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arXiv 2108.03577astro-ph.HE
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波江座新星KT爆发的Chandra观测

Chandra observations of nova KT Eridani in outburst

Songpeng Pei, Marina Orio, Jan-Uwe Ness, Nataly Ospina

摘要:

我们在这里分析了2010年用钱德拉高分辨率相机光谱仪(HRC-S)和低能透射光栅(LETG)对新星KT Eri(Nova Eri 2009)的四次观测,从光学极大值后的第71天到第159天,在发光的超软X射线阶段。光谱呈现出许多吸收特征,速度范围很大,在同一观测中从几百km s $^{-1}$到3100 km s $^{-1}$,还有一些突出的发射特征,通常红移超过2000 km s $^{-1}$。虽然距离和WD光度的不确定性,从近似拟合不允许我们排除一个更大的绝对光度比我们的最佳估计的$\simeq 5 \times 10^{37}$ erg的$^{-1}$,它很可能是我们只观察到高达$\simeq$ 40%的表面的白矮星,这可能是部分隐藏的clusianesejects。我们与大气模型的拟合表明,在1.15-1.25 M $_\odot$范围内有一颗巨大的白矮星。喷出物产生的热光谱似乎叠加在白矮星的光谱上。它是复杂的,有一个以上的组成部分,并可能是由于混合物的光电离和冲击电离流出的材料。我们确认,$\simeq$ 35秒振荡,这是早些时候报道,在最后一次观察中检测到的,在第159天的爆发。

英文摘要:

We analyse here four observations of nova KT Eri (Nova Eri 2009) done with the Chandra High Resolution Camera Spectrometer (HRC-S) and the Low Energy Transmission Grating (LETG) in 2010, from day 71 until day 159 after the optical maximum, in the luminous supersoft X-ray phase. The spectrum presents many absorption features with a large range of velocity, from a few hundred km s$^{-1}$ to 3100 km s$^{-1}$ in the same observation, and a few prominent emission features, generally redshifted by more than 2000 km s$^{-1}$. Although the uncertainty on the distance and the WD luminosity from the approximate fit do not let us rule out a larger absolute luminosity than our best estimate of $\simeq 5 \times 10^{37}$ erg s$^{-1}$, it is likely that we observed only up to $\simeq$40% of the surface of the white dwarf, which may have been partially hidden by clumpy ejecta. Our fit with atmospheric models indicate a massive white dwarf in the 1.15-1.25 M$_\odot$ range. A thermal spectrum originating in the ejecta appears to be superimposed on the white dwarf spectrum. It is complex, has more than one component and may be due to a mixture of photoionized and shock ionized outflowing material. We confirm that the $\simeq$35 s oscillation that was reported earlier, was detected in the last observation, done on day 159 of the outburst.

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