Search Publications
Nested active regions anchor the heliospheric current sheet and stall the reversal of the coronal magnetic field
Finley, A. J.
Context. During the solar cycle, the Sun's magnetic field polarity reverses due to the emergence, cancellation, and advection of magnetic flux towards the rotational poles. Flux emergence events occasionally cluster together, although it is unclear if this is due to the underlying solar dynamo or simply by chance. Aims. Regardless of the cause, we…
Probing the inner Galactic halo with blue horizontal-branch stars. Gaia DR3-based catalogue with atmospheric and stellar parameters
Geier, S.; Heber, U.; Pelisoli, I. +4 more
Context. Stars that are found on the blue horizontal-branch (BHB) evolved from low-mass stars that have completed their core hydrogen-burning main sequence (MS) stage and undergone the helium flash at the end of their red giant phase. Hence, they are very old objects that can be used as markers in studying galactic structure and formation history.…
Diffuse interstellar bands as dust indicators: The contribution from 3D maps
Lallement, R.; Cox, N. L. J.; Vergely, J. L.
Context. Three-dimensional (3D) distributions of the 862 nm diffuse interstellar band (DIB) carrier have been computed based on Gaia parallaxes and DIB catalogues, in parallel with 3D maps of dust extinction density. Three-dimensional maps provide local diagnostics and information on the distribution of structures in addition to line-of-sight (LOS…
SO2 and OCS toward high-mass protostars: A comparative study of ice and gas
van Dishoeck, Ewine F.; Nazari, Pooneh; van Gelder, Martijn L. +2 more
Context. OCS and SO2 are both major carriers of gaseous sulfur and are the only sulfurated molecules detected in interstellar ices to date. They are thus the ideal candidates for exploring the evolution of the volatile sulfur content throughout the different stages of star formation. Aims. We aim to investigate the chemical history of i…
Effect of magnetospheric conditions on the morphology of Jupiter's ultraviolet main auroral emission as observed by Juno-UVS
Bonfond, B.; Vogt, M. F.; Gérard, J. -C. +9 more
Auroral emissions are a reflection of magnetospheric processes, and at Jupiter, it is not entirely certain how the morphology of the UV main emission (ME) varies with magnetospheric compression or the strength of the central current sheet. This work leverages the observations from Juno-UVS to link ME variability with particular magnetospheric stat…
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 …
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…
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…
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…