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Spectral Properties and the Influence of Coronal Mass Ejections in 3He-rich Solar Energetic Particle Events
Ho, G. C.; Mason, G. M.; Desai, M. I. +5 more
We analyze the spectral properties of 3He and 4He as well as the heavy ions (oxygen, neon, magnesium, silicon, and iron) in 80 3He-rich solar energetic particle (SEP) events observed by the Ultra-Low-Energy Ion Spectrometer on board the Advanced Composition Explorer spacecraft since its launch in 1997 until 2024. W…
Doppler signature of a possible termination shock in an off-limb solar flare
Chen, Bin; Yu, Sijie; Matthews, Sarah A. +2 more
We report striking Doppler velocity gradients observed during the well-observed 2017 September 10 solar flare, and argue that they are consistent with the presence of an above-the-looptop termination shock beneath the flare current sheet. Observations from the Hinode Extreme-ultraviolet Imaging Spectrometer measure plasma sheet Doppler shifts up t…
Probing the Dust Grain Alignment Mechanisms in Spiral Galaxies with M51 as the Case Study
Tram, Le Ngoc; Lopez-Rodriguez, Enrique
Magnetic fields (B fields) in galaxies have recently been traced using far-infrared and submillimeter polarimetric observations with the Stratospheric Observatory for Infrared Astronomy, James Clerk Maxwell Telescope, and Atacama Large Millimeter/submillimeter Array. The main assumption is that dust grains are magnetically aligned with the local B…
A search for intermediate-mass black holes in compact stellar systems through optical emissions from tidal disruption events
Norris, Mark A.; Pomeroy, Richard T.
Intermediate-mass black holes (IMBHs) are expected to exist in globular clusters (GCs) and compact stellar systems (CSSs) in general, but none have been conclusively detected. Tidal disruption events (TDEs), where a star is tidally disrupted by the gravitational field of a black hole, have been observed to occur around the supermassive black holes…
BepiColombo observations of cold oxygen and carbon ions in the flank of the induced magnetosphere of Venus
André, N.; Fedorov, A.; Krupp, N. +25 more
On 10 August 2021, the Mercury-bound BepiColombo spacecraft performed its second fly-by of Venus and provided a short-lived observation of its induced magnetosphere. Here we report results recorded by the Mass Spectrum Analyzer on board Mio, which reveal the presence of cold O+ and C+ with an average total flux of ~4 ± 1 × 10…
Properties of sunspot light bridges on a geometric height scale
Ruiz Cobo, B.; Asensio Ramos, A.; Esteban Pozuelo, S. +1 more
Context. Investigating light bridges (LBs) helps us comprehend key aspects of sunspots. However, few studies have analyzed the properties of LBs in terms of the geometric height, which is a more realistic perspective given the corrugation of the solar atmosphere. Aims. We aim to shed light on LBs by studying the variation in their physical propert…
Three young planets around the K-dwarf K2-198: high-energy environment, evaporation history, and expected future
Baratella, M.; Poppenhaeger, K.; Ilin, E. +1 more
Planets orbiting young stars are thought to experience atmospheric evaporation as a result of the host stars' high-magnetic activity. We study the evaporation history and expected future of the three known transiting exoplanets in the young multiplanet system K2-198. Based on spectroscopic and photometric measurements, we estimate an age of the K-…
Maser Investigation toward Off-Plane Stars (MIOPS): Detection of SiO Masers in the Galactic Thick Disk and Halo
Li, Juan; Gong, Yan; Menten, Karl M. +7 more
Studying stars that are located off the Galactic plane is important for understanding the formation history of the Milky Way. We searched for SiO masers toward off-plane O-rich asymptotic giant branch (AGB) stars from the catalog presented by Mauron et al. in order to shed light on the origins of these objects. A total of 102 stars were observed i…
Neglected Silicon Dioxide Polymorphs as Clouds in Substellar Atmospheres
Moran, Sarah E.; Marley, Mark S.; Crossley, Samuel D.
Direct mid-infrared signatures of silicate clouds in substellar atmospheres were first detected in Spitzer observations of brown dwarfs, although their existence was previously inferred from near-infrared spectra. With JWST's Mid-Infrared Instrument, we can now more deeply probe silicate features from 8 to 10 µm, exploring specific particle …
Studying the variability of fluorescence emission and the presence of clumpy wind in HMXB GX 301-2 using XMM-Newton
Paul, Biswajit; Roy, Kinjal; Manikantan, Hemanth
We present the results from an analysis of data from an XMM-Newton observation of the accreting high-mass X-ray binary pulsar GX 301-2. Spectral analysis in the non-flaring segment of the observation revealed that the equivalent width of the iron fluorescence emission is correlated with the observed absorption column density and the ratio of the i…