Mathematics – Probability
Scientific paper
Aug 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010noao.prop..503d&link_type=abstract
NOAO Proposal ID #2010B-0503
Mathematics
Probability
Scientific paper
Our current understanding of the process of planet formation indicates that exoplanets arise from the natal gas+dust disks of young pre-main-sequence stars. Statistical studies of the 440+ Galactic exoplanets identified to date suggest that the metallicity of the parent circumstellar envelope may influence the formation (or identification) of planets. This metallicity dependence motivates the study of protoplanetary disks in environments such as the LMC and SMC, which have substantially lower metallicities (Z=0.002-0.007) than that of our Galaxy (Z ~0.018). Unfortunately, identifying bona-fide protoplanetary disk systems in the SMC/LMC has proven difficult; detailed spectroscopic and photometric studies of candidate Herbig Ae/Be stars suggest most are actually main-sequence classical Be stars. We propose to continue our successful 2009B and 2008B programs of obtaining the first spectropolarimetric observations of candidate Herbig Ae/Be stars and to conduct field imaging polarimetry of high probability candidate YSOs which are considered likely to be pre-main-sequence targets, to a) provide clear evidence that these objects are not evolved stars; and b) perform statistical comparisons of these SMC/LMC YSOs compared to their Galactic counterparts.
Bjorkman Jon E.
Bjorkman Karen S.
Davidson James W. Jr.
Magalhaes Antonio Mario
Vijh Uma P.
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