T6矮星WISEPC J112254 .73+255021.5的射电耀斑及其可能的超短周期
Radio Flaring from the T6 Dwarf WISEPC J112254.73+255021.5 with A Possible Ultra-short Periodicity
摘要：
我们提出了新的结果，从一个持续的5 GHz的搜索耀斑无线电发射的样本的L和T褐矮星，进行与305米阿雷西博射电望远镜。除了先前报道的来自T6.5矮星2 MASS J10475385+212423的耀斑外，我们还检测并确认了来自另一个T6矮星WISEPC J112254.73+255021.5的圆偏振耀斑。虽然耀斑是零星的，但它们似乎以0.288小时的稳定周期发生。考虑到电流限制，不能排除等于其第二和第三次谐波的周期。在8个月的观测时间跨度内，这段时间的稳定性表明，如果这是真的，它可能反映了恒星的快速旋转。如果得到证实，这三个推断的周期中的任何一个都将比迄今为止测量的褐矮星最短的1.41小时自转周期短得多。这一发现将对亚恒星物体的角动量演化和旋转稳定性提出新的观测约束。对第六颗~1000 K矮星的射电辐射的探测进一步表明，最冷的褐矮星和可能的年轻巨行星可以利用厘米波长的射电观测作为工具进行有效的研究。
英文摘要：
We present new results from a continuing 5 GHz search for flaring radio emission from a sample of L and T brown dwarfs, conducted with the 305-m Arecibo radio telescope. In addition to the previously reported flaring from the T6.5-dwarf 2MASS J10475385+212423, we have detected and confirmed circularly polarized flares from another T6-dwarf, WISEPC J112254.73+255021.5. Although the flares are sporadic, they appear to occur at a stable period of 0.288 hours. Given the current constraints, periods equal to its second and third subharmonic cannot be ruled out. The stability of this period over the 8-month timespan of observations indicates that, if real, it likely reflects the star's rapid rotation. If confirmed, any of the three inferred periodicities would be much shorter than the shortest, 1.41-hour rotation period of a brown dwarf measured so far. This finding would place a new observational constraint on the angular momentum evolution and rotational stability of substellar objects. The detection of radio emission from the sixth ~1000 K dwarf further demonstrates that the coolest brown dwarfs and, possibly, young giant planets, can be efficiently investigated using radio observations at centimeter wavelengths as a tool.
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