千新星at2017gfo中的碲发射谱线

Q1 Earth and Planetary Sciences Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-08-09 DOI:10.1093/mnrasl/slad128
Kenta Hotokezaka, Masaomi Tanaka, Daiji Kato, Gediminas Gaigalas
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引用次数: 2

摘要

与GW170817相关的千新星AT 2017gfo的晚时光谱在$2.1\,{\rm \mu m}$处表现出强烈的发射谱线特征。谱线结构随时间发展,光谱中没有蓝移吸收特征,表明这种发射谱线特征是由电子碰撞激发产生的。我们将发射线归因于碲(Te) III的精细结构线,它是第二个r过程峰中最丰富的元素之一。通过一个包含太阳r过程丰度模式超过第一个r过程峰(即原子质量数a > 88)的精细结构发射谱线的合成光谱模型,我们证明了[Te iii] $2.10\, \rm \mu m$确实是近红外区域最强的发射谱线。我们估计teiii的所需质量为~ 10−3 M⊙,对应于0.05 M⊙的合并抛射,这与从千新星光曲线估计的质量一致。
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Tellurium emission line in kilonova AT 2017gfo
ABSTRACT The late-time spectra of the kilonova AT 2017gfo associated with GW170817 exhibit a strong emission line feature at $2.1\, {\rm \mu m}$. The line structure develops with time and there is no blueshifted absorption feature in the spectra, suggesting that this emission line feature is produced by electron collision excitation. We attribute the emission line to a fine structure line of Tellurium (Te) III, which is one of the most abundant elements in the second r-process peak. By using a synthetic spectral modelling including fine structure emission lines with the solar r-process abundance pattern beyond the first r-process peak, i.e. atomic mass numbers A ≳ 88, we demonstrate that [Te iii] $2.10\, \rm \mu m$ is indeed expected to be the strongest emission line in the near infrared region. We estimate that the required mass of Te iii is ∼10−3 M⊙, corresponding to the merger ejecta of 0.05 M⊙, which is in agreement with the mass estimated from the kilonova light curve.
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来源期刊
Monthly Notices of the Royal Astronomical Society: Letters
Monthly Notices of the Royal Astronomical Society: Letters Earth and Planetary Sciences-Space and Planetary Science
CiteScore
8.80
自引率
0.00%
发文量
136
期刊介绍: For papers that merit urgent publication, MNRAS Letters, the online section of Monthly Notices of the Royal Astronomical Society, publishes short, topical and significant research in all fields of astronomy. Letters should be self-contained and describe the results of an original study whose rapid publication might be expected to have a significant influence on the subsequent development of research in the associated subject area. The 5-page limit must be respected. Authors are required to state their reasons for seeking publication in the form of a Letter when submitting their manuscript.
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