arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1303.2415astro-ph.EP
收藏

近太阳小行星的性质

Properties of Near-Sun Asteroids

David Jewitt

摘要:

太阳附近的小行星可以达到平衡温度,足以通过热断裂、干燥和水合硅酸盐的分解引起表面改性。我们目前的光学观测的9个小行星近日点<0.25 AU(太阳下的温度大于/等于800 K)采取寻找热修改的证据。我们发现,这些对象的宽带颜色是不同的,但统计上无法区分的行星穿越小行星近日点附近1 AU。此外,从近日点拍摄的这些天体的图像显示,没有证据表明可能由于表面的热分解而导致的持续质量损失(取决于模型的极限大约小于/等于1千克/秒)。我们的结论是,虽然热改性可能是近太阳小行星衰变和产生碎片的一个重要过程,但我们的新数据没有提供证据。

英文摘要:

Asteroids near the Sun can attain equilibrium temperatures sufficient to induce surface modification from thermal fracture, desiccation and decomposition of hydrated silicates. We present optical observations of nine asteroids with perihelia <0.25 AU (sub-solar temperatures greater than/equal to 800 K) taken to search for evidence of thermal modification. We find that the broadband colors of these objects are diverse but statistically indistinguishable from those of planet-crossing asteroids having perihelia near 1 AU. Furthermore, images of these bodies taken away from perihelion show no evidence for on-going mass-loss (model-dependent limits roughly less than/equal to 1 kg /s) that might result from thermal disintegration of the surface. We conclude that, while thermal modification may be an important process in the decay of near-Sun asteroids and in the production of debris, our new data provide no evidence for it.

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。

↑