AI 中文总结
研究利用平方公里阵列，有望首次探测强磁场巨型系外行星的射电发射，探测数百秒差距内数千个超冷矮星，结合甚长基线干涉测量，通过天体测量监测探测围绕射电发射超冷矮星的地球质量行星，为系外行星形成和演化研究打开新窗口。
AI 中文摘要
太阳系中的大多数行星都是明亮的射电发射源，由被困在行星磁场中的高能电子驱动。探测来自系外行星的这种发射为表征其磁场提供了独特机会，这对确定系外行星的大气演化至关重要。然而，由于低频射电缺乏灵敏度，尚未确凿探测到系外行星的射电发射。超冷矮星（UCDs）已被探测到类似行星的射电信号二十多年，其大小与木星相当但质量更大，内部结构与木星类似，是研究行星尺度磁场表现的理想目标。本文概述平方公里阵列在系外行星和UCDs研究中的变革性作用，预计它将促成对强磁场巨型系外行星射电发射的首次探测，在几百秒差距内探测到数千个UCDs，结合甚长基线干涉测量，天体测量监测将能探测到围绕附近射电发射UCDs运行的几地球质量的行星，这些发现将为太阳系外行星的形成和演化打开新窗口。
英文摘要
The majority of the Solar System planets are sources of bright radio emission, driven by energetic electrons trapped within each planet's magnetic field. Detection of this emission from exoplanets provides a unique opportunity to characterise their magnetic fields, which is key to determining the atmospheric evolution of exoplanets. However, a conclusive detection of radio emission from an exoplanet remains at large, primarily due to a lack of sensitivity at low radio frequencies. On the other hand, planet-like radio signatures have been detected on objects called ultracool dwarfs (UCDs) for over two decades. UCDs are of comparable sizes to Jupiter, but are more massive. They also possess similar interior structures to Jupiter, the region where magnetic fields are generated. Therefore, UCDs are ideal targets to study to advance our understanding of how magnetic fields manifest at planetary scales. In this Chapter, we outline the revolutionary role that the Square Kilometre Array will play in the study of exoplanets and UCDs. We anticipate that it will facilitate the first detection of radio emission from giant exoplanets with strong magnetic fields, and will deliver thousands of detections of UCDs within a few hundred parsecs. Combined with very long baseline interferometry, we also expect that astrometric monitoring will enable the detection of planets of a few Earth masses orbiting nearby radio-emitting UCDs. These findings will open a new window into how planets form and evolve in extrasolar systems.
CommentsPublished in Advancing Astrophysics with the SKA II (AASKAII), 2026 (arXiv:2606.20366). Report-no:AASKAII/Kavanagh01. Advancing Astrophysics with the SKA II (AASKAII) outlines the transformative scientific advances that will be enabled by the SKA telescopes
