Physical properties and transmission spectrum of the WASP-80 planetary system from multi-colour photometry

L. Mancini*, J. Southworth, S. Ciceri, Martin Dominik, Th. Henning, U. G. Jorgensen, A. F. Lanza, M. Rabus, C. Snodgrass, C. Vilela, Khalid Abdulla T Alsubai, V. Bozza, Daniel Martyn Bramich, S. Calchi Novati, G. D'Ago, Roberto Jose Figuera Jaimes, Pasquale Grant, S. -H. Gu, K. Harpsoe, T. HinseMarkus Peter Gerhard Hundertmark, D. Juncher, Noé Kains, H. Korhonen, A. Popovas, S. Rahvar, J. Skottfelt, R. Street, J. Surdej, Yiannis Tsapras, X. -B. Wang, O. Wertz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

WASP-80 is one of only two systems known to contain a hot Jupiter which transits its M-dwarf host star. We present eight light curves of one transit event, obtained simultaneously using two defocussed telescopes. These data were taken through the Bessell I, Sloan g' r' i' z' and near-infrared JHK passbands. We use our data to search for opacity-induced changes in the planetary radius, but find that all values agree with each other. Our data are therefore consistent with a flat transmission spectrum to within the observational uncertainties. We also measure an activity index of the host star of log R-HK' = -4.495, meaning that WASP-80A shows strong chromospheric activity. The non-detection of starspots implies that, if they exist, they must be small and symmetrically distributed on the stellar surface. We model all available optical transit light curves and obtain improved physical properties and orbital ephemerides for the system.

Original languageEnglish
Article numberA126
Number of pages9
JournalAstronomy & Astrophysics
Volume562
DOIs
Publication statusPublished - Feb 2014

Keywords

  • Planetary systems
  • Stars: fundamental parameters
  • Stars: individual: WASP-80
  • Techniques: photometric
  • Transiting extrasolar planets
  • Earth GJ 1214B
  • Stellar evolution database
  • Hubble-space-telescope
  • Hot Jupiters
  • Tidal-evolution
  • Cool stars
  • Atmosphere
  • Models
  • Mass

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