학술논문
Recurrent strong outbursts of an EXor-like young eruptive star Gaia20eae
Document Type
Working Paper
Author
de Miera, Fernando Cruz-Sáenz; Kóspál, Ágnes; Ábrahám, Péter; Park, Sunkyung; Nagy, Zsófia; Siwak, Michał; Kun, Mária; Fiorellino, Eleonora; Szabó, Zsófia Marianna; Antoniucci, Simone; Giannini, Teresa; Nisini, Brunella; Szabados, László; Kriskovics, Levente; Ordasi, András; Szakáts, Róbert; Vida, Krisztián; Vinkó, József; Zieliński, Paweł; Wyrzykowski, Łukasz; García-Álvarez, David; Dróżdż, Marek; Ogłoza, Waldemar; Sonbas, Eda
Source
Subject
Language
Abstract
We present follow-up photometric and spectroscopic observations, and subsequent analysis of Gaia20eae. This source triggered photometric alerts during 2020 after showing a $\sim$3 mag increase in its brightness. Its Gaia Alert light curve showed the shape of a typical eruptive young star. We carried out observations to confirm Gaia20eae as an eruptive young star and classify it. Its pre-outburst spectral energy distribution shows that Gaia20eae is a moderately embedded Class II object with $L_\mathrm{bol} = 7.22$ L$_\odot$. The color-color and color-magnitude diagrams indicate that the evolution in the light curve is mostly gray. Multiple epochs of the H$\alpha$ line profile suggest an evolution of the accretion rate and winds. The near-infrared spectra display several emission lines, a feature typical of EXor-type eruptive young stars. We estimated the mass accretion rate during the dimming phase to be $\dot{M} = 3-8 \times 10^{-7}$ M$_\odot$ yr$^{-1}$, higher than typical T Tauri stars of similar mass and comparable to other EXors. We conclude Gaia20eae is a new EXor-type candidate.
Comment: Accepted for publication in ApJ. 20 pages, 11 figures
Comment: Accepted for publication in ApJ. 20 pages, 11 figures