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arXiv · 2101.04203

Outbursting Young Stellar Object PGIR 20dci in the Perseus Arm

Lynne A. Hillenbrand·Kishalay De·Matthew Hankins·Mansi M. Kasliwal·Luisa M. Rebull·Ryan M. Lau·Roc M. Cutri·Michael C. B. Ashley·Viraj R. Karambelkar·Anna M. Moore·T. Travouillon·A. K. Mainzer
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Abstract

We report the discovery of a likely outbursting Class I young stellar object, associated with the star-forming region NGC 281-W (distance $\sim 2.8$ kpc). The source is currently seen only at infrared wavelengths, appearing in both the Palomar Gattini InfraRed ($1.2~\mu$m) and the Near Earth Object Widefield Infrared Survey Explorer ($3.4$ and $4.6~\mu$m) 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, H$_2$O, and OH, weak absorption in several atomic lines, and a warm wind/outflow as indicated by a P Cygni profile in the HeI 10830 A 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.

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Lynne A. Hillenbrand, Kishalay De, Matthew Hankins, Mansi M. Kasliwal, Luisa M. Rebull, Ryan M. Lau, Roc M. Cutri, Michael C. B. Ashley, Viraj R. Karambelkar, Anna M. Moore, T. Travouillon, A. K. Mainzer. 2021-01-11. Outbursting Young Stellar Object PGIR 20dci in the Perseus Arm. https://doi.org/10.3847/1538-3881/abe406

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