AI 中文总结
本研究利用NenuFAR波束形成观测分析HD 189733数据，试探性检测到圆偏振爆发性辐射，虽信号性质有不确定性，但特征似与行星起源相符，强调了波束形成与成像观测对寻找系外行星射电辐射的作用。
AI 中文摘要
观测极光射电辐射是探测系外行星磁场的最有前景的方法之一，这能为行星内部、大气特性和潜在宜居性提供有价值的见解。系外行星极光发射的初步迹象开始显现。最近，Zhang等人（2025年）报告了使用NenuFAR低频成像观测在50 MHz处检测到HD 189733系外行星系统的圆偏振爆发性辐射。辐射源仍未知，可能由行星极光发射、恒星 - 行星相互作用、恒星活动或M矮星伴星引起。在本研究中，我们分析了NenuFAR在先前检测到爆发期间同时获取的HD 189733的波束形成观测数据。该数据集允许使用不同后端和处理步骤对检测到的爆发进行独立验证。使用BOREALIS数据缩减管道，我们在成像观测发现的爆发前约1小时试探性地检测到HD 189733的圆偏振爆发性辐射（约10σ）。然而，由于相关噪声过多，我们检测到的信号是否为天体物理信号仍存在一些不确定性。假设是天体物理起源，我们观测到的特征最符合行星起源，但恒星发射不能完全排除。因此，需要更多低频射电观测来确认信号的天体物理性质，并在HD 189733的射电信号中寻找周期性以确定辐射的真正原因。这些观测正在进行。我们的研究突出了同时进行波束形成和成像观测在寻找系外行星射电辐射方面的作用。
英文摘要
Observing auroral radio emission is one of the most promising methods for detecting exoplanetary magnetic fields, which provide valuable insights into planetary interiors, atmospheric properties, and potential habitability. The first hints of exoplanet auroral emission are starting to emerge. Recently, Zhang et al. (2025) reported a detection at 50 MHz of a circularly polarized bursty emission from the HD 189733 exoplanetary system using NenuFAR low-frequency imaging observations. The source of the emission is still unknown and may be caused by planetary auroral emissions, star-planet interactions, stellar activity, or the M-dwarf stellar companion. In this study, we analyze beamformed observations from NenuFAR of HD 189733 taken simultaneously during the previously detected burst. This dataset allows for an independent verification of the detected burst with a different backend and processing steps. Using the BOREALIS data reduction pipeline, we tentatively detect circularly polarized bursty emission ($\sim$10$σ$) from HD 189733 $\sim$1 hour before the burst found from the imaging observations. However, some uncertainty remains on whether our detected signal is astrophysical in nature due to excess correlated noise. Assuming an astrophysical origin, our observed characteristics are most consistent with a planetary origin, but stellar emission cannot be completely ruled. Therefore, more low-frequency radio observations are needed to confirm the astrophysical nature of our signal and to search for periodicity in the radio signal from HD 189733 to determine the true cause of the emission. These observations are ongoing. Our study highlights the power of simultaneous beamformed and imaging observations in the search for radio emission from exoplanets.
Comments10 pages, 2 figures 3 tables, 1 Appendix. Accepted for publication (June 30, 2026) for the Planetary, Solar, and Heliospheric Radio Emissions X Proceedings. Refereed by 2 referees
