标题： 使用STEPS发现M矮星伴星 显示英文标题

标题： Discovering M-Dwarf Companions with STEPS

摘要： 星系行星巡天（STEPS）是一项正在进行的针对约30颗M型矮星周围巨型行星和褐矮星的视向测量搜寻。 通过测量目标恒星相对于参考框架的运动，我们已经发现了多个低质量伴星。 我们描述了STEPS用于恒星质心测定的方法，这使我们的相对天体力学测量精度达到约1毫角秒。 我们描述了其中一个通过天体力学方法发现的伴星GJ 1210B，后来该伴星通过成像观测得到了确认。 根据它们的光度、推断的质量和颜色，GJ 1210 A和B的光谱类型为M4-5。 显示英文摘要

摘要： The Stellar Planet Survey (STEPS) is an ongoing astrometric search for giant planets and brown dwarfs around a sample of ~30 M-dwarfs. We have discovered several low-mass companions by measuring the motion of our target stars relative to their reference frames. We describe the STEPS method for stellar centroiding that enables our ~1 milliarcsecond relative astrometry. We describe one of the astrometrically discovered companions, GJ 1210B, which was later confirmed with an imaging observation. GJ 1210 A and B have spectral types M4-5, based on their luminosities, inferred masses, and colors.