TY - JOUR
T1 - Gaia 17bpi
T2 - An FU Ori-type Outburst
AU - Hillenbrand, Lynne A.
AU - Pena, Carlos Contreras
AU - Morrell, Sam
AU - Naylor, Tim
AU - Kuhn, Michael A.
AU - Cutri, Roc M.
AU - Rebull, Luisa M.
AU - Hodgkin, Simon
AU - Froebrich, Dirk
AU - Mainzer, Amy K.
N1 - Publisher Copyright:
© 2018. The American Astronomical Society. All rights reserved..
PY - 2018/12/20
Y1 - 2018/12/20
N2 - 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 H2O and 12CO (2-0) bandhead absorption in the K band, and likely He i wind in the Y band. 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.
AB - 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 H2O and 12CO (2-0) bandhead absorption in the K band, and likely He i wind in the Y band. 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.
KW - circumstellar matter
KW - stars: activity
KW - stars: general
KW - stars: pre-main sequence
KW - stars: variables:general
KW - stars: winds, outflows
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U2 - 10.3847/1538-4357/aaf414
DO - 10.3847/1538-4357/aaf414
M3 - Article
AN - SCOPUS:85059838164
SN - 0004-637X
VL - 869
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 146
ER -