arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1608.00962astro-ph.SRastro-ph.HE
收藏

热木星年轻恒星主体的可变射电辐射

Variable Radio Emission from the Young Stellar Host of a Hot Jupiter

Geoffrey C. Bower, Laurent Loinard, Sergio Dzib, Phillip A. B. Galli, Gisela N. Ortiz-León, Claire Moutou, Jean-Francois Donati

摘要:

我们报告发现了与金牛座T星V830 Tau有关的可变无线电发射,最近发现它有一个热木星伴星。在6 GHz频率下的甚大阵列观测揭示了在2011年5月1日探测到的通量密度为$919 \pm 26\ μ$ Jy,以及在$<66$和$<150\ μ$ Jy的另外两个时期没有探测到。此外,甚长基线阵列的观测结果包括在相当灵敏度下的一次检测和一次未检测,表明发射源为非热发射。发射与来自具有磁场${\stackrel{\scriptstyle >}{\scriptstyle \sim}} 30$ G的区域的回旋同步加速器或同步加速器机制一致,并且可能是由诸如加速电子的磁重联之类的高能事件驱动的。由于我们所拥有的数据有限,我们无法对V830 Tau的无线电发射与旋转或轨道性质之间的关系进行任何限制。这是第一次探测到来自已知拥有系外行星的非简并恒星的无线电发射。

英文摘要:

We report the discovery of variable radio emission associated with the T Tauri star, V830 Tau, which was recently shown to host a hot Jupiter companion. Very Large Array observations at a frequency of 6 GHz reveal a detection on 01 May 2011 with a flux density $919 \pm 26\ μ$Jy, along with non-detections in two other epochs at $<66$ and $<150\ μ$Jy. Additionally, Very Long Baseline Array observations include one detection and one non-detection at comparable sensitivity, demonstrating that the emission is nonthermal in origin. The emission is consistent with the gyro-synchrotron or synchrotron mechanism from a region with a magnetic field ${\stackrel{\scriptstyle >}{\scriptstyle \sim}} 30$ G, and is likely driven by an energetic event such as magnetic reconnection that accelerated electrons. With the limited data we have, we are not able to place any constraint on the relationship between the radio emission and the rotational or orbital properties of V830 Tau. This is the first detection of radio emission from a non-degenerate star known to host an exoplanet.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑