标题： 斯皮策白矮星红外超额巡天 显示英文标题

标题： Spitzer Surveys of IR Excesses of White Dwarfs

摘要： 白矮星 (WDs) 的红外过量可用于诊断低质量伴星、行星和周围恒星尘埃的存在。利用不同波长组合和白矮星温度，可以探测不同半径处的周围恒星尘埃盘。斯皮策空间望远镜已被用于搜索白矮星的红外过量。发现了两种类型的周围恒星尘埃盘：(1) 在有效温度 Teff < 20,000 K 的冷白矮星周围的较小尘埃盘，以及 (2) 在有效温度 Teff > 100,000 K 的热白矮星周围的较大尘埃盘。小尘埃盘位于洛希极限内，通常认为是由潮汐粉碎的小行星形成的。较大的尘埃盘距离其中央白矮星数十个天文单位，被认为是由柯伊伯带类天体之间的碰撞增加引起的。本文讨论了围绕冷白矮星的小尘埃盘的斯皮策 IRAC 巡天、围绕热白矮星的大尘埃盘的 MIPS 巡天，以及白矮星红外过量的存档斯皮策巡天。 显示英文摘要

摘要： IR excesses of white dwarfs (WDs) can be used to diagnose the presence of low-mass companions, planets, and circumstellar dust. Using different combinations of wavelengths and WD temperatures, circumstellar dust at different radial distances can be surveyed. The Spitzer Space Telescope has been used to search for IR excesses of white dwarfs. Two types of circumstellar dust disks have been found: (1) small disks around cool WDs with Teff < 20,000 K, and (2) large disks around hot WDs with Teff > 100,000 K. The small dust disks are within the Roche limit, and are commonly accepted to have originated from tidally crushed asteroids. The large dust disks, at tens of AU from the central WDs, have been suggested to be produced by increased collisions among Kuiper Belt-like objects. In this paper, we discuss Spitzer IRAC surveys of small dust disks around cool WDs, a MIPS survey of large dust disks around hot WDs, and an archival Spitzer survey of IR excesses of WDs.