利用APOLLO搜索前主序星中的类太阳振荡
Searching for solar-like oscillations in pre-main sequence stars using APOLLO
摘要：
近年来，由于从太空望远镜收集的原始数据，我们对从主序星到红巨星的类太阳振荡的理解有了显着提高。剩下的一个悬而未决的问题集中在观测识别前主序星中的类太阳振荡。我们的目标是开发一种改进的方法来搜索前主序星中的类太阳振荡，并将其应用于开普勒K2任务收集的数据。我们的软件APOLLO包括一种新的方法来检测低信噪比太阳般的振荡在一个高的背景水平的存在。通过校准我们的方法，使用已知的类太阳振荡器的主要开普勒任务，我们将其应用到T金牛星观测开普勒K2，并确定几个候选人的主序前类太阳振荡器。我们发现，我们的方法是强大的，即使当应用到时间序列的观测长度一样短的TESS卫星在一个部门。我们确定EPIC 205375290作为一个可能的候选人，在一个主序前恒星与$ν_\mathrm{max} \simeq 242\,μ$ Hz的类太阳振荡。我们还得出EPIC 205375290的基本参数是$T_\mathrm{eff}$ = 3670 $\pm$ 180 K，日志$g$ = 3.85 $\pm$ 0.3，$v$ sin $i$ = 8 $\pm$ 1 km s $^{-1}$，和太阳金属丰度从高分辨率光谱从凯克档案。
英文摘要：
In recent years, our understanding of solar-like oscillations from main sequence to red giant stars has improved dramatically thanks to pristine data collected from space telescopes. One of the remaining open questions focuses around the observational identification of solar-like oscillations in pre-main sequence stars. We aim to develop an improved method to search for solar-like oscillations in pre-main sequence stars and apply it to data collected by the Kepler K2 mission. Our software APOLLO includes a novel way to detect low signal-to-noise ratio solar like oscillations in the presence of a high background level. By calibrating our method using known solar-like oscillators from the main Kepler mission, we apply it to T Tauri stars observed by Kepler K2 and identify several candidate pre-main sequence solar-like oscillators. We find that our method is robust even when applied to time-series of observational lengths as short as those obtained with the TESS satellite in one sector. We identify EPIC 205375290 as a possible candidate for solar-like oscillations in a pre-main sequence star with $ν_\mathrm{max} \simeq 242\,μ$Hz. We also derive EPIC 205375290's fundamental parameters to be $T_\mathrm{eff}$ = 3670$\pm$180 K, log $g$ = 3.85$\pm$0.3, $v$sin$i$ = 8 $\pm$ 1 km s$^{-1}$, and about solar metallicity from a high-resolution spectrum obtained from the Keck archive.
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