arXiv 1110.41662011-10astro-ph.EPastro-ph.SR

太阳星云中木星轨道周围的热隙

A Hot Gap Around Jupiter's Orbit in the Solar Nebula

N. J. Turner, M. Choukroun, J. Castillo-Rogez, G. Bryden

备注：: 25 pages, 10 figures. ApJ in press. Discussion of Jupiter's volatile enrichment revised in sec. 4.2
发表信息：: Astrophysical Journal, 748, 92 (2012)
DOI：: 10.1088/0004-637X/748/2/92

摘要：

太阳在其存在的最初几十万年里比现在亮了一个数量级，部分原因是由于从太阳星云吸积的物质释放出的引力能。如果木星已经接近它现在的质量，行星的潮汐会在星云中打开一个光学上薄的缺口。我们使用蒙特卡罗辐射转移计算表明，太阳光吸收的星云和重新辐射到差距提高温度远高于水冰的升华阈值，与潜在的严重后果的冰体在木星的喂养区。如果行星在这个早期的时期靠近它现在的位置，那么一米大小的天体在一个轨道内就会蒸发。尘埃颗粒失去了它们的冰罩，星子部分或完全脱挥发分，这取决于它们的大小。在木星迅速形成的情况下，例如那些涉及早期大质量星云引力不稳定的情况，必须应对高温。通过笼形水合物中的惰性气体来富集木星将更加困难，但可以通过在离恒星更远的地方形成行星或在稍后的时代捕获星子来实现。木星早期起源所产生的热隙也会影响任何原始特洛伊小行星的表面成分。

英文摘要：

The Sun was an order of magnitude more luminous during the first few hundred thousand years of its existence, due in part to the gravitational energy released by material accreting from the Solar nebula. If Jupiter was already near its present mass, the planet's tides opened an optically-thin gap in the nebula. We show using Monte Carlo radiative transfer calculations that sunlight absorbed by the nebula and re-radiated into the gap raised temperatures well above the sublimation threshold for water ice, with potentially drastic consequences for the icy bodies in Jupiter's feeding zone. Bodies up to a meter in size were vaporized within a single orbit if the planet was near its present location during this early epoch. Dust particles lost their ice mantles, and planetesimals were partially to fully devolatilized, depending on their size. Scenarios in which Jupiter formed promptly, such as those involving a gravitational instability of the massive early nebula, must cope with the high temperatures. Enriching Jupiter in the noble gases through delivery trapped in clathrate hydrates will be more difficult, but might be achieved by either forming the planet much further from the star, or capturing planetesimals at later epochs. The hot gap resulting from an early origin for Jupiter also would affect the surface compositions of any primordial Trojan asteroids.

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。

摘要：

英文摘要：

相关论文