标题： 已知系外行星系统的宜居带中类地行星的轨道 显示英文标题

标题： The Orbits of Terrestrial Planets in the Habitable Zones of Known Exoplanetary Systems

摘要： 我们表明类地行星可以在47 Ursae Majoris、Epsilon Eridani和Rho Coronae Borealis的宜居带的不同受限区域内幸存下来，但在Gliese 876和Upsilon Andromedae的宜居带内无一能够存在。这前三个系统代表了截至2002年中期发现的大约90个太阳系外行星系统的很大一部分，因此有许多已知系统值得在宜居带内寻找类地行星。我们通过在各种轨道上发射假想的质量与地球相同的行星，并使用混合变量辛积分器跟踪它们的命运来得出结论。 显示英文摘要

摘要： We show that terrestrial planets could survive in variously restricted regions of the habitable zones of 47 Ursae Majoris, Epsilon Eridani, and Rho Coronae Borealis, but nowhere in the habitable zones of Gliese 876 and Upsilon Andromedae. The first three systems between them are representative of a large proportion of the 90 or so extrasolar planetary systems discovered by mid-2002, and thus there are many known systems worth searching for terrestrial planets in habitable zones. We reach our conclusions by launching putative Earth-mass planets in various orbits and following their fate with a mixed-variable symplectic integrator.