The Transit Light Curve Project. I. Four Consecutive Transits of the Exoplanet XO‐1b

2006/07/25 by Matthew J. Holman, Joshua N. Winn, David W. Latham +11 · 14 citations
Physics and Astronomy · #Adaptive optics and wavefront sensing #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Exoplanet #Light curve #Photometry (optics) #Physics #Planet #Planetary system #RADIUS #Star formation #Stars #Stellar density #Stellar mass #Stellar, planetary, and galactic studies #Transit (satellite) #astro-ph

paper · pdf · doi:10.1086/508155

published as Astrophys.J.652:1715-1724,2006 · 22 pages, 5 figures, 2 tables. Accepted for publication in ApJ

arxiv created 2006/07/25 · openalex publication_date 2006/11/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We present RIz photometry of four consecutive transits of the newly discovered exoplanet XO-1b. We improve on the estimates of the transit parameters, finding the planetary radius to be R P = 1.184 R J , and the stellar radius to be R ⋆ = 0.928 R ☉ , assuming a stellar mass of M ⋆ = (1.00 ± 0.03) M ☉ . The uncertainties in the planetary and stellar radii are dominated by the uncertainty in the stellar mass. These uncertainties increase by a factor of 2-3 if a more conservative uncertainty of 0.10 M ☉ is assumed for the stellar mass. Our estimate of the planetary radius is smaller than that reported by McCullough and coworkers, and the resulting estimate for the mean density of XO-1b is intermediate between that of the low-density planet HD 209458b and the higher density planets TrES-1 and HD 189733b. The timings of the transits have an accuracy ranging from 0.2 to 2.5 minutes and are marginally consistent with a uniform period.

Citations

• Towards Better Age Estimates for Stellar Populations: The Y² Isochrones for Solar Mixture
• Obliquity Tides on Hot Jupiters
• A Transiting Planet of a Sun‐like Star
• High-Resolution Spectroscopy of the Transiting Planet Host Star TrES-1
• Transit Photometry of the Core‐dominated Planet HD 149026b
• Refined Parameters of the Planet Orbiting HD 189733
• Inference from Iterative Simulation Using Multiple Sequences

Cited by

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• Improved Measurement of the Rossiter–McLaughlin Effect in the Exoplanetary System HD 17156
• Prospects for the Characterization and Confirmation of Transiting Exoplanets via the Rossiter‐McLaughlin Effect
• HAT‐P‐1b: A Large‐Radius, Low‐Density Exoplanet Transiting One Member of a Stellar Binary
• Tight constraints on the existence of additional planets around HD 189733
• The Transit Light Curve Project. II. Two Transits of the Exoplanet OGLE-TR-111b
• The Transit Light Curve Project. III. Tres Transits of TrES‐1
• HAT-P-9b: A LOW-DENSITY PLANET TRANSITING A MODERATELY FAINT F STAR
• Measurement of the Spin‐Orbit Angle of Exoplanet HAT‐P‐1b
• A PROGRADE, LOW-INCLINATION ORBIT FOR THE VERY HOT JUPITER WASP-3b
• The Transit Light Curve Project. IX. Evidence for a Smaller Radius of the Exoplanet XO‐3b
• A SUPER-EARTH TRANSITING A NAKED-EYE STAR
• THE TRANSIT LIGHT-CURVE PROJECT. XIV. CONFIRMATION OF ANOMALOUS RADII FOR THE EXOPLANETS TrES-4b, HAT-P-3b, AND WASP-12b
• Homogeneous studies of transiting extrasolar planets – I. Light-curve analyses