Search Publications
Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS. II. Discovery of two new GW Vir stars: TIC 333432673 and TIC 095332541
Werner, K.; Kepler, S. O.; Althaus, L. G. +8 more
Context. The Transiting Exoplanet Survey Satellite (TESS) mission is revolutionizing the blossoming area of asteroseismology, particularly of pulsating white dwarfs and pre-white dwarfs, thus continuing the impulse of its predecessor, the Kepler mission.
Aims: In this paper, we present the observations from the extended TESS mission in both 1…
Observations of a prominence eruption and loop contraction
Joshi, Bhuwan; Schmieder, Brigitte; Joshi, Reetika +3 more
Context. Prominence eruptions provide key observations to understand the launch of coronal mass ejections as their cold plasma traces a part of the unstable magnetic configuration.
Aims: We select a well observed case to derive observational constraints for eruption models.
Methods: We analyze the prominence eruption and loop expansion a…
Simultaneous X-ray and radio observations of the transitional millisecond pulsar candidate CXOU J110926.4-650224. The discovery of a variable radio counterpart
Campana, S.; de Martino, D.; Rea, N. +15 more
We present the results of simultaneous observations of the transitional millisecond pulsar (tMSP) candidate
The RR Lyrae projected density distribution from the Galactic centre to the halo
Minniti, Dante; Ripepi, Vincenzo; Alonso-García, Javier +4 more
The projected density distribution of type ab RR Lyrae (RRab) stars was characterised from the innermost regions of the Milky Way to the halo, with the aim of placing constraints on the Galaxy's evolution. The compiled sample (NRRab = 64 850) stems from fundamental mode RR Lyrae variables identified by the VVV, OGLE, and Gaia surveys. T…
The Fornax3D project: Planetary nebulae catalogue and independent distance measurements to Fornax cluster galaxies
Viaene, S.; Morelli, L.; Pinna, F. +17 more
Extragalactic planetary nebulae (PNe) offer a way to determine the distance to their host galaxies thanks to the nearly universal shape of the planetary nebulae luminosity function (PNLF). Accurate PNe distance measurements rely on obtaining well-sampled PNLFs and the number of observed PNe scales with the encompassed stellar mass. This means eith…
Determining the source and eruption dynamics of a stealth CME using NLFFF modelling and MHD simulations
Yardley, S. L.; Pagano, P.; Mackay, D. H. +1 more
Context. Coronal mass ejections (CMEs) that exhibit weak or no eruption signatures in the low corona, known as stealth CMEs, are problematic as upon arrival at Earth they can lead to geomagnetic disturbances that were not predicted by space weather forecasters.
Aims: We investigate the origin and eruption of a stealth event that occurred on 2…
The variable absorption in the X-ray spectrum of GRB 190114C
Perna, Rosalba; Campana, Sergio; Lazzati, Davide +2 more
Gamma-ray burst (GRB) 190114C was a bright burst that occurred in the local Universe (z = 0.425). It was the first GRB ever detected at teraelectronvolt (TeV) energies, and this was thanks to MAGIC. We characterize the ambient medium properties of the host galaxy through the study of the absorbing X-ray column density. Using a combination of Swift…
Towards a fully consistent Milky Way disk model. IV. The impact of Gaia DR2 and APOGEE
Just, A.; Sysoliatina, K.
Aims: We present an updated version of the semi-analytic Just-Jahrei (JJ) model of the Galactic disk and constrain its parameters in the Solar neighbourhood.
Methods: The new features of the JJ model include a simple two-component gaseous disk, a star-formation rate (SFR) function of the thick disk that has been extended in time, and a c…
Description of turbulent dynamics in the interstellar medium: multifractal-microcanonical analysis. I. Application to Herschel observations of the Musca filament
Schneider, N.; Bontemps, S.; Elia, D. +10 more
Observations of the interstellar medium (ISM) show a complex density and velocity structure, which is in part attributed to turbulence. Consequently, the multifractal formalism should be applied to observation maps of the ISM in order to characterize its turbulent and multiplicative cascade properties. However, the multifractal formalism, even in …
Four Jovian planets around low-luminosity giant stars observed by the EXPRESS and PPPS
Jones, M. I.; Trifonov, T.; Soto, M. G. +14 more
We report the discovery of planetary companions orbiting four low-luminosity giant stars with M⋆ between 1.04 and 1.39 M⊙. All four host stars have been independently observed by the EXoPlanets aRound Evolved StarS (EXPRESS) program and the Pan-Pacific Planet Search (PPPS). The companion signals were revealed by multi-epoch p…