Search Publications
The evolution of hot Jupiters revealed by the age distribution of their host stars
Huang, Yang; Dong, Subo; Luo, A. -Li +11 more
Hot Jupiters are the first exoplanet population discovered around main-sequence stars. However, their origin and evolution remain puzzled. Using a sample with kinematic properties derived from large surveys (e.g., Gaia, LAMOST), we characterize the kinematic ages of stars hosting hot and warm/cold Jupiters, confirming the result of the previous st…
Photometry and astrometry with JWST - III. A NIRCam-Gaia DR3 analysis of the open cluster NGC 2506
Salaris, M.; Bedin, L. R.; Nardiello, D. +3 more
In the third paper of this series aimed at developing the tools for analysing resolved stellar populations using the cameras on board of the James Webb Space Telescope (JWST), we present a detailed multiband study of the 2 Gyr Galactic open cluster NGC 2506. We employ public calibration data sets collected in multiple filters to: (i) derive improv…
Tidally locked rotation of the dwarf planet (136199) Eris discovered via long-term ground-based and space photometry
Greiner, J.; Pál, A.; Marton, G. +9 more
The rotational states of the members in the dwarf planet-satellite systems in the trans-Neptunian region are determined by formation conditions and the tidal interaction between the components. These rotational characteristics serve as prime tracers of their evolution. A number of authors have claimed a very broad range of values for the rotation …
Optical/UV emission in the Tidal Disruption Event ASASSN-14li: implications of disc modelling
Wen, Sixiang; Jonker, Peter G.; Stone, Nicholas C. +2 more
We predict late-time optical/UV emission from tidal disruption events (TDEs) from our slim accretion disc model (Wen et al. 2020) and explore the impact of the black hole mass M•, black hole spin a•, and accretion disc size. We use these synthetic spectra to successfully fit the multiband Swift observations of ASASSN-14li at …
Prospects for future studies using deep imaging: analysis of individual Galactic cirrus filaments
Gontcharov, George A.; Mosenkov, Aleksandr V.; Román, Javier +6 more
The presence of Galactic cirrus is an obstacle for studying both faint objects in our Galaxy and low surface brightness extragalactic structures. With the aim of studying individual cirrus filaments in Sloan Digital Sky Survey (SDSS) Stripe 82 data, we develop techniques based on machine learning and neural networks that allow one to isolate filam…
Wide-binary Stars Formed in the Turbulent Interstellar Medium
Hwang, Hsiang-Chih; Xu, Siyao; Hamilton, Chris +1 more
The ubiquitous interstellar turbulence regulates star formation and the scaling relations between the initial velocity differences and the initial separations of stars. We propose that the formation of wide binaries with initial separations r in the range ~103 au ≲ r ≲ 105 au is a natural consequence of star formation in the …
Probing the variations in the timing of the Sun's polar magnetic field reversals through observations and surface flux transport simulations
Karak, Bidya Binay; Kumar, Pawan; Golubeva, Elena M. +2 more
The polar field reversal is a crucial process in the cyclic evolution of the large-scale magnetic field of the Sun. Various important characteristics of a solar cycle, such as its duration and strength, and also the cycle predictability, are determined by the polar field reversal time. While the regular measurements of solar magnetic field have be…
The large molecular gas fraction of post-starburst galaxies at z > 1
Zanella, A.; Valentino, F.; Magdis, G. +3 more
Post-starburst galaxies are sources that had the last major episode of star formation about 1 Gyr before the epoch of the observations and are on their way to quiescence. It is important to study such galaxies at redshift z > 1, during their main quenching phase, and estimate their molecular gas content to constrain the processes responsible fo…
Panning for gold, but finding helium: Discovery of the ultra-stripped supernova SN 2019wxt from gravitational-wave follow-up observations
Beswick, R.; Covino, S.; D'Avanzo, P. +101 more
We present the results from multi-wavelength observations of a transient discovered during an intensive follow-up campaign of S191213g, a gravitational wave (GW) event reported by the LIGO-Virgo Collaboration as a possible binary neutron star merger in a low latency search. This search yielded SN 2019wxt, a young transient in a galaxy whose sky po…
Kinetic Alfven wave (KAW) eigenmode in magnetosphere magnetic reconnection
Wang, Chi; Dai, Lei
One prominent signature of collisionless magnetic reconnection in the magnetosphere is the Hall effect. In the ion-scale region of reconnection, ions cannot follow the magnetic field line whereas electrons are still magnetized. The difference in the motions of electrons and ions leads to charge separation, the resulting transverse Hall electric fi…