Document Detail

The occurrence and mass distribution of close-in super-Earths, Neptunes, and Jupiters.
MedLine Citation:
PMID:  21030652     Owner:  NLM     Status:  In-Process    
The questions of how planets form and how common Earth-like planets are can be addressed by measuring the distribution of exoplanet masses and orbital periods. We report the occurrence rate of close-in planets (with orbital periods less than 50 days), based on precise Doppler measurements of 166 Sun-like stars. We measured increasing planet occurrence with decreasing planet mass (M). Extrapolation of a power-law mass distribution fitted to our measurements, df/dlogM = 0.39 M(-0.48), predicts that 23% of stars harbor a close-in Earth-mass planet (ranging from 0.5 to 2.0 Earth masses). Theoretical models of planet formation predict a deficit of planets in the domain from 5 to 30 Earth masses and with orbital periods less than 50 days. This region of parameter space is in fact well populated, implying that such models need substantial revision.
Andrew W Howard; Geoffrey W Marcy; John Asher Johnson; Debra A Fischer; Jason T Wright; Howard Isaacson; Jeff A Valenti; Jay Anderson; Doug N C Lin; Shigeru Ida
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  330     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-10-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  United States    
Other Details:
Languages:  eng     Pagination:  653-5     Citation Subset:  IM    
Department of Astronomy, University of California, Berkeley, CA 94720, USA.
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