论文标题
2019年出色的仿生揭示了冥王星大气压的迅速降低的证据
Evidence for a rapid decrease in Pluto's atmospheric pressure revealed by a stellar occultation in 2019
论文作者
论文摘要
我们报告了Pluto在2019年7月17日对出色的掩星的观察结果。使用安装在Toohoku University 60 cm望远镜上的CMOS摄像头（Haleakala）（Haleakala，Hainaii）获得了单调高速（时间分辨率$ = 2 \，$ S）光度计数据集。固有的光曲线令人满意地适合现有的冥王星大气模型。在2012年以后报告的$ r = 1215〜 {\ rm km} $的参考半径上的最低压力值在2012年后报告的压力值，这表明可能很快（大约$ 21^{+4} _ { - 5} \％的上一个价值的值下降）压力下降，但在2016年之间的压力下降（最新报告的估计值）（最新报告估计）和2019年的降落是在2.4σ$2.4σ$lut上来的，并保持了2.4的级别。如果真实，则这种趋势与以前研究报告的冥王星大气压的单调增加相反。观察到的下降趋势可能是由持续的$ {\ rm n_2} $凝结过程引起的，如先前的理论模型所预测的那样，与太阳能死亡的轨道驱动下降相关的冰川冰川中的冰川冰川中的凝结过程可能引起。但是，观察到的压力降低幅度大于模型预测。
We report observations of a stellar occultation by Pluto on 2019 July 17. A single-chord high-speed (time resolution $= 2\,$s) photometry dataset was obtained with a CMOS camera mounted on the Tohoku University 60 cm telescope (Haleakala, Hawaii). The occultation light curve is satisfactorily fitted to an existing Pluto's atmospheric model. We find the lowest pressure value at a reference radius of $r = 1215~{\rm km}$ among those reported after 2012, indicating a possible rapid (approximately $21^{+4}_{-5} \%$ of the previous value) pressure drop between 2016 (the latest reported estimate) and 2019. However, this drop is detected at a $2.4σ$ level only and still requires confirmation from future observations. If real, this trend is opposite to the monotonic increase of Pluto's atmospheric pressure reported by previous studies. The observed decrease trend is possibly caused by ongoing ${\rm N_2}$ condensation processes in the Sputnik Planitia glacier associated with an orbitally driven decline of solar insolation, as predicted by previous theoretical models. However, the observed amplitude of the pressure decrease is larger than the model predictions.
