O. Aharonson
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View article: The History of Lunar Polar Ice Accumulation
The History of Lunar Polar Ice Accumulation Open
The lunar polar regions harbor water ice detected directly and indirectly by remotely sensed data. The deposits are concentrated within perennially shadowed regions where water molecules are thermally stable. Owing to the gradual decrease …
View article: The JANUS (Jovis Amorum ac Natorum Undique Scrutator) VIS-NIR Multi-Band Imager for the JUICE Mission
The JANUS (Jovis Amorum ac Natorum Undique Scrutator) VIS-NIR Multi-Band Imager for the JUICE Mission Open
The JANUS instrument (Jovis, Amorum ac Natorum Undique Scrutator) aboard the JUpiter ICy moons Explorer (JUICE) is a multispectral camera enabling imaging in the 380-1080 nm wavelength range. The performance and capability of JANUS fulfils…
View article: The Influence of Stellar Chromospheres and Coronae on Exoplanet Transmission Spectroscopy
The Influence of Stellar Chromospheres and Coronae on Exoplanet Transmission Spectroscopy Open
A main source of bias in transmission spectroscopy of exoplanet atmospheres is magnetic activity of the host star in the form of stellar spots, faculae, or flares. However, the fact that main-sequence stars have a chromosphere and a corona…
View article: Mars Without the Southern Perennial CO<sub>2</sub> Cover
Mars Without the Southern Perennial CO<sub>2</sub> Cover Open
The Martian South Polar Layered Deposits (SPLD) are composed mostly of ice and dust with a thin perennial cover and some internal ice layers. In the North, the seasonal cap is lost during summer, allowing O ice to sublimate into the atmosp…
View article: The Influence of Stellar Chromospheres and Coronae on Exoplanet Transmission Spectroscopy
The Influence of Stellar Chromospheres and Coronae on Exoplanet Transmission Spectroscopy Open
A main source of bias in transmission spectroscopy of exoplanet atmospheres is magnetic activity of the host star in the form of stellar spots, faculae or flares. However, the fact that main-sequence stars have a chromosphere and a corona,…
View article: Planetary Mass Determinations from a Simplified Photodynamical Model—Application to the Complete Kepler Dataset
Planetary Mass Determinations from a Simplified Photodynamical Model—Application to the Complete Kepler Dataset Open
We use PyDynamicaLC , a model using the least number of—and the least correlated—degrees of freedom needed to derive a photodynamical model, to describe some of the smallest—and lowest-transit-timing-variation-amplitude—of the Kepler plane…
View article: The Effect of Ground Ice Redistribution on the Martian Paleo‐CO2 ${\text{CO}}_{2}$ Cycle
The Effect of Ground Ice Redistribution on the Martian Paleo‐CO2 ${\text{CO}}_{2}$ Cycle Open
is the primary component of the martian atmosphere and its seasonal surface‐atmosphere exchange is responsible for many of the climate phenomena on the planet. Near‐surface ground water ice (’GI’) has been found to inhibit seasonal ice acc…
View article: Planetary Mass Determinations from a Simplified Photodynamical Model -- Application To The Complete Kepler Dataset
Planetary Mass Determinations from a Simplified Photodynamical Model -- Application To The Complete Kepler Dataset Open
We use PyDynamicaLC, a model using the least number of, and the least correlated, degrees of freedom needed to derive a photodynamical model, to describe some of the smallest -- and lowest TTV (transit timing variations) amplitude -- of th…
View article: ULTRASAT: A Wide-field Time-domain UV Space Telescope
ULTRASAT: A Wide-field Time-domain UV Space Telescope Open
The Ultraviolet Transient Astronomy Satellite (ULTRASAT) is scheduled to be launched to geostationary orbit in 2027. It will carry a telescope with an unprecedentedly large field of view (204 deg 2 ) and near-ultraviolet (NUV; 230–290 nm) …
View article: Kepler Multitransiting System Physical Properties and Impact Parameter Variations
Kepler Multitransiting System Physical Properties and Impact Parameter Variations Open
We fit a dynamical model to Kepler systems that contain four or more transiting planets using the analytic method AnalyticLC and obtain physical and orbital parameters for 101 planets in 23 systems, of which 95 are of mass significance bet…
View article: The Advantages of Global Photometric Models in Fitting Transit Variations
The Advantages of Global Photometric Models in Fitting Transit Variations Open
Estimation of planetary orbital and physical parameters from light-curve data relies heavily on the accurate interpretation of Transit Timing Variation (TTV) measurements. In this letter, we review the process of TTV measurement and compar…
View article: The Advantages of Global Photometric Models in Fitting Transit Variations
The Advantages of Global Photometric Models in Fitting Transit Variations Open
Estimation of planetary orbital and physical parameters from light-curve data relies heavily on the accurate interpretation of Transit Timing Variations (TTV) measurements. In this letter, we review the process of TTV measurement and compa…
View article: Kepler Multi-Transiting Systems Physical Properties and Impact Parameter Variations
Kepler Multi-Transiting Systems Physical Properties and Impact Parameter Variations Open
We fit a dynamical model to Kepler systems that contain four or more transiting planets using the analytic method AnalyticLC, and obtain physical and orbital parameters for 101 planets in 23 systems, of which 95 are of mass significance be…
View article: A Reappraisal of Subtropical Subsurface Water Ice Stability on Mars
A Reappraisal of Subtropical Subsurface Water Ice Stability on Mars Open
Massive reservoirs of subsurface water ice in equilibrium with atmospheric water vapor are found poleward of 45° latitude on Mars. The absence of CO 2 frost on steep pole‐facing slopes and simulations of atmospheric‐soil water exchanges su…
View article: Paleo‐Evolution of Martian Subsurface Ice and Its Role in the Polar Physical and Isotopic Layering
Paleo‐Evolution of Martian Subsurface Ice and Its Role in the Polar Physical and Isotopic Layering Open
Mars harbors ice deposits in several forms, on the surface and in the subsurface, which exchange with each other on various timescales. We seek to study the pore ice evolution over millennial time scales and how it contributes to and affec…
View article: The Large Array Survey Telescope—Science Goals
The Large Array Survey Telescope—Science Goals Open
The Large Array Survey Telescope (LAST) is designed to survey the variable and transient sky at high temporal cadence. The array is comprised of 48 F/2.2 telescopes of 27.9 cm aperture, coupled to full-frame backside-illuminated cooled CMO…
View article: A Reappraisal of Subtropical Subsurface Water Ice Stability on Mars
A Reappraisal of Subtropical Subsurface Water Ice Stability on Mars Open
Two arguments have suggested the presence of subsurface water ice at latitudes lower than 30\textdegree~on Mars. First, the absence of CO2 frost on pole-facing slopes was explained by the presence of subsurface ice. Second, models suggeste…
View article: Replication Data for: A Reappraisal of Subtropical Subsurface Water Ice Stability on Mars
Replication Data for: A Reappraisal of Subtropical Subsurface Water Ice Stability on Mars Open
A Reappraisal of Subtropical Subsurface Water Ice Stability on Mars L.Lange, F.Forget, M.Vincendon, A.Spiga, E.Vos, O.Aharonson, E.Millour, A.Bierjon, R.Vandemeulebrouck Laboratoire de Météorologie Dynamique Copyright 2023. All rights rese…
View article: ULTRASAT: A wide-field time-domain UV space telescope
ULTRASAT: A wide-field time-domain UV space telescope Open
The Ultraviolet Transient Astronomy Satellite (ULTRASAT) is scheduled to be launched to geostationary orbit in 2026. It will carry a telescope with an unprecedentedly large field of view (204 deg$^2$) and NUV (230-290nm) sensitivity (22.5 …
View article: The Large Array Survey Telescope -- Science Goals
The Large Array Survey Telescope -- Science Goals Open
The Large Array Survey Telescope (LAST) is designed to survey the variable and transient sky at high temporal cadence. The array is comprised of 48 F/2.2 telescopes of 27.9cm aperture, coupled to full-frame backside-illuminated cooled CMOS…
View article: Stratigraphic and Isotopic Evolution of the Martian Polar Caps From Paleo‐Climate Models
Stratigraphic and Isotopic Evolution of the Martian Polar Caps From Paleo‐Climate Models Open
Exposed scarps images and ice‐penetrating radar measurements in the North Polar Layered Deposits (NPLD) of Mars show alternating layers that provide an archive of past climate oscillations, that are thought to be linked to orbital variatio…
View article: An Accurate 3D Analytic Model for Exoplanetary Photometry, Radial Velocity, and Astrometry
An Accurate 3D Analytic Model for Exoplanetary Photometry, Radial Velocity, and Astrometry Open
We developed and provide AnalyticLC , a novel analytic method and code implementation for dynamical modeling of planetary systems, including non-coplanar interactions, based on a disturbing function expansion to fourth order in eccentricit…
View article: Physical Properties and Impact Parameter Variations of Kepler Planets from Analytic Light-curve Modeling
Physical Properties and Impact Parameter Variations of Kepler Planets from Analytic Light-curve Modeling Open
We apply AnalyticLC , an analytic model described in an accompanying paper, to interpret Kepler data of systems that contain two or three transiting planets. We perform tests to verify that the obtained solutions agree with full N -body in…
View article: The Earthlike Shoreline Morphology of Titan's Ontario Lacus
The Earthlike Shoreline Morphology of Titan's Ontario Lacus Open
Ontario Lacus' shoreline features include Earth-like rivers, deltas and flooded topography. Ontario is a dynamic lake, similar in many ways to terrestrial lakes, with active shoreline processes.
View article: GANGOTRI mission concept on the glacial key to the Amazonian climate of Mars
GANGOTRI mission concept on the glacial key to the Amazonian climate of Mars Open
Motivation and overview. The wealth of geologic information bound in Martian ice, including climate cycles, potential biomarkers
View article: New Approaches to Lunar Ice Detection and Mapping
New Approaches to Lunar Ice Detection and Mapping Open
Whitepaper #251 submitted to the Planetary Science and Astrobiology Decadal Survey 2023-2032. Topics: habitability and water; Mercury and/or the Moon; solar system formation, dynamics processes, and chronology
View article: Temporal and Spatial Analysis of Forward and Backward Microbial Contamination in a Mars Analog Mission
Temporal and Spatial Analysis of Forward and Backward Microbial Contamination in a Mars Analog Mission Open
As human exploration missions to Mars are on the horizon, microbial cross-contamination remains a key issue to address. These issues can be approached today using advances in molecular metagenomics methods, which include rapid and sensitiv…
View article: A Simplified Photodynamical Model for Planetary Mass Determination in Low-eccentricity Multitransiting Systems
A Simplified Photodynamical Model for Planetary Mass Determination in Low-eccentricity Multitransiting Systems Open
Inferring planetary parameters from transit timing variations (TTVs) is challenging for small exoplanets because their transits may be so weak that determination of individual transit timing is difficult or impossible. We implement a usefu…