Németh, Patrik and Cruz-Sáenz de Miera, Fernando and Kóspál, Ágnes and Fiorellino, Elenonora and Nagy, Zsófia and Szilágyi, Máté and Siwak, Michal and Lykou, Foteini and Kun, Mária and Ábrahám, Péter and Szabó, Zsófia Marianna and Giannini, Teresa and Wyrzykowski, Lukasz (2026) Gaia20dsk: A new MNor discovered by the GLORIOUS collaboration. ASTRONOMY & ASTROPHYSICS. ISSN 0004-6361 (In Press)
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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 light curve shows two major and one brief brightening events with an maximum amplitude of ∼ 1.8 mag in the last five years. A classification based on spectral index indicates that Gaia20dsk is a flat-spectrum star. The X-SHOOTER spectrum exhibit emission lines characteristic of accreting low-to-intermediate-mass young stars, displaying features typical of MNor-type objects. The mass accretion rate is between (0.5 − 1.8) × 10−6 M⊙/yr. Conclusions. Gaia20dsk is an eruptive YSO that exhibits photometric features similar to those of MNors, including its characteristic brightening amplitude and burst duration, along with similar spectroscopic features and accretion rates.
| Item Type: | Article |
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| Uncontrolled Keywords: | stars: formation; stars: low-mass stars; stars: pre-main sequence; accretion |
| Subjects: | Q Science / természettudomány > QB Astronomy, Astrophysics / csillagászat, asztrofizika |
| Depositing User: | Dr. Zsófia Nagy |
| Date Deposited: | 26 Jan 2026 13:50 |
| Last Modified: | 26 Jan 2026 13:50 |
| URI: | https://real.mtak.hu/id/eprint/232649 |
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Gaia20dsk: A new MNor discovered by the GLORIOUS
collaboration. (deposited 15 Jan 2026 13:17)
- Gaia20dsk: A new MNor discovered by the GLORIOUS collaboration. (deposited 26 Jan 2026 13:50) [Currently Displayed]
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