标题： 柯伊伯带双星缺失在哪里？ 显示英文标题

标题： Where are the missing Kuiper Belt binaries?

摘要： 在本文中，我们注意到柯伊伯带中存在一个间隙，质量范围介于$\approx$10$^{19}$-10$^{20}$ kg 之间，相应的，在第四和第五绝对星等之间双星数量稀少，即$H$。 该间隙的低质量端与冷经典种群在400公里处的截断一致，正如OSSOS调查所建议的那样，并且由通过流不稳定性形成的星子模拟所预测。 所有KBO的星等分布是连续的，这意味着间隙中存在许多天体，但该范围内的双星可能已被破坏，或者伴星过于靠近主星和/或太暗，无法被当前一代观测仪器检测到。 在间隙的高质量端，这些天体具有小距离的小卫星，我们发现一个趋势，即随着质量的减少，主星半径与次星半长轴的比率增加。 如果这一趋势继续进入间隙，非开普勒效应应该会使质量测定更加具有挑战性。 显示英文摘要

摘要： In this letter, we call attention to a gap in binaries in the Kuiper belt in the mass range between $\approx$10$^{19}$-10$^{20}$ kg, with a corresponding dearth in binaries between 4th and 5th absolute magnitude $H$. The low-mass end of the gap is consistent with the truncation of the cold classical population at 400 km, as suggested by the OSSOS survey, and predicted by simulations of planetesimal formation by streaming instability. The distribution of magnitudes for all KBOs is continuous, which means that many objects exist in the gap, but the binaries in this range have either been disrupted, or the companions are too close to the primary and/or too dim to be detected with the current generation of observational instruments. At the high-mass side of the gap, the objects have small satellites at small separations, and we find a trend that as mass decreases, the ratio of primary radius to secondary semimajor increases. If this trend continues into the gap, non-Keplerian effects should make mass determination more challenging.