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On the Collisional Disalignment of Dust Grains in Illuminated and Shaded Regions of IC 63
Soam, Archana; Andersson, B. -G.; Acosta-Pulido, Jose +5 more
Interstellar dust grain alignment causes polarization from UV to mm wavelengths, allowing the study of the geometry and strength of the magnetic field. Over the last couple of decades, observations and theory have led to the establishment of the radiative alignment torque mechanism as a leading candidate to explain the effect. With a quantitativel…
Orbital parameters of the hierarchical triplet system CN Lyn
Liao, WenPing; Qian, ShengBang; Li, LinJia
CN Lyn is an intriguing triplet system that contains three equal-mass components. However, the orbital parameters of this rare triple system are still unknown. By monitoring the system since 2016 October 19, 13 eclipse times have been obtained. We discover that the observed minus calculated (O - C) diagram of CN Lyn shows a cyclical variation with…
Geology and history of the Malea Planum region: A new view of Mars' oldest large volcanic province
Williams, David A.; Bernhardt, Hannes
Characterized by large paterae and late Noachian wrinkle-ridged plains, the ~1.2 million km2 Malea Planum region (MPR) has been grouped into a circum-Hellas volcanic province and likely represents the oldest of the large volcanic areas on Mars. Being key to Mars' early volcanic, tectonic, and climate evolution, we conducted a comprehens…
Titan in Transit: Ultraviolet Stellar Occultation Observations Reveal a Complex Atmospheric Structure
Tribbett, Patrick D.; Robinson, Tyler D.; Koskinen, Tommi T.
Transit spectroscopy is a key tool for exoplanet atmospheric characterization. However, transit spectrum observations can be limited by aerosol extinction when gas opacities are weak. The ultraviolet wavelength range contains a variety of strong molecular and atomic features, potentially enabling gas species detection even when atmospheric hazes a…
The relative supernovae contribution to the chemical enrichment history of Abell 1837
Hudaverdi, M.; Erdim, M. K.; Ezer, C. +2 more
In this paper, we report the relative supernovae (SNe) contribution to the metal budget of the intracluster medium (ICM) of the Abell 1837 galaxy cluster at redshift z = 0.069. For this purpose, we analysed the hot ICM of the cluster and obtained radial metal distributions using XMM-Newton archival data with a total exposure of ~100 ks. These meta…
Chemical Compositions of Red Giant Stars from Habitable Zone Planet Finder Spectroscopy
Mahadevan, Suvrath; Terrien, Ryan; Lind, Karin +15 more
We have used the Habitable Zone Planet Finder (HPF) to gather high-resolution, high signal-to-noise near-infrared spectra of 13 field red horizontal branch (RHB) stars, one open cluster giant, and one very metal-poor halo red giant. The HPF spectra cover the 0.81-1.28 µm wavelength range of the zyJ bands, partially filling the gap between th…
Quiet-time low energy ion spectra observed on Solar Orbiter during solar minimum
Kulkarni, S. R.; Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F. +32 more
Context. The Solar Orbiter spacecraft cruised in the inner heliosphere during Feb. 2020 - Jan. 2021, moving between ∼0.5-1.0 au radial distance. The Energetic Particle Detector suite operated continuously during this period.
Aims: The Suprathermal Ion Spectrograph and High Energy Telescope observations made during intervals in between transie…
A discontinuity in the luminosity-mass relation and fluctuations in the evolutionary tracks of low-mass and low-metallicity stars at the Gaia M-dwarf gap
Kroupa, Pavel; Mansfield, Santana
Context. The Gaia M-dwarf gap is a recently discovered feature in the colour-magnitude diagram that shows a deficiency of low-mass and low-metallicity stars at the lower end of the main sequence.
Aims: We aim at performing theoretical stellar modelling at low metallicities using a fine mass step and a fine time step, looking specifically for …
Registration and imaging polarimetry of the Fe 6374 Å red coronal line during the 2017 total solar eclipse
Li, S. Y.; Qu, Z. Q.; Liang, Y. +3 more
Strict registration is critical for imaging polarimetry; a highly accurate registration approach to the coronal image and imaging polarimetry of the Fe 6374 Å red coronal line have been researched in this paper. In order to improve the registration accuracy, this paper proposes the idea of image enhancement based on blind deconvolution combined wi…
Searching for Fermi GRB optical counterparts with the prototype Gravitational-wave Optical Transient Observer (GOTO)
Mullaney, J.; Ulaczyk, K.; Pallé, E. +45 more
The typical detection rate of ~1 gamma-ray burst (GRB) per day by the Fermi Gamma-ray Burst Monitor (GBM) provides a valuable opportunity to further our understanding of GRB physics. However, the large uncertainty of the Fermi localization typically prevents rapid identification of multiwavelength counterparts. We report the follow-up of 93 Fermi …