Gaia18aen: First symbiotic star discovered by Gaia
J. Merc, J. Miko{\l}ajewska, M. Gromadzki, C. Ga{\l}an, K., I{\l}kiewicz, J. Skowron, {\L}. Wyrzykowski, S. T. Hodgkin, K. A. Rybicki, P., Zieli\'nski, K. Kruszy\'nska, V. Godunova, A. Simon, V. Reshetnyk, F. Lewis,, U. Kolb, M. Morrell, A. J. Norton, S. Awiphan, S. Poshyachinda

TL;DR
Gaia18aen is the first symbiotic star discovered by Gaia, characterized by a white dwarf and M giant, with a 487-day orbit and multiple outbursts, providing new insights into such systems through Gaia's photometric data.
Contribution
This paper reports the first discovery and detailed analysis of a symbiotic star using Gaia data, including its parameters, orbit, and outburst behavior.
Findings
Gaia18aen is an S-type symbiotic star with a 487-day orbit.
The system includes an M giant and a hot white dwarf.
Multiple re-brightenings occurred over hundreds of days.
Abstract
Besides the astrometric mission of the Gaia satellite, its repeated and high-precision measurements serve also as an all-sky photometric transient survey. The sudden brightenings of the sources are published as Gaia Photometric Science Alerts and are made publicly available allowing the community to photometrically and spectroscopically follow-up the object. The goal of this paper was to analyze the nature and derive the basic parameters of Gaia18aen, transient detected at the beginning of 2018. It coincides with the position of the emission line star WRAY 15-136. The brightening was classified as a "nova?" on the basis of subsequent spectroscopic observation. We have analyzed two spectra of Gaia18aen and collected the available photometry of the object covering the brightenings in 2018 and also the preceding and following periods of quiescence. Based on this observational data, we have…
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