Search Publications
Polarimetry of hydrogen-poor superluminous supernovae
Sollerman, J.; Gal-Yam, A.; Wheeler, J. C. +11 more
We present linear polarimetry for seven hydrogen-poor superluminous supernovae (SLSNe-I) of which only one has previously published polarimetric data. The best-studied event is SN 2017gci, for which we present two epochs of spectropolarimetry at +3 d and +29 d post-peak in rest frame, accompanied by four epochs of imaging polarimetry up to +108 d.…
Examining the orbital decay targets KELT-9 b, KELT-16 b, and WASP-4b, and the transit-timing variations of HD 97658 b
Alonso, R.; Deleuil, M.; Erikson, A. +87 more
Context. Tidal orbital decay is suspected to occur for hot Jupiters in particular, with the only observationally confirmed case of this being WASP-12b. By examining this effect, information on the properties of the host star can be obtained using the so-called stellar modified tidal quality factor Q*', which describes the eff…
Gaia Data Release 3. Stellar chromospheric activity and mass accretion from Ca II IRT observed by the Radial Velocity Spectrometer
Hatzidimitriou, D.; Marshall, D. J.; Andretta, V. +82 more
Context. The Gaia Radial Velocity Spectrometer (RVS) provides the unique opportunity of a spectroscopic analysis of millions of stars at medium resolution (λ/Δλ ∼ 11 500) in the near-infrared (845−872 nm). This wavelength range includes the Ca II infrared triplet (IRT) at 850.03, 854.44, and 866.45 nm, which is a good indicator of magnetic activit…
Optical and mid-infrared line emission in nearby Seyfert galaxies
Pozzi, F.; Feltre, A.; Marchetti, L. +24 more
Line ratio diagnostics provide valuable clues as to the source of ionizing radiation in galaxies with intense black hole accretion and starbursting events, such as local Seyfert galaxies or galaxies at the peak of their star formation history. We aim to provide a reference joint optical and mid-IR line ratio analysis for studying active galactic n…
Investigating the visible phase-curve variability of 55 Cnc e★
Alonso, R.; Deleuil, M.; Erikson, A. +87 more
Context. 55 Cnc e is an ultra-short period super-Earth transiting a Sun-like star. Previous observations in the optical range detected a time-variable flux modulation that is phased with the planetary orbital period, whose amplitude is too large to be explained by reflected light and thermal emission alone.
Aims: The goal of the study is to i…
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…