Refined stellar, orbital and planetary parameters of the eccentric HAT-P-2 planetary system

  1. András Pál1,2,3,*,
  2. Gáspár Á. Bakos1,†,
  3. Guillermo Torres1,
  4. Robert W. Noyes1,
  5. Debra A. Fischer4,
  6. John A. Johnson5,
  7. Gregory W. Henry6,
  8. R. Paul Butler7,
  9. Geoffrey W. Marcy8,
  10. Andrew W. Howard8,
  11. Brigitta Sipőcz1,3,
  12. David W. Latham1,
  13. Gilbert A. Esquerdo1

Article first published online: 26 NOV 2009

DOI: 10.1111/j.1365-2966.2009.15849.x

Issue

Monthly Notices of the Royal Astronomical Society

Monthly Notices of the Royal Astronomical Society

Volume 401, Issue 4, pages 2665–2674, February 2010

Additional Information

How to Cite

Pál, A., Bakos, G. Á., Torres, G., Noyes, R. W., Fischer, D. A., Johnson, J. A., Henry, G. W., Butler, R. P., Marcy, G. W., Howard, A. W., Sipőcz, B., Latham, D. W. and Esquerdo, G. A. (2010), Refined stellar, orbital and planetary parameters of the eccentric HAT-P-2 planetary system. Monthly Notices of the Royal Astronomical Society, 401: 2665–2674. doi: 10.1111/j.1365-2966.2009.15849.x

Author Information

  1. 1

    Harvard-Smithsonian Center for Astrophysics, 60 Garden street, Cambridge, MA 02138, USA

  2. 2

    Konkoly Observatory of the Hungarian Academy of Sciences, Konkoly Thege Miklós út 15-17, Budapest 1121, Hungary

  3. 3

    Department of Astronomy, Loránd Eötvös University, Pázmány P. st. 1/A, Budapest 1117, Hungary

  4. 4

    Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132, USA

  5. 5

    Institute for Astronomy, University of Hawaii, Honolulu, HI 96822, USA

  6. 6

    Center of Excellence in Information Systems, Tennessee State University, Nashville, TN 37209, USA

  7. 7

    Department of Terrestrial Magnetism, Carnegie Institute of Washington, Washington, DC 20015, USA

  8. 8

    Department of Astronomy, University of California, Berkeley, CA 94720, USA

*Correspondence: András Pál,

*Correspondence: E-mail: apal@szofi.net

  • ††

    NSF fellow.

Publication History

  1. Issue published online: 15 JAN 2010
  2. Article first published online: 26 NOV 2009
  3. Accepted 2009 October 8. Received 2009 October 7; in original form 2009 August 12

SEARCH

SEARCH BY CITATION

ARTICLE TOOLS

View Full Article (HTML) Get PDF (1256K)

Keywords:

  • techniques: spectroscopic;
  • stars: fundamental parameters;
  • stars: individual: HD 147506, HAT-P-2;
  • planetary systems

ABSTRACT

We present refined parameters for the extrasolar planetary system HAT-P-2 (also known as HD 147506), based on new radial velocity and photometric data. HAT-P-2b is a transiting extrasolar planet that exhibits an eccentric orbit. We present a detailed analysis of the planetary and stellar parameters, yielding consistent results for the mass and radius of the star, better constraints on the orbital eccentricity and refined planetary parameters. The improved parameters for the host star are M★= 1.36 ± 0.04 M⊙ and R★= 1.64 ± 0.08  R⊙, while the planet has a mass of Mp= 9.09 ± 0.24 MJup and radius of Rp= 1.16 ± 0.08 RJup. The refined transit epoch and period for the planet are E= 245 4387.49375 ± 0.00074 (BJD) and P= 5.6334729 ± 0.0000061 (d), and the orbital eccentricity and argument of periastron are e= 0.5171 ± 0.0033 and inline image. These orbital elements allow us to predict the timings of secondary eclipses with a reasonable accuracy of ∼15 min. We also discuss the effects of this significant eccentricity including the characterization of the asymmetry in the transit light curve. Simple formulae are presented for the above, and these, in turn, can be used to constrain the orbital eccentricity using purely photometric data. These will be particularly useful for very high precision, space-borne observations of transiting planets.

View Full Article (HTML) Get PDF (1256K)