NOAO >   Observing Info >   Approved Programs >   2010A-0136

Small NOAO Logo

Proposal Information for 2010A-0136


PI: Joseph Carson, Max Planck Institute for Astronomy, jcarson@mpia.de
Address: Koenigstuhl 17 , 69117 Heidelberg, Germany

CoI: Christian Thalmann, Max Planck Institute for Astronomy
CoI: Markus Janson, University of Toronto
CoI: Miwa Goto, Max Planck Institute for Astronomy
CoI: Michael McElwain, Princeton University
CoI: Markus Feldt, Max Planck Institute for Astronomy
CoI: Thomas Henning, Max Planck Institute for Astronomy
CoI: Motohide Tamura, National Astronomical Observatory of Japan

Title: Coldest Imaged Companion of a Sun-Like Star

Abstract: In May and August 2009, we and collaborators used Adaptive Optics H-band direct-imaging to discover a 28 AU (projected separation) planet or brown-dwarf companion to the solar-type star GJ 758. The measured photometry and astrometry indicated a 10-40 Jupiter mass bound companion with a temperature of 550-640K. The discovery (submitted in Sep 2009 to Science Express) marks the coldest companion of a star ever imaged in thermal light. The companion is also a candidate for the coldest object ever thermally imaged outside our solar system. We propose to use Gemini NIRI to conduct multi-band photometry and astrometry of this remarkable object. The astrometry, combined with the previous data, will allow us to observe significant orbital motion, thus constraining semi-major axis, eccentricity, and object mass. Photometry (in J, H, K-cont, CH4-short, and CH4-long filters) will provide better constraints on object temperature and mass, while also giving us a first-ever glimpse into the atmosphere of the coldest imaged companion of a sun-like star.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2010A-0136

noaoprop-help@noao.edu

Small NOAO Logo