From Stars to Planets Gainesville 14 April 2007 Short-lived radioisotopes: A cosmochemical...
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Transcript of From Stars to Planets Gainesville 14 April 2007 Short-lived radioisotopes: A cosmochemical...
![Page 1: From Stars to Planets Gainesville 14 April 2007 Short-lived radioisotopes: A cosmochemical connection between star and planet formation Eric Gaidos 1,3.](https://reader036.fdocuments.us/reader036/viewer/2022070605/5a4d1ae97f8b9ab059979f72/html5/thumbnails/1.jpg)
From Stars to Planets Gainesville 14 April 2007
Short-lived radioisotopes:A cosmochemical connection
between star and planet formation
Eric Gaidos1,3 Jonathan Williams2,3
Nick Moskovitz2
Daniel Rogerrs4
1Department of Geology & Geophysics2Institute for Astronomy3NASA Astrobiology Institute4Department of Physics & AstronomyUniversity of Hawaii at Manoa
Launch of COROT
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From Stars to Planets Gainesville 14 April 2007
Armstrong et al. (1984)
Evidence for live 26Al in the early Solar System
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From Stars to Planets Gainesville 14 April 2007 Markowski et al. (2006)
Early (<2 Myr) differentiation of some meteorite parent bodies
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From Stars to Planets Gainesville 14 April 2007
Evidence for the homogeneity of 26Al
Thrane et al. (2006)
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From Stars to Planets Gainesville 14 April 2007
Bizzarro et al. (2006)
Absence of 60Fe in iron meteorite parent bodies?
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From Stars to Planets Gainesville 14 April 2007
Contribution to 26Al by Wolf-Rayet winds
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From Stars to Planets Gainesville 14 April 2007
Meynet & Maeder (2005)
26Al
60Fe
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From Stars to Planets Gainesville 14 April 2007
Overlapping time scales
Half life of 26Al 0.72 Myr
Massive star lifetime >3 Myr
Protostar and disk lifetime 1-5 Myr
Cluster dispersal time 1-10 Myr
Accretion time scale 1-10 Myr
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From Stars to Planets Gainesville 14 April 2007
N-body simulations of a 9000-star cluster containing a 60 solar-mass (O3) star
and ~270 solar mass (0.9-1.1) stars
t = 0 t = 3 Myr
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From Stars to Planets Gainesville 14 April 2007
Williams & Gaidos, in prep.
N = 9000
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From Stars to Planets Gainesville 14 April 2007
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From Stars to Planets Gainesville 14 April 2007
Cumulative distribution of relative 26Al inventories
0.1X 10X1X
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From Stars to Planets Gainesville 14 April 2007
Thermal histories of 3-km planetesimals with Solar, 0.1X, and 10X 26Al
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From Stars to Planets Gainesville 14 April 2007
Fractional Mass Experiencing Temperatures < 700K
0
0.2
0.4
0.6
0.8
1
0 2 4 6 8 10 12 14 16 18 20
Accretion Timescale [Myr]
1X0.1X10X
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From Stars to Planets Gainesville 14 April 2007
Leger et al. (2004)
Less dehydration: Ocean worlds?
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From Stars to Planets Gainesville 14 April 2007
Disk injection scenario
• Single O3 (60 solar-mass star) in 500 star cluster
• Plummer sphere with specified core radius and virial parameter ≥0.5 reflecting gas loss (Bastian & Goodwin 2006)
• Simulation stopped at 3.8 Myr • Yield of 26Al in wind from Limongi &
Chieffi (2006)• Injection efficiency of 100%; no decay
during time of flight• Mass fraction of 26Al calculated according
to Looney et al. (2006):
time of flight of ejecta
ss
ti
i DeMfX
2
/2ln
4
2/1
injection efficiency
mass of isotope in ejecta
distance from SS to progenitor
surface density of SS
solar system value; 26Al/27Al = 5.85 × 10-5
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From Stars to Planets Gainesville 14 April 2007
g = 0.5
g = 0.9
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From Stars to Planets Gainesville 14 April 2007
Denizens of a low 26Al world....