Monitoring the radio emission of Proxima Centauri

Monitoring the radio emission of Proxima Centauri
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监测比邻星的无线电发射

DOI:
10.1051/0004-6361/202039052
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发表时间:
2020
影响因子:
6.5
通讯作者:
J. Chibueze
J. Chibueze
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
M. P'erez;Jos'e Francisco G'omez;J. Ortiz;P. Leto;G. Anglada;Jos'e Luis G'omez;E. Rodr'iguez;C. Trigilio;P. Amado;A. Alberdi;G. Anglada;M. Osorio;G. Umana;Z. Berdiñas;M. J. L'opez;N. Morales;C. Rodr'iguez;J. Chibueze

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我们展示了对离太阳最近的恒星比邻星进行的最全面的无线电监测活动的结果。我们报告了2017年4月澳大利亚望远镜紧凑型阵列连续18天的1.1-3.1 GHz观测结果。在比邻星的大部分观测时段,我们都探测到了比邻星的射电辐射,它的轨道周期约为比邻星b的1.6个轨道周期。射电辐射在低频波段更强,以1.6 GHz为中心,与已知比邻星磁场强度约为600高斯的预期电子回旋频率一致。1.6 GHz光曲线显示的发射模式与比邻星b围绕比邻星的轨道周期一致,其最大发射发生在正交附近。我们还观察到两次持续时间较短的耀斑(几分钟)和一次持续时间较长的爆发(大约三天),其峰值发生在接近求合点的地方。我们发现,观测到的射电发射的频率、大圆极化程度、圆极化符号的变化和强度都与亚alfv<s:1>星-行星相互作用产生的电子回旋-脉泽发射的预期一致。我们把我们的无线电观测解释为比邻星b和它的主星比邻星之间相互作用的信号。我们主张对其他有行星的矮星进行监测,最终揭示由于恒星-行星相互作用而产生的周期性无线电发射,从而为寻找系外行星和研究系外行星-恒星等离子体相互作用的新领域开辟新的途径。
We present results from the most comprehensive radio monitoring campaign towards the closest star to our Sun, Proxima Centauri. We report 1.1–3.1 GHz observations with the Australia Telescope Compact Array over 18 consecutive days in April 2017. We detected radio emission from Proxima Centauri for most of the observing sessions, which spanned ~1.6 orbital periods of the planet Proxima b. The radio emission is stronger at the low-frequency band, centered around 1.6 GHz, and is consistent with the expected electron-cyclotron frequency for the known star’s magnetic field intensity of ~600 gauss. The 1.6 GHz light curve shows an emission pattern that is consistent with the orbital period of the planet Proxima b around the star Proxima, with its maxima of emission happening near the quadratures. We also observed two short-duration flares (a few minutes) and a long-duration burst (about three days) whose peaks happened close to the quadratures. We find that the frequency, large degree of circular polarization, change in the sign of circular polarization, and intensity of the observed radio emission are all consistent with expectations from electron cyclotron-maser emission arising from sub-Alfvénic star–planet interaction. We interpret our radio observations as signatures of interaction between the planet Proxima b and its host star Proxima. We advocate for monitoring other dwarf stars with planets to eventually reveal periodic radio emission due to star–planet interaction, thus opening a new avenue for exoplanet hunting and the study of a new field of exoplanet–star plasma interaction.
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期刊: The Astrophysical Journal Letters
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影响因子: 6.5
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