Grand tack model

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The grand tack model or the grand tack hypothesis offers a possible explanation of some properties of the solar system through an assumption about its formation.

Origin of name

Tack here means turn or reversal in the nautical sense or as with a pendulum clock . But the word has many other meanings such as cross, addition, thumbtack, saddle and bridle, stickiness or, from the French, stain as in Grande Tache rouge , the big red spot of Jupiter .

The model

The inner solar system is said to have got its current form through the migration of Jupiter in the protoplanetary gas disk , first inwards to the Grand Tack, the Great Turn, at around 1.5  AU and then outwards together with Saturn .

The unexpectedly low mass of Mars and the other inner planets as well as their distances would result quite naturally.

The asteroid belt would have emptied greatly during this migration and later "repopulated"; this can be related to the spectral classes S and C that are visible today .

This also fits in with the origin of the terrestrial water : While large parts of the earth would have formed from water-poor material that was on site, water-rich material could have mixed in from far outside, which from the large planets via the asteroid belt into the inner region was scattered.

The model is also compatible with the later walks in the Nice model.

reception

The term Grand Attack was used in connection with the possibly statistically unusual lack of larger planets near the Sun in the solar system.

literature

  • Kevin J. Walsh, Alessandro Morbidelli, Sean N. Raymond, David P. O'Brien & Avi M. Mandell: A low mass for Mars from Jupiter's early gas-driven migration . In: Nature . tape 475 , no. 7041 , July 14, 2011, p. 206-209 , doi : 10.1038 / nature10201 .
  • Sean N. Raymond, Alessandro Morbidelli: The Grand Tack model: a critical review . In: Earth and Planetary Astrophysics (astro-ph.EP) . September 22, 2014, arxiv : 1409.6340 .

Individual evidence

  1. ↑ tack in the English Wiktionary
  2. ^ F. Masset, M. Snellgrove: Reversing type II migration: resonance trapping of a lighter giant protoplanet . In: Monthly Notices of the Royal Astronomical Society . Vol. 320, No. 4 , 2001, p. L55-L59 , doi : 10.1046 / j.1365-8711.2001.04159.x ( oxfordjournals.org ).
  3. ↑ Konstantin Batygin, Gregory Laughlin: Jupiter's Decisive Role in the Inner Solar System's Early Evolution . March 25, 2015, arxiv : 1503.06945 .