Hillenbrand, Lynne A. and De, Kishalay and Hankins, Matthew and Kasliwal, Mansi M. and Rebull, Luisa M. and Lau, Ryan M. and Cutri, Roc M. and Ashley, Michael C. B. and Karambelkar, Viraj R. and Moore, Anna M. and Travouillon, T. and Mainzer, A. K. (2021) Outbursting Young Stellar Object PGIR 20dci in the Perseus Arm. Astronomical Journal, 161 (5). Art. No. 220. ISSN 1538-3881. doi:10.3847/1538-3881/abe406. https://resolver.caltech.edu/CaltechAUTHORS:20210204-092654941
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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 ~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.
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| Additional Information: | © 2021. The American Astronomical Society. Received 2020 December 23; revised 2021 February 2; accepted 2021 February 5; published 2021 April 9. Palomar Gattini-IR (PGIR) is generously funded by Caltech, Australian National University, the Mt. Cuba Foundation, the Heising Simons Foundation, and the Bi-national Science Foundation. PGIR is a collaborative project among Caltech, Australian National University, University of New South Wales, Columbia University, and the Weizmann Institute of Science. M.M.K. acknowledges generous support from the David and Lucille Packard Foundation. Facilities: Palomar Gattini IR - , PO:1.2 m:ZTF - , PO:1.5 m:SEDM - , Hale:WIRC, Hale:TSPEC - , Keck/NIRES - , Keck/DEIMOS - , Spitzer - , WISE - , NEOWISE - , IRSA. - | ||||||||||||||||||||
| Group: | Astronomy Department, Infrared Processing and Analysis Center (IPAC) | ||||||||||||||||||||
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| Subject Keywords: | Young stellar objects; Circumstellar disks; Stellar accretion disks; Pre-main sequence stars | ||||||||||||||||||||
| Issue or Number: | 5 | ||||||||||||||||||||
| Classification Code: | Unified Astronomy Thesaurus concepts: Young stellar objects (1834); Circumstellar disks (235); Stellar accretion disks (1579); Pre-main sequence stars (1290) | ||||||||||||||||||||
| DOI: | 10.3847/1538-3881/abe406 | ||||||||||||||||||||
| Record Number: | CaltechAUTHORS:20210204-092654941 | ||||||||||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20210204-092654941 | ||||||||||||||||||||
| Official Citation: | Lynne A. Hillenbrand et al 2021 AJ 161 220 | ||||||||||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||
| ID Code: | 107900 | ||||||||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||||||||
| Deposited By: | George Porter | ||||||||||||||||||||
| Deposited On: | 04 Feb 2021 21:54 | ||||||||||||||||||||
| Last Modified: | 23 Apr 2021 17:48 |
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