Search Publications
Detectability of Solar Rotation Period across Various Wavelengths
Solanki, Sami K.; Vasilyev, Valeriy; Reinhold, Timo +3 more
The light curves of old G dwarfs obtained in the visible and near-infrared wavelength ranges are highly irregular. This significantly complicates the detectability of the rotation periods of stars similar to the Sun in large photometric surveys, such as Kepler and TESS. In this study, we show that light curves collected in the ultraviolet (UV) wav…
Improving the Temporal Resolution of SOHO/MDI Magnetograms of Solar Active Regions Using a Deep Generative Model
Xu, Yan; Wang, Haimin; Yurchyshyn, Vasyl +6 more
We present a novel deep generative model, named GenMDI, to improve the temporal resolution of line-of-sight (LOS) magnetograms of solar active regions (ARs) collected by the Michelson Doppler Imager (MDI) on board the Solar and Heliospheric Observatory. Unlike previous studies that focus primarily on spatial super-resolution of MDI magnetograms, o…
What Is Inside the Double–Double Structure of the Radio Galaxy J0028+0035?
Frey, Sándor; Marecki, Andrzej; Gabányi, Krisztina Éva +1 more
The radio source J0028+0035 is a recently discovered double–double radio galaxy at redshift
XMM/HST monitoring of the ultra-soft highly accreting narrow-line Seyfert 1 RBS 1332
Bianchi, S.; Cappi, M.; Petrucci, P. -O. +10 more
Ultra-soft narrow-line Seyfert 1s (US-NLSy 1s) are a poorly observed class of active galactic nuclei characterised by significant flux changes and an extreme soft X-ray excess. This peculiar spectral shape represents a golden opportunity to test whether the standard framework commonly adopted for modelling local AGNs is still valid. We thus presen…
Analysis of the Gaia Data Release 3 Parallax Bias at Bright Magnitudes
Ding, Ye; Liao, Shilong; Wen, Shangyu +1 more
The combination of visual and spectroscopic orbits in binary systems enables precise distance measurements without additional assumptions, making them ideal for examining the parallax zero-point offset (PZPO) at bright magnitudes (G < 13) in Gaia. We compiled 249 orbital parallaxes from 246 binary systems and used Markov chain Monte Carlo simul…
4FGL J1544.2‑2554: A new spider pulsar candidate
Zharikov, S. V.; Karpova, A. V.; Shibanov, Yu. A. +3 more
Context. Spider pulsars are millisecond pulsars in tight binary systems in which a low-mass companion star is heated and ablated by the pulsar wind. Observations of these objects allow one to study stellar evolution with the formation of millisecond pulsars and the physics of superdense matter in neutron stars. However, spiders are rare due to dif…
Evidence for landslides in Sisyphi Cavi (Noachis Terra, Mars): Slope evolution and role of endogenous preparatory factors
Komatsu, Goro; Discenza, Marco Emanuele; Esposito, Carlo +4 more
The surface of Mars is characterized by the presence of numerous gravity-induced processes and mass movements with greatly variable sizes and peculiarities. Detailed geomorphological studies have recently made it possible to identify many landslide-like landforms along the slopes bordering pits of Sisyphi Cavi in Noachis Terra, the southern hemisp…
Resonant interactions between suprathermal protons and ion-scale waves near an interplanetary shock
Wimmer-Schweingruber, Robert F.; Rodríguez-Pacheco, Javier; Berger, Lars +8 more
Context. The interaction between waves and particles is crucial for particle acceleration near interplanetary shocks. Previously, research on these processes was constrained by limited data and the coarse time resolution of interplanetary missions. However, recent high-resolution observations from the Solar Orbiter mission are providing new insigh…
The Hobby–Eberly Telescope Dark Energy Experiment Survey (HETDEX) Active Galactic Nuclei Catalog: The Fourth Data Release
Finkelstein, Steven L.; Schneider, Donald P.; Gebhardt, Karl +6 more
We present the active galactic nuclei (AGN) catalog from the fourth data release (HDR4) of the Hobby–Eberly Telescope Dark Energy Experiment Survey (HETDEX). HETDEX is an untargeted spectroscopic survey. HDR4 contains 345,874 Integral Field Unit observations from 2017 January to 2023 August covering an effective area of 62.9 deg2. With …
Seasonal and Short Timescale Changes on the Martian Surface: Multi-Spacecraft Perspectives
Thomas, N.; Schmidt, F.; Tirsch, D. +7 more
The continued operation of missions such as Mars Express, Mars Reconnaissance Orbiter, and the ExoMars Trace Gas Orbiter has greatly enhanced our knowledge of seasonal processes on Mars. The most apparent evidence of the importance of seasons on Mars on the large scale is annual variation in the sizes of the Martian polar caps. However, high resol…