Newly-Discovered Planets Orbiting HD 5319, HD 11506, HD 75784 and HD 10442 from the N2K Consortium

Creators: Giguere, Matthew J.; Fischer, Debra A.; Payne, Matthew J.; Brewer, John M.; Johnson, John Asher; Howard, Andrew W.; Isaacson, Howard T.

Abstract

Initially designed to discover short-period planets, the N2K campaign has since evolved to discover new worlds at large separations from their host stars. Detecting such worlds will help determine the giant planet occurrence at semi-major axes beyond the ice line, where gas giants are thought to mostly form. Here we report four newly discovered gas giant planets (with minimum masses ranging from 0.4 to 2.1 M_(Jup)) orbiting stars monitored as part of the Next 2000 target stars (N2K) Doppler Survey program. Two of these planets orbit stars already known to host planets: HD 5319 and HD 11506. The remaining discoveries reside in previously unknown planetary systems: HD 10442 and HD 75784. The refined orbital period of the inner planet orbiting HD 5319 is 641 days. The newly discovered outer planet orbits in 886 days. The large masses combined with the proximity to a 4:3 mean motion resonance make this system a challenge to explain with current formation and migration theories. HD 11506 has one confirmed planet, and here we confirm a second. The outer planet has an orbital period of 1627.5 days, and the newly discovered inner planet orbits in 223.6 days. A planet has also been discovered orbiting HD 75784 with an orbital period of 341.7 days. There is evidence for a longer period signal; however, several more years of observations are needed to put tight constraints on the Keplerian parameters for the outer planet. Lastly, an additional planet has been detected orbiting HD 10442 with a period of 1043 days.

Additional Information

© 2015 American Astronomical Society. Received 2014 April 1. Accepted 2014 November 16. Published 2015 January 19. We thank the referee for useful comments and suggestions. We are grateful to Geoff Marcy for his longstanding contributions to this program and for helping with the observing and data reduction. We also thank Camille Avestruz, Ana Bonaca, Kristina Douglas, Aurelia Giguere, Haven Giguere, Nicole Larsen, Jack Moriarty, and Adele Plunkett for useful discussions. We gratefully acknowledge the dedication and support of the Keck Observatory staff, in particular Grant Hill and Scott Dahm for their support with HIRES and Greg Wirth, Bob Kibrick, Craig Henry and Andrew Stemmer for supporting remote observing. We thank the NASA and Yale Telescope assignment committees for generous allocations of telescope time. This work was supported by NASA Headquarters under the NASA Earth and Space Science Fellowship Program—Grant NNX13AM15H. Fischer acknowledges support from NASA grant NNX08AF42G and NASA Keck PI data analysis funds. This research has made use of the Extrasolar Planets Encyclopedia, available at exoplanet.eu, and the Exoplanet Orbit Database at exoplanets.org. This research has also made use of the SIMBAD database, operated at CDS, Strasbourg, France. Data presented herein were obtained at the W. M. Keck Observatory from telescope time allocated to the National Aeronautics and Space Administration through the agency's scientific partnership with the California Institute of Technology and the University of California. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors extend thanks to those of native Hawaiian ancestry on whose sacred mountain of Mauna Kea we are privileged to be guests. Without their generous hospitality, the Keck observations presented herein would not have been possible.

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