Search Publications
Undersampling effects on observed periods of coronal oscillations
Gao, Yuhang; Van Doorsselaere, Tom; Lim, Daye +3 more
Context. Recent observations of decayless transverse oscillations have revealed two branches in the relationship between period and loop length. One is a linear relationship, interpreted as a standing mode, while the other shows almost no correlation and has not yet been interpreted conclusively. Aims. We investigated the undersampling effect on o…
Planet-star interactions with precise transit timing: IV. Probing the regime of dynamical tides for GK host stars
Casanova, V.; Fernández, M.; Maciejewski, G. +3 more
Context. Giant exoplanets on 1-3 day orbits, known as ultra-hot Jupiters, induce detectable tides in their host stars. The energy of those tides dissipates at a rate related to the properties of the stellar interior. At the same time, a planet loses its orbital angular momentum and spirals into the host star. The decrease in the orbital period is …
Nonparametric Bayesian reconstruction of Galactic magnetic fields using information field theory: The inclusion of line-of-sight information in ultrahigh-energy cosmic-ray backtracing
Enßlin, Torsten; Edenhofer, Gordian; Pavlidou, Vasiliki +4 more
Context. Ultrahigh-energy cosmic rays (UHECRs) are charged particles with energies surpassing 1018 eV. Their sources remain elusive because they are obscured by deflections caused by the Galactic magnetic field (GMF). This challenge is further complicated by our limited understanding of the 3D structure of the GMF because current GMF ob…
Element abundances of galactic RGB stars in the APO-K2 catalogue: Dissimilarity in the scaling with [α/Fe]
Valle, G.; Dell'Omodarme, M.; Prada Moroni, P. G. +1 more
Aims. We conducted an investigation on the chemical abundances of 4316 stars in the red giant branch (RGB) phase from the recently released APO-K2 catalogue. Our aim was to characterize the abundance trends of the single elements with [α/Fe], mainly focusing on C, N, and O, which are the most relevant for the estimation of stellar ages. Methods. T…
A patchy CO2 exosphere on Ganymede revealed by the James Webb Space Telescope
Leblanc, François; de Pater, Imke; Wong, Michael H. +25 more
Jupiter's icy moon Ganymede has a tenuous exosphere produced by sputtering and possibly sublimation of water ice. To date, only atomic hydrogen and oxygen have been directly detected in this exosphere. Here, we present observations of Ganymede's CO2 exosphere obtained with the James Webb Space Telescope. CO2 gas is observed o…
Determining the dynamical age of the LMC globular cluster NGC 1835 using the `dynamical clock'. Star density profile and blue straggler stars
Vesperini, Enrico; Cadelano, Mario; Pallanca, Cristina +5 more
In the context of the study of the size-age relationship observed in star clusters in the Large Magellanic Cloud (LMC) and the investigation of its origin, we present the determination of the structural parameters and the dynamical age of the massive cluster NGC 1835. We used the powerful combination of optical and near-ultraviolet images acquired…
Fast X-ray/IR observations of the black hole transient Swift J1753.5–0127: From an IR lead to a very long jet lag
Melandri, A.; Maccarone, T. J.; Altamirano, D. +16 more
We report two epochs of simultaneous near-infrared (IR) and X-ray observations of the low-mass X-ray binary black hole candidate Swift J1753.5–0127 with a subsecond time resolution during its long 2005–2016 outburst. Data were collected strictly simultaneously with VLT/ISAAC (KS band, 2.2 µm) and RXTE (2–15 keV) or XMM-Newton (0.7…
A multi-wavelength study of Galactic H II regions with extended emission
Wyrowski, Friedrich; Menten, Karl M.; Dzib, Sergio A. +9 more
Context. H II regions are the signposts of massive (M ≥ 8 M⊙) star-forming sites in our Galaxy. It has been observed that the ionizing photon rate inferred from the radio continuum emission of H II regions is significantly lower (~90%) than that inferred from far-infrared fluxes measured by the Infrared Astronomical Satellite. Aims. Thi…
Winds of change: The nuclear and galaxy-scale outflows and the X-ray variability of 2MASS 0918+2117
Buchner, J.; Merloni, A.; Vignali, C. +21 more
Context. In this work, we test feedback propagation models on the test case of 2MASS 0918+2117 (2M0918), a z = 0.149 X-ray variable AGN that shows tentative evidence for nuclear ultra-fast outflows (UFOs) in a 2005 XMM-Newton observation. We also investigate whether UFOs can be related to the observed X-ray variability.
Aims: We observed 2M09…
Evidence for magnetic boundary layer accretion in RU Lup: A spectrophotometric analysis
Alcalá, J. M.; Manara, C. F.; Frasca, A. +9 more
Context. It is well established that classical T Tauri stars accrete material from a circumstellar disk through magnetic fields. However, the physics regulating the processes in the inner (0.1 AU) disk is still not well understood. Aims. Our aim is to characterize the accretion process of the classical T Tauri Star RU Lup. Methods. Optical high-re…