245 citations · 1.6k across the 44 of their papers we have counts for
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Late Accretion of Ceres-like Asteroids and Their Implantation into the Outer Main Belt
Driss Takir, Wladimir Neumann, Sean N. Raymond +2
Low-albedo asteroids preserve a record of the primordial solar system planetesimals and the conditions in which the solar nebula was active. However, the origin and evolution of th…
Ultraviolet Spectroscopy of Lucy Mission Targets with the Hubble Space Telescope
Oriel A. Humes, Cristina A. Thomas, Joshua P. Emery +1
The recently launched Lucy mission aims to understand the dynamical history of the Solar System by examining the Jupiter Trojans, a population of primitive asteroids co-orbital wit…
The Nature of Low-Albedo Small Bodies from 3-m Spectroscopy: One Group that Formed Within the Ammonia Snow Line and One that Formed Beyond It
Andrew S. Rivkin, Joshua P. Emery, Ellen S. Howell +9
We present evidence, via a large survey of 191 new spectra along with previously-published spectra, of a divide in the 3-m spectral properties of the low-albedo asteroid populat…
A CO2 cycle on Ariel? Radiolytic production and migration to low latitude cold traps
Richard J. Cartwright, Tom A. Nordheim, David DeColibus +11
CO2 ice is present on the trailing hemisphere of Ariel but is mostly absent from its leading hemisphere. The leading/trailing hemispherical asymmetry in the distribution of CO2 ice…
Thermophysical Investigation of Asteroid Surfaces II: Factors Influencing Grain Size
Eric M. MacLennan, Joshua P. Emery
Asteroid surfaces are subjected to mechanical weathering processes that result in the development and evolution of regolith. Two proposed mechanisms--impact bombardment and thermal…
Thermophysical Investigation of Asteroid Surfaces I: Characterization of Thermal Inertia
Eric M. MacLennan, Joshua P. Emery
The thermal inertia of an asteroid is an indicator of the thermophysical properties of the regolith and is determined by the size of grains on the surface. Previous thermophysical…
The Lifecycle of Hollows on Mercury: An Evaluation of Candidate Volatile Phases and a Novel Model of Formation
Michael S. Phillips, Jeffrey E. Moersch, Christina E. Viviano +1
A thermophysical model was developed to test the viability of 57 candidate hollow-forming volatiles within the hollow-formation model framework of Blewett et al. (2013). We find th…
Compositional study of trans-Neptunian objects at λ > 2.2 μm
E. Fernández-Valenzuela, N. Pinilla-Alonso, J. Stansberry +12
Using data from the Infrared Array Camera on the Spitzer Space Telescope, we present photometric observations of a sample of 100 trans-Neptunian objects (TNOs) beyond 2.2 μm. These…
Spitzer's Solar System studies of asteroids, planets and the zodiacal cloud
David Trilling, Carey Lisse, Dale P. Cruikshank +13
In its 16 years of scientific measurements, the Spitzer Space Telescope performed a number of ground-breaking infrared measurements of Solar System objects. In this second of two p…
Spitzer's Solar System Science Legacy: Studies of the Relics of Solar System Formation & Evolution. Part 1 - Comets, Centaurs, & Kuiper Belt Objects
Carey Lisse, James Bauer, Dale Cruikshank +15
In its 16 years of scientific measurements, the Spitzer Space Telescope performed a number of ground breaking and key infrared measurements of Solar System objects near and far. Ta…
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…
Near-infrared observations of active asteroid (3200) Phaethon reveal no evidence for hydration
Driss Takir, Theodore Kareta, Joshua P. Emery +5
Asteroid (3200) Phaethon is an active near-Earth asteroid and the parent body of the Geminid Meteor Shower. Because of its small perihelion distance, Phaethon's surface reaches tem…
Characterization of material around the centaur (2060) Chiron from a visible and near-infrared stellar occultation in 2011
A. A. Sickafoose, A. S. Bosh, J. P. Emery +6
The centaur (2060) Chiron has exhibited outgassing behaviour and possibly hosts a ring system. On 2011 November 29, Chiron occulted a fairly bright star (R approximately 15 mag) as…
Probing the regoliths of the classical Uranian satellites: Are their surfaces mantled by a layer of tiny H2O ice grains?
Richard J. Cartwright, Joshua P. Emery, William M. Grundy +3
We investigate whether the surfaces of the classical moons of Uranus are compositionally stratified, with a thin veneer of mostly tiny H2O ice grains (<= 2 micron diameters) mantli…
Compositional Constraints for Lucy Mission Trojan Asteroids via Near-Infrared Spectroscopy
Benjamin N. L. Sharkey, Vishnu Reddy, Juan A. Sanchez +2
We report near-infrared (0.7-2.5 micron) reflectance spectra for each of the six target asteroids of the forthcoming NASA Discovery-class mission Lucy. Five Jupiter Trojans (the bi…
Infrared Spectroscopy of Large, Low-Albedo Asteroids: Are Ceres and Themis Archetypes or Outliers?
Andrew S. Rivkin, Ellen S. Howell, Joshua P. Emery
Low-albedo, hydrated objects dominate the list of the largest asteroids. These objects have varied spectral shapes in the 3-m region, where diagnostic absorptions due to volatil…
Thermophysical Modeling of Asteroid Surfaces using Ellipsoid Shape Models
Eric M. MacLennan, Joshua P. Emery
Thermophysical Models (TPMs), which have proven to be a powerful tool in the interpretation of the infrared emission of asteroid surfaces, typically make use of a priori obtained s…
Infrared Lightcurves of Near Earth Objects
Joseph L. Hora, Amir Siraj, Michael Mommert +9
We present lightcurves and derive periods and amplitudes for a subset of 38 near earth objects (NEOs) observed at 4.5 microns with the IRAC camera on the the Spitzer Space Telescop…
Red material on the large moons of Uranus: Dust from irregular satellites?
Richard J. Cartwright, Joshua P. Emery, Noemi Pinilla-Alonso +3
The large and tidally-locked classical moons of Uranus display longitudinal and planetocentric trends in their surface compositions. Spectrally red material has been detected prima…
The Science Case for an Extended Spitzer Mission
Jennifer C. Yee, Giovanni G. Fazio, Robert Benjamin +45
Although the final observations of the Spitzer Warm Mission are currently scheduled for March 2019, it can continue operations through the end of the decade with no loss of photome…
m spectra of Hilda asteroids
Ian Wong, Michael E. Brown, Joshua P. Emery
The Hilda asteroids are primitive bodies in resonance with Jupiter whose origin and physical properties are not well understood. Current models posit that these asteroids formed in…
Evidence for OH or H2O on the surface of 433 Eros and 1036 Ganymed
Andrew S. Rivkin, Ellen S. Howell, Joshua P. Emery +1
Water and hydroxyl, once thought to be found only in the primitive airless bodies that formed beyond roughly 2.5-3 AU, have recently been detected on the Moon and Vesta, which both…
Different origins or different evolutions? Decoding the spectral diversity among C-type asteroids
P. Vernazza, J. Castillo-Rogez, P. Beck +15
Anhydrous pyroxene-rich interplanetary dust particles (IDPs) have been proposed as surface analogs for about two-thirds of all C-complex asteroids. However, this suggestion appears…