白矮星诞生踢作为速度空间随机游走. I. Fokker-Planck理论
White Dwarf Natal Kicks as Velocity-Space Random Walks. I. Fokker-Planck Theory
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中文总结 AI 辅助
本文提出Fokker-Planck模型描述白矮星前身星经历多次随机诞生踢对双星轨道的影响，再现观测特征，并探讨其对双星解体、行星系统及星际天体产生的影响。
中文摘要 AI 辅助
白矮星是恒星演化最常见的最终状态，包括我们太阳的最终状态，因此它们的形成对于更全面地理解恒星演化乃至确定太阳系的最终命运至关重要。包含白矮星的宽双星提供了一个强有力的探针：它们的组成部分在很大程度上独立演化，然而恒星质量损失和白矮星前身星上的速度脉冲（诞生踢）会在轨道性质上留下可测量的印记。以往的人口统计研究通常假设每颗白矮星在形成时只接受一次诞生踢。虽然这种假设方便，但这一简化与发现形成过程是间歇性的模拟相冲突。因此，更现实的图景是白矮星前身星在其演化过程中经历多次随机踢。在这里，我们提出了一个Fokker-Planck模型，用于描述在多次、随机取向的质量损失驱动的踢作用下双星轨道参数分布的演化。该模型再现了白矮星双星观测的关键特征，包括间距概率分布中的-2幂律尾，以及超过1000天文单位间距的双星偏心率的热化。我们还研究了白矮星踢如何影响众多其他过程，如双星解体、行星系统演化，甚至星际天体的产生。
英文摘要
White dwarfs are the most common end state of stellar evolution, including that of our own Sun, making their formation critical to completing a more comprehensive understanding of stellar evolution and even determining the eventual fate of the solar system. Wide binaries containing white dwarfs offer a powerful probe: their components evolve largely independently, yet stellar mass loss and velocity impulses (natal kicks) on the white dwarf progenitor leave measurable imprints on orbital properties. Previous population studies typically assume that each white dwarf receives only a single natal kick as it forms. While convenient, this simplification conflicts with simulations finding the formation process to be episodic. Therefore, a more realistic picture is that white-dwarf progenitors experience multiple stochastic kicks over their evolution. Here, we present a Fokker-Planck model for the evolution of binary orbital parameter distributions subject to many, randomly-oriented mass-loss-driven kicks. This model recovers key features of white-dwarf binary observations, including a -2 power law tail in the probability distribution of separations, and the thermalization of binary eccentricities beyond separations of 1000 au. We additionally investigate how white-dwarf kicks impact a myriad of other processes, such as binary dissolution, planetary system evolution, and even the production of interstellar objects.
发表机构
- JILA, University of Colorado and National Institute of Standards and Technology（科罗拉多大学与美国国家标准技术研究院联合JILA实验室）
- Department of Astrophysical and Planetary Sciences, University of Colorado（科罗拉多大学天体物理与行星科学系）
- Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Lagrange（蔚蓝海岸大学、蔚蓝海岸天文台、法国国家科学研究中心拉格朗日实验室）
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