Gaia20dsk: A new MNor discovered by the GLORIOUS collaboration
Patrik E. N\'emeth, Fernando Cruz-S\'aenz de Miera, \'Agnes K\'osp\'al, Eleonora Fiorellino, Zs\'ofia Nagy, M\'at\'e Szil\'agyi, Michal Siwak, Foteini Lykou, M\'aria Kun, P\'eter \'Abrah\'am, Zs\'ofia Marianna Szab\'o, Teresa Giannini, Lukasz Wyrzykowski

TL;DR
Gaia20dsk is a young eruptive star exhibiting multiple brightness bursts, with spectral and accretion features confirming its classification as an MNor-type young stellar object.
Contribution
This study provides the first detailed physical and accretion analysis of Gaia20dsk, confirming its classification as an MNor-type eruptive young star.
Findings
Gaia20dsk experienced two major brightness bursts with ~1.8 mag amplitude.
Spectroscopic features are consistent with accreting low-to-intermediate-mass YSOs.
Mass accretion rate during bursts is estimated between 0.5 and 1.8 x 10^{-6} M_sun/yr.
Abstract
Context. Among known young stellar objects (YSOs), those exhibiting the most dramatic increases in brightness due to sudden increase in mass accretion rate are eruptive young stars. Gaia20dsk is one of the Gaia-alerted young star candidates that has displayed a double, nonperiodic brightening resembling that of other young eruptive stars. Aims. The goal of this work is to determine the physical and accretion properties of Gaia20dsk to confirm its classification as an eruptive young star. Methods. We combined publicly available optical and near-infrared (NIR) photometry with our X-shooter optical/NIR spectrum. In our analysis, we examined the optical and IR light curves from the bursts, reviewing the color-magnitude diagrams across different bands, reporting the detection of emission lines, and providing estimates of the star's accretion rates during the burst. Results. The optical…
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Gamma-ray bursts and supernovae · Astro and Planetary Science
