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dc.contributor.authorPark, Sunkyung
dc.contributor.authorKóspál, Ágnes
dc.contributor.authorÁbrahám, Péter
dc.contributor.authorCruz-Sáenz de Miera, Fernando
dc.contributor.authorFiorellino, Eleonora
dc.contributor.authorSiwak, Michał
dc.contributor.authorNagy, Zsófia
dc.contributor.authorGiannini, Teresa
dc.contributor.authorCarini, Roberta
dc.contributor.authorSzabó, Zsófia Marianna
dc.contributor.authorLee, Jeong-Eun
dc.contributor.authorLee, Jae-Joon
dc.contributor.authorVitali, Fabrizio
dc.contributor.authorKun, Mária
dc.contributor.authorCseh, Borbála
dc.contributor.authorKrezinger, Máté
dc.contributor.authorKriskovics, Levente
dc.contributor.authorOrdasi, András
dc.contributor.authorPál, András
dc.contributor.authorSzakáts, Róbert
dc.contributor.authorVida, Krisztián
dc.contributor.authorVinkó, József
dc.identifier.citationPark , S , Kóspál , Á , Ábrahám , P , Cruz-Sáenz de Miera , F , Fiorellino , E , Siwak , M , Nagy , Z , Giannini , T , Carini , R , Szabó , Z M , Lee , J-E , Lee , J-J , Vitali , F , Kun , M , Cseh , B , Krezinger , M , Kriskovics , L , Ordasi , A , Pál , A , Szakáts , R , Vida , K & Vinkó , J 2022 , ' Photometric and spectroscopic study of the EXor-like eruptive young star Gaia19fct ' , Astrophysical Journal , vol. 941 , no. 2 , 165 .
dc.identifier.otherPURE: 282658559
dc.identifier.otherPURE UUID: 212072b7-7084-4056-b6bb-9d588d55596e
dc.identifier.otherJisc: 798513
dc.identifier.otherpublisher-id: apjaca01e
dc.identifier.othermanuscript: aca01e
dc.identifier.otherother: aas41764
dc.identifier.otherScopus: 85145280748
dc.identifier.otherWOS: 000900312100001
dc.identifier.otherORCID: /0000-0001-9830-3509/work/140361398
dc.descriptionFunding: This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program under grant agreement No. 716155 (SACCRED) and from the "Transient Astrophysical Objects" GINOP 2.3.2-15-2016-00033 project of the National Research, Development and Innovation Office (NKFIH), Hungary, funded by the European Union. We acknowledge support from ESA PRODEX contract No. 4000132054. Zs.N., L.K., and K.V. acknowledge the support by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences. K.V. is supported by the Bolyai+ grant UNKP-22-5-ELTE-1093. This project has been supported by the K-131508 grant of the Hungarian National Research, Development and Innovation Office (NKFIH) and the Élvonal grant KKP-143986. Authors acknowledge the financial support of the Austrian-Hungarian Action Foundation (101.u13, 104.u2). L.K. acknowledges the financial support of the Hungarian National Research, Development and Innovation Office grant NKFIH PD-134784. This project has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement No. 101004719 (OPTICON-RadioNet Pilot).en
dc.description.abstractGaia19fct is one of the Gaia-alerted eruptive young stars that has undergone several brightening events. We conducted monitoring observations using multifilter optical and near-infrared photometry, as well as near-infrared spectroscopy, to understand the physical properties of Gaia19fct and investigate whether it fits into the historically defined two classes. We present the analyses of light curves, color variations, spectral lines, and CO modeling. The light curves show at least five brightening events since 2015, and the multifilter color evolutions are mostly gray. The gray evolution indicates that bursts are triggered by mechanisms other than extinction. Our near-infrared spectra exhibit both absorption and emission lines and show time variability throughout our observations. We found lower rotational velocity and lower temperature from the near-infrared atomic absorption lines than from the optical lines, suggesting that Gaia19fct has a Keplerian rotating disk. The CO overtone features show a superposition of absorption and emission components, which is unlike other young stellar objects. We modeled the CO lines, and the result suggests that the emission and absorption components are formed in different regions. We found that although Gaia19fct exhibits characteristics of both types of eruptive young stars, FU Orionis–type objects and EX Lupi–type objects, it shows more similarity with EXors in general.
dc.relation.ispartofAstrophysical Journalen
dc.rightsCopyright © 2022. The Author(s). Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.en
dc.subjectQC Physicsen
dc.subjectQB Astronomyen
dc.titlePhotometric and spectroscopic study of the EXor-like eruptive young star Gaia19fcten
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. Arctic Research Centreen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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