Search Publications
Statistical study of electron density turbulence and ion-cyclotron waves in the inner heliosphere: Solar Orbiter observations
Maksimovic, M.; Bale, S. D.; Chust, T. +27 more
Context. The recently released spacecraft potential measured by the RPW instrument on board Solar Orbiter has been used to estimate the solar wind electron density in the inner heliosphere.
Aims: The measurement of the solar wind's electron density, taken in June 2020, has been analysed to obtain a thorough characterization of the turbulence …
A case study of ACV variables discovered in the Zwicky Transient Facility survey
Paunzen, E.; Prišegen, M.; Faltová, N. +6 more
Context. Magnetic chemically peculiar (mCP) stars exhibit complex atmospheres that allow the investigation of the interplay of atomic diffusion, magnetic fields, and stellar rotation. A non-uniform surface distribution of chemical elements and the non-alignment of the rotational and magnetic axes result in the variability of several observables. P…
CO isotopolog line fluxes of viscously evolving disks. Cold CO conversion insufficient to explain observed low fluxes
van Dishoeck, E. F.; Rosotti, G.; Trapman, L. +2 more
Context. Protoplanetary disks are thought to evolve viscously, where the disk mass - the reservoir available for planet formation - decreases over time as material is accreted onto the central star over a viscous timescale. Observations have shown a correlation between disk mass and the stellar mass accretion rate, as expected from viscous theory.…
Solar Orbiter/RPW antenna calibration in the radio domain and its application to type III burst observations
Maksimovic, M.; Bale, S. D.; Chust, T. +18 more
Context. In order to allow for a comparison with the measurements from other antenna systems, the voltage power spectral density measured by the Radio and Plasma waves receiver (RPW) on board Solar Orbiter needs to be converted into physical quantities that depend on the intrinsic properties of the radiation itself (e.g., the brightness of the sou…
Runaway blue main-sequence stars at high Galactic latitudes. Target selection with Gaia and spectroscopic identification
Raddi, Roberto; Irrgang, Andreas; Heber, Ulrich +2 more
Context. The ESA Gaia mission is a remarkable tool for stellar population analysis through its accurate Hertzsprung-Russell diagram. Its precise astrometry has propelled detailed kinematic studies of the Milky Way and the identification of high-velocity outliers.
Aims: Motivated by the historical identification of runaway main-sequence (MS) s…
Fast flaring observed from XMMU J053108.3-690923 by eROSITA: a supergiant fast X-ray transient in the Large Magellanic Cloud
Haberl, F.; Ducci, L.; Vasilopoulos, G. +3 more
Context. Supergiant fast X-ray transients (SFXTs) are a peculiar class of supergiant high-mass X-ray binary (HMXB) systems characterised by extreme variability in the X-ray domain. In current models, this is mainly attributed to the clumpy nature of the stellar wind coupled with gating mechanisms involving the spin and magnetic field of the neutro…
The diffuse interstellar band around 8620 Å. I. Methods and application to the GIBS data set
Schultheis, M.; Recio-Blanco, A.; de Laverny, P. +6 more
Context. Diffuse interstellar bands (DIBs) are interstellar absorption features that widely exist in the optical and near-infrared wavelength range. DIBs play an important role in the lifecycle of the interstellar medium and can also be used to trace the Galactic structure.
Aims: We developed a set of procedures to automatically detect and me…
A transmission spectrum of the planet candidate WD 1856+534 b and a lower limit to its mass
Alonso, R.; Hollands, M. A.; Castro-Rodríguez, N. +7 more
The cool white dwarf WD 1856+534 was found to be transited by a Jupiter-sized object with a mass at or below 14 MJup. We used the GTC telescope to obtain and analyse the photometry and low-resolution spectroscopy of six transits of WD 1856+534 b, with the intention of deriving the slope of the transmission spectrum. Such a slope, assumi…
Solar wind rotation rate and shear at coronal hole boundaries. Possible consequences for magnetic field inversions
Lavraud, B.; Fargette, N.; Rouillard, A. P. +6 more
Context. In situ measurements by several spacecraft have revealed that the solar wind is frequently perturbed by transient structures that have been interpreted as magnetic folds, jets, waves, and flux ropes that propagate rapidly away from the Sun over a large range of heliocentric distances. Parker Solar Probe (PSP), in particular, has detected …
The CH radical at radio wavelengths: revisiting emission in the 3.3 GHz ground-state lines
Menten, Karl M.; Jacob, Arshia M.; Wiesemeyer, Helmut +1 more
Context. The intensities of the three widely observed radio-wavelength hyperfine structure (HFS) lines between the Λ-doublet components of the rotational ground state of CH are inconsistent with local thermodynamic equilibrium (LTE) and indicate ubiquitous population inversion. While this can be qualitatively understood assuming a pumping cycle th…