标题： 自转状态的X复杂小行星在内主带——I. 探究阿索尔和齐塔碰撞家族 显示英文标题

标题： Spin states of X-complex asteroids in the inner main belt -- I. Investigating the Athor and Zita collisional families

摘要： 我们研究的目标是表征Athor和Zita碰撞家族成员的自旋状态，并检验这些成员是否具有与各自家族母小行星破裂后共同起源一致的自旋分布。 我们的方法基于小行星族演化，这表明在家族V字形内侧应有统计上的逆行自转小行星占主导，在外侧则应有顺行自转小行星占主导。 我们使用了我们观测活动中的光度数据以及文献中的数据，以揭示属于这些家族的小行星的自旋状态。 我们将密集和稀疏光度数据结合起来以构建光变曲线；我们进行了光变曲线反转法来估计多个家族成员的恒星周期、自旋轴和凸形状。 我们为Athor家族成员获得了34个新的小行星模型，为Zita家族成员获得了17个。 结合文献和修订后的模型，Athor家族在内侧有60%的逆行小行星，在外侧有76%的顺行小行星。 我们还发现，Zita家族在外侧有80%的逆行小行星，而在外侧顺行和逆行自转的小行星数量相等。 然而，当我们应用核密度估计时，我们也发现了外侧顺行小行星的一个明显峰值，这与理论预期相符。 这些小行星的自旋状态验证了两个家族的存在，Athor家族分别在外侧和内侧显示出更强烈的顺行和逆行自转小行星的特征。 我们的工作独立地确认并表征了这些非常古老的小行星族，它们的存在和特性为太阳系演化的理论和模型提供了限制条件。 显示英文摘要

摘要： The aim of our study is to characterise the spin states of the members of the Athor and Zita collisional families and test whether these members have a spin distribution consistent with a common origin from the break up of their respective family parent asteroids. Our method is based on the asteroid family evolution, which indicates that there should be a statistical predominance of retrograde-rotating asteroids on the inward side of family's V-shape, and prograde-rotating asteroids on the outward side. We used photometric data from our campaign and the literature in order to reveal the spin states of the asteroids belonging to these families. We combined dense and sparse photometric data in order to construct lightcurves; we performed the lightcurve inversion method to estimate the sidereal period, spin axis and convex shape of several family members. We obtained 34 new asteroid models for Athor family members and 17 for Zita family members. Along with the literature and revised models, the Athor family contains 60% of retrograde asteroids on the inward side and, 76% of prograde asteroids on the outward side. We also found that the Zita family exhibits 80% of retrograde asteroids on the inward side and an equal amount of prograde and retrograde rotators on the outward side. However, when we applied Kernel density estimation, we also found a clear peak for prograde asteroids on the outward side, as expected from the theory. The spin states of these asteroids validate the existence of both families, with the Athor family exhibiting a stronger signature for the presence of retrograde-rotating and prograde-rotating asteroids on the inner and outer side of the family, respectively. Our work provides an independent confirmation and characterisation of these very old families, whose presence and characteristics offer constraints for theories and models of the Solar System's evolution.