Search Publications
The GAPS Programme at TNG. XXI. A GIARPS case study of known young planetary candidates: confirmation of HD 285507 b and refutation of AD Leonis b
Mallonn, M.; Fantinel, D.; Scandariato, G. +67 more
Context. The existence of hot Jupiters is still not well understood. Two main channels are thought to be responsible for their current location: a smooth planet migration through the protoplanetary disk or the circularization of an initial highly eccentric orbit by tidal dissipation leading to a strong decrease in the semimajor axis. Different for…
NGC 6240: A triple nucleus system in the advanced or final state of merging
Kollatschny, W.; Monreal-Ibero, A.; Contini, T. +4 more
Aims: NGC 6240 is a well-studied nearby galaxy system in the process of merging. Based on optical, X-ray, and radio observations, it is thought to harbor two active nuclei. We carried out a detailed optical 3D spectroscopic study to investigate the inner region of this system in connection with existing MERLIN and VLBA data.
Methods: We …
Rotation-activity relations and flares of M dwarfs with K2 long- and short-cadence data
Scholz, A.; Damasso, M.; Stelzer, B. +1 more
Using light curves obtained by the K2 mission, we study the relation between stellar rotation and magnetic activity with special focus on stellar flares. Our sample comprises 56 bright and nearby M dwarfs observed by K2 during campaigns C0-C18 in long- and short-cadence mode. We derive rotation periods for 46 M dwarfs and measure photometric activ…
A hot terrestrial planet orbiting the bright M dwarf L 168-9 unveiled by TESS
Bouchy, F.; de Medeiros, J. R.; Butler, R. P. +67 more
We report the detection of a transiting super-Earth-sized planet (R = 1.39 ± 0.09 R⊕) in a 1.4-day orbit around L 168-9 (TOI-134), a bright M1V dwarf (V = 11, K = 7.1) located at 25.15 ± 0.02 pc. The host star was observed in the first sector of the Transiting Exoplanet Survey Satellite (TESS) mission. For confirmation and planet mass m…
Formation of the Musca filament: evidence for asymmetries in the accretion flow due to a cloud-cloud collision
Arzoumanian, D.; Schneider, N.; Csengeri, T. +11 more
Context. Dense molecular filaments are ubiquituous in the interstellar medium, yet their internal physical conditions and the role of gravity, turbulence, the magnetic field, radiation, and the ambient cloud during their evolution remain debated.
Aims: We study the kinematics and physical conditions in the Musca filament, the ambient cloud, a…
Unveiling the β Pictoris system, coupling high contrast imaging, interferometric, and radial velocity data
Genzel, R.; Henning, T.; Meunier, N. +85 more
Context. The nearby and young β Pictoris system hosts a well resolved disk, a directly imaged massive giant planet orbiting at ≃9 au, as well as an inner planet orbiting at ≃2.7 au, which was recently detected through radial velocity (RV). As such, it offers several unique opportunities for detailed studies of planetary system formation and early …
Full 5D characterisation of the Sagittarius stream with Gaia DR2 RR Lyrae
Castro-Ginard, A.; Helmi, A.; Antoja, T. +4 more
Context. The Sagittarius (Sgr) stream is one of the best tools that we currently have to estimate the mass and shape of our Galaxy. However, assigning membership and obtaining the phase-space distribution of the stars that form the tails of the stream is quite challenging.
Aims: Our goal is to produce a catalogue of the RR Lyrae stars of Sgr …
Measuring bulk flows of the intracluster medium in the Perseus and Coma galaxy clusters using XMM-Newton
Fabian, A. C.; Pinto, C.; Eckert, D. +7 more
We demonstrate a novel technique for calibrating the energy scale of the EPIC-pn detector on XMM-Newton, which allows us to measure bulk flows in the intracluster medium (ICM) of the Perseus and Coma galaxy clusters. The procedure uses the fluorescent instrumental background lines present in all observations, in particular, Cu-Kα. By studying thei…
Central molecular zones in galaxies: 12CO-to-13CO ratios, carbon budget, and X factors
Israel, F. P.
We present ground-based measurements of 126 nearby galaxy centers in 12CO and 92 in 13CO in various low-J transitions. More than 60 galaxies were measured in at least four lines. The average relative intensities of the first four J 12CO transitions are 1.00:0.92:0.70:0.57. In the first three J transitions, the aver…
Improving transit characterisation with Gaussian process modelling of stellar variability
Cabrera, J.; Barros, S. C. C.; Santos, N. C. +4 more
Context. New photometric space missions to detect and characterise transiting exoplanets are focusing on bright stars to obtain high cadence, high signal-to-noise light curves. Since these missions will be sensitive to stellar oscillations and granulation even for dwarf stars, they will be limited by stellar variability. Therefore, it is crucial a…