论文标题
轨道动力学中的磁相互作用
Magnetic interactions in orbital dynamics
论文作者
论文摘要
如果轨道体本身是磁性或电导的，则宿主恒星的磁场会影响恒星伴侣，行星或小行星的轨道。在这里，我们将重点放在极限上的轨道体上的瞬时磁力上，其中偶极近似描述了其磁性特性以及其恒星宿主的磁性特性。如果磁力与偶极 - 偶极相互作用的陡峭径向依赖性相当，则大约恒星中的永久磁铁将不可避免地朝恒星宿主伸向恒星宿主。虽然观察到的系统中的磁场太弱而无法推动合并事件，但我们确认它们在一些紧凑的二进制中可能足够高，以引起可测量的轨道进动。当轨道体是导体时，恒星场会诱导随时间变化的磁偶极矩，从而导致偏心泵的可能性和共振陷阱。挑战是轨道必须靠近恒星宿主，因此磁相互作用必须与潮汐力竞争以及强烈的恒星辐射的影响。
The magnetic field of a host star can impact the orbit of a stellar partner, planet, or asteroid if the orbiting body is itself magnetic or electrically conducting. Here, we focus on the instantaneous magnetic forces on an orbiting body in the limit where the dipole approximation describes its magnetic properties as well as those of its stellar host. A permanent magnet in orbit about a star will be inexorably drawn toward the stellar host if the magnetic force is comparable to gravity due to the steep radial dependence of the dipole-dipole interaction. While magnetic fields in observed systems are much too weak to drive a merger event, we confirm that they may be high enough in some close compact binaries to cause measurable orbital precession. When the orbiting body is a conductor, the stellar field induces a time-varying magnetic dipole moment that leads to the possibility of eccentricity pumping and resonance trapping. The challenge is that the orbiter must be close to the stellar host, so that magnetic interactions must compete with tidal forces and the effects of intense stellar radiation.
