CaltechAUTHORS
Published June 1, 2011 | Version Published
Journal Article Open

Hat-P-28b and Hat-P-29b: Two Sub-Jupiter Mass Transiting Planets

Creators

  • 1. ROR icon Harvard-Smithsonian Center for Astrophysics
  • 2. ROR icon University of Copenhagen
  • 3. ROR icon Nordic Optical Telescope Scientific Association
  • 4. ROR icon Konkoly Observatory
  • 5. ROR icon Las Cumbres Observatory Global Telescope Network
  • 6. ROR icon University of California, Santa Barbara
  • 7. ROR icon Yale University
  • 8. ROR icon California Institute of Technology
  • 9. ROR icon University of California, Berkeley
  • 10. ROR icon Hungarian Astronomical Association

Abstract

We present the discovery of two transiting exoplanets. HAT-P-28b orbits a V = 13.03 G3 dwarf star with a period P = 3.2572 days and has a mass of 0.63 ± 0.04 M_J and a radius of 1.21^(+0.11)_(–0.08) R_J yielding a mean density of 0.44 ± 0.09 g cm^(–3). HAT-P-29b orbits a V = 11.90 F8 dwarf star with a period P = 5.7232 days and has a mass of 0.78^(+0.08)_(–0.04) M_J and a radius of 1.11^(+0.14)_(–0.08) R_J yielding a mean density of 0.71 ± 0.18 g cm^(–3). We discuss the properties of these planets in the context of other known transiting planets.

Additional Information

© 2011 The American Astronomical Society. Received 2011 January 17; accepted 2011 March 24; published 2011 May 16. Based in part on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. Based in part on observations obtained at the W. M. Keck Observatory, which is operated by the University of California and the California Institute of Technology. Keck time has been granted by NOAO (A201Hr) and NASA (N018Hr, N167Hr). HATNet operations have been funded by NASA grants NNG04GN74G, NNX08AF23G and SAO IR&D grants. Work of G.A´ .B. was supported by the Postdoctoral Fellowship of the NSF Astronomy and Astrophysics Program (AST-0702843 and AST-0702821, respectively). G.T. acknowledges partial support from NASA grant NNX09AF59G. We acknowledge partial support also from the Kepler mission under NASA Cooperative Agreement NCC2-1390 (PI: D.W.L.). G.K. thanks the Hungarian Scientific Research Foundation (OTKA) for support through grant K-81373. This research has made use of Keck telescope time granted through NOAO (program A201Hr) and NASA (N018Hr, N167Hr). This paper uses observations obtained with facilities of the Las Cumbres Observatory Global Telescope and the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. We thank to Johan Fynbo for help on the distance estimate.

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Additional details

Identifiers

Eprint ID
23910
Resolver ID
CaltechAUTHORS:20110606-085236123

Funding

NASA
NNG04GN74G
NASA
NNX08AF23G
Smithsonian Astrophysical Observatory
NSF Astronomy and Astrophysics Fellowship
AST-0702843
NSF Astronomy and Astrophysics Fellowship
AST-0702821
NASA
NNX09AF59G
NASA
NCC2-1390
Hungarian Scientific Research Fund (OTKA)
K-81373
National Optical Astronomy Observatory (NOAO)
A201Hr
NASA
N018Hr
NASA
N167Hr

Dates

Created
2011-06-06
Created from EPrint's datestamp field
Updated
2021-11-09
Created from EPrint's last_modified field