Gaia 18dvy: a new FUor in the Cygnus OB3 association

Abstract

We present optical-infrared photometric and spectroscopic observations of Gaia18dvy, located in the Cygnus OB3 association at a distance of 1.88 kpc. The object was noted by the Gaia alerts system when its lightcurve exhibited a $\gtrsim$4 mag rise in 2018-2019. The brightening was also observable at mid-infared wavelengths. The infrared colors of Gaia18dvy became bluer as the outburst progressed. Its optical and near-infrared spectroscopic characteristics in the outburst phase are consistent with those of bona fide FU Orionis-type young eruptive stars. The progenitor of the outburst is probably a low-mass K-type star with an optical extinction of $\sim$3 mag. A radiative transfer modeling of the circumstellar structure, based on the quiescent spectral energy distribution, indicates a disk with a mass of $4\times 10^{-3}{M}_{\odot }$. Our simple accretion disk modeling implies that the accretion rate had been exponentially increasing for more than 3 years until mid-2019, when it reached a peak value of $6.9\times 10^{-6}{M}_{\odot }$yr${}^{-1}$. In many respects, Gaia18dvy is similar to the FU Ori-type object HBC 722

11 pages, 7 figures, accepted for publication in ApJ

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• Spectroscopic confirmation of high-amplitude eruptive YSOs and dipping giants from the VVV survey
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• The most variable VVV sources: eruptive protostars, dipping giants in the Nuclear Disc and others
• Gaia21bty: An EXor lightcurve exhibiting an FUor spectrum
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• WTP10aaauow: Discovery of a new FU Ori outburst towards the RCW49 star-forming region in NEOWISE data
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• Spectroscopy of 9 eruptive young variables using TANSPEC
• The Enigma of Gaia18cjb: a Rare Hybrid of FUor and EXor?
• Photometric and spectroscopic study of the burst-like brightening of two Gaia-alerted young stellar objects
• The Effelsberg survey of FU Orionis and EX Lupi objects I. -- Host environments of FUors/EXors traced by NH${}_3$
• Molecular inventory of a young eruptive star's environment -- Case study of the classical FU Orionis star V1057 Cyg
• Gaia20bdk -- a new FUor in Sh 2-301 Star Forming Region
• The Effelsberg survey of FU~Orionis and EX~Lupi objects II. -- H${}_2$O maser observations
• A study of the photometric and spectroscopic variations of the prototypical FU Orionis-type star V1057 Cyg
• Automatic Detection of Accretion Bursts in Young Stellar Objects: a New Algorithm for Long--Term Sky Surveys