Gaia21bty: An EXor light curve exhibiting a FUor spectrum

Author:

Siwak Michał12ORCID,Hillenbrand Lynne A3,Kóspál Ágnes1245,Ábrahám Péter124,Giannini Teresa6,De Kishalay7,Moór Attila12,Szilágyi Máté124ORCID,Janík Jan8ORCID,Koen Chris9,Park Sunkyung12ORCID,Nagy Zsófia12ORCID,Cruz-Sáenz de Miera Fernando12ORCID,Fiorellino Eleonora1210,Marton Gábor12ORCID,Kun Mária12ORCID,Lucas Philip W11ORCID,Udalski Andrzej12,Szabó Zsófia Marianna121314

Affiliation:

1. Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Eötvös Loránd Research Network (ELKH), Hungarian Academy of Sciences ,   Konkoly-Thege Miklós út 15–17, H-1121 Budapest , Hungary

2. CSFK, MTA Centre of Excellence , Konkoly Thege Miklós út 15–17, H-1121 Budapest , Hungary

3. Department of Astronomy, California Institute of Technology , Pasadena, CA 91125 , USA

4. Institute of Physics, ELTE Eötvös Loránd University , Pázmány Péter sétány 1/A, H-1117 Budapest , Hungary

5. Max Planck Institute for Astronomy , Kónigstuhl 17, D-69117 Heidelberg , Germany

6. INAF-Osservatorio Astronomico di Roma , via di Frascati 33, I-00040 Monte Porzio Catone , Italy

7. Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139 , USA

8. Department of Theoretical Physics and Astrophysics, Masaryk University , Kotlářská 2, Brno, CZ-611 37 , Czech Republic

9. Department of Statistics, University of the Western Cape , Private Bag X17, Bellville, 7535 Cape , South Africa

10. INAF-Osservatorio Astronomico di Capodimonte , via Moiariello 16, I-80131 Napoli , Italy

11. Centre for Astrophysics, University of Hertfordshire , College Lane, Hatfield AL10 9AB , UK

12. Astronomical Observatory, University of Warsaw , Al. Ujazdowskie 4, PL-00-478 Warszawa , Poland

13. Max-Planck-Institut für Radioastronomie , Auf dem Hügel 69, D-53121 Bonn , Germany

14. Scottish Universities Physics Alliance (SUPA), School of Physics and Astronomy, University of St Andrews , North Haugh, St Andrews KY16 9SS , UK

Abstract

ABSTRACT Gaia21bty, a pre-main-sequence star that previously had shown aperiodic dips in its light curve, underwent a considerable ΔG ≈ 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 ∼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⊙ and the mass accretion rate is 2.5 × 10−5 M⊙ 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.

Funder

European Research Council

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Spectroscopic confirmation of high-amplitude eruptive YSOs and dipping giants from the VVV survey;Monthly Notices of the Royal Astronomical Society;2024-01-23

2. Multiwavelength detection of an ongoing FUOr-type outburst on a low-mass YSO;Monthly Notices of the Royal Astronomical Society: Letters;2023-12-27

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