Search Publications
Mass-loss along the red giant branch in 46 globular clusters and their multiple populations
Milone, A. P.; Cordoni, G.; Marino, A. F. +7 more
The location of Galactic globular clusters' (GC) stars on the horizontal branch (HB) should mainly depend on GC metallicity, the 'first parameter', but it is actually the result of complex interactions between the red giant branch (RGB) mass-loss, the coexistence of multiple stellar populations with different helium content, and the presence of a …
The eye of Gaia on globular clusters structure: tidal tails
Sollima, A.
I analyse the projected density distribution of member stars over a wide area surrounding 18 Galactic globular clusters using the photometric and astrometric information provided by the second data release of the Gaia mission. A 5D mixture modelling technique has been employed to optimally isolate the signal of the cluster stellar population from …
The Pristine Inner Galaxy Survey (PIGS) II: Uncovering the most metal-poor populations in the inner Milky Way
Lewis, Geraint F.; Cohen, Roger E.; Simpson, Jeffrey D. +19 more
Metal-poor stars are important tools for tracing the early history of the Milky Way, and for learning about the first generations of stars. Simulations suggest that the oldest metal-poor stars are to be found in the inner Galaxy. Typical bulge surveys, however, lack low metallicity ( $\rm {[Fe/H]} \lt -1.0$ ) stars because the inner Galaxy is pred…
Photometry of high-redshift blended galaxies using deep learning
Castellano, Marco; Huertas-Company, Marc; Merlin, Emiliano +12 more
The new generation of deep photometric surveys requires unprecedentedly precise shape and photometry measurements of billions of galaxies to achieve their main science goals. At such depths, one major limiting factor is the blending of galaxies due to line-of-sight projection, with an expected fraction of blended galaxies of up to 50 per cent. Thi…
The LX-Luv-Lradio relation and corona-disc-jet connection in optically selected radio-loud quasars
Brandt, W. N.; Xue, Y. Q.; Luo, B. +3 more
Radio-loud quasars (RLQs) are more X-ray luminous than predicted by the X-ray-optical/UV relation (i.e. $L_\mathrm{x}\propto L_\mathrm{uv}^\gamma$) for radio-quiet quasars (RQQs). The excess X-ray emission depends on the radio-loudness parameter (R) and radio spectral slope (αr). We construct a uniform sample of 729 optically selected R…
A PSF-based Approach to TESS High quality data Of Stellar clusters (PATHOS) - II. Search for exoplanets in open clusters of the Southern ecliptic hemisphere and their frequency
Deleuil, M.; Bedin, L. R.; Montalto, M. +7 more
The scope of the project 'A PSF-based Approach to TESS High Quality data Of Stellar clusters' (PATHOS) is the extraction and analysis of high-precision light curves of stars in stellar clusters and young associations for the identification of candidate exoplanets and variable stars. The cutting-edge tools used in this project allow us to measure t…
SN 2018zd: an unusual stellar explosion as part of the diverse Type II Supernova landscape
Filippenko, Alexei V.; Kriskovics, L.; Pál, A. +29 more
We present extensive observations of SN 2018zd covering the first ∼450 d after the explosion. This SN shows a possible shock-breakout signal ∼3.6 h after the explosion in the unfiltered light curve, and prominent flash-ionization spectral features within the first week. The unusual photospheric temperature rise (rapidly from ∼12 000 to above 18 00…
Bipolar planetary nebulae from outflow collimation by common envelope evolution
Frank, Adam; Balick, Bruce; De Marco, Orsola +8 more
The morphology of bipolar planetary nebulae (PNe) can be attributed to interactions between a fast wind from the central engine and the dense toroidal-shaped ejecta left over from common envelope (CE) evolution. Here we use the 3D hydrodynamic adaptive mesh refinement (AMR) code ASTROBEAR to study the possibility that bipolar PN outflows can emerg…
WASP-186 and WASP-187: two hot Jupiters discovered by SuperWASP and SOPHIE with additional observations by TESS
Bouchy, F.; Collier Cameron, A.; Wilson, T. G. +15 more
We present the discovery of two new hot Jupiters identified from the Wide-Angle Search for Planets (WASP) survey, WASP-186b and WASP-187b (TOI-1494.01 and TOI-1493.01). Their planetary nature was established from SOPHIE spectroscopic observations, and additional photometry was obtained from Transiting Exoplanet Survey Satellite. Stellar parameters…
The STRong lensing Insights into the Dark Energy Survey (STRIDES) 2017/2018 follow-up campaign: discovery of 10 lensed quasars and 10 quasar pairs
Smith, M.; Abbott, T. M. C.; Allam, S. +65 more
We report the results of the STRong lensing Insights into the Dark Energy Survey (STRIDES) follow-up campaign of the late 2017/early 2018 season. We obtained spectra of 65 lensed quasar candidates with ESO Faint Object Spectrograph and Camera 2 on the NTT and Echellette Spectrograph and Imager on Keck, confirming 10 new lensed quasars and 10 quasa…