Search Publications
New view of the Balmer-Kapteyn region: Cryptomare distribution and formation
Li, Fei; Yan, Jianguo; Gao, Wutong +4 more
Context. The cryptomare in the Balmer-Kapteyn region is the oldest one on the Moon. Determining the extent and formation of this feature can deepen our understanding of early mare volcanism and help establish temporal and spatial constraints on lunar thermal and volcanic history.
Aims: This paper focuses on the identification of lunar cryptom…
Asymmetric deformation of the Earth's magnetosphere under low Alfvén Mach number solar wind: Observations and MHD simulation
Kasahara, Satoshi; Lavraud, Benoit; Saito, Yoshifumi +5 more
The density of the solar wind plasma near the Earth's magnetosphere sometimes decreases to only several per cent of the usual value, and such density extrema result in a significant reduction of the dynamic pressure and Alfvén Mach number (
Identification of new hot subdwarf binary systems by means of Virtual Observatory tools
Álvarez, M. A.; Dafonte, C.; Manteiga, M. +7 more
The estimation of the binary fraction of hot subdwarfs is key to shed light on the different evolution scenarios proposed to explain the loss of the hydrogen envelope during the red giant branch phase. In this paper, we analyse the spectral energy distribution of the hot subdwarfs included in a recent and comprehensive catalogue with the aim of id…
Tomography of the Solar Corona with the Metis Coronagraph I: Predictive Simulations with Visible-Light Images
Romoli, Marco; Frassati, Federica; Bemporad, Alessandro +5 more
The Solar Orbiter/Metis coronagraph records full-Sun visible-light polarized brightness (p B -) images of the solar corona. This work investigates the utility of a synoptic observational program of Metis for tomographic reconstruction of the three-dimensional (3D) distribution of the electron density of the global solar corona. During its lifetime…
Machine learning for galactic archaeology: a chemistry-based neural network method for identification of accreted disc stars
Grand, Robert J. J.; Gómez, Facundo A.; Marinacci, Federico +4 more
We develop a method ('Galactic Archaeology Neural Network', GANN) based on neural network models (NNMs) to identify accreted stars in galactic discs by only their chemical fingerprint and age, using a suite of simulated galaxies from the Auriga Project. We train the network on the target galaxy's own local environment defined by the stellar halo a…
20 Orbits of binaries based on soar speckle observations
Docobo, José A.; Campo, Pedro P.; Mendez, Rene A. +3 more
New observational data obtained during the 2018, 2019, and 2020 speckle runs with the 4.1-m Southern Astrophysical Research (SOAR) telescope located at Cerro Pachón (Chile) allowed us to recalculate the orbits of the visual binaries: WDS 00277-1625 (YR 1 Aa,Ab), WDS 00462-2214 (RST4155), WDS 03124-4425 (JC 8), WDS 07427-3510 (HDS 1091), WDS 10093+…
Modelling the correlated keV/TeV light curves of Be/gamma-ray binaries
Takata, J.; Chen, A. M.
Be/γ-ray binaries comprise a confirmed or presumptive pulsar orbiting a Be star and emit luminous γ-rays. Non-thermal emissions are thought to arise from synchrotron radiation and inverse-Compton (IC) scattering in the shock where the pulsar wind is terminated by the stellar outflow. We study wind interactions and shock radiations from such system…
Polarization Observations of a Split-band Type II Radio Burst from the Solar Corona
Ramesh, R.; Kathiravan, C.
Using temporal observations of circular polarized harmonic plasma emission from a split-band type II solar radio burst at 80 MHz, we separately estimated the coronal magnetic field strengths (B) associated with the lower (L) and upper (U) frequency bands of the burst. The corresponding Stokes I and V data were obtained with the polarimeter operati…
Environmental Effects in Herschel Observations of the Ionized Carbon Content of Star-forming Dwarf Galaxies in the Virgo Cluster
Fadda, Dario; Davies, Jonathan; Minchin, Robert +2 more
We use archival Herschel data to examine the singly ionized carbon ([C II]) content of 14 star-forming dwarf galaxies in the Virgo cluster. We use spectral energy distribution fits to far-infrared, mid-infrared, near-infrared, optical, and ultraviolet data to derive the total infrared continuum (TIR) for these galaxies. We compare the [C II]/TIR r…
In Situ Observation of a Magnetopause Indentation that Is Correspondent to Throat Aurora and Is Caused by Magnetopause Reconnection
Shi, Run; Li, Bin; Zhou, Su +6 more
Throat auroras have been suggested to correspond to magnetopause indentations, but how such indentations can be generated is an open question. Using coordinated magnetopause in situ and two-dimensional auroral imaging observations, we showed that a transient magnetopause crossing observed by Time History of Events and Macroscale Interactions durin…