Search Publications
Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): PDS 111, an old T Tauri star with a young-looking disk
Mamajek, Eric; Ménard, François; Huang, Jane +20 more
Context. The interplay between T Tauri stars and their circumstellar disks, and how this impacts the onset of planet formation has yet to be established. In the last years, major progress has been made using instrumentation that probes the dust structure in the mid-plane and at the surface of protoplanetary disks. Observations show a great variety…
Discovery of spin-phase-dependent QPOs in the supercritical accretion regime from the X-ray pulsar RX J0440.9+4431
Bozzo, Enrico; Falanga, Maurizio; Malacaria, Christian +5 more
RX J0440.9+4431 is an accreting X-ray pulsar (XRP) that remained relatively unexplored until recently, when major X-ray outburst activity enabled more in-depth studies. Here, we report on the discovery of ~0.2 Hz quasi-periodic oscillations (QPOs) from this source observed with Fermi-GBM. The appearance of QPOs in RX J0440.9+4431 is triple transie…
Dynamic acceleration of energetic protons by an interplanetary collisionless shock
Wang, W.; Wang, L.; Rodríguez-Pacheco, J. +8 more
Context. Interplanetary collisionless shocks are known to be capable of accelerating charged particles up to hundreds of MeV. However, the underlying acceleration mechanisms are still under debate.
Aims: We present the dynamic behaviors of energetic protons that are accelerated by an interplanetary shock that was observed with unprecedented h…
Identifying synergies between VLBI and STIX imaging
Massa, Paolo; Müller, Hendrik; Mus, Alejandro +2 more
Context. Reconstructing an image from noisy, sparsely sampled Fourier data is an ill-posed inverse problem that occurs in a variety of subjects within science, including data analysis for Very Long Baseline Interferometry (VLBI) and the Spectrometer/Telescope for Imaging X-rays (STIX) with respect to solar observations. The need for high-resolutio…
Characteristics and energy flux distributions of decayless transverse oscillations depending on coronal regions
Van Doorsselaere, Tom; Lim, Daye; Berghmans, David +1 more
Context. It has been proposed that the slope (δ) of the power-law distribution between the energy flux and oscillation frequency could determine whether high-frequency transverse oscillations make a dominant contribution to the heating (δ < 1). A meta-analysis of decayless transverse oscillations revealed that high-frequency oscillations potent…
Precise Fourier parameters of Cepheid radial velocity curves: Towards refining the Hertzsprung progression models
Smolec, R.; Moskalik, P.; Gorynya, N. A. +3 more
Context. Radial velocity (RV) curves of Classical Cepheids allow precise determination of the resonant periods, which in turn help to constrain fundamental parameters of these stars. The RV curves of Cepheids are also useful for identifying their pulsation modes and for distance determination using the parallax-of-pulsation method. Aims. The prima…
The largest metallicity difference in twin systems: High-precision abundance analysis of the benchmark pair Krios and Kronos
Petrucci, R.; Jofré, E.; Jaque Arancibia, M. +7 more
Aims: We conducted a high-precision differential abundance analysis of the remarkable binary system HD 240429/30 (Krios and Kronos, respectively), whose difference in metallicity is one of the highest detected to date in systems with similar components (~0.20 dex). A condensation temperature TC trend study was performed to search f…
Cataclysmic variables around the period-bounce: An eROSITA-enhanced multiwavelength catalog
Stelzer, Beate; Schwope, Axel; Muñoz-Giraldo, Daniela
Context. Cataclysmic variables (CVs) with degenerate donors that have evolved past the period minimum are predicted to make up a great portion of the CV population, namely, between 40% and 80%. However, either due to shortcomings in the models or the intrinsic faintness of these strongly evolved systems, only a few of these so-called "period-bounc…
The properties and kinematics of HCN emission across the closest starburst galaxy NGC 253 observed with ALMA
Chevance, M.; Schinnerer, E.; Klessen, R. S. +21 more
Context. Investigating molecular gas tracers, such as hydrogen cyanide (HCN), to probe higher densities than CO emission across nearby galaxies remains challenging. This is due to the large observing times required to detect HCN at a high sensitivity and spatial resolution. Although approximate kiloparsec scales of HCN maps are available for tens …
TESS photometry and CAOS spectroscopy of six eclipsing binaries with Am components
Frasca, A.; Alonso-Santiago, J.; Catanzaro, G. +1 more
In this paper, we present the results of a comprehensive study of six eclipsing binaries whose components are confirmed or suspected Am stars. By combining long-term, high-resolution Catania Astrophysical Observatory Spectropolarimeter (CAOS) spectroscopy and TESS photometry, we have been able to accurately obtain the orbital parameters of each sy…