近日,西班牙最高科学调查委员会D. Revilla团队报道了利用恒星与行星的相互作用来限制系外行星的磁场。2026年6月25日,《科学》杂志发表了这一成果。
理论预测,一颗拥有足够强磁场的行星若紧密绕其宿主恒星运行,则可能引发恒星-行星磁相互作用。这种作用可能表现为与行星轨道周期同步的光学或射电恒星活动信号。
研究组分析了GJ 436(一颗低质量恒星,被一颗海王星大小的系外行星沿极地偏心轨道绕行)长达18年的高分辨率光学光谱数据。恒星活动指示器显示出在对应系外行星轨道的周期上出现增强,并受到恒星自转以及恒星8年磁周期的调制。研究组将此解释为恒星-行星磁相互作用的信号。通过几何模型,他们再现了这些周期,如果GJ 436 b的磁场强度为6至110高斯的话。
附:英文原文
Title: Constraining an exoplanet’s magnetic field using star-planet interactions
Author: D. Revilla, P. J. Amado, R. Luque, P. Schfer, A. F. Lanza, A. Binnenfeld, J. A. Caballero, A. P. Hatzes, G. W. Henry, S. V. Jeffers, S. Kaur, E. Pallé, L. Pea-Moino, M. Pérez-Torres, A. Quirrenbach, A. Reiners, I. Ribas, D. Viganò, M. R. Zapatero-Osorio, S. Zucker
Issue&Volume: 2026-06-25
Abstract: Theory predicts that a planet with a sufficiently strong magnetic field orbiting close to its host star could induce star-planet magnetic interactions. This is potentially observable as an optical or radio stellar activity signal synchronised with the planet’s orbital period. We analyze 18 years of high-resolution optical spectroscopy of GJ 436, a low mass star orbited by a Neptune-sized exoplanet on a polar eccentric orbit. Stellar activity indicators show enhancements at a period corresponding to the exoplanet orbit, modulated by stellar rotation, and the star’s 8-year magnetic cycle. We interpret this as a signal of star-planet magnetic interaction. Using a geometric model, we reproduce these periods if GJ 436 b has a magnetic field strength of 6 to 110 Gauss.
DOI: adv3075
Source: https://www.science.org/doi/10.1126/science.adv3075
期刊信息
Science:《科学》,创刊于1880年。隶属于美国科学促进会,最新IF:63.714
官方网址:https://www.sciencemag.org/
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