Planet Formation around Massive Stars

Details Planet Formation around Massive Stars Planet Formation around Massive Stars

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009noao.prop..374d&link_type=abstract

NOAO Proposal ID #2009B-0374

Computer Science

Scientific paper

The directly imaged planetary systems orbiting the young A stars Fomalhaut (Kalas et al. 2008) and HR 8799 (Marois et al. 2008) present strong challenges to planet formation theories centered on solar-type stars. We suggest that planetary-mass companions are far more likely to be found on wide orbits of A stars than FGK stars for three reasons: (1) core accretion in A star disks is efficient at large radii; (2) A star planetesimal belts are highly populated and easy to excite; and (3) the high accretion rates onto young A star-disk systems aid brown dwarf formation by gravitational instability. We propose a high angular- resolution search for planetary-mass companions to A stars with mid IR- emitting dust in order to test the hypothesis that A star disks support the formation of planet-like objects on wide orbits.

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