NOAO >   Observing Info >   Approved Programs >   2014B-0072

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Proposal Information for 2014B-0072


PI: Ji Wang, Yale University, ji.wang@yale.edu
Address: Department of Astronomy, PO Box 208101, New Haven, CT 06520-8101, USA

CoI: Debra Fischer, Yale University
CoI: Steve Howell, NASA Ames Research Center
CoI: Elliott Horch, Southern Conneticut State University

Title: What Causes the Migration of Hot Jupiters?

Abstract: The existence of many hot Jupiters may be one of the most striking discoveries for the past century. Since they could not have formed in situ because of a lack of building materials, hot Jupiters must migrate inward to their current positions. A few mechanisms have been proposed to explain the inward migration, e.g., disk-driven migration, planet-planet scattering, and Kozai perturbation due to a distant star. However, it is still under debate on which mechanism dominates. Here, we propose to conduct a dedicated survey for stellar companions to a sample of hot Jupiter host stars. Unlike previous host stars from the RV sample, these host stars from the Kepler sample have little bias against binary stars. We will take advantage of the high spatial resolution of the Gemini-N Differential Speckle Survey Instrument (DSSI) to search for stellar companions. The speckle imaging data will be complemented by the radial velocity data to be taken through Yale Palomar time, thus constructing a survey with higher than 80% completeness. With a nearly complete survey to a non-biased sample, we will determine the dominant mechanism for hot Jupiter inward migration.


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