Search Publications
Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distances
Woch, J.; Solanki, S. K.; Schou, J. +31 more
Aims: We use wavefront sensing to characterise the image quality of the High Resolution Telescope (HRT) of the Polarimetric and Helioseismic Imager (SO/PHI) data products during the second remote sensing window of the Solar Orbiter (SO) nominal mission phase. Our ultimate aims are to reconstruct the HRT data by deconvolving with the HRT point…
Simultaneous and panchromatic observations of the fast radio burst FRB 20180916B
Palazzi, E.; Frontera, F.; Orlandini, M. +47 more
Aims. Fast radio bursts are bright radio transients whose origins are not yet understood. The search for a multi-wavelength counterpart of those events can set a tight constraint on the emission mechanism and the progenitor source. Methods. We conducted a multi-wavelength observational campaign on FRB 20180916B between October 2020 and August 2021…
Analysing spectral lines in Gaia low-resolution spectra
Jordi, C.; Fabricius, C.; Carrasco, J. M. +1 more
Context. With its third data release, European Space Agency's Gaia mission has published the first set of low-resolution spectra for a large number of celestial objects. However, these spectra differ in their nature from typical spectroscopic data, as they do not consist of wavelength samples with associated flux values. Instead, they are represen…
The intense production of silicates during the final AGB phases of intermediate mass stars
Dell'Agli, F.; Ventura, P.; Fabrizio, M. +7 more
Context. The formation of silicates in circumstellar envelopes of stars evolving through the asymptotic giant branch (AGB) is still highly debated given the uncertainties affecting stellar evolution modelling, the description of the dust formation process, and the capability of silicate grains to accelerate stellar outflows via radiation pressure.…
Innovative technique for separating proton core, proton beam, and alpha particles in solar wind 3D velocity distribution functions
Fedorov, A.; Livi, S.; Louarn, P. +10 more
Context. The identification of proton core, proton beam, and alpha particles in solar wind ion measurements is usually performed by applying specific fitting procedures to the particle energy spectra. In many cases, this turns out to be a challenging task due to the overlapping of the curves.
Aims: We propose an alternative approach based on …
Euclid preparation. XXVII. A UV-NIR spectral atlas of compact planetary nebulae for wavelength calibration
Altieri, B.; Cimatti, A.; Aghanim, N. +201 more
The Euclid mission will conduct an extragalactic survey over 15 000 deg2 of the extragalactic sky. The spectroscopic channel of the Near-Infrared Spectrometer and Photometer (NISP) has a resolution of R ~ 450 for its blue and red grisms that collectively cover the 0.93-1.89 µm range. NISP will obtain spectroscopic redshifts for 3 × 10
CHEOPS and TESS view of the ultra-short-period super-Earth TOI-561 b
Alonso, R.; Deleuil, M.; Erikson, A. +75 more
Context. Ultra-short-period planets (USPs) are a unique class of super-Earths with an orbital period of less than a day, and hence they are subject to intense radiation from their host star. These planets cannot retain a primordial H/He atmosphere, and most of them are indeed consistent with being bare rocky cores. A few USPs, however, show eviden…
Constraints on (2060) Chiron's size, shape, and surrounding material from the November 2018 and September 2019 stellar occultations
Colas, F.; Sicardy, B.; Gomes-Júnior, A. R. +24 more
Context. After the discovery of rings around the largest known Centaur object, (10199) Chariklo, we carried out observation campaigns of stellar occultations produced by the second-largest known Centaur object, (2060) Chiron, to better characterize its physical properties and presence of material on its surroundings.
Aims: We aim to provide c…
TOI-179: A young system with a transiting compact Neptune-mass planet and a low-mass companion in outer orbit
Marzari, F.; Girard, J.; Sozzetti, A. +29 more
Context. Transiting planets around young stars are key benchmarks for our understanding of planetary systems. One such candidate, TOI-179, was identified around the K dwarf HD 18599 by TESS.
Aims: We present the confirmation of the transiting planet and the characterization of the host star and of the TOI-179 system over a broad range of angu…
Phenomenological modelling of the Crab Nebula's broadband energy spectrum and its apparent extension
Horns, D.; Dirson, L.
Context. The Crab Nebula emits exceptionally bright non-thermal radiation across the entire wavelength range from the radio to the most energetic photons. So far, the underlying physical model of a relativistic wind from the pulsar terminating in a hydrodynamic standing shock has remained fairly unchanged since the early 1970s when it was first in…