标题： 在HD 131399三合星系统中围绕A型恒星运行的行星的不稳定命运 显示英文标题

标题： The unstable fate of the planet orbiting the A-star in the HD 131399 triple stellar system

摘要： 验证过的行星候选体不一定位于长期稳定的轨道上，由主序后恒星演化引发的不稳定可以产生将岩石物质传输到白矮星的结构，从而污染它们。 巨行星 HD 131399Ab 以大约 50-100 天文单位的投影距离围绕其母恒星 A 星运行。 宿主恒星 HD 131399A 是一个分层三合星系统的一部分，HD 131399BC 是一个与 A 星相距几百天文单位的密近双星。 在这里，我们确定了这个系统的命运，并发现（i）在误差范围内只有参数的有利选择才能实现主序星阶段的稳定性，以及（ii）即使对于这种选择，在几乎所有情况下，行星都会在 HD 131399A 从红巨星分支过渡到白矮星阶段期间被抛出。 这一结果提供了一个例子，说明类似系统如何可能增强自由漂浮行星种群，以及不稳定性如何在污染白矮星前体种群中表现出来。 显示英文摘要

摘要： Validated planet candidates need not lie on long-term stable orbits, and instability triggered by post-main-sequence stellar evolution can generate architectures which transport rocky material to white dwarfs, polluting them. The giant planet HD 131399Ab orbits its parent A star at a projected separation of about 50-100 au. The host star, HD 131399A, is part of a hierarchical triple with HD 131399BC being a close binary separated by a few hundred au from the A star. Here, we determine the fate of this system, and find that (i) stability along the main sequence is achieved only for a favourable choice of parameters within the errors, and (ii) even for this choice, in almost every instance the planet is ejected during the transition between the giant branch and white dwarf phases of HD 131399A. This result provides an example of both how the free-floating planet population may be enhanced by similar systems, and how instability can manifest in the polluted white dwarf progenitor population.