Origin & Evolution of Habitable Planets: Astronomical Prospective D.N.C. Lin University of California, Santa Cruz, KIAA, Peking University, with Pathways towards Habitable Planets Barcelona, Spain September 14th, 2009 S. Ida, J.L. Zhou, K. Kretke, C. Baruteau, S.L. Li, K. Schlaufman, H. Yi, J. Yan, C. Agnor, R. Laine 17 slides
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Origin & Evolution of Habitable Planets: Astronomical Prospective D.N.C. Lin University of California, Santa Cruz, KIAA, Peking University, with Pathways.
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Origin & Evolution of Habitable Planets:Astronomical Prospective
D.N.C. LinUniversity of California, Santa Cruz, KIAA, Peking University, with
Pathways towards Habitable Planets Barcelona, Spain
September 14th, 2009
S. Ida, J.L. Zhou, K. Kretke, C. Baruteau, S.L. Li, K. Schlaufman, H. Yi, J. Yan, C. Agnor, R. Laine
• Theorey of biology (From anthropic principle towards a set of deterministic laws).
2/17
Milestones
• Conceptual nebula hypothesis
• First observational discoveries
• Characterization & calibration
• Constraints of theoretical models
• Strategies for future searches
3/17
Why study gas giants first?• Easy to detect: Stimulus of different search methods• Highlight theoretical challenges: rapid formation, limited retention, & diverse evolution • Missing link to rocky planets: cores and composition• Environmental perturbers: shakers and movers of dynamical architectures• Signposts of habitats? rocky-planet oasis or desert
protoplanetary disk:H/He gas (99wt%) + dust grains (1wt%)
core accretion
gas envelope contraction
runaway gas accretion
>100M
> 5-10M
coagulation of planetesimals
terrestrialplanets
gas accretion onto cores
type I migration
type II migration
Population synthesis model Population synthesis model Ida & Lin (2004a,b,2005,2008a,b)Ida & Lin (2004a,b,2005,2008a,b)
, aini =(integration on 109y)⇒ Mp, afinal
7/17
Migration & retention
8/17
Calibration of theoretical modelsSnow line accumulation of dust and embryos
9/17
Hot Jupiters & Super Earths
10/17
Tidal &
magnetic
interaction:Inflation and m
ass losses
Stellar spin
Scattering &Kozai effect
Secular & resonant interaction in multiple systemsFormation time/space separation.Preservation of resonances
11/17
Formation after 60 Myr
Formation on 30-60 Myr
Relativistic detuning in Arae
If more than 3 giant planets form on circular orbitsOrbit crossing starts on tcross
One is ejected. The others remain in stable eccentric orbits.
inner one: radial velocity outer one: direct imaging
tcross
Origin of eccentric planets: jumping jupiterOrigin of eccentric planets: jumping jupiterWeidenschilling & Marzari (1996), Lin & Ida(1997),Zhou et al (2007)
Stellar mass/metallicity dependenceStellar mass/metallicity dependence Theory: disk mass & migration play key rolesTheory: disk mass & migration play key roles
next challenges next challenges (both observation and (both observation and theory)theory) gas giants gas giants
Dynamical structure in multiple systemsDynamical structure in multiple systems Diversity: atmosphere, structure, & Diversity: atmosphere, structure, &
compositioncomposition super-Earthssuper-Earths
Close-in super-Earths are abundantClose-in super-Earths are abundant Habitable planets around M dwarfsHabitable planets around M dwarfs Long-term stability of planetary systemsLong-term stability of planetary systems