Search Publications
Gaia21blx: Complete resolution of a binary microlensing event in the Galactic disk
Rybicki, K. A.; Wyrzykowski, Ł.; Snodgrass, C. +24 more
Context. Gravitational microlensing is a method that is used to discover planet-hosting systems at distances of several kiloparsec in the Galactic disk and bulge. We present the analysis of a microlensing event reported by the Gaia photometric alert team that might have a bright lens.
Aims: In order to infer the mass and distance to the lensi…
High-resolution transmission spectroscopy of the hot-Saturn HD 149026b
Haardt, Francesco; Rainer, Monica; Borsa, Francesco +1 more
Advances in modern technology have enabled the characterization of exoplanetary atmospheres, which can be achieved by exploitation of the transmission spectroscopy technique. We performed visible (VIS) and near-infrared (NIR) high-resolution spectroscopic observations of one transit of HD 149026b, a close-in orbit sub-Saturn exoplanet by using the…
The high-energy cyclotron line in 2S 1417-624 discovered with Insight-HXMT during the 2018 outburst
Wang, W.; Santangelo, A.; Serim, M. M. +7 more
We report a detailed timing and spectral analysis of the X-ray pulsar 2S 1417‑624 using the data from Insight-HXMT during the 2018 outburst. The pulse profiles are highly variable with respect to both unabsorbed flux and energy. A double-peaked pulse profile from the low flux evolved to a multi-peaked shape in the high-flux state. The pulse fracti…
Multiple-scale gas infall through gravity torques on Milky Way twins
Combes, Françoise; da Silva, Patrícia
One of the main problems raised by the feeding of super-massive black holes (SMBHs) at the centres of galaxies is the huge angular momentum of the circumnuclear gas and of the gas reservoir in the galaxy disk. Because viscous torques are not efficient at kiloparsec or 100 pc scales, the angular momentum must be exchanged through gravity torques th…
A3COSMOS: Dissecting the gas content of star-forming galaxies across the main sequence at 1.2 ≤ z < 1.6
Schinnerer, Eva; Liu, Daizhong; Bertoldi, Frank +5 more
Aims: We aim to understand the physical mechanisms that drive star formation in a sample of mass-complete (>109.5 M⊙) star-forming galaxies (SFGs) at 1.2 ≤ ɀ < 1.6.
Methods: We selected SFGs from the COSMOS2020 catalog and applied a uυ-domain stacking analysis to their archival Atacama Large Millimeter/submill…
An X-ray flaring event and a variable soft X-ray excess in the Seyfert LCRS B040659.9–385922 as detected with eROSITA
Reichart, D. E.; Gromadzki, M.; Liu, Z. +13 more
Context. Extreme continuum variability in extragalactic nuclear sources can indicate extreme changes in accretion flows onto supermassive black holes. Aims. We explore the multiwavelength nature of a continuum flare in the Seyfert LCRS B040659.9‑385922. The all-sky X-ray surveys conducted by the Spectrum Roentgen Gamma (SRG)/extended ROentgen Surv…
Runaway BN supergiant star HD 93840: Progenitor of an imminent core-collapse supernova above the Galactic plane
Butler, K.; Weßmayer, D.; Przybilla, N. +1 more
We present a quantitative spectral analysis of the extreme nitrogen-enhanced supergiant HD 93840 (BN1 Ib) at an intermediate galactic latitude. Based on an optical high-resolution spectrum and complementary ultraviolet and infrared (spectro-)photometry, in addition to Gaia data, we carried out a full characterisation of the star's properties. We u…
Toroidal modified Miller-Turner CME model in EUHFORIA: Validation and comparison with flux rope and spheromak
Magdalenić, J.; Poedts, S.; Maharana, A. +1 more
Context. Rising concerns about the impact of space-weather-related disruptions demand modelling and reliable forecasting of coronal mass ejection (CME) impacts. Aims. In this study, we demonstrate the application of the modified Miller-Turner (mMT) model implemented within EUropean Heliospheric FORecasting Information Asset (EUHFORIA) in forecasti…
First deep search of tidal tails in the Milky Way globular cluster NGC 6362
Piatti, Andrés E.
I present results of the analysis of a set of images obtained in the field of the Milky Way globular cluster NGC 6362 using the Dark Energy Camera, which is mounted in the 4.0 m Victor Blanco telescope of the Cerro-Tololo Interamerican Observatory. The cluster was selected as a science case for deep high-quality photometry because of the controver…
Derivation of a generalized Kappa distribution from the scaling properties of solar wind magnetic field fluctuations at kinetic scales
Consolini, Giuseppe; Benella, Simone; Belardinelli, Daniele +1 more
Context. Kinetic-scale dynamics in weakly collisional space plasmas usually exhibits a self-similar statistics of magnetic field fluctuations. This implies the existence of an invariant probability density function (master curve). Aims. We provide an analytical derivation of the master curve by assuming that perpendicular fluctuations can be model…