Search Publications
Serendipitous discovery of the magnetic cataclysmic variable SRGE J075818−612027
Brink, Jaco; Buckley, David A. H.; Schwope, Axel +5 more
We report the discovery of SRGE J075818−612027, a deep stream-eclipsing magnetic cataclysmic variable found serendipitously in SRG/eROSITA calibration and performance verification phase (CalPV) observations of the open cluster NGC 2516 as an unrelated X-ray source. An X-ray timing and spectral analysis of the eROSITA data is presented and suppleme…
Plausible association of distant late M dwarfs with low-frequency radio emission
Callingham, J. R.; Shimwell, T. W.; Hardcastle, M. J. +10 more
We present the serendipitous discovery of eight distant (> 50 pc) late M dwarfs with plausible associated radio emission at 144 MHz. The M-dwarf nature of our sources has been confirmed with optical spectroscopy performed using HET/LRS2 and Subaru/FOCAS, and their radio flux densities are within the range of 0.5−1.0 mJy at 144 MHz. Considering …
Estimating the energy flux of transverse waves associated with Kelvin-Helmholtz instability in solar coronal loops
Guo, Mingzhe; Gao, Yuhang; Van Doorsselaere, Tom +1 more
Context. The energy flux of kink waves in coronal loops has been estimated in previous studies. Recent numerical simulations have revealed that kink oscillations can induce a Kelvin-Helmholtz Instability (KHI) in magnetic flux tubes. This non-linear process breaks the assumptions that have typically been included in previous eigenmode analyses. Th…
Cometary dust collected by MIDAS on board Rosetta. II. Particle shape descriptors and pristineness evaluation
Lasue, J.; Bentley, M. S.; Mannel, T. +4 more
Context. The MIDAS (Micro-Imaging Dust Analysis System) atomic force microscope on board the Rosetta comet orbiter investigated and measured the 3D topography of a few hundred of nm to tens of µm sized dust particles of 67P/Churyumov-Gerasimenko with resolutions down to a few nanometers, giving insights into the physical processes of our ear…
Deriving physical parameters of unresolved star clusters. VII. Adaptive aperture photometry of the M 31 PHAT star clusters
Stonkutė, Rima; Vansevičius, Vladas; Kriščiūnas, Eimantas +1 more
Context. This work is the seventh study in a series dedicated to investigating degeneracies of simultaneous age, mass, extinction, and metallicity determinations of partially resolved or unresolved star clusters with Hubble Space Telescope broadband aperture photometry. In the sixth work (hereafter, Paper I), it was demonstrated that the adaptive …
Phase locking among Saturn radio emissions revealed by Cassini observations
Xu, Yan; Fischer, Georg; Yao, Zhonghua +7 more
Context. Rotational modulation has been observed in different magnetospheric phenomena at Saturn, including radio emissions, which reflect the fundamental plasma processes in key regions. Though previous studies have shown Saturn's kilometric radiation, 5 kHz narrowband emissions, and auroral hiss to be rotationally modulated, the modulation featu…
A trio of month-long flares in the nova-like variable V704 And
Pringle, J. E.; Naylor, T.; Page, K. L. +2 more
We present the discovery of an unusual set of flares in the nova-like variable V704 And. Using data from AAVSO, ASAS-SN, and ZTF for the nova-like variable V704 And, we discovered a trio of brightening events that occurred during the high state. These events elevate the optical brightness of the source from ∼13.5 to ∼12.5 mag. The events last for …
Relation between spectral indices and binary fractions in globular clusters
Li, L.; Han, Z.; Zhang, F. +1 more
Context. We study the relation between the known binary fraction and spectral absorption feature index to judge whether (and potentially which) spectral absorption feature indices are suitable for determining the binary fraction.
Aims: The determination of the binary fraction is important in studies of binary star formation, evolutionary popu…
The X-ray activity of F stars with hot Jupiters: KELT-24 versus WASP-18
Micela, G.; Pillitteri, I.; Wolk, S. J. +1 more
X-rays emitted by the coronae of solar-type stars are a feature present in up to late-A types during the main sequence phase. F stars, either with or without hot Jupiters, are usually X-ray emitters. The very low level of X-ray emission of the F5 star WASP-18 despite its relatively young age and spectral type is thus quite peculiar. In this paper …
XMM-Newton observation of the TeV-discovered supernova remnant HESS J1534-571
Santangelo, A.; Pühlhofer, G.; Sasaki, M. +3 more
We report the results obtained from XMM-Newton observations of the TeV-detected supernova remnant (SNR) HESS J1534-571. We focus on the nature of the cosmic-ray particle content in the SNR, which is revealed by its γ-ray emission. No signatures of X-ray synchrotron emission were detected from the SNR. This is consistent with earlier results obtain…