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A new perspective on interiors of ice-rich planets: Ice-rock mixture instead of ice on top of rock
Allona Vazan, Re'em Sari, Ronit Kessel
Ice-rich planets are formed exterior to the water ice-line and thus are expected to contain a substantial amount of ices. The high ice content leads to unique conditions in the int…
Deep and wide gaps by super Earths in low-viscosity discs
Sivan Ginzburg, Re'em Sari
Planets can open cavities (gaps) in the protoplanetary gaseous discs in which they are born by exerting gravitational torques. Viscosity counters these torques and limits the deple…
Modal Decomposition of TTV - Inferring Planet Masses and Eccentricities
Itai Linial, Shmuel Gilbaum, Re'em Sari
Transit timing variations (TTVs) are a powerful tool for characterizing the properties of transiting exoplanets. However, inferring planet properties from the observed timing varia…
A spectral approach to transit timing variations
Aviv Ofir, Ji-Wei Xie, Chao-Feng Jiang +2
The high planetary multiplicity revealed by Kepler implies that Transit Time Variations (TTVs) are intrinsically common. The usual procedure for detecting these TTVs is biased to l…
Core-powered mass loss and the radius distribution of small exoplanets
Sivan Ginzburg, Hilke E. Schlichting, Re'em Sari
Recent observations identify a valley in the radius distribution of small exoplanets, with planets in the range significantly less common than somewhat…
Hot-Jupiter Core Mass from Roche-lobe Overflow
Sivan Ginzburg, Re'em Sari
The orbits of many observed hot Jupiters are decaying rapidly due to tidal interaction, eventually reaching the Roche limit. We analytically study the ensuing coupled mass loss and…
Tidal Heating of Young Super-Earth Atmospheres
Sivan Ginzburg, Re'em Sari
Short-period Earth to Neptune size exoplanets (super-Earths) with voluminous gas envelopes seem to be very common. These gas atmospheres are thought to have originated from the pro…
Blackbody Radiation from Isolated Neptunes
Sivan Ginzburg, Re'em Sari, Abraham Loeb
Recent analyses of the orbits of some Kuiper Belt objects hypothesize the presence of an undiscovered Neptune-size planet at a very large separation from the Sun. The energy budget…
Super-Earth Atmospheres: Self-Consistent Gas Accretion and Retention
Sivan Ginzburg, Hilke E. Schlichting, Re'em Sari
Some recently discovered short-period Earth to Neptune sized exoplanets (super Earths) have low observed mean densities which can only be explained by voluminous gaseous atmosphere…
Extended Heat Deposition in Hot Jupiters: Application to Ohmic Heating
Sivan Ginzburg, Re'em Sari
Many giant exoplanets in close orbits have observed radii which exceed theoretical predictions. One suggested explanation for this discrepancy is heat deposited deep inside the atm…
Hot-Jupiter Inflation due to Deep Energy Deposition
Sivan Ginzburg, Re'em Sari
Some extrasolar giant planets in close orbits---"hot Jupiters"---exhibit larger radii than that of a passively cooling planet. The extreme irradiation these hot Jupite…
Atmospheric Mass Loss During Planet Formation: The Importance of Planetesimal Impacts
Hilke Schlichting, Re'em Sari, Almog Yalinewich
We quantify the atmospheric mass loss during planet formation by examining the contributions to atmospheric loss from both giant impacts and planetesimal accretion. Giant impacts c…
Spins of large asteroids: Hint on a primordial distribution of their spin rates
Elad Steinberg, Re'em Sari
The Asteroid Belt and the Kuiper Belt are relics from the formation of our solar system. Understanding the size and spin distribution of the two belts is crucial for a deeper under…
Measuring the Abundance of sub-kilometer sized Kuiper Belt Objects using Stellar Occultations
Hilke E. Schlichting, Eran O. Ofek, Re'em Sari +6
We present here the analysis of about 19,500 new star hours of low ecliptic latitude observations (|b| < 20 deg) obtained by the Hubble Space Telescope's FGS over a time span of mo…
Sterile and Fertile Planetary Systems - Statistical Analysis of Multi-Planet Systems in Kepler's data
Amir Weissbein, Elad Steinberg, Re'em Sari
The Kepler mission has discovered a large number of planetary systems. We analyze the implications of the discovered single/multi-exoplanet systems from Kepler's data. As done in p…
Runaway Growth During Planet Formation: Explaining the Size Distribution of Large Kuiper Belt Objects
Hilke E. Schlichting, Reem Sari
Runway growth is an important stage in planet formation during which large protoplanets form, while most of the initial mass remains in small planetesimals. The amount of mass conv…
A Unified Theory for the Effects of Stellar Perturbations and Galactic Tides on Oort Cloud Comets
Benjamin F. Collins, Re'em Sari
We examine the effects of passing field stars on the angular momentum of a nearly radial orbit of an Oort cloud comet bound to the Sun. We derive the probability density function (…
Binary YORP and Evolution of Binary Asteroids
Elad Steinberg, Re'em Sari
The rotation states of kilometer sized near earth asteroids are known to be affected by the YORP effect. In a related effect, Binary YORP (BYORP) the orbital properties of a binary…
Transits of Transparent Planets - Atmospheric Lensing Effects
Omer Sidis, Re'em Sari
Light refracted by the planet's atmosphere is usually ignored in analysis of planetary transits. Here we show that refraction can add shoulders to the transit light curve, i.e., an…
Equilibrium Configurations of Synchronous Binaries: Numerical Solutions and Application to Kuiper-Belt Binary 2001 QG298
Orly Gnat, Re'em Sari
We present numerical computations of the equilibrium configurations of tidally-locked homogeneous binaries, rotating in circular orbits. Unlike the classical Roche approximations,…
A single sub-km Kuiper Belt object from a stellar Occultation in archival data
H. E. Schlichting, E. O. Ofek, M. Wenz +5
The Kuiper belt is a remnant of the primordial Solar System. Measurements of its size distribution constrain its accretion and collisional history, and the importance of material s…
The Creation of Haumea's Collisional Family
Hilke E. Schlichting, Re'em Sari
Recently, the first collisional family was discovered in the Kuiper belt. The parent body of this family, Haumea, is one of the largest objects in the Kuiper belt and is orbited by…