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An Investigation of the Pleiades Cluster Using Machine Learning
Gao, Xin-hua
This paper presents an investigation on fundamental astrophysical properties of the Pleiades cluster (M 45) using high-precision astrometric and photometric data from the Gaia Data Release 2 (Gaia-DR2). To obtain reliable cluster members, a machine-learning (ML) method is used to compute membership probabilities for 31462 sample stars within a rad…
The tale of the Milky Way globular cluster NGC 6362 - I. The orbit and its possible extended star debris features as revealed by Gaia DR2
Robin, Annie C.; Minniti, Dante; Fernández-Trincado, José G. +5 more
We report the identification of possible extended star debris candidates beyond the cluster tidal radius of NGC 6362 based on the second Gaia data release (Gaia DR2). We found 259 objects possibly associated with the cluster lying in the vicinity of the giant branch and 1-2 magnitudes fainter/brighter than the main-sequence turn-off in the cluster…
Global mapping of lunar refractory elements: multivariate regression vs. machine learning
Wöhler, C.; Grumpe, A.; Bhatt, M. +2 more
Context. The quantitative estimation of elemental concentrations at the spatial resolution of hyperspectral near-infrared (NIR) images of the lunar surface is an important tool for understanding the processes relevant for the origin and evolution of the Moon.
Aims: We aim to map the abundances of the elements Fe, Ca, and Mg at a typical accur…
Close-range remote sensing of Saturn's rings during Cassini's ring-grazing orbits and Grand Finale
Nicholson, Philip D.; Hedman, Matthew M.; Sotin, Christophe +22 more
Saturn's rings are an accessible exemplar of an astrophysical disk, tracing the Saturn system's dynamical processes and history. We present close-range remote-sensing observations of the main rings from the Cassini spacecraft. We find detailed sculpting of the rings by embedded masses, and banded texture belts throughout the rings. Saturn-orbiting…
Exoplanets in the Antarctic Sky. II. 116 Transiting Exoplanet Candidates Found by AST3-II (CHESPA) within the Southern CVZ of TESS
Wittenmyer, Robert A.; Wang, Lifan; Yang, Ming +37 more
We report first results from the CHinese Exoplanet Searching Program from Antarctica (CHESPA)—a wide-field high-resolution photometric survey for transiting exoplanets carried out using telescopes of the AST3 (Antarctic Survey Telescopes times 3) project. There are now three telescopes (AST3-I, AST3-II, and CSTAR-II) operating at Dome A—the highes…
ALMA CO Observations of Supernova Remnant N63A in the Large Magellanic Cloud: Discovery of Dense Molecular Clouds Embedded within Shock-ionized and Photoionized Nebulae
Filipović, M. D.; Rowell, G.; Sasaki, M. +19 more
We carried out new 12CO(J = 1-0, 3-2) observations of a N63A supernova remnant (SNR) from the LMC using the Atacama Large Millimeter/submillimeter Array (ALMA) and Atacama Submillimeter Telescope Experiment. We find three giant molecular clouds toward the northeast, east, and near the center of the SNR. Using the ALMA data, we spatially…
Spectroscopic and astrometric radial velocities: Hyades as a benchmark
Pasquini, L.; Ludwig, H. -G.; de Medeiros, J. R. +1 more
We study the accuracy of spectroscopic radial velocities (RVs) by comparing spectroscopic and astrometric RVs for stars of the Hyades open cluster. We obtained High-Accuracy Radial velocity Planet Searcher (HARPS) spectra for a large sample of Hyades stars and combined them with accurate astrometric RVs based on Hipparcos and Gaia data. After clea…
Hinode EIS line widths in the quiet corona up to 1.5 R⊙
Mason, H. E.; Del Zanna, G.; Gupta, G. R.
We present an analysis of several Hinode Extreme-ultraviolet Imaging Spectrometer (EIS) observations of coronal line widths in the quiet Sun, up to 1.5 R⊙ radial distances. Significant variations are found, which indicates no damping of Alfvén waves in the quiescent corona. However, the uncertainties in estimating the instrumental width…
Seasonal formation rates of martian slope streaks
Jaumann, R.; Hiesinger, H.; Kreslavsky, M. +3 more
Slope streaks are gravity-driven dark or light-toned features that form throughout the martian year in high-albedo and low-thermal inertia equatorial regions on Mars. These distinctive features have never been observed in a terrestrial environment although some analogs have been proposed. Based on diverse orbital observations, a number of mechanis…
General study of chameleon fifth force in gravity space experiments
Bergé, Joel; Pernot-Borràs, Martin; Uzan, Jean-Philippe +1 more
In this article we investigate the profile of the scalar field of a scalar-tensor theory subject to the chameleon mechanism in the context of gravity space missions like the MICROSCOPE experiment. We analyze the experimental situations for models with an inverse power-law potential that can in principle induce a fifth force inside the satellite, a…