A5087363846- Planetary Science and Exploration
- Astro and Planetary Science
- Space Exploration and Technology
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Space exploration and regulation
- Spacecraft and Cryogenic Technologies
- Spaceflight effects on biology
- Atmospheric Ozone and Climate
- Scientific Research and Discoveries
Johns Hopkins University Applied Physics Laboratory
2020-2025
American Astronomical Society
2025
Purdue University West Lafayette
2021-2024
Planetary Science Institute
2024
Towson University
2021
Abstract Troilite is a common phase in iron meteorites, but there are limited data available for the partitioning behavior of elements between troilite and solid metal. In this study, we present results experiments with coexisting Fe‐Ni metal, an S‐rich metallic liquid, troilite, conducted at 800–925°C evacuated silica tubes 1 atm. We report metal–troilite partition coefficients 22 commonly studied meteorites. find that chalcophile have affinity majority siderophile incompatible troilite. A...
Abstract Mercury’s south polar region is of particular interest since Arecibo radar measurements show many high-reflectance regions consistent with ice deposits. However, current elevation information in southern hemisphere not sufficient to perform detailed modeling the illumination and thermal conditions at these radar-bright locations constrain properties volatiles potentially residing there. In this work, we leverage previously existing maps surface from stereo-photogrammetry 665 m pix...
Abstract Images from the Mercury Dual Imaging System (MDIS) aboard MErcury Surface, Space ENvironment, GEochemistry, and Ranging mission reveal low-reflectance polar deposits that are interpreted to be lag of organic-rich, volatile material. Interpretation these highest-resolution images Mercury’s has been limited by available topography models, so local high-resolution (125 m pixel −1 ) digital elevation models (DEMs) were made using a combination data Laser Altimeter (MLA)...
Salt clouds are predicted to be common on warm exoplanets, but their optical properties uncertain. The Exoplanet Cloud Ensemble Scattering System (ExCESS), a new apparatus measure the scattering intensity and degree of linear polarization (DOLP) for an ensemble particles, is introduced here used study light KCl cloud analogs. ExCESS illuminates particles with polarized laser beam (532 nm) uses photomultiplier tube detector sweep plane illumination. measurements were collected three size...
Abstract We present new high-resolution topographic, illumination, and thermal models of Mercury’s 112 km diameter north polar crater, Prokofiev. The confirm previous results that water ice is stable at the surface within permanently shadowed regions (PSRs) Prokofiev for geologic timescales. largest radar-bright region in confirmed to extend up several kilometers past boundary its PSR, making it unique on Mercury hosting a significant area outside PSR. near-infrared normal albedo...
Abstract Observations made by Earth-based radar telescopes and the MErcury Surface, Space ENvironment, GEochemistry, Ranging (MESSENGER) spacecraft provided compelling evidence for water ice in Mercury's polar craters. In our investigation, we constructed higher-resolution (125 m pixel −1 ) digital elevation models (DEMs) four of largest northernmost craters, Kandinsky, Tolkien, Chesterton, Tryggvadóttir. The DEMs were leveraged to model solar illumination thermal environment, products that...
Abstract Examining reflected light from exoplanets aids in our understanding of the scattering properties their atmospheres and will be a primary task future flagship space- ground-based telescopes. We introduce an enhanced capability Planetary Intensity Code for Atmospheric Scattering Observations ( PICASO ), open-source radiative transfer model used exoplanet brown dwarf atmospheres, to produce phase curves three-dimensional atmospheric models. Since is coupled cloud code Virga , we...
The presence of meters-thick polar deposits exposed directly on the surface Mercury provides unique science opportunities that should be prioritized in next decade planetary exploration.The poles provide a natural laboratory for understanding chemical, physical, and thermal processes have governed supply, retention, modification, loss water other volatiles delivered to inner solar system through time.Polar are composed primarily ice, additional coincident organic-rich frozen offers nearby...
Abstract We present a study of candidate galaxy–absorber pairs for 43 low-redshift QSO sightlines (0.06 < z 0.85) observed with the Hubble Space Telescope/Cosmic Origins Spectrograph that lie within footprint Sloan Digital Sky Survey statistical approach to match absorbers galaxies near lines sight using only SDSS Data Release 12 photometric data galaxies, including estimates their redshifts. Our Bayesian methods combine information measured properties circumgalactic medium find most...