B. Davidsson
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View article: The Caltech Mission to Apophis: Accelerating Planetary Science and Planetary Defense
The Caltech Mission to Apophis: Accelerating Planetary Science and Planetary Defense Open
The close approach of asteroid (99942) Apophis in 2029 offers a rare opportunity to observe the reaction of a small, suspected rubble-pile body to planetary tidal forces, providing insight into its surface and interior properties and contr…
View article: Kaboom: Surface Manifestations of Cometary Outbursts
Kaboom: Surface Manifestations of Cometary Outbursts Open
Comets are among the most primitive objects in the solar system, acting as time capsules that preserve clues about the solar system’s origins and early evolution. These icy bodies store volatile compounds that are sporadically released, of…
Determining the conditions for thermal stability of global near-surface water ice on the Moon Open
Observations by the Lunar Prospector and the Lunar Atmosphere and Dust Environment Explorer spacecraft suggest the existence of a near-global deposit of weakly bound water ice on the Moon, extending from a depth of a decimetre to at least …
Water vapor as a probe of the origin of gas in debris disks Open
Context . Debris disks contain the formation and evolution histories of planetary systems. Recent detections of gas in these disks have received considerable attention, as the origin of the gas sheds light on ongoing disk evolution and the…
Water vapor as a probe of the origin of gas in debris disks Open
Debris disks embrace the formation and evolution histories of planetary systems. Recent detections of gas in these disks have received considerable attention, as its origin ties up ongoing disk evolution and the present composition of plan…
Cliff collapse on Comet 67P/Churyumov–Gerasimenko – II. Imhotep and Hathor Open
Cliff collapses on Comet 67P/Churyumov–Gerasimenko expose relatively pristine nucleus matter and offer rare opportunities to characterize ice-rich comet material. Here, Microwave Instrument for Rosetta Orbiter (MIRO) observations of two co…
Cutting Edge Bionics in Highly Impaired Individuals: A Case of Challenges and Opportunities Open
Highly impaired individuals stand to benefit greatly from cutting-edge bionic technology, however concurrent functional deficits may complicate the adaptation of such technology. Here, we present a case in which a visually impaired individ…
Cliff collapse on Comet 67P/Churyumov–Gerasimenko – I. Aswan Open
The Aswan cliff on Comet 67P/Churyumov–Gerasimenko collapsed on 2015 July 10. Thereby, relatively pristine comet material from a depth of $\sim 12\, \mathrm{m}$ was exposed at the surface. Observations of the collapse site by the microwave…
Secondary gas in debris discs released following the decay of long-lived radioactive nuclides, catastrophic, or resurfacing collisions Open
Kuiper-like belts of planetesimals orbiting stars other than the Sun are most commonly detected from the thermal emission of small dust produced in collisions. Emission from gas, most notably CO, highlights the cometary nature of these pla…
Neutral gas coma dynamics: modeling of flows and attempts to link inner coma structures to properties of the nucleus Open
Deriving properties of cometary nuclei from coma data is of significant importance for our understanding of cometary activity and has implications beyond. Ground-based data represent the bulk of measurements available for comets. Yet, to d…
View article: Spatial Heterodyne Spectroscopy: A Powerful Technique for Remotely Measuring the State of Plasmas from the Solar Atmosphere to Geospace to Heliopause
Spatial Heterodyne Spectroscopy: A Powerful Technique for Remotely Measuring the State of Plasmas from the Solar Atmosphere to Geospace to Heliopause Open
Whitepaper #173 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research. Additional topics: solar physics; space-based missions/projects; system science.
Secondary gas in debris discs released following the decay of long-lived radioactive nuclides, catastrophic or resurfacing collisions Open
Kuiper-like belts of planetesimals orbiting stars other than the Sun are most commonly detected from the thermal emission of small dust produced in collisions. Emission from gas, most notably CO, highlights the cometary nature of these pla…
Collisional heating of icy planetesimals – I. Catastrophic collisions Open
Planetesimals in the primordial disc may have experienced a collisional cascade. If so, the comet nuclei later placed in the Kuiper belt, scattered disc, and Oort Cloud would primarily be fragments and collisional rubble piles from that ca…
View article: DROID: Bistatic low-frequency radar sounding of 99942 Apophis in 2029 
DROID: Bistatic low-frequency radar sounding of 99942 Apophis in 2029  Open
<p><strong>Science rationale:</strong> Our knowledge of the internal structure of asteroids entirely relies on inferences from remote sensing observations of the surface combined with theoretical modeling [1]. Is Apophis …
 DROID: A mission concept to accompany and characterize Apophis through its 2029 Earth closest approach Open
<p><strong>Introduction:</strong>&#160; The close approach of asteroid (99942) Apophis on April 13, 2029 presents a unique opportunity to achieve breakthrough science and strengthen planetary defense goals.&#160;&…
View article: CO2-driven surface changes in the Hapi region on Comet 67P/Churyumov–Gerasimenko
CO2-driven surface changes in the Hapi region on Comet 67P/Churyumov–Gerasimenko Open
Between 2014 December 31 and 2015 March 17, the OSIRIS cameras on Rosetta documented the growth of a $140\, \mathrm{\hbox{-}m}$ wide and $0.5\, \mathrm{\hbox{-}m}$ deep depression in the Hapi region on Comet 67P/Churyumov–Gerasimenko. This…
Albedo variegation on Comet 67P/Churyumov–Gerasimenko Open
We here study the level of albedo variegation on the nucleus of Comet 67P/Churyumov–Gerasimenko. This is done by fitting the parameters of a standard photometric phase function model to disc–average radiance factor data in images acquired …
Modelling the water and carbon dioxide production rates of Comet 67P/Churyumov–Gerasimenko Open
The European Space Agency Rosetta/Philae mission to Comet 67P/Churyumov–Gerasimenko in 2014–2016 is the most complete and diverse investigation of a comet carried out thus far. Yet, many physical and chemical properties of the comet remain…
Thermophysical evolution of planetesimals in the primordial disc Open
The primordial disc of small icy planetesimals, once located at 15–$30\, \mathrm{au}$ from the Sun, was disrupted by giant planet migration in the early Solar system. The primordial disc thereby became the source region of objects in the p…
Implications of surface roughness in models of water desorption on the Moon Open
The observed presence of water molecules in the dayside lunar regolith was an unexpected discovery and remains poorly understood. Standard thermophysical models predict temperatures that are too high for adsorbed water to be stable. We pro…
View article: What do small bodies tell us about the formation of the Solar System and the conditions in the early solar nebula?
What do small bodies tell us about the formation of the Solar System and the conditions in the early solar nebula? Open
We formulate major scientific questions about the properties of the solar nebula, and about the formation and early evolution of the first planetesimals, that should be addressed in the 2023-2032 decade. We provide recommendations on small…
Captured Small Solar System Bodies in the Ice Giant Region Open
This white paper advocates for the inclusion of small, captured Outer Solar system objects, found in the Ice Giant region in the next Decadal Survey. These objects include the Trojans and Irregular satellite populations of Uranus and Neptu…
View article: The Rocky‐Like Behavior of Cometary Landslides on 67P/Churyumov‐Gerasimenko
The Rocky‐Like Behavior of Cometary Landslides on 67P/Churyumov‐Gerasimenko Open
Landslides have been identified on several solar system bodies, and different mechanisms have been proposed to explain their runout length. We analyze images from the Rosetta mission and report the global characterization of such features …
Migrating Scarps as a Significant Driver for Cometary Surface Evolution Open
Rosetta observations of 67P/Churyumov‐Gerasimenko (67P) reveal that most changes occur in the fallback‐generated smooth terrains, vast deposits of granular material blanketing the comet's northern hemisphere. These changes express themselv…
Exposure Experiments of Amorphous Silicates and Organics to Cometary Ice and Vapor Analogs Open
Hydration is a major mineral alteration process in primitive asteroids and it might occur in comet nuclei; however, it is poorly understood at low temperatures, especially below the freezing point of water. Long-duration experiments were p…
AMBITION -- Comet Nucleus Cryogenic Sample Return (White paper for ESA's Voyage 2050 programme) Open
This white paper proposes that AMBITION, a Comet Nucleus Sample Return mission, be a cornerstone of ESA's Voyage 2050 programme. We summarise some of the most important questions still open in cometary science after the successes of the Ro…