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Photometric and spectroscopic study of the burst-like brightening of two Gaia-alerted young stellar objects

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cris.lastimport.scopus2024-02-12T19:10:07Z
dc.abstract.enYoung stars show variability on different time-scales from hours to decades, with a range of amplitudes. We studied two young stars, which triggered the Gaia Science Alerts system due to brightenings on a time-scale of a year. Gaia20bwa brightened by about half a magnitude, whereas Gaia20fgx brightened by about two and half magnitudes. We analysed the Gaia light curves, additional photometry, and spectra taken with the Telescopio Nazionale Galileo and the Gran Telescopio Canarias. Several emission lines were detected towards Gaia20bwa, including hydrogen lines from H α to H δ, Pa β, Br γ, and lines of Ca II, O I, and Na I. The H α and Br γ lines were detected towards Gaia20fgx in emission in its bright state, with additional CO lines in absorption, and the Pa β line with an inverse P Cygni profile during its fading. Based on the Br γ lines, the accretion rate was $(2.4!-!3.1) imes 10^{-8}, { m M}_odot$ yr<SUP>-1</SUP> for Gaia20bwa and $(4.5!-!6.6) imes 10^{-8}, { m M}_odot$ yr<SUP>-1</SUP> for Gaia20fgx during their bright state. The accretion rate of Gaia20fgx dropped by almost a factor of 10 on a time-scale of half a year. The accretion parameters of both stars were found to be similar to those of classical T Tauri stars, lower than those of young eruptive stars. However, the amplitude and time-scale of these brightenings place these stars to a region of the parameter space, which is rarely populated by young stars. This suggests a new class of young stars, which produce outbursts on a time-scale similar to young eruptive stars, but with smaller amplitudes.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorGiannini, Teresa
dc.contributor.authorWyrzykowski, Łukasz
dc.contributor.authorKóspál, Ágnes
dc.contributor.authorGiunta, Alessio
dc.contributor.authorNagy, Zsófia
dc.contributor.authorPál, Andras
dc.contributor.authorKriskovics, Levente
dc.contributor.authorKun, Mária
dc.contributor.authorÁbrahám, Péter
dc.contributor.authorSzabados, László
dc.contributor.authorPark, Sunkyung
dc.contributor.authorSzabó, Zsófia Marianna
dc.contributor.authorAntoniucci, Simone
dc.contributor.authorMoór, Attila
dc.contributor.authorMarton, Gábor
dc.contributor.authorMiera, Fernando Cruz-Sáenz de
dc.contributor.authorFiorellino, Eleonora
dc.contributor.authorNisini, Brunella
dc.contributor.authorGarcía-Álvarez, David
dc.contributor.authorZieliński, Paweł
dc.contributor.authorSiwak, Michał
dc.date.accessioned2024-01-25T16:36:48Z
dc.date.available2024-01-25T16:36:48Z
dc.date.copyright2022-07-05
dc.date.issued2022
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number2
dc.description.versionORIGINAL_AUTHOR
dc.description.volume515
dc.identifier.doi10.1093/MNRAS/STAC1915
dc.identifier.issn0035-8711
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/115844
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2022MNRAS.515.1774N
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.relation.pages1774-1787
dc.rightsOther
dc.sciencecloudnosend
dc.titlePhotometric and spectroscopic study of the burst-like brightening of two Gaia-alerted young stellar objects
dc.typeJournalArticle
dspace.entity.typePublication