We report the discovery of a likely outbursting Class I young stellar object, associated with the star-forming region NGC 281-W (distance ∼2.8 kpc). The source is currently seen only at infrared wavelengths, appearing in both the Palomar Gattini InfraRed (1.2 μm) and the Near-Earth Object Wide-field Infrared Survey Explorer (3.4 and 4.6 μm) photometric time-domain surveys. Recent near-infrared imaging reveals a new, extended scattered light nebula. Recent near-infrared spectroscopy confirms the similarity of PGIR 20dci to FU Ori–type sources, based on strong molecular absorption in CO, H₂O, and OH; weak absorption in several atomic lines; and a warm wind/outflow as indicated by a P Cygni profile in the He i λ10830 line. This is a rare case of an FU Ori star with a well-measured long-term photometric rise before a sharper outburst, and the second instance of an FU Ori star with a documented two-step brightening in the mid-infrared.

我们报告发现了一个可能爆发的 I 类年轻恒星物体，与恒星形成区域 NGC 281-W（距离 ~2.8 kpc）相关。该源目前仅在红外波长处可见，出现在 Palomar Gattini 红外 (1.2 μ m) 和近地天体宽视场红外勘测探测器 (3.4 和 4.6 μ m) 光度时域勘测中。最近的近红外成像揭示了一个新的、扩展的散射光星云。最近的近红外光谱证实了 PGIR 20dci 与 FU Ori 型光源的相似性，基于在 CO、H ₂ O 和 OH 中的强分子吸收；几个原子线的弱吸收；以及 He i λ 中P Cygni 剖面所指示的暖风/流出10830线。这是 FU Ori 星的罕见情况，在更剧烈的爆发之前具有良好测量的长期光度上升，以及 FU Ori 星的第二个实例，在中红外区域记录了两步增亮。