The 2023 outburst of the Gaia alerted EXor Gaia23bab
Zs\'ofia Nagy, \'Agnes K\'osp\'al, P\'eter \'Abrah\'am, Teresa, Giannini, M\'aria Kun, Manuele Gangi, Fernando Cruz-S\'aenz de Miera, Michael, Kuhn, Micha{\l} Siwak, M\'at\'e Szil\'agyi, Eleonora Fiorellino, Simone, Antoniucci, Katia Biazzo, Attila B\'odi, Zs\'ofia Bora

TL;DR
This paper investigates the 2023 outburst of Gaia23bab, an EXor young star, using multi-wavelength observations to analyze its accretion properties, line emissions, and physical conditions, confirming its classification as a typical EXor.
Contribution
The study provides detailed spectroscopic analysis of Gaia23bab's outburst, measuring accretion rates and physical conditions, and confirms its classification as a prototypical EXor based on emission line diagnostics.
Findings
Accretion rate of approximately 2.0 x 10^-7 M_sun/yr during outburst
Excitation temperatures of 5000-10000 K and electron densities of 10^9-10^10 cm^-3 from hydrogen lines
Gaia23bab's physical properties align with typical EXor characteristics
Abstract
Episodic accretion is a fundamental process in the build-up of the stellar mass. EX Lupi-type eruptive young stars (EXors) represent one of the main types of episodic accretion. We study the recently discovered EXor Gaia23bab during its 2023 outburst. We obtained optical and near-infrared photometry and spectroscopy to probe the variation of the physical properties of Gaia23bab during its recent outburst. We also collected archival photometry to study a previous outburst of the star. We used several accretion tracers, including the Ca II triplet, He I, and various hydrogen lines from the Paschen and Brackett series, to measure the accretion rate during the outburst. The accretion rate is consistent with . Comparing the line fluxes of the hydrogen Brackett series to predictions of Case B theory suggests excitation temperatures of 5000 -…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsComputational Physics and Python Applications · Distributed and Parallel Computing Systems · Geomagnetism and Paleomagnetism Studies
