Year	Author	Title	Abstract	Type	ISSN	Publisher	Publication Date	Publication Title	Volume	Issue	Page Range	Persistent URL	Funding Agency	Grant	DOI	EPrintID
2018	Hillenbrand, Lynne A./Peña, Carlos Contreras/Morrell, Sam/Naylor, Tim/Kuhns, Michael A./Cutri, Roc M./Rebull, Luisa M./Hodgkin, Simon/Froebrich, Dirk/Mainzer, Amy K. 	Gaia 17bpi: An FU Ori Type Outburst	We report on the source Gaia 17bpi and identify it as a new, ongoing FU Ori–type outburst, associated with a young stellar object. The optical light curve from Gaia exhibited a 3.5 mag rise with the source appearing to plateau in mid-/late 2018. Mid-infrared observations from NEOWISE also show a >3 mag rise that occurred in two stages, with the second one coincident with the optical brightening, and the first one preceding the optical brightening by ~1.5 yr. We model the outburst as having started between October and December of 2014. This wavelength-dependent aspect of young star accretion-driven outbursts has never been documented before. Both the mid-infrared and the optical colors of the object become bluer as the outburst proceeds. Optical spectroscopic characteristics in the outburst phase include: a GK-type absorption spectrum, strong wind/outflow in, e.g., Mgb, NaD, Hα, K I, O I, and Ca II profiles, and detection of Li I 6707 Å. The infrared spectrum in the outburst phase is similar to that of an M-type spectrum, notably exhibiting prominent H_2O and a^(12)CO (2–0) bandhead absorption in the K band, and likely He I wind in the Yband. The new FU Ori source Gaia 17bpi is associated with a little-studied dark cloud in the galactic plane, located at a distance of 1.27 kpc.	article	1538-4357	American Astronomical Society	2018-12-20	Astrophysical Journal	869	2	Art. No. 146	http://resolver.caltech.edu/CaltechAUTHORS:20181218-090456440	Leverhulme Trust/Science and Technology Facilities Council (STFC)	
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