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Published December 20, 2018 | Accepted Version + Published
Journal Article Open

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.

Additional Information

© 2018 The American Astronomical Society. Received 2018 October 6; revised 2018 November 9; accepted 2018 November 15; published 2018 December 20. We acknowledge ESA Gaia, DPAC, and the Photometric Science Alerts Team, as well as NASA's NEOWISE team. We are extremely grateful to Evan Kirby for obtaining and reducing to 1D format the Keck/DEIMOS spectrum presented here. We are also grateful to the Palomar Observatory staff for their real-time assistance in obtaining the TripleSpec spectrum presented here. Conversations with Kevin Burdge and Sean Carey about various photometric survey data sets were beneficial in our work. The contributions of C.C.P. and T.N. were funded by a Leverhulme Trust Research Project Grant and of S.M. through a Science and Technology Facilities Council studentship. Facilities: Gaia - , LT:IO:O - , LT:IO:I - , BO - , Hale:DBSP - , Hale:TSPEC - , Keck:I:DEIMOS - , IPHaS - , PanSTARRS - , 2MASS - , Spitzer - , Herschel - , WISE - , NEOWISE - , IRSA. -

Attached Files

Published - Hillenbrand_2018_ApJ_869_146.pdf

Accepted Version - 1812.06640.pdf


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Additional details

August 19, 2023
October 19, 2023