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?