Five New Transits of the Super-Neptune HD 149026b

We present new photometry of HD 149026 spanning five transits of its “super-Neptune” planet. In combination with previous data, we improve on the determination of the planet-to-star radius ratio: Rp/R⋆ = 0.0491+ 0.0018−0.0005. We find the planetary radius to be 0.71 ± 0.05 RJup, in accordance with previous theoretical models invoking a high metal abundance for the planet. The limiting error is the uncertainty in the stellar radius. Although we find agreement among four different ways of estimating the stellar radius, the uncertainty remains at 7%. We also present a refined transit ephemeris and a constraint on the orbital eccentricity and argument of pericenter, ecos ω = − 0.0014 ± 0.0012, based on the measured interval between primary and secondary transits.

• Publication year

  2007

• Venue

  The Astrophysical Journal

• Publication date

  2007-11-12

• Fields of study

  Physics

• Identifiers
  DOI 10.1086/527032arXiv 0711.1888
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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