Search Publications
The GAPS Programme with HARPS-N at TNG. XVIII. Two new giant planets around the metal-poor stars HD 220197 and HD 233832
Scandariato, G.; Pagano, I.; Poretti, E. +40 more
Context. Statistical studies of exoplanets have shown that giant planets are more commonly hosted by metal-rich dwarf stars than low-metallicity stars, while no such correlation is evident for lower mass planets. The search for giant planets around metal-poor stars and the estimate of their occurrence fp is an important element in provi…
Multi-scale analysis of the Monoceros OB 1 star-forming region. I. The dense core population
Sanhueza, Patricio; Soam, Archana; Doi, Yasuo +24 more
Context. Current theories and models attempt to explain star formation globally, from core scales to giant molecular cloud scales. A multi-scale observational characterisation of an entire molecular complex is necessary to constrain them. We investigate star formation in G202.3+2.5, a ∼10 × 3 pc sub-region of the Monoceros OB1 cloud with a complex…
Comparing extrapolations of the coronal magnetic field structure at 2.5 R⊙ with multi-viewpoint coronagraphic observations
Sasso, C.; Romoli, M.; Andretta, V. +19 more
The magnetic field shapes the structure of the solar corona, but we still know little about the interrelationships between the coronal magnetic field configurations and the resulting quasi-stationary structures observed in coronagraphic images (such as streamers, plumes, and coronal holes). One way to obtain information on the large-scale structur…
Diurnal variation of dust and gas production in comet 67P/Churyumov-Gerasimenko at the inbound equinox as seen by OSIRIS and VIRTIS-M on board Rosetta
Lamy, P. L.; Lara, L. M.; Bertaux, J. -L. +53 more
Context. On 27 April 2015, when comet 67P/Churyumov-Gerasimenko was at 1.76 au from the Sun and moving toward perihelion, the OSIRIS and VIRTIS-M instruments on board the Rosetta spacecraft simultaneously observed the evolving dust and gas coma during a complete rotation of the comet.
Aims: We aim to characterize the spatial distribution of d…
Spectral analysis of the dipping LMXB system XB 1916-053
Sanna, A.; Di Salvo, T.; Burderi, L. +6 more
Context. XB 1916-053 is a low mass X-ray binary system (LMXB) hosting a neutron star (NS) and showing periodic dips. The spectrum of the persistent emission was modeled with a blackbody component having a temperature between 1.31 and 1.67 keV and with a Comptonization component with an electron temperature of 9.4 keV and a photon index Γ between 2…
The coronal temperature of NGC 4388 and NGC 2110 measured with INTEGRAL
Bird, A. J.; Ubertini, P.; Malizia, A. +4 more
Aims: We aim to measure the physical properties of the hot X-ray corona of two active galactic nuclei, NGC 4388 and NGC 2110.
Methods: We analysed the hard X-ray (20-300 keV) INTEGRAL spectrum in conjunction with archival XMM-Newton and NuSTAR data.
Results: The X-ray spectrum of both sources is phenomenologically well described by …
Ground-based infrared mapping of H2O2 on Mars near opposition
Aoki, S.; Daerden, F.; Neary, L. +12 more
We pursued our ground-based seasonal monitoring of hydrogen peroxide on Mars using thermal imaging spectroscopy, with two observations of the planet near opposition, in May 2016 (solar longitude Ls = 148.5°, diameter = 17 arcsec) and July 2018 (Ls = 209°, diameter = 23 arcsec). Data were recorded in the 1232-1242 cm-1 range (8.1 µ…
Some relationships between radiative and atmospheric quantities through 1D NLTE modeling of prominences in the Mg II lines
Vial, J. -C.; Zhang, P.; Buchlin, É.
Context. With more than four years of IRIS observations, and in order to avoid building customized diagnostics for each observation, it is useful to derive some simple relations between spectra and physical quantities. This is even more useful for the k and h lines of Mg II, which require complex non-local-thermodynamic-equilibrium NLTE treatments…
Hubble Space Telescope photometry of multiple stellar populations in the inner parts of NGC 2419
Hernandez, Svea; Brodie, Jean; Larsen, Søren S. +2 more
We present new deep imaging of the central regions of the remote globular cluster NGC 2419, obtained with the F343N and F336W filters of the Wide Field Camera 3 on board the Hubble Space Telescope. The new data are combined with archival imaging to constrain nitrogen and helium abundance variations within the cluster. We find a clearly bimodal dis…
Gaia GraL: Gaia DR2 gravitational lens systems. IV. Keck/LRIS spectroscopic confirmation of GRAL 113100-441959 and model prediction of time delays
Djorgovski, S. G.; Stern, D.; Surdej, J. +17 more
We report the spectroscopic confirmation and modeling of the quadruply imaged quasar GRAL 113100-441959, the first gravitational lens (GL) to be discovered from a machine learning technique that only relies on the relative positions and fluxes of the observed images without considering colour informations. Follow-up spectra obtained with Keck/LRIS…