VO谱线表的定量评估：不准确性阻碍了系外行星大气中高分辨率VO探测
A quantitative assessment of the VO line list: Inaccuracies hamper high-resolution VO detections in exoplanet atmospheres
AI总结：
本文定量评估VO谱线表不准确性对WASP-121b高分辨率VO探测的影响，发现完整谱线表使信号被抑制约2.1倍，而仅保留最准确量子跃迁的简化谱线表可将抑制降至1.1倍并提升信号恢复能力约1.8倍，但两种谱线表均无法在现有数据中实现VO探测。
摘要：
金属氢化物和氧化物是热木星中的重要物种，因为它们能够影响热木星的能量收支及其大气热结构。VO就是其中之一，它在M矮星光谱中十分显著。在WASP-121b的低分辨率透射光谱中已经发现了VO存在的证据，但这一结果尚未在高分辨率下得到确认。有观点认为，这可能是由于其谱线表不准确所致。本文对VO谱线表进行了定量评估，并考察了这种不准确性是否是导致WASP-121b高分辨率探测未获成功的原因。此外，我们还研究了仅选取与最准确量子跃迁相关的谱线是否能够提高可探测性。对若干M矮星的HARPS和CARMENES档案光谱进行了交叉相关分析。将来自光谱的VO交叉相关信号与注入了合成VO模型的信号进行比较，从而估计潜在强度（在模型完美的情况下）与观测到的信号强度之间的比值。对覆盖最准确量子跃迁的简化模型重复了这一过程。这些结果被用于WASP-121b的UVES透射光谱中VO的注入与回收测试。我们发现，对于完整谱线表和简化谱线表，不准确性分别使M矮星光谱中的VO交叉相关信号被抑制约2.1倍和1.1倍，对应的观测效率分别降低4.3倍和1.2倍。在恢复M矮星光谱中的实际VO信号方面，简化谱线表比完整谱线表表现好约1.8倍。两种谱线表均未能在WASP-121b中实现VO探测。注入测试表明，考虑到谱线表降低后的效率，在低分辨率下看到的潜在信号在这些数据中无法被探测到。
英文摘要：
Metal hydrides and oxides are important species in hot-Jupiters since they can affect their energy budgets and the thermal structure of their atmospheres. One such species is VO, which is prominent in stellar M-dwarf spectra. Evidence for VO has been found in the low-resolution transmission spectrum of WASP-121b, but this has not been confirmed at high resolution. It has been suggested that this is due to inaccuracies in its line list. In this paper, we quantitatively evaluate the VO line list and assess whether inaccuracies are responsible for the non-detections at high resolution in WASP-121b. Furthermore, we investigate whether the detectability can be improved by selecting only those lines associated with the most accurate quantum transitions. A cross-correlation analysis was applied to archival HARPS and CARMENES spectra of several M dwarfs. VO cross-correlation signals from the spectra were compared with those in which synthetic VO models were injected, providing an estimate of the ratio between the potential strength (in case of a perfect model) and the observed strength of the signal. This was repeated for the reduced model covering the most accurate quantum transitions. The findings were fed into injection and recovery tests of VO in a UVES transmission spectrum of WASP-121b. We find that inaccuracies cause VO cross-correlation signals in M-dwarf spectra to be suppressed by about a factor 2.1 and 1.1 for the complete and reduced line lists, respectively, corresponding to a reduced observing efficiency of a factor 4.3 and 1.2. The reduced line list outperforms the complete line list in recovering the actual VO signal in the M-dwarf spectra by about a factor of 1.8. Neither line list results in a VO detection in WASP-121b. Injection tests show that with the reduced efficiency of the line lists, the potential signal as seen at low resolution is not detectable in these data.
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