Planet Formation
Destiny or Chance, Taylor, 2012
- Tzero = 3467 +- 2 MYA earliest crystalline material
- Triton(Neptune) 39K
- Sun 1.4% metallicity ( ~0 to 4% )
- p31 typ galaxy 1e11 stars Milky Way formed stars 10GYA
- p33 Gas clouds H2 100-1000 H/cm3, 1% of galactic volume, 10K, up to 100 LY diam, gas for 1e5 to 1e6 stars
- p34 100 KY cloud collapse to ignition
p35 red dwarf >75% 80xJupiter / Jupiter 150K accretion energy / Brown dwarf 300K
p48 Planetesimal Hypothesis dustygrains > boulders > mountains
- p49 like a spiral storm, not a uniform disk
- Goldilocks problem, too much gas, fall into sun
[7] Roberge & Kamp "Protoplanets and debris disks" in Exoplanets/Seager.2010 p285
p67 "Planetary-forming processes in our system seem to be essentially accidental and repetition of the particular sequence of events on another system seems as unlikely as multiple wins in a lottery. If planets share any common factor, it is uniqueness.
- p68 "...such comments fail to understand that planetary formation is essentially stochastic. The processes forming planets are chaotic, with all outcomes possible. Seeking one model is an illusion."
- p73 "For the ice giants, Uranus and Neptune, the answer is also clear. They formed too late to catch much gas before it was all gone."
p75 1st: accretion of bodies approaching Mars in size < 1MY 2nd: collisions for bodies the size of Earth and Venus, 100 MY
- p76 "material now in Earth and Venus probably came from the entire inner solar system" "...the final outcome, was a matter of chance"
- p78 "Chaos is a major factor in planetary growth"
Lithium depletion in solar-like stars: no planet connection / Baumann Astronomy&Astrophysics Vol 519, p. A 87, 2010
Look at Sharf again - what's with the AL26/MN26 nearby supernova?