论文标题
星际闯入者
The Interstellar Interlopers
论文作者
论文摘要
星际闯入者是在太阳系以外形成的身体，但观察到穿过它。前两个确定的闯入者：1i/`o o o o o o o o o o o o o o umuamua和2i/borisov表现出了出乎意料的不同物理特性。 1i/`oumuamua似乎没有解决，类似小行星，而2i/borisov是气体和灰尘的更类似彗星的来源。这两个对象都在非重力加速的作用下移动。这些闯入者及其不同的特性为我们唯一的窗口提供了迄今为止的巨大且以前未知的银河系。此类对象的数量密度为$ \ sim $ 0.1 au $^{ - 3} $，如果在银河系磁盘上均匀，则意味着以银河系中的方式表示10 $^{25} $至10 $^{26} $相似的对象。闯入者可能形成并从年轻恒星的原月球磁盘中弹出。但是，我们目前拥有的数据太少，无法拒绝其他解释。
Interstellar interlopers are bodies formed outside of the solar system but observed passing through it. The first two identified interlopers, 1I/`Oumuamua and 2I/Borisov, exhibited unexpectedly different physical properties. 1I/`Oumuamua appeared unresolved and asteroid-like whereas 2I/Borisov was a more comet-like source of both gas and dust. Both objects moved under the action of non-gravitational acceleration. These interlopers and their divergent properties provide our only window so far onto an enormous and previously unknown galactic population. The number density of such objects is $\sim$ 0.1 AU$^{-3}$ which, if uniform across the galactic disk, would imply 10$^{25}$ to 10$^{26}$ similar objects in the Milky Way. The interlopers likely formed in, and were ejected from, the protoplanetary disks of young stars. However, we currently possess too little data to firmly reject other explanations.
