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Modeling the Formation and Evolution of Solar Wind Microstreams: From Coronal Plumes to Propagating Alfvénic Velocity Spikes
Rouillard, Alexis P.; Réville, Victor; Gannouni, Bahaeddine
We investigate the origin of mesoscale structures in the solar wind called microstreams, defined as enhancements in the solar wind speed and temperature that last several hours. They were first clearly detected in Helios and Ulysses solar wind data and are now omnipresent in the "young" solar wind measured by the Parker Solar Probe and Solar Orbit…
Composite Bulges. III. A Study of Nuclear Star Clusters in Nearby Spiral Galaxies
Beckman, John E.; Bender, Ralf; Drory, Niv +17 more
We present photometric and morphological analyses of nuclear star clusters (NSCs)-very dense, massive star clusters present in the central regions of most galaxies-in a sample of 33 massive disk galaxies within 20 Mpc, part of the "Composite Bulges Survey." We use data from the Hubble Space Telescope including optical (F475W and F814W) and near-IR…
Cluster Observation on the Latitudinal Distribution of Magnetic Pc5 Pulsations in the Inner Magnetosphere
Cao, Jinbin; Li, Xinlin; Liu, Wenlong +4 more
Ultralow frequency (ULF) waves in the Pc5 band are ubiquitous in the inner magnetosphere and can impact radiation belt dynamics by interacting with electrons through drift or drift-bounce resonance. In this paper, based on ∼ 19 years of Cluster measurements, we perform a comprehensive study of the three-dimensional distribution of poloidal, toroid…
Searching for Gravitational-wave Counterparts Using the Transiting Exoplanet Survey Satellite
Jayaraman, Rahul; Ricker, George R.; Vanderspek, Roland +3 more
In 2017, the LIGO and Virgo gravitational-wave (GW) detectors, in conjunction with electromagnetic (EM) astronomers, observed the first GW multimessenger astrophysical event, the binary neutron star (BNS) merger GW170817. This marked the beginning of a new era in multimessenger astrophysics. To discover further GW multimessenger events, we explore…
Asteroids' reflectance from Gaia DR3: Artificial reddening at near-UV wavelengths
Tatsumi, E.; Tanga, P.; De Angeli, F. +6 more
Context. Observational and instrumental difficulties observing small bodies below 0.5 µm make this wavelength range poorly studied compared with the visible and near-infrared. Furthermore, the suitability of many commonly used solar analogues, essential in the computation of asteroid reflectances, is usually assessed only in visible waveleng…
Enhancing the alignment of the optically bright Gaia reference frame with respect to the International Celestial Reference System
Xu, Ming H.; Anderson, James M.; Lunz, Susanne +4 more
Context. The link of the Gaia frame in terms of non-rotation with respect to the International Celestial Reference System (ICRS), which is realized via very long baseline interferometry (VLBI) at radio wavelengths, has to be conducted for the wide range of optical magnitudes in which the spacecraft observes. There is a sufficient number of suitabl…
Identifying Symbiotic Stars with Machine Learning
Lü, Guoliang; Guo, Sufen; Jia, Yongle +3 more
Symbiotic stars are interacting binary systems, making them valuable for studying various astronomical phenomena, such as stellar evolution, mass transfer, and accretion processes. Despite recent progress in the discovery of symbiotic stars, a significant discrepancy between the observed population of symbiotic stars and the number predicted by th…
ALMA Reveals Hidden Morphologies in the Molecular Envelope of VY Canis Majoris
Humphreys, R. M.; Decin, L.; Richards, A. M. S. +2 more
The J = 2 → 1 transition of CO near 230 GHz and the J = 3 → 2 line of HCN at 265 GHz have been imaged in the envelope of the red hypergiant star, VY Canis Majoris (VY CMa), using the Atacama Large Millimeter Array (ALMA) with angular resolutions 0.″2-1.″5; single-dish data were added to provide sensitivity up to 30″. These images reveal a far more…
The Evryscope Fast Transient Engine: Real-time Detection for Rapidly Evolving Transients
Law, Nicholas M.; Corbett, Hank; Carney, Jonathan +8 more
Astrophysical transients with rapid developments on subhour timescales are intrinsically rare. Due to their short durations, events like stellar superflares, optical flashes from gamma-ray bursts, and shock breakouts from young supernovae are difficult to identify on timescales that enable spectroscopic follow-up. This paper presents the Evryscope…
The Hα Luminosity Function of Galaxies at z 4.5
Illingworth, Garth D.; Labbé, Ivo; Bouwens, Rychard J. +5 more
We present the Hα luminosity function (LF) derived from a large sample of Lyman break galaxies at z ~ 4.5 over the GOODS-South and North fields. This study makes use of the new, full-depth Spitzer/IRAC [3.6] and [4.5] imaging from the GOODS Re-ionization Era wide-Area Treasury from the Spitzer program. The Hα flux is derived from the offset betwee…