Gaia21bty: An EXor light curve exhibiting a FUor spectrum

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F23%3A00131685" target="_blank" >RIV/00216224:14310/23:00131685 - isvavai.cz</a>

Result on the web

<a href="https://academic.oup.com/mnras/article/524/4/5548/7226206" target="_blank" >https://academic.oup.com/mnras/article/524/4/5548/7226206</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stad2135" target="_blank" >10.1093/mnras/stad2135</a>

Result language

angličtina

Original language name

Gaia21bty: An EXor light curve exhibiting a FUor spectrum

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

1365-2966

Volume of the periodical

524

Issue of the periodical within the volume

4

Country of publishing house

GB - UNITED KINGDOM

Number of pages

18

Pages from-to

5548-5565

UT code for WoS article

001048593700007

EID of the result in the Scopus database

2-s2.0-85168768783