标题： 白矮星作为系外行星成分和基本天体物理学的探针 显示英文标题

标题： White dwarfs as probes of extrasolar planet compositions and fundamental astrophysics

摘要： 白矮星代表恒星演化的最常见的最终阶段，并且对于一系列天体物理问题非常重要。 宜居世界观测台（HWO）的高分辨率紫外线光谱能力提供了独特的特性来表征白矮星。 在本文中，我们关注HWO的两个具体科学案例——白矮星作为太阳系外行星成分的探针，以及基本天体物理学。 HWO将具有灵敏度，在大量污染的白矮星中测量一系列重元素，如S、C、O、Fe和Si，以限制太阳系外行星核心中的水含量和轻元素。 HWO还可以用来在强引力存在的情况下搜索精细结构常数的任何微小变化。 这两个科学案例都需要最小的分辨率功率为60,000，并且紫外线覆盖范围至少达到900埃。 显示英文摘要

摘要： White dwarfs represent the most common end stage of stellar evolution and are important for a range of astrophysical questions. The high-resolution ultraviolet spectroscopic capability of the Habitable World Observatory (HWO) offers a unique capability to characterize white dwarfs. In this documents, we focus on two specific science cases for HWO -- white dwarfs as probes of extrasolar planet compositions, and fundamental astrophysics. HWO will have the sensitivity to measure a suite of heavy elements, such as S, C, O, Fe, and Si, in a large sample of polluted white dwarfs to constrain the water content and the light elements in the cores of extrasolar planets. HWO can also be used to search for any small variation on the fine structure constant in the presence of strong gravity. Both science cases require a minimum resolving power of 60,000, and a ultraviolet coverage down to at least 900 Angstrom.