[1] Eureka Sci, Oakland, CA 96002 USA
[2] NASA, Goddard Space Flight Ctr, ExoPlanets & Stellar Astrophys Lab, Greenbelt, MD 20771 USA
[3] NASA, Goddard Space Flight Ctr, Goddard Ctr Astrobiol, Greenbelt, MD 20771 USA
[4] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
[5] Space Sci Inst, Boulder, CO 80301 USA
[6] Univ Cincinnati, Dept Phys, Cincinnati, OH 45221 USA
[7] Univ Louisville, Dept Phys, Louisville, KY 40292 USA
[8] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[9] Catholic Univ Amer, Dept Phys, Washington, DC 20064 USA
[10] NASA, Goddard Space Flight Ctr, CRESST, Xray Astrophys Lab, Greenbelt, MD 20771 USA
[11] Univ Maryland Baltimore Cty, Dept Phys, Baltimore, MD 21250 USA
[12] Clemson Univ, Dept Phys & Astron, Clemson, SC 29634 USA
[13] Osaka Univ, Grad Sch Sci, Dept Earth & Space Sci, Toyonaka, Osaka 5600043, Japan
[14] Max Planck Inst Astron, D-69117 Heidelberg, Germany
[15] Aerosp Corp, Los Angeles, CA 90009 USA
[16] CNRS UJF, Lab Astrophys Grenoble, UMR 5571, Grenoble, France
[17] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA