荷兰射电天文学研究所Ekaterina Ilin团队揭示了近距离行星在其主星上引起耀斑。2025年7月2日，《自然》杂志发表了这一成果。

在过去的十年中，数百颗系外行星被发现在10天以内的极短轨道上运行。与太阳系不同，这些系统中的行星围绕其主星运行的距离足够近，足以干扰恒星磁场线。这种相互作用可以增强恒星的磁性活动，如色球和无线电发射或燃烧。到目前为止，对磁性恒星-行星相互作用的研究还没有定论。 

研究组报告了在HIP 67522上探测到行星引起的耀斑，HIP 67222是一颗1700万年前的G矮星，有两颗已知的近地行星。结合超过5年的凌日系外行星测量卫星的星载光度测量和专门的系外行星特征望远镜观测，他们发现HIP 67522星团中的15次耀斑靠近最内层行星的凌日阶段，表明该系统中存在持续的磁星行星相互作用。相互作用的稳定性意味着，最内层的行星持续自身造成的耀斑速率是没有相互作用时的六倍。随后高能辐射和粒子轰击HIP 67522 b的通量可能解释了最近詹姆斯·韦伯太空望远镜探测到的这颗行星大气层的显著扩展。因此，HIP 67522是了解磁性恒星-行星相互作用对新生系外行星大气影响的原型。

附：英文原文

Title: Close-in planet induces flares on its host star

Author: Ilin, Ekaterina, Vedantham, Harish K., Poppenhger, Katja, Bloot, Sanne, Callingham, Joseph R., Brandeker, Alexis, Chakraborty, Hritam

Issue&Volume: 2025-07-02

Abstract: In the past decade, hundreds of exoplanets have been discovered in extremely short orbits below 10days. Unlike in the Solar System, planets in these systems orbit their host stars close enough to disturb the stellar magnetic field lines1. The interaction can enhance the magnetic activity of the star, such as its chromospheric2 and radio3 emission or flaring4. So far, the search for magnetic star–planet interactions has remained inconclusive. Here we report the detection of planet-induced flares on HIP 67522, a 17 million-year-old G dwarf star with two known close-in planets5,6. Combining space-borne photometry from the Transiting Exoplanet Survey Satellite and dedicated Characterising Exoplanets Telescope observations over 5years, we find that the 15 flares in HIP 67522 cluster near the transit phase of the innermost planet, indicating persistent magnetic star–planet interaction in the system. The stability of interaction implies that the innermost planet is continuously self-inflicting a six times higher flare rate than it would experience without interaction. The subsequent flux of energetic radiation and particles bombarding HIP 67522 b may explain the remarkably extended atmosphere of the planet, recently detected with the James Webb Space Telescope7. HIP 67522 is, therefore, an archetype to understand the impact of magnetic star–planet interaction on the atmospheres of nascent exoplanets.

DOI: 10.1038/s41586-025-09236-z

Source: https://www.nature.com/articles/s41586-025-09236-z