论文标题
新的HST数据和建模揭示了Fomalhaut周围发生的巨大行星碰撞
New HST data and modeling reveal a massive planetesimal collision around Fomalhaut
论文作者
论文摘要
显然发现了旋转福马尔豪斯的外部球星的检测。但是，随后对福马尔豪特B的观察提出了有关其状态的问题：与其他外部外界不同，它在红外线中的光学和非核心是明亮的，它的红外且Orbit似乎在debris环上围绕着debris环，而无需perterational pertitation Pertitations pertitations pertitations pertitations。我们重新访问先前发布的数据并分析其他哈勃太空望远镜（HST）数据，发现该源可能是径向轨迹上的，并且已经褪色并扩展。最近产生的尘埃云的动力学和碰撞建模产生的结果与观察结果一致。 Fomalhaut B似乎是两个大行星系统中两个大行星之间的直接成像的灾难性碰撞。在Fomalhaut时代的静态行星系统中，类似事件应该非常罕见，这表明我们可能正在目睹由于恒星周围假设行星的轨道演变而引起的引力搅拌的影响。
The apparent detection of an exoplanet orbiting Fomalhaut was announced in 2008. However, subsequent observations of Fomalhaut b raised questions about its status: Unlike other exoplanets, it is bright in the optical and nondetected in the infrared, and its orbit appears to cross the debris ring around the star without the expected gravitational perturbations. We revisit previously published data and analyze additional Hubble Space Telescope (HST) data, finding that the source is likely on a radial trajectory and has faded and become extended. Dynamical and collisional modeling of a recently produced dust cloud yields results consistent with the observations. Fomalhaut b appears to be a directly imaged catastrophic collision between two large planetesimals in an extrasolar planetary system. Similar events should be very rare in quiescent planetary systems of the age of Fomalhaut, suggesting that we are possibly witnessing the effects of gravitational stirring due to the orbital evolution of hypothetical planet(s) around the star.
