Search Publications
The GAPS Programme at TNG. XLII. A characterisation study of the multi-planet system around the 400 Myr-old star HD 63433 (TOI-1726)
Baratella, M.; Mallonn, M.; Scandariato, G. +34 more
Context. The GAPS collaboration is carrying out a spectroscopic and photometric follow-up of a sample of young stars with planets (age ≲600 Myr) to characterise planetary systems at the early stages of their evolution.
Aims: For more than 2 yr, we monitored with the HARPS-N spectrograph the 400 Myr-old star HD 63433, which hosts two close-in …
Gaia Data Release 3. The first Gaia catalogue of variable AGN
Gavras, Panagiotis; Audard, Marc; Clementini, Gisella +15 more
Context. One of the novelties of Gaia data release 3 (DR3) with respect to the previous data releases is the publication of the multiband light curves for about 1 million active galactic nuclei (AGN) and of the values of some parameters characterising their variability properties.
Aims: The goal of this work is the creation of a catalogue of …
High-angular-resolution NIR view of the Orion Bar revealed by Keck/NIRC2
Le Gal, Romane; Bron, Emeric; Wolfire, Mark G. +7 more
Context. Nearby photo-dissociation regions (PDRs), where the gas and dust are heated by the far-ultraviolet (FUV) irradiation emitted from stars, are ideal templates with which to study the main stellar feedback processes.
Aims: With this study, we aim to probe the detailed structures at the interfaces between ionized, atomic, and molecular g…
The geometric albedo of the hot Jupiter HD 189733b measured with CHEOPS
Guterman, P.; Alonso, R.; Deleuil, M. +84 more
Context. Measurements of the occultation of an exoplanet at visible wavelengths allow us to determine the reflective properties of a planetary atmosphere. The observed occultation depth can be translated into a geometric albedo. This in turn aids in characterising the structure and composition of an atmosphere by providing additional information o…
A three-component giant radio halo: The puzzling case of the galaxy cluster Abell 2142
Brunetti, G.; Rossetti, M.; De Grandi, S. +16 more
Context. Turbulence introduced into the intracluster medium (ICM) through cluster-merger events transfers energy to non-thermal components, and can trigger the formation of diffuse synchrotron radio sources. Typical diffuse sources in the form of giant radio halos and mini-halos are found in merging and relaxed cool-core galaxy clusters, respectiv…
The extremely high albedo of LTT 9779 b revealed by CHEOPS. An ultrahot Neptune with a highly metallic atmosphere
Deleuil, M.; Scandariato, G.; Hoyer, S. +11 more
Context. Optical secondary eclipse measurements of small planets can provide a wealth of information about the reflective properties of these worlds, but the measurements are particularly challenging to attain because of their relatively shallow depth. If such signals can be detected and modeled, however, they can provide planetary albedos, therma…
First results from the Solar Orbiter Heavy Ion Sensor
Fedorov, A.; Livi, S.; Wurz, P. +30 more
Aims: Solar Orbiter launched in February 2020 with the goal of revealing the connections between the Sun's interior, atmosphere, and the heliosphere. The Solar Orbiter Heavy Ion Sensor (HIS) is a time-of-flight ion mass spectrometer dedicated to measuring heavy ions in the solar wind.
Methods: We present an overview of the first measurem…
Protoplanetary disks in Ks-band total intensity and polarized light
Ren, Bin B.; Ménard, François; Bae, Jaehan +11 more
Context. The diverse morphology among protoplanetary disks may result from planet-disk interactions, suggesting the presence of planets undergoing formation. The characterization of disks can provide information on the formation environments of planets. To date, most imaging campaigns have probed the polarized light from disks, which is only a fra…
A kinematically detected planet candidate in a transition disk
Testi, L.; Ansdell, M.; Facchini, S. +10 more
Context. Transition disks are protoplanetary disks with inner cavities possibly cleared by massive companions. Observing them at high resolution is ideal for mapping their velocity structure and probing companion-disk interactions.
Aims: We present Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 dust and gas observations of the tra…
Planetary system around LTT 1445A unveiled by ESPRESSO: Multiple planets in a triple M-dwarf system
Bouchy, F.; Rebolo, R.; Allende Prieto, C. +32 more
We present radial velocity follow-up obtained with ESPRESSO of the M-type star LTT 1445A (TOI-455), for which a transiting planet b with an orbital period of 5.4 days was detected by TESS. We report the discovery of a second transiting planet (LTT 1445A c) and a third non-transiting candidate planet (LTT 1445A d) with orbital periods of 3.12 and 2…