及水合盐的光谱鉴定的支持。在这里,我们首先证明,盐光谱识别是不强大的,和流量活动发生在更广泛的季节和坡度方向比以前认为,排除液态水作为一个可能的贡献者。然后,我们表明,流动活动的形态,位置和时间是完全一致的去除和沉积的明亮的灰尘以上的黑暗的下垫面发生显着的关系,季节性沙尘暴活动。因此,火星反复出现的斜坡线与现今干燥的火星上典型的尘埃运动是一致的。

英文摘要:

Seasonal flows on warm slopes, or recurring slope lineae ("RSL"), have been presented as strong evidence for currently flowing water on Mars. This assumption was supported by a correlation between activity and warm temperatures, and by the spectral identification of hydrated salts. Here we first demonstrate that salts spectral identification is not robust, and that flow activity occurs on a wider range of seasons and slope orientations than previously thought, ruling out liquid water as a probable contributor. We then show that morphology, location and timing of flow activity is fully consistent with the removal and deposition of bright dust above darker underlying surfaces occurring notably in relation with seasonal dust storm activity. Mars recurring slope lineae are thus consistent with dust movements typical of present-day dry planet Mars.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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