Search Publications
Are Milky-Way-like galaxies like the Milky Way? A view from SDSS-IV/MaNGA
Merrifield, Michael; Aragón-Salamanca, Alfonso; Drory, Niv +3 more
In this paper, we place the Milky Way (MW) in the context of similar-looking galaxies in terms of their star-formation and chemical evolution histories. We select a sample of 138 Milky Way analogues (MWAs) from the SDSS-IV/MaNGA survey based on their masses, Hubble types, and bulge-to-total ratios. To compare their chemical properties to the detai…
HUBPUG: proper motions for local group dwarfs observed with HST utilizing Gaia as a reference frame
Weisz, Daniel R.; Savino, Alessandro; Kallivayalil, Nitya +6 more
We present the method behind HUBPUG, a software tool built for recovering systemic proper motions (PMs) of targets (e.g. clusters or resolved galaxies) in Hubble Space Telescope (HST) fields with two epochs of observations by utilizing stars observed by Gaia as a foreground frame of reference.HST PM experiments have typically relied on the use of …
Detection and Characterization of a Coronal Mass Ejection Using Interplanetary Scintillation Measurements From the Murchison Widefield Array
Morgan, J.; Ekers, R.; McCauley, P. I. +2 more
We have shown previously that the Murchison Widefield Array (MWA), can detect 100s of Interplanetary Scintillation (IPS) sources simultaneously across a field of view (FoV) ∼30° in extent. To test if we can use this capability to track heliospheric structures, we undertook a search of 88 hr of MWA IPS data, and identified an observation likely to …
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…