论文标题
Kozai迁移自然解释了白色矮人星球WD1856B
Kozai Migration Naturally Explains the White Dwarf Planet WD1856b
论文作者
论文摘要
Jovian大小的对象WD〜1856〜B以紧凑型$ 1.4 $ -DAY ORBIT的白色矮人（WD）过渡。 WD〜1856〜B不太可能在其当前轨道上忍受了恒星的演变，被认为是从更广泛的分离中迁移的。由于WD是旧的，并且是特征良好的分层倍数的成员，因此著名的Kozai机制为WD 〜1856〜b提供了有效的迁移通道。此外，恒星中缺乏潮汐使我们能够将当前的半束轴直接连接到前移民轴，我们可以从中推断系统的初始条件。通过进一步要求成功的迁移者在恒星进化的所有先前阶段中幸存下来，我们能够将WD〜1856〜b的质量限制为$ \ simeq0.7-3m _ {\ rm J} $及其主要序列半轴轴，为$ \ simeq 2-2-2.5 $ au。这些特性暗示WD〜1856〜B诞生了典型的气体巨头。我们进一步估计WD周围的Kozai移民行星的发生率为$ {\ cal O}（10^{ - 3} { - } { - } 10^{ - 4}）$，这表明WD〜1856〜b表明{\ it tess}样品中唯一的一个，但暗示了$} $} $} $}（^2）（10^2）。从某种意义上说，WD〜1856〜B是一个普通的Jovian星球，经历了非凡的动态历史。
The Jovian-sized object WD~1856~b transits a white dwarf (WD) in a compact $1.4$-day orbit. Unlikely to have endured stellar evolution in its current orbit, WD~1856~b is thought to have migrated from much wider separations. Because the WD is old, and a member of a well-characterized hierarchical multiple, the well-known Kozai mechanism provides an effective migration channel for WD~1856~b. Moreover, the lack of tides in the star allows us to directly connect the current semi-major axis to the pre-migration one, from which we can infer the initial conditions of the system. By further demanding that successful migrators survive all previous phases of stellar evolution, we are able to constrain the mass of WD~1856~b to be $\simeq0.7-3M_{\rm J}$ and its main sequence semi-major axis to be $\simeq 2-2.5$ au. These properties imply that WD~1856~b was born a typical gas giant. We further estimate the occurrence rate of Kozai-migrated planets around WDs to be ${\cal O}(10^{-3}{-}10^{-4})$, suggesting that WD~1856~b is the only one in the {\it TESS} sample, but implying ${\cal O}(10^2)$ future detections by LSST. In a sense, WD~1856~b was an ordinary Jovian planet that underwent an extraordinary dynamical history.
