14.2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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97 papers · 1 filter
Gaia21bja: pre-main sequence star with quasi-periodic bursts
Ádám Mátéfy, Zsófia Nagy, Ágnes Kóspál +12
Gaia21bja is a Gaia alerted young stellar object (YSO) that exhibits at least seven quasi-peridoic brightenings over a 20 year-long light curve with durations of 1.5-2 years and am…
Gaia20dsk: A new MNor discovered by the GLORIOUS collaboration
Patrik E. Németh, Fernando Cruz-Sáenz de Miera, Ágnes Kóspál +10
Context. Among known young stellar objects (YSOs), those exhibiting the most dramatic increases in brightness due to sudden increase in mass accretion rate are eruptive young stars…
Test particle sampling and particle acceleration in a 2D coronal plasmoid-mediated reconnecting current sheet
Eilif S. Øyre, Boris V. Gudiksen, Lyndsay Fletcher
Context: Solar flares accelerate electrons, creating non-thermal energy distributions. However, the acceleration sites and dominant acceleration mechanisms remain largely unknown.…
Short- and long-term variations of the high mass accretion rate classical T Tauri star DR Tau
Gabriella Zsidi, Ágnes Kóspál, Péter Ábrahám +20
Classical T Tauri stars are newly formed, low mass stars which may display both periodic and random variations in their brightness. The interaction between the star and its circums…
Molecular inventory of a young eruptive star's environment -- Case study of the classical FU Orionis star V1057 Cyg
Zs. M. Szabó, A. Belloche, K. M. Menten +6
Studying accretion-driven episodic outbursts in YSOs is key to understanding the later stages of star and planet formation. FU Orionis-type objects form a YSO subclass, distinguish…
Gaia20bdk -- a new FUor in Sh 2-301 Star Forming Region
M. Siwak, Á. Kóspál, P. Ábrahám +28
Context. We analyse multi-colour photometric and spectroscopic observations of a Young Stellar Object Gaia20bdk. Aims. We aim to investigate the exact nature of the eruptive phenom…
Exploring the directly imaged HD 1160 system through spectroscopic characterization and high-cadence variability monitoring
Ben J. Sutlieff, Jayne L. Birkby, Jordan M. Stone +15
The time variability and spectra of directly imaged companions provide insight into their physical properties and atmospheric dynamics. We present follow-up R~40 spectrophotometric…
The Enigma of Gaia18cjb: a Rare Hybrid of FUor and EXor?
Eleonora Fiorellino, Peter Abraham, Agnes Kospal +28
Context. Gaia18cjb is one of the Gaia-alerted eruptive young star candidates which has been experiencing a slow and strong brightening during the last 13 years, similar to some FU…
Insights into the first and second hydrostatic core stages from numerical simulations
Alison K. Young
The theory of how low mass stars form from the collapse of a dense molecular cloud core has been well-established for decades. Thanks to significant progress in computing and numer…
Strong constraints on the gravitational law from DR3 wide binaries
Indranil Banik, Charalambos Pittordis, Will Sutherland +4
We test Milgromian dynamics (MOND) using wide binary stars (WBs) with separations of kAU. Locally, the WB orbital velocity in MOND should exceed the Newtonian prediction by…
Gaia21bty: An EXor lightcurve exhibiting an FUor spectrum
Michał Siwak, Lynne A. Hillenbrand, Ágnes Kóspál +16
Gaia21bty, a pre-main sequence star that previously had shown aperiodic dips in its light curve, underwent a considerable mag brightening that occurred over a few mo…
The Gaia alerted fading of the FUor-type star Gaia21elv
Zsófia Nagy, Sunkyung Park, Péter Ábrahám +26
FU Orionis objects (FUors) are eruptive young stars, which exhibit outbursts that last from decades to a century. Due to the duration of their outbursts, and to the fact that only…
Three is the magic number -- distance measurement of NGC 3147 using SN 2021hpr and its siblings
Barnabas Barna, Andrea P. Nagy, Zsofia Bora +15
The nearby spiral galaxy NGC 3147 hosted three Type Ia supernovae (SNe Ia) in the past decades, which have been subjects of intense follow-up observations. Simultaneous analysis of…
The Effelsberg survey of FU~Orionis and EX~Lupi objects II. -- HO maser observations
Zs. M. Szabó, Y. Gong, W. Yang +7
FU Orionis (FUor) and EX Lupi (EXor) type objects are two groups of peculiar and rare pre-main sequence low-mass stars that are undergoing powerful accretion outbursts during their…
The Effelsberg survey of FU Orionis and EX Lupi objects I. -- Host environments of FUors/EXors traced by NH
Zs. M. Szabó, Y. Gong, K. M. Menten +6
FU Orionis (FUor) and EX Lupi (EXor) type objects represent two small, but rather spectacular groups of low-mass, young eruptive stars. Outbursts of several magnitudes are observed…
Photometric and spectroscopic study of the EXor-like eruptive young star Gaia19fct
Sunkyung Park, Ágnes Kóspál, Péter Ábrahám +19
Gaia19fct is one of the Gaia-alerted eruptive young stars that has undergone several brightening events. We conducted monitoring observations using multi-filter optical and near-in…
Photometric and spectroscopic study of the burst-like brightening of two Gaia-alerted young stellar objects
Zsófia Nagy, Péter Ábrahám, Ágnes Kóspál +18
Young 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…
A multi-epoch, multi-wavelength study of the classical FUor V1515 Cyg approaching quiescence
Zs. M. Szabó, Á. Kóspál, P. Ábrahám +28
Historically, FU Orionis-type stars are low-mass, pre-main sequence stars. The members of this class experience powerful accretion outbursts and remain in an enhanced accretion sta…
The disk of FU Orionis viewed with MATISSE/VLTI: first interferometric observations in and bands
F. Lykou, P. Ábrahám, L. Chen +30
The disk of FU Orionis is marginally resolved with MATISSE, suggesting that the region emitting in the thermal infrared is rather compact. An upper limit of mas (in…
On the origin of magnetic fields in stars II: The effect of numerical resolution
James Wurster, Matthew R. Bate, Daniel J. Price +1
Are the kG-strength magnetic fields observed in young stars a fossil field left over from their formation or are they generated by a dynamo? Our previous numerical study concluded…
Recurrent strong outbursts of an EXor-like young eruptive star Gaia20eae
Fernando Cruz-Sáenz de Miera, Ágnes Kóspál, Péter Ábrahám +21
We present follow-up photometric and spectroscopic observations, and subsequent analysis of Gaia20eae. This source triggered photometric alerts during 2020 after showing a 3…
V899 Mon: a peculiar eruptive young star close to the end of its outburst
Sunkyung Park, Ágnes Kóspál, Fernando Cruz-Sáenz de Miera +15
V899 Mon is an eruptive young star showing characteristics of both FUors and EXors. It reached a peak brightness in 2010, then briefly faded in 2011, followed by a second outburst.…
New binaries from the SHINE survey
M. Bonavita, R. Gratton, S. Desidera +67
We present the multiple stellar systems observed within the SpHere INfrared survey for Exoplanet (SHINE). SHINE searched for substellar companions to young stars using high contras…
Exploring the planetary-mass population in the Upper Scorpius association
N. Lodieu, N. C. Hambly, N. J. G. Cross
We aim at identifying very low-mass isolated planetary-mass member candidates in the nearest OB association to the Sun, Upper Scorpius (145 pc; 5-10 Myr), to constrain the form and…