Supercatastrophic Disruption of Asteroids in the Context of SOHO Comet, Fireball, and Meteor Observations
作者： Paul Wiegert , Peter Brown , Petr Pokorný , Quanzhi Ye , Cole Gregg
关键词: Physics 、 Comet 、 Asteroid 、 Population 、 Astrobiology 、 Context (language use) 、 Meteoroid 、 Phaeton 、 Meteor (satellite)
摘要: Granvik et al. (2016) report an absence of asteroids on orbits with perihelia near the Sun that they attribute to 'supercatastrophic disruption' these bodies. Here we investigate whether there is evidence for this process among other bodies similarly low perihelia: near-Earth asteroids, SOHO comets, as well meter-sized and millimeter-sized meteoroids. We determine no known have past (last 10^4 years) histories residing significantly inside limit, indirectly supporting disruption hypothesis. The exception asteroid (467372) 2004 LG which spent 2500 years within thus presents a challenge theory. Phaethon has perihelion distance hovering just above limit may be undergoing slow disruption, source its dust complex. find rate at ungrouped comets are observed consistent expected rates injection small (25 m) class into near-Sun region suggest fraction SOHO-observed comet population in fact asteroidal origin. also but excess This implies if disrupt, do not simply fragment chunks disintegrate ultimately particles. propose anomalous brightening destruction processes affect occur through meteoroid erosion, is, removal material impacts by high-speed
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