Michael Efroimsky
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View article: Initial Conditions for Tidal Synchronisation of a Planet by Its Moon
Initial Conditions for Tidal Synchronisation of a Planet by Its Moon Open
Moons tidally interact with their host planets and stars. A close moon is quickly synchronised by the planet or becomes captured in a higher spin–orbit resonance. However, the planet requires much more time to significantly alter its rotat…
View article: A synchronous moon as a possible source of Mars' initial triaxiality
A synchronous moon as a possible source of Mars' initial triaxiality Open
View article: A Synchronous Moon as a Possible Cause of Mars' Initial Triaxiality
A Synchronous Moon as a Possible Cause of Mars' Initial Triaxiality Open
The paper addresses the possibility of a young Mars having had a massive moon, which synchronized the rotation of Mars, and gave Mars an initial asymmetric triaxiality to be later boosted by geological processes. It turns out that a moon o…
View article: On the orbital decay of the gas giant Kepler-1658b
On the orbital decay of the gas giant Kepler-1658b Open
The gas giant Kepler-1658b has been inferred to be spiralling into its sub-giant F-type host star Kepler-1658a (KOI-4). The measured rate of change of its orbital period is $\dot{P}_{\rm orb}=-131^{+20}_{-22}\mathrm{ms/yr}$, which can be e…
View article: On the orbital decay of the gas giant Kepler-1658b
On the orbital decay of the gas giant Kepler-1658b Open
The gas giant Kepler-1658b has been inferred to be spiralling into its sub-giant F-type host star Kepler-1658a (KOI-4). The measured rate of change of its orbital period is $\stackrel{\bf \centerdot }{\textstyle {P}}_{\rm orb}\, =\, -\, 13…
View article: Is There a Semi‐Molten Layer at the Base of the Lunar Mantle?
Is There a Semi‐Molten Layer at the Base of the Lunar Mantle? Open
Parameterised by the Love number k 2 and the tidal quality factor Q , and inferred from lunar laser ranging (LLR), tidal dissipation in the Moon follows an unexpected frequency dependence often interpreted as evidence for a highly dissipat…
View article: Is there a semi-molten layer at the base of the lunar mantle?
Is there a semi-molten layer at the base of the lunar mantle? Open
Parameterised by the Love number k2 and the tidal quality factor Q, and inferred from lunar laser ranging (LLR), tidal dissipation in the Moon follows an unexpected frequency dependence often interpreted as evidence for a highly dissipativ…
View article: Pathways of survival for exomoons and inner exoplanets
Pathways of survival for exomoons and inner exoplanets Open
Context. It is conceivable that a few thousand confirmed exoplanets initially harboured satellites similar to the moons of the Solar System or larger. We ask the question of whether some of them have survived over the æons of dynamical evo…
View article: Pathways of Survival of Exomoons and Inner Exoplanets
Pathways of Survival of Exomoons and Inner Exoplanets Open
It is conceivable that a few thousand confirmed exoplanets initially harboured satellites similar to the moons of the Solar system or larger. Could some of them have survived over the aeons of dynamical evolution to the present day? The dy…
View article: Is there a semi-molten layer at the base of the lunar mantle?
Is there a semi-molten layer at the base of the lunar mantle? Open
Parameterised by the Love number $k_2$ and the tidal quality factor $Q$, and inferred from lunar laser ranging (LLR), tidal dissipation in the Moon follows an unexpected frequency dependence often interpreted as evidence for a highly dissi…
View article: Is there a semi-molten layer at the base of the lunar mantle?
Is there a semi-molten layer at the base of the lunar mantle? Open
Parameterised by the Love number k2 and the tidal quality factor Q, and inferred from lunar laser ranging (LLR), tidal dissipation in the Moon follows an unexpected frequency dependence often interpreted as evidence for a highly dissipativ…
View article: Is there a semi-molten layer at the base of the lunar mantle?
Is there a semi-molten layer at the base of the lunar mantle? Open
Parameterised by the Love number k2 and the tidal quality factor Q, and inferred from lunar laser ranging (LLR), tidal dissipation in the Moon follows an unexpected frequency dependence often interpreted as evidence for a highly dissipativ…
View article: Is there a semi-molten layer at the base of the lunar mantle?
Is there a semi-molten layer at the base of the lunar mantle? Open
Parameterised by the Love number k2 and the tidal quality factor Q, and inferred from lunar laser ranging (LLR), tidal dissipation in the Moon follows an unexpected frequency dependence often interpreted as evidence for a highly dissipativ…
View article: Tidal insights into rocky and icy bodies: An introduction and overview
Tidal insights into rocky and icy bodies: An introduction and overview Open
Solid body tides provide key information on the interior structure, evolution, and origin of the planetary bodies. Our Solar system harbours a very diverse population of planetary bodies, including those composed of rock, ice, gas, or a mi…
View article: Tidal Quality of the Hot Jupiter WASP-12b
Tidal Quality of the Hot Jupiter WASP-12b Open
WASP-12b stands out among the planets of its class of hot Jupiters because of the observed fast orbital decay attributed to tidal dissipation. The measured rate of the orbital period change is P⋅orb=−29±3ms/yr= −(9.…
View article: Tidal Quality of the Hot Jupiter WASP-12b
Tidal Quality of the Hot Jupiter WASP-12b Open
WASP-12b stands out among the planets of its class of hot Jupiters because of the observed fast orbital decay attributed to tidal dissipation. The measured rate of the orbital period change is P⋅orb=−29±3ms/yr= −(9.2±1.0)×10−10s/s. In the …
View article: Analysis of the PPN two-Body Problem using non-osculating orbital elements
Analysis of the PPN two-Body Problem using non-osculating orbital elements Open
View article: Dynamical evidence for Phobos and Deimos as remnants of a disrupted common progenitor
Dynamical evidence for Phobos and Deimos as remnants of a disrupted common progenitor Open
The origin of the Martian moons, Phobos and Deimos, remains elusive. While the morphology and their cratered surfaces suggest an asteroidal origin, capture has been questioned because of potential dynamical difficulties in achieving the cu…
View article: Initial Results from the USNO Dispersed Fourier Transform Spectrograph
Initial Results from the USNO Dispersed Fourier Transform Spectrograph Open
We have designed and constructed a "dispersed Fourier transform spectrometer" (dFTS), consisting of a conventional FTS followed by a grating spectrometer. By combining these two devices, we negate a substantial fraction of the sensitivity …
View article: Tidal evolution of the Keplerian elements
Tidal evolution of the Keplerian elements Open
View article: Report on the manuscript "On the nonlinear and Solar-forced nature of the Chandler wobble in the Earth’s pole motion"
Report on the manuscript "On the nonlinear and Solar-forced nature of the Chandler wobble in the Earth’s pole motion" Open
While the paper definitely contains an interesting and fresh idea, this idea had not been mathematically developed by the author to the level at which it is possible to judge on its viability.Accordingly, I am at this point unable to say w…
View article: Orbital relaxation and excitation of planets tidally interacting with white dwarfs
Orbital relaxation and excitation of planets tidally interacting with white dwarfs Open
Observational evidence of white dwarf planetary systems is dominated by the remains of exo-asteroids through accreted metals, debris discs, and orbiting planetesimals. However, exo-planets in these systems play crucial roles as perturbing …
View article: Tidal evolution of the Keplerian elements
Tidal evolution of the Keplerian elements Open
We address the expressions for the rates of the Keplerian orbital elements\nwithin a two-body problem perturbed by the tides in both partners. The formulae\nfor these rates have appeared in the literature in various forms, at times with\ne…
View article: Spin-orbital Tidal Dynamics and Tidal Heating in the TRAPPIST-1 Multiplanet System
Spin-orbital Tidal Dynamics and Tidal Heating in the TRAPPIST-1 Multiplanet System Open
We perform numerical simulations of the TRAPPIST-1 system of seven exoplanets orbiting a nearby M dwarf, starting with a previously suggested stable configuration. The long-term stability of this configuration is confirmed, but the motion …
View article: Exoplanet Science Priorities from the Perspective of Internal and\n Surface Processes for Silicate and Ice Dominated Worlds
Exoplanet Science Priorities from the Perspective of Internal and\n Surface Processes for Silicate and Ice Dominated Worlds Open
The geophysics of extrasolar planets is a scientific topic often regarded as\nstanding largely beyond the reach of near-term observations. This reality in no\nway diminishes the central role of geophysical phenomena in shaping planetary\no…
View article: Highly Volcanic Exoplanets, Lava Worlds, and Magma Ocean Worlds: An Emerging Class of Dynamic Exoplanets of Significant Scientific Priority
Highly Volcanic Exoplanets, Lava Worlds, and Magma Ocean Worlds: An Emerging Class of Dynamic Exoplanets of Significant Scientific Priority Open
Highly volcanic exoplanets, which can be variously characterized as 'lava worlds', 'magma ocean worlds', or 'super-Ios' are high priority targets for investigation. The term 'lava world' may refer to any planet with extensive surface lava …
View article: Exoplanet Science Priorities from the Perspective of Internal and Surface Processes for Silicate and Ice Dominated Worlds
Exoplanet Science Priorities from the Perspective of Internal and Surface Processes for Silicate and Ice Dominated Worlds Open
The geophysics of extrasolar planets is a scientific topic often regarded as standing largely beyond the reach of near-term observations. This reality in no way diminishes the central role of geophysical phenomena in shaping planetary outc…
View article: Dissipation in a tidally perturbed body librating in longitude
Dissipation in a tidally perturbed body librating in longitude Open
View article: Tidal viscosity of Enceladus
Tidal viscosity of Enceladus Open
View article: Precession relaxation of viscoelastic oblate rotators
Precession relaxation of viscoelastic oblate rotators Open
Perturbations of all sorts destabilise the rotation of a small body and leave it in a non-principal spin state. In such a state, the body experiences alternating stresses generated by the inertial forces. This yields nutation relaxation, i…