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Improving the Spectral Resolution and Wavelength Scale of SDO/EVE MEGS-A Flare Observations
Chamberlin, Phillip; Gonzalez, Gabriela; Herde, Vicki
The Extreme ultraviolet Variability Experiment (EVE) is one of three instruments onboard the Solar Dynamics Observatory (SDO). This paper focuses on using the "A" channel on the Multiple EUV Grating Spectrographs (MEGS-A) on EVE, which measures wavelengths of 5 – 37 nm, to improve the wavelength scale accuracy and spectral resolution during solar …
Modifications of astrophysical ices induced by cosmic rays. I. Water, carbon monoxide, and methanol mixtures
da Silveira, E. F.; Rothard, H.; Domaracka, A. +3 more
Aims: Astrophysical ices on dust grain mantles in the interstellar medium (ISM) and dense circumstellar envelopes (CSEs) are continuously exposed to galactic cosmic rays (GCRs). In a laboratory setting, we studied the physical and chemical modifications of ice layers induced by energetic heavy ions as GCR analogues. The ice layers used have a…
The TESS-Keck Survey. XXII. A Sub-Neptune Orbiting TOI-1437
Barclay, Thomas; Batalha, Natalie M.; Mayo, Andrew W. +40 more
Exoplanet discoveries have revealed a dramatic diversity of planet sizes across a vast array of orbital architectures. Sub-Neptunes are of particular interest; due to their absence in our own solar system, we rely on demographics of exoplanets to better understand their bulk composition and formation scenarios. Here, we present the discovery and c…
Photometric properties of classical bulge and pseudo-bulge galaxies at 0.5 ≤ z < 1.0
Hu, Jia; Cui, Qifan; Wang, Lan +2 more
Context. We compare the photometric properties and specific star formation rate (sSFR) of classical- and pseudo-bulge galaxies with M∗ ≥ 109.5 M⊙ at 0.5 ≤ z < 1.0, selected from all five CANDELS fields. We also compare these properties of bulge galaxies at lower redshift selected from MaNGA survey in previous wo…
Ultraviolet extinction correlation with 3D dust maps using white dwarfs
Redfield, Seth; Sahu, Snehalata; Gänsicke, Boris T. +2 more
Accurate astrometric and photometric measurements from Gaia have led to the construction of 3D dust extinction maps which can now be used for estimating the integrated extinctions of Galactic sources located within 5 kpc. These maps based on optical observations may not be reliable for use in the ultraviolet (UV) which is more sensitive to reddeni…
Radar Observations of Liquid Water in the South Polar Region of Mars: Indications from Astrobiology Perspectives
Xiong, Siting; Ding, Chunyu; Su, Yan +4 more
In recent decades, extensive research has led to the understanding that Mars once hosted substantial liquid-water reserves. While the current Martian landscape boasts significant water-ice deposits at its North and South poles, the elusive presence of liquid-water bodies has remained undetected. A breakthrough occurred with the identification of r…
The Formation of Filaments and Dense Cores in the Cocoon Nebula (IC 5146)
Kwon, Woojin; Cho, Jungyeon; Chung, Eun Jung +4 more
We present 850 µm linear polarization and C18O (3 ‑ 2) and 13CO (3 ‑ 2) molecular line observations toward the filaments (F13 and F13S) in the Cocoon Nebula (IC 5146) using the JCMT POL-2 and Heterodyne Array Receiver Program instruments. F13 and F13S are found to be thermally supercritical with identified dense cores a…
A morphological analysis of the galaxy cluster XLSSC 122 at z = 1.98
Canning, R. E. A.; Willis, J. P.; Rennehan, D. +1 more
We present a morphological analysis of 29 spectroscopically confirmed members of XLSSC 122, a massive galaxy cluster at
Theia 456: Tidally Shredding an Open Cluster
Cargile, Phillip A.; Agüeros, Marcel A.; Curtis, Jason L. +4 more
The application of clustering algorithms to the Gaia astrometric catalog has revolutionized our census of stellar populations in the milky Way, including the discovery of many new dispersed structures. We focus on one such structure, Theia 456 (COIN-Gaia-13), a loosely bound collection of ∼320 stars spanning ∼120 pc that has previously been shown …
Deep learning-based prediction of CME-driven shock standoff distances in metric type II radio emissions
Elsaid, Ahmed; Mahrous, Ayman; Hamada, Amr +1 more
Type II radio emissions are events mostly found to be associated with coronal mass ejections (CMEs) and accelerated by the CME-driven shock in the heliosphere. This study reports on the estimation of the CME-shock standoff distance at the commencement of metric type II radio emissions by combining the CME-deprojected speed and spectral features of…