SIWAK, Michal, Lynne A HILLENBRAND, Agnes KOSPAL, Peter ABRAHAM, Teresa GIANNINI, Kishalay DE, Attila MOOR, Mate SZILAGYI, Jan JANÍK, Chris KOEN, Sunkyung PARK, Zsofia NAGY, de Miera Fernando CRUZ-SAENZ, Eleonora FIORELLINO, Gabor MARTON, Maria KUN, Philip W LUCAS, Andrzej UDALSKI a Zsofia Marianna SZABO. Gaia21bty: An EXor light curve exhibiting a FUor spectrum. Monthly Notices of the Royal Astronomical Society. Oxford University Press, 2023, roč. 524, č. 4, s. 5548-5565. ISSN 0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/stad2135. |
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@article{2310402, author = {Siwak, Michal and Hillenbrand, Lynne A and Kospal, Agnes and Abraham, Peter and Giannini, Teresa and De, Kishalay and Moor, Attila and Szilagyi, Mate and Janík, Jan and Koen, Chris and Park, Sunkyung and Nagy, Zsofia and CruzandSaenz, de Miera Fernando and Fiorellino, Eleonora and Marton, Gabor and Kun, Maria and Lucas, Philip W and Udalski, Andrzej and Szabo, Zsofia Marianna}, article_number = {4}, doi = {http://dx.doi.org/10.1093/mnras/stad2135}, keywords = {accretion; accretion discs; stars: formation; stars: pre-main-sequence; stars: variables: T Tauri; Herbig Ae/Be}, language = {eng}, issn = {0035-8711}, journal = {Monthly Notices of the Royal Astronomical Society}, title = {Gaia21bty: An EXor light curve exhibiting a FUor spectrum}, url = {https://academic.oup.com/mnras/article/524/4/5548/7226206}, volume = {524}, year = {2023} }
TY - JOUR ID - 2310402 AU - Siwak, Michal - Hillenbrand, Lynne A - Kospal, Agnes - Abraham, Peter - Giannini, Teresa - De, Kishalay - Moor, Attila - Szilagyi, Mate - Janík, Jan - Koen, Chris - Park, Sunkyung - Nagy, Zsofia - Cruz-Saenz, de Miera Fernando - Fiorellino, Eleonora - Marton, Gabor - Kun, Maria - Lucas, Philip W - Udalski, Andrzej - Szabo, Zsofia Marianna PY - 2023 TI - Gaia21bty: An EXor light curve exhibiting a FUor spectrum JF - Monthly Notices of the Royal Astronomical Society VL - 524 IS - 4 SP - 5548-5565 EP - 5548-5565 PB - Oxford University Press SN - 00358711 KW - accretion KW - accretion discs KW - stars: formation KW - stars: pre-main-sequence KW - stars: variables: T Tauri KW - Herbig Ae/Be UR - https://academic.oup.com/mnras/article/524/4/5548/7226206 N2 - Gaia21bty, a pre-main-sequence star that previously had shown aperiodic dips in its light curve, underwent a considerable Delta G approximate to 2.9 mag brightening that occurred over a few months between 2020 October and 2021 February. The Gaia light curve shows that the star remained near maximum brightness for about 4-6 months, and then started slowly fading over the next 2 yr, with at least three superimposed similar to 1 mag sudden rebrightening events. Whereas the amplitude and duration of the maximum is typical for EX Lupi-type stars, optical and near-infrared spectra obtained at the maximum are dominated by features which are typical for FU Ori-type stars (FUors). Modelling of the accretion disc at the maximum indicates that the disc bolometric luminosity is 43 L-circle dot and the mass accretion rate is 2.5 x 10(-5) M-circle dot yr(-1), which are typical values for FUors even considering the large uncertainty in the distance (1.7(-0.4)(+0.8) kpc). Further monitoring is necessary to understand the cause of the quick brightness decline, the rebrightening, and the other post-outburst light changes, as our multicolour photometric data suggest that they could be caused by a long and discontinuous obscuration event. We speculate that the outburst might have induced large-scale inhomogeneous dust condensations in the line of sight leading to such phenomena, whilst the FUor outburst continues behind the opaque screen. ER -
SIWAK, Michal, Lynne A HILLENBRAND, Agnes KOSPAL, Peter ABRAHAM, Teresa GIANNINI, Kishalay DE, Attila MOOR, Mate SZILAGYI, Jan JANÍK, Chris KOEN, Sunkyung PARK, Zsofia NAGY, de Miera Fernando CRUZ-SAENZ, Eleonora FIORELLINO, Gabor MARTON, Maria KUN, Philip W LUCAS, Andrzej UDALSKI a Zsofia Marianna SZABO. Gaia21bty: An EXor light curve exhibiting a FUor spectrum. \textit{Monthly Notices of the Royal Astronomical Society}. Oxford University Press, 2023, roč.~524, č.~4, s.~5548-5565. ISSN~0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnras/stad2135.
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