A survey of eight hot Jupiters in secondary eclipse using WIRCam at CFHT

Eder Martioli, Knicole D. Colón, Daniel Angerhausen, Keivan G. Stassun, Joseph E. Rodriguez, George Zhou, B. Scott Gaudi, Joshua Pepper, Thomas G. Beatty, Ramarao Tata, David J. James, Jason D. Eastman, Paul Anthony Wilson, Daniel Bayliss, Daniel J. Stevens

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


We present near-infrared high-precision photometry for eight transiting hot Jupiters observed during their predicted secondary eclipses. Our observations were carried out using the staring mode of theWIRCam instrument on theCanada-France-Hawaii Telescope (CFHT).We present the observing strategies and data reduction methods which delivered time series photometry with statistical photometric precision as lowas 0.11 per cent. We performed aBayesian analysis to model the eclipse parameters and systematics simultaneously. The measured planet-tostar flux ratios allowed us to constrain the thermal emission from the day side of these hot Jupiters, as we derived the planet brightness temperatures. Our results combined with previously observed eclipses reveal an excess in the brightness temperatures relative to the blackbody prediction for the equilibrium temperatures of the planets for a wide range of heat redistribution factors. We find a trend that this excess appears to be larger for planets with lower equilibrium temperatures. This may imply some additional sources of radiation, such as reflected light from the host star and/or thermal emission from residual internal heat from the formation of the planet.

Original languageEnglish (US)
Pages (from-to)4264-4277
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
StatePublished - Mar 1 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.


  • Facility: CFHT
  • Infrared: planetary systems
  • Instrument: WIRCam
  • Instrumentation: photometers
  • Stars: planetary systems


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