230 citations · 834 across the 15 of their papers we have counts for
15 papers
Data-Driven Approaches to Searches for the Technosignatures of Advanced Civilizations
T. Joseph W. Lazio, S. G. Djorgovski, Andrew Howard +19
Humanity has wondered whether we are alone for millennia. The discovery of life elsewhere in the Universe, particularly intelligent life, would have profound effects, comparable to…
Detection of HCN and diverse redox chemistry in the plume of Enceladus
Jonah S. Peter, Tom A. Nordheim, Kevin P. Hand
The Cassini spacecraft observed that Saturn's moon Enceladus possesses a series of jets erupting from its South Polar Terrain. Previous studies of in situ data collected by Cassini…
Properties of the Nili Fossae Olivine-clay-carbonate lithology: orbital and in situ at Séítah
Adrian J. Brown, Linda Kah, Lucia Mandon +31
We examine the observed properties of the Nili Fossae olivine-clay-carbonate lithology from orbital data and in situ by the Mars 2020 rover at the Séítah unit in Jezero crater, inc…
Internal-Current Lorentz-Force Heating of Astrophysical Objects
Christopher F. Chyba, Kevin P. Hand
Two forms of ohmic heating of astrophysical secondaries have received particular attention: unipolar-generator heating with currents running between the primary and secondary; and…
A comprehensive revisit of select Galileo/NIMS observations of Europa
Ishan Mishra, Nikole Lewis, Jonathan Lunine +4
The Galileo Near Infrared Mapping Spectrometer (NIMS) collected spectra of Europa in the 0.7-5.2 m wavelength region, which have been critical to improving our understanding of…
Endogenic and Exogenic Contributions to Visible-wavelength Spectra of Europa's Trailing Hemisphere
Samantha K. Trumbo, Michael E. Brown, Kevin P. Hand
The composition of Europa's trailing hemisphere reflects the combined influences of endogenous geologic resurfacing and exogenous sulfur radiolysis. Using spatially resolved visibl…
Evidence for sulfur-bearing species on Callisto's leading hemisphere: Sourced from Jupiter's irregular satellites or Io?
Richard J. Cartwright, Tom A. Nordheim, Dale P. Cruikshank +5
We investigated whether sulfur-bearing species are present on the icy Galilean moon Callisto by analyzing eight near-infrared reflectance spectra collected over a wide range of sub…
Evidence for ammonia-bearing species on the Uranian satellite Ariel supports recent geologic activity
Richard J. Cartwright, Chloe B. Beddingfield, Tom A. Nordheim +6
We investigated whether ammonia-rich constituents are present on the surface of the Uranian moon Ariel by analyzing 32 near-infrared reflectance spectra collected over a wide range…
HO within chaos terrain on Europa's leading hemisphere
Samantha K. Trumbo, Michael E. Brown, Kevin P. Hand
Hydrogen peroxide is part of an important radiolytic cycle on Europa and may be a critical source of oxidants to the putative subsurface ocean. The surface geographic distribution…
A Search for Water Vapor Plumes on Europa using SOFIA
William Sparks, M. Richter, C. deWitt +8
We present mid-infrared SOFIA/EXES spectroscopy of Europa, seeking direct evidence of the presence of water vapor arising from plumes venting from the surface of Europa. We place q…
A New Spectral Feature on the Trailing Hemisphere of Europa at 3.78 microns
Samantha K. Trumbo, Michael E. Brown, Patrick D. Fischer +1
We present hemispherically resolved spectra of the surface of Europa from ~3.1--4.13 microns, which we obtained using the near infrared spectrometer NIRSPEC on the Keck II telescop…
Active Cryovolcanism on Europa?
William B. Sparks, Britney E. Schmidt, Melissa A. McGrath +4
Evidence for plumes of water on Europa has previously been found using the Hubble Space Telescope (HST) using two different observing techniques. Roth et al. (2014) found line emis…
Probing for Evidence of Plumes on Europa with HST/STIS
W. B. Sparks, K. P. Hand, M. A. McGrath +3
Roth et al (2014a) reported evidence for plumes of water venting from a southern high latitude region on Europa - spectroscopic detection of off-limb line emission from the dissoci…
Silicates on Iapetus from Cassini's Composite Infrared Spectrometer
Cindy L. Young, James J. Wray, Roger N. Clark +5
We present the first spectral features obtained from Cassini's Composite Infrared Spectrometer (CIRS) for any icy moon. The spectral region covered by CIRS focal planes (FP) 3 and…
Salts and radiation products on the surface of Europa
M. E. Brown, K. P. Hand
The surface of Europa could contain the compositional imprint of a underlying interior ocean, but competing hypotheses differ over whether spectral observations from the Galileo sp…