Search Publications
Identification and characterization of a new ensemble of cometary organic molecules
Altwegg, K.; Fuselier, S. A.; Rubin, M. +4 more
In-situ study of comet 1P/Halley during its 1986 apparition revealed a surprising abundance of organic coma species. It remained unclear, whether or not these species originated from polymeric matter. Now, high-resolution mass-spectrometric data collected at comet 67P/Churyumov-Gerasimenko by ESA's Rosetta mission unveil the chemical structure of …
A New Magnetic Parameter of Active Regions Distinguishing Large Eruptive and Confined Solar Flares
Hou, Yijun; Li, Ting; Yang, Shuhong +3 more
With the aim of investigating how the magnetic field in solar active regions (ARs) controls flare activity, i.e., whether a confined or eruptive flare occurs, we analyze 106 flares of Geostationary Operational Environmental Satellite class ≥M1.0 during 2010-2019. We calculate mean characteristic twist parameters α FPIL within the "flari…
New Insights into the Structure of Open Clusters in the Gaia Era
Chen, Li; Zhong, Jing; Hou, Jinliang +2 more
With the help of Gaia data, it is noted that in addition to the core components, there are low-density outer halo components in the extended region of open clusters. In order to study the extended structure beyond the core radius of the cluster (~10 pc), based on Gaia Early Data Release 3, taking up to 50 pc as the searching radius, we use the pyU…
Galaxy cluster strong lensing cosmography. Cosmological constraints from a sample of regular galaxy clusters
Grillo, C.; Rosati, P.; Caminha, G. B. +1 more
Cluster strong lensing cosmography is a promising probe of the background geometry of the Universe and several studies have emerged thanks to the increased quality of observations using space- and ground-based telescopes. For the first time, we used a sample of five cluster strong lenses to measure the values of cosmological parameters and combine…
Asteroseismology of the multiple stellar populations in the globular cluster M4
Milone, A. P.; Tailo, M.; Bragaglia, A. +6 more
We present a new asteroseismic analysis of the stars in the globular cluster (GC) M4 based on the data collected by the K2 mission. We report the detection of solar-like oscillation in 37 stars, 32 red giant branch (RGB) and six red horizontal branch (rHB) stars, which is the largest sample for this kind of study in GCs up to date. Combining infor…
The Sun and Space Weather
Gopalswamy, Nat
The explosion of space weather research since the early 1990s has been partly fueled by the unprecedented, uniform, and extended observations of solar disturbances from space- and ground-based instruments. Coronal mass ejections (CMEs) from closed magnetic field regions and high-speed streams (HSS) from open-field regions on the Sun account for mo…
Integrated mass-loss of evolved stars in M4 using asteroseismology
Stello, Dennis; De Silva, Gayandhi M.; Howell, Madeline +1 more
Mass-loss remains a major uncertainty in stellar modelling. In low-mass stars, mass-loss is most significant on the red giant branch (RGB), and will impact the star's evolutionary path and final stellar remnant. Directly measuring the mass difference of stars in various phases of evolution represents one of the best ways to quantify integrated mas…
Improved strong lensing modelling of galaxy clusters using the Fundamental Plane: Detailed mapping of the baryonic and dark matter mass distribution of Abell S1063
Grillo, C.; Rosati, P.; Meneghetti, M. +6 more
Aims: From accurate photometric and spectroscopic information, we build the Fundamental Plane (FP) relation for the early-type galaxies of the cluster Abell S1063. We use this relation to develop an improved strong lensing model of the cluster, and we decompose the cluster's cumulative projected total mass profile into its stellar, hot gas, a…
The Mars system revealed by the Martian Moons eXploration mission
Montmessin, Franck; Leblanc, François; Vandaele, Ann Carine +21 more
Japan Aerospace Exploration Agency (JAXA) plans a Phobos sample return mission (MMX: Martian Moons eXploration). In this study, we review the related works on the past climate of Mars, its evolution, and the present climate and weather to describe the scientific goals and strategies of the MMX mission regarding the evolution of the Martian surface…
Pseudoscalar sterile neutrino self-interactions in light of Planck, SPT and ACT data
Gariazzo, Stefano; Archidiacono, Maria; Hannestad, Steen +4 more
We reassess the viability of a cosmological model including a fourth additional sterile neutrino species that self-interacts through a new pseudoscalar degree of freedom. We perform a series of extensive analyses fitting various combinations of cosmic microwave background (CMB) data from Planck, the Atacama Cosmology Telescope (ACT) and the South …