Gaia 18dvy: A New FUor in the Cygnus OB3 Association

August 2020 • 2020ApJ...899..130S

Authors • Szegedi-Elek, E. • Ábrahám, P. • Wyrzykowski, Ł. • Kun, M. • Kóspál, Á. • Chen, L. • Marton, G. • Moór, A. • Kiss, C. • Pál, A. • Szabados, L. • Varga, J. • Varga-Verebélyi, E. • Andreas, C. • Bachelet, E. • Bischoff, R. • Bódi, A. • Breedt, E. • Burgaz, U. • Butterley, T. • Carrasco, J. M. • Čepas, V. • Damljanovic, G. • Gezer, I. • Godunova, V. • Gromadzki, M. • Gurgul, A. • Hardy, L. • Hildebrandt, F. • Hoffmann, S. • Hundertmark, M. • Ihanec, N. • Janulis, R. • Kalup, Cs. • Kaczmarek, Z. • Könyves-Tóth, R. • Krezinger, M. • Kruszyńska, K. • Littlefair, S. • Maskoliūnas, M. • Mészáros, L. • Mikołajczyk, P. • Mugrauer, M. • Netzel, H. • Ordasi, A. • Pakštienė, E. • Rybicki, K. A. • Sárneczky, K. • Seli, B. • Simon, A. • Šiškauskaitė, K. • Sódor, Á. • Sokolovsky, K. V. • Stenglein, W. • Street, R. • Szakáts, R. • Tomasella, L. • Tsapras, Y. • Vida, K. • Zdanavičius, J. • Zieliński, M. • Zieliński, P. • Ziółkowska, O.

Abstract • We present optical-infrared photometric and spectroscopic observations of Gaia 18dvy, located in the Cygnus OB3 association at a distance of 1.88 kpc. Gaia 18dvy was noted by the Gaia alerts system when its light curve exhibited a ≳4 mag rise in 2018-2019. The brightening was also observable at mid-infared wavelengths. The infrared colors of Gaia 18dvy 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 ∼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 × 10^-3 M_⊙. Our simple accretion disk modeling implies that the accretion rate had been exponentially increasing for more than 3 yr until mid-2019, when it reached a peak value of 6.9 × 10^-6 M_⊙ yr^-1. In many respects, Gaia 18dvy is similar to the FU Ori-type object HBC 722.

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2020ApJ...899..130S
• PDF https://stacks.iop.org/0004-637X/899/130/pdf
• PREPRINT http://arxiv.org/abs/2005.11537
• DATA http://archive.eso.org/bin/ads2eso?2020ApJ...899..130S
• DATA https://archive.stsci.edu/mastbibref.php?bibcode=2020ApJ...899..130S
• DATA https://irsa.ipac.caltech.edu/bibdata/2020/S/2020ApJ...899..130S.html
• ELECTR https://doi.org/10.3847%2F1538-4357%2Faba129