Homogeneous studies of transiting extrasolar planets – IV. Thirty systems with space-based light curves

By J. Southworth. 2011

377 citations recorded by the source corpus.

I calculate the physical properties of 32 transiting extrasolar planet and brown-dwarf systems from existing photometric observations and measured spectroscopic parameters. The systems studied include fifteen observed by the CoRoT satellite, ten by Kepler and five by the Deep Impact spacecraft. Inclusion of the objects studied in previous papers leads to a sample of 58 transiting systems with homogeneously measured properties. The Kepler data include observations from Quarter 2, and my analyses of several of the systems are the first to be based on short-cadence data from this satellite. The light curves are modelled using the JKTEBOP code, with attention paid to the treatment of limb darkening, contaminating light, orbital eccentricity, correlated noise, and numerical integration over long exposure times. The physical properties are derived from the light curve parameters, spectroscopic characteristics of the host star, and constraints from five sets of theoretical stellar model predictions. An alternative approach using a calibration from eclipsing binary star systems is explored and found to give comparable results whilst imposing a much smaller computational burden. My results are in good agreement with published properties for most of the transiting systems, but discrepancies are identified for CoRoT-5, CoRoT-8, CoRoT-13, Kepler-5 and Kepler-7. Many of the errorbars quoted in the literature are underestimated. Refined orbital ephemerides are given for CoRoT-8 and for the Kepler planets. Asteroseismic constraints on the density of the host stars are in good agreement with the photometric equivalents for HD17156 and TrES-2, but not for HAT-P-7 and HAT-P-11. Complete error budgets are generated for each transiting system, allowing identification of the observations best-suited to improve measurements of their physical properties. Whilst most systems would benefit from further photometry and spectroscopy, HD17156, HD80606, HAT-P-7 and TrES-2 are now extremely well characterised. HAT-P-11 is an exceptional candidate for studying starspots. The orbital ephemerides of some transiting systems are becoming uncertain and they should be re-observed in the near future. The primary results from the current work and from previous papers in the series have been placed in an online catalogue, from where they can be obtained in a range of formats for reference and further study. TEPCat is available at http://www.astro.keele.ac.uk/ jkt/tepcat/

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/031eb0d86e227b1b08694a5f46ec625d92866c23

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In Astronomy and Astrophysics

1. Timothy Morton
2. D. Charbonneau
3. G. Marcy
4. D. Huber
5. E. Petigura
6. Andrew W. Howard
7. J. Winn
8. Jon Fortney

In Instrumentation

1. Timothy Morton
2. G. Marcy
3. E. Petigura
4. D. Charbonneau
5. D. Huber
6. Andrew W. Howard
7. J. Winn
8. B. Fulton

Citations in the corpus

• PASTIS: Bayesian extrasolar planet validation. I. General framework, models, and performance (2014, methodology): “The light curves of planets and FPs are modelled using a modified version of EBOP code (Nelson & Davis 1972; Etzel 1981; Popper & Etzel 1981) which was extracted from the JKTEBOP package (Southworth 2011, and references therein).”
• PROBABILISTIC FORECASTING OF THE MASSES AND RADII OF OTHER WORLDS (2016, methodology): “For extrasolar planets, we used the TEPCat catalog4 of “wellstudied transiting planets,” curated by John Southworth (Southworth 2008, 2009, 2010, 2011, 2012).”
• Asteroseismology of Solar-Type and Red-Giant Stars (2013, result): “As noted by Southworth (2011) the asteroseismic densities are in good agreement with the lightcurvederived densities for TrES-2 and HD 17156, but not for HAT-P-7 and HAT-P-11.”
• FUNDAMENTAL PROPERTIES OF KEPLER PLANET-CANDIDATE HOST STARS USING ASTEROSEISMOLOGY (2013, positive): “We have also compared our results for Kepler-4 and Kepler-14 with stellar properties published by Southworth (2011, 2012) and found good agreement within 1σ for mass and radius.”
• A NEARBY M STAR WITH THREE TRANSITING SUPER-EARTHS DISCOVERED BY K2 (2015, methodology): “…Curve Fitting We analyze the photometry using standard Pythonbased minimizers, the emcee Markov Chain Monte-Carlo (MCMC) package (Foreman-Mackey et al. 2013), and the JKTEBOP lightcurve code (Southworth et al. 2004; Southworth 2011) using numerical integration to account for our ∼30-min cadence.”
• TERRESTRIAL PLANET OCCURRENCE RATES FOR THE KEPLER GK DWARF SAMPLE (2015, background): “…effects, orbital eccentricity, and 13 third light contamination to name a few (Mandel & Agol 2002; Seager & Mallén-Ornelas 2003; Giménez 2006; Holman et al. 2006; Burke et al. 2007; Torres et al. 2008; Southworth 2011; Kipping 2014; Rowe et al. 2015; Mullally et al. 2015; Ciardi et al. 2015).”
• STARSPOTS, SPIN–ORBIT MISALIGNMENT, AND ACTIVE LATITUDES IN THE HAT-P-11 EXOPLANETARY SYSTEM (2011, methodology): “While preparing this paper we learned that two other analyses of the publicKepler data have been undertaken, by Southworth (2011) and by Deming et al. (2011).”