磁斑对M/L矮星的转动调制
Rotational Modulation of M/L Dwarfs due to Magnetic Spots
摘要：
我们发现周期性的I波段的变化在两个超冷矮星，TVLM 513-46546和2 MASS J 00361617 +1821104，在M/L矮星边界的两侧。这两个目标都是短周期无线电瞬变，检测到的I波段周期与无线电波长处的周期相匹配（TVLM 513-46546的P=1.96小时，2 MASS J 00361617 +1821104的P=3小时）。我们属性检测到的I-波段周期性的矮星，支持半径估计和测量$v$ sin $i$值的对象的旋转周期。基于检测到的TVLM 513-46546（M9）在I波段的旋转周期，以及从最近的射电观测中确认的强磁场，我们认为磁感应斑点是这种周期性变化的原因。L3.5矮星2 MASS J 00361617 +1821104的I波段旋转调制的幅度随时间变化。我们的结论是，这个对象的I波段的可变性最有可能的原因是磁点，可能再加上时间演变的功能，如尘埃云。
英文摘要：
We find periodic I-band variability in two ultracool dwarfs, TVLM 513-46546 and 2MASS J00361617+1821104, on either side of the M/L dwarf boundary. Both of these targets are short-period radio transients, with the detected I-band periods matching those found at radio wavelengths (P=1.96 hr for TVLM 513-46546, and P=3 hr for 2MASS J00361617+1821104). We attribute the detected I-band periodicities to the periods of rotation of the dwarfs, supported by radius estimates and measured $v$ sin $i$ values for the objects. Based on the detected period of rotation of TVLM 513-46546 (M9) in the I-band, along with confirmation of strong magnetic fields from recent radio observations, we argue for magnetically induced spots as the cause of this periodic variability. The I-band rotational modulation of L3.5 dwarf 2MASS J00361617+1821104 appeared to vary in amplitude with time. We conclude that the most likely cause of the I-band variability for this object is magnetic spots, possibly coupled with time-evolving features such as dust clouds.
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