Search Publications
Modelling stellar irradiances I: the transition regions of FGKM stars
Del Zanna, G.; Deliporanidou, E.
We employed advanced ionization equilibrium models that we developed in Dufresne et al. (2024), which include charge transfer and density effects, to model UV stellar irradiances for a sample of stars. Our sample includes
Binary orbit and disks properties of the RW Aur system using ALMA observations
Dougados, C.; Facchini, S.; Manara, C. F. +8 more
Context. The dynamical interactions between young binaries can perturb the material distribution of their circumstellar disks, and modify the planet formation process. In order to understand how planets form in multiple stellar systems, it is necessary to characterize both their binary orbit and their disks properties. Aims. In order to constrain …
KBSS-InCLOSE. I. Design and First Results from the Inner Circumgalactic Medium of QSO Line-of-sight Emitting Galaxies at z ∼ 2–3
Pettini, Max; Erb, Dawn K.; Steidel, Charles C. +10 more
We present the design and first results of the inner circumgalactic medium (CGM) of QSO line-of-sight emitting galaxies at z ∼ 2–3, Keck Baryonic Structure Survey (KBSS)-InCLOSE. The survey will connect galaxy properties (e.g., stellar mass M *, interstellar medium, hereafter ISM, metallicity) with the physical conditions of the inner C…
The orbital parameters of the δ Cep inner binary system determined using 2019 HARPS-N spectroscopic data
Poretti, E.; Rainer, M.; Kervella, P. +12 more
Context. An inner companion has recently been discovered orbiting the prototype of classical Cepheids, δ Cep, whose orbital parameters are still not fully constrained.
Aims: We collected new precise radial velocity measurements of δ Cep in 2019 using the HARPS-N spectrograph mounted at the Telescopio Nazionale Galileo. Using these radial velo…
Evidence for a black hole in the historical X-ray transient A 1524-61 (= KY TrA)
Armas Padilla, M.; Monelli, M.; Muñoz-Darias, T. +5 more
We present Very Large Telescope spectroscopy, high-resolution imaging, and time-resolved photometry of KY TrA, the optical counterpart to the X-ray binary A 1524-61. We perform a refined astrometry of the field, yielding improved coordinates for KY TrA and the field star interloper of similar optical brightness that we locate 0.64 ± 0.04 arcsec SE…
Uncovering a new group of T Tauri stars in the Taurus-Auriga molecular complex from Gaia and GALEX data
Beitia-Antero, Leire; Gómez de Castro, Ana Inés; Canet, Ada +3 more
Context. Determining a complete census of young stars in any star forming region is a challenge even for the nearest and best-observed molecular clouds, such as Taurus-Auriga (TAMC). Deep surveys at infrared (IR) and X-ray wavelengths and astrometric surveys using Gaia DR2 and DR3 have been carried out to detect the sparse population and constrain…
Constraining the Number Density of the Accretion Disk Wind in Hercules X-1 Using Its Ionization Response to X-Ray Pulsations
Fabian, A. C.; Pinto, C.; Kara, E. +6 more
X-ray binaries are known to launch powerful accretion disk winds that can have a significant impact on the binary systems and their surroundings. To quantify the impact and determine the launching mechanisms of these outflows, we need to measure the wind plasma number density, an important ingredient in the theoretical disk wind models. While X-ra…
Pre-impact Albedo Map and Photometric Properties of the (65803) Didymos Asteroid Binary System from DART and Ground-based Data
Buratti, B. J.; Sunshine, J. M.; Rivkin, A. S. +11 more
This study provides a pre-impact map of the albedo of the Double Asteroid Redirection Test (DART) target Dimorphos corrected for all the effects of viewing geometry, as well as an estimate of photometric roughness for the hemisphere imaged by DART. Other photometric properties are derived for the (65803) Didymos binary system based on DART and gro…
HIP 41378 observed by CHEOPS: Where is planet d?
Alonso, R.; Deleuil, M.; Erikson, A. +84 more
HIP 41378 d is a long-period planet that has only been observed to transit twice, three years apart, with K2. According to stability considerations and a partial detection of the Rossiter-McLaughlin effect, Pd = 278.36 d has been determined to be the most likely orbital period. We targeted HIP 41378 d with CHEOPS at the predicted transi…
Multiwavelength study of on-disk coronal-hole jets with IRIS and SDO observations
Koletti, M.; Gontikakis, C.; Patsourakos, S. +1 more
Context. Solar jets are an important field of study, as they may contribute to the mass and energy transfer from the lower to the upper atmosphere. Aims. We use the Interface Region Imaging Spectrograph (IRIS) and Solar Dynamic Observatory (SDO) observations to study two small-scale jets (jet 1 and jet 2) originating in the same on-disk coronal ho…