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Clay minerals on Mars: An up-to-date review with future perspectives
Ye, Binlong; Du, Peixin; Yuan, Peng +1 more
Clay minerals, or analogously phyllosilicates, are some of the most astonishing minerals ever discovered on Mars due to their roles as indicators of water-rock interaction. Their types, abundances, and locations provide hints to ancient environmental conditions of Mars and to the possible places where present-day mineral-bound water and/or biosign…
Analysis of NASA's DSN Venus Express radio occultation data for year 2014
Gramigna, Edoardo; Tortora, Paolo; Zannoni, Marco +5 more
The Venus Express Radio Science Experiment (VeRa) was part of the scientific payload of the Venus Express (VEX) spacecraft and was targeted at the investigation of Venus' atmosphere, surface, and gravity field as well as the interplanetary medium. This paper describes the methods and the required calibrations applied to VEX-VeRa raw radio occultat…
Search for LBVs in the Local Volume galaxies: study of two stars in NGC 1156
Vinokurov, A.; Solovyeva, Y.; Atapin, K. +7 more
We continue the search for luminous blue variables (LBVs) in Local Volume galaxies in order to study their fundamental parameters. In this paper, we report the discovery of two new LBVs in the dwarf irregular galaxy NGC 1156. Both stars exhibit spectral variability simultaneously with strong brightness variations: ΔRc = 0.84 ± 0.23…
First Metis Detection of the Helium D3 Line Polarization in a Large Eruptive Prominence
Telloni, Daniele; Susino, Roberto; Fineschi, Silvano +24 more
Metis on board Solar Orbiter is the space coronagraph developed by an Italian-German-Czech consortium. It is capable of observing solar corona and various coronal structures in the visible-light (VL) and UV (hydrogen Lyα) channels simultaneously for the first time. Here we present observations of a large eruptive prominence on 2021 April 25-26, in…
All-sky Faint DA White Dwarf Spectrophotometric Standards for Astrophysical Observatories: The Complete Sample
Rest, Armin; Matheson, Thomas; Points, Sean +14 more
Hot DA white dwarfs (DAWDs) have fully radiative pure hydrogen atmospheres that are the least complicated to model. Pulsationally stable, they are fully characterized by their effective temperature T eff and surface gravity , which can be deduced from their optical spectra and used in model atmospheres to predict their spectral energy d…
Morphology and paleohydrology of intracrater alluvial fans north of Hellas Basin, Mars
Williams, Rebecca M. E.; Anderson, Ryan B.; Gullikson, Amber L. +1 more
Alluvial fans and sinuous ridges are both important records of the history of fluvial activity on Mars, and they often occur together. We present observations of alluvial fans, many of which exhibit inverted relief, in five craters in the region north of Hellas basin. The observed fans ranged in size from ~10 to 820 km2. We identified t…
The cosmic waltz of Coma Berenices and Latyshev 2 (Group X). Membership, phase-space structure, mass, and energy distributions
Béjar, V. J. S.; Martín, E. L.; Lodieu, N. +3 more
Context. Open clusters (OCs) are fundamental benchmarks where theories of star formation and stellar evolution can be tested and validated. Coma Berenices (Coma Ber) and Latyshev 2 (Group X) are the second and third OCs closest to the Sun, making them excellent targets to search for low-mass stars and ultra-cool dwarfs. In addition, this pair will…
NEOWISE Variability of the New Gaia Herbig Ae/Be and Classical Be Stars-Variability Sample and Statistical Analysis
Mei, Ying; Song, Shi-Ming; Liu, Jun-Ting +2 more
Light variability is an essential attribute of young stellar objects (YSOs) at the pre-main-sequence (PMS) stage, which can be treated as an indicator to trace star formation. We present a statistical study on the infrared NEOWISE variability of new and large-sized PMS stars as well as Herbig Ae/Be (HAeBe) and classical Be (CBe) stars identified f…
Stereoscopic disambiguation of vector magnetograms: First applications to SO/PHI-HRT data
Woch, J.; Solanki, S. K.; Parenti, S. +34 more
Contact. Spectropolarimetric reconstructions of the photospheric vector magnetic field are intrinsically limited by the 180° ambiguity in the orientation of the transverse component. So far, the removal of such an ambiguity has required assumptions about the properties of the photospheric field, which makes disambiguation methods model-dependent. …
Updated Reference Wavelengths for Si VII and Mg VII Lines in the 272-281 Å Range
Young, Peter R.
New reference wavelengths for atomic transitions of Mg VII and Si VII in the 272-281 Å wavelength range are derived using measurements from the Extreme-ultraviolet Imaging Spectrometer (EIS) on board the Hinode spacecraft. Mg VII and Si VII are important ions for measuring plasma properties in the solar transition region at around 0.6 MK. The six …