Presentation on theme: "The Grand Tack Scenario: Reconstructing The Migration History Of Jupiter And Saturn In The Disk Of Gas Alessandro Morbidelli (OCA, Nice) Kevin Walsh (SWRI,"— Presentation transcript:
1 The Grand Tack Scenario: Reconstructing The Migration History Of Jupiter And Saturn In The Disk Of GasAlessandro Morbidelli (OCA, Nice)Kevin Walsh (SWRI, Boulder)Sean Raymond (CNRS, Bordeaux)David O’Brien (PSI, Tucson)Avi Mandell (NASA Goddard)HELMHOLTZ ALLIANCE: Planetary Evolution and Life
2 Probably responsible for the origin of Hot and Warm Jupiters Migration of giant planets embedded in a gas-disk seems to be a generic process.Probably responsible for the origin of Hot and Warm JupitersWhy then Jupiter is not in the terrestrial planet zone?Our giant planets, somehow, did not migrate significantlyOur giant planets migrated significantly but ended up onto their distant orbits because of their specific properties (mass ratio & accretion history)
3 Hydro-dynamical simulation of the evolution of Jupiter and Saturn in a gas-disk (Masset and Snellgrove, 2001; Morbidelli and Crida, 2007; Pierens and Nelson, 2008;…)SaturnOrbital radius2/3 resonance lockingJupiterTime
4 How far inwards did Jupiter go? Is there any evidence for such inward-then-outward migration of Jupiter?How far inwards did Jupiter go?To answer these questions we need to turn to constraints:TERRESTRIAL PLANETSASTEROID POPULATIONS
5 ..produce a Mars analog systematically too big! Terrestrial Planets formation from a disk of planetesimals and planetary embryos, ranging from the Sun to Jupiter’s current orbit….Raymond et al., 2009..produce a Mars analog systematically too big!
6 Hansen, 2009Outer 1.0 AU?Ida & Lin, 2008Inner 0.7 AU
7 Can the “Grand Tack” of Jupiter explain this? We did simulations assuming a Grand Tack evolution scenario, with Jupiter reversing migration at ~1.5 AUGrand Tack
10 The Grand Tack scenario explains: Why Jupiter is not currently in the inner solar systemThe structure of the terrestrial planet system (large mass ratio Earth/Mars)The structure of the asteroid belt (mass deficit, co-existence of two different classes of asteroids)The initial conditions of the “Nice model” (all giant planets in resonance with each other), which then explains the origin of the current architecture of the outer Solar SystemTURNING THE ARGUMENT AROUND:We believe that there is substantial evidence in the current structure of the Solar System for a wide-range migration of Jupiter and Saturn in the solar nebula of the Grand Tack type
11 PLACING THE SOLAR SYSTEM IN CONTEXT Our model for the evolution of the Solar System highlights the importance of a few yes/no events that alone can explain most of the diversity that we seeSuppose giant planets form from a system of cores near the snowline and that they grow in mass sequence, from the innermost to the outermost oneFirst event:Does the second, lighter planet catch the first one in resonance?Yes/NoFor the Solar System the answer is YESFor HD 12661, HD , HIP14810 the answer is NO
12 Second event:Does the second planet eventually grow as massive or more massive than the inner one?Yes/NoFor the Solar System (or OGLE L) the answer is NOFor many/most other systems the answer could be YESIf the outer planet eventually exceeds in mass the inner one, inward migration starts again
13 Migration drives the inner, lighter planet to become eccentric Gliese 876Kley et al. 2004, 2005; Crida et al., 2008Migration drives the inner, lighter planet to become eccentricThird event:Does the eccentricity saturate ?Yes/NoFor the pairs of stable resonant planets: YESFor eccentric single planets (which presumably got unstable at some time): NO
14 Eccentric single planets resonant pairs (Gliese 876) CONCLUSIONSThree events can explain most of the observed diversity:Does the second, lighter planet catch the first one in resonance?NOYESDoes the second planet eventually grow as massive or more massive than the inner one?HD 12661& Co.NOYESDoes the eccentricity saturate ?Solar SystemNOYESFor more discussion see my chapter “Dynamics of Planetary Systems” available on AstroPHEccentric single planetsresonant pairs (Gliese 876)
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