Transit timing variations in WASP-10b induced by stellar activity
S. C. C. Barros, G. Boué, N. P. Gibson, D. Pollacco, A. Santerne, F. P. Keenan, I. Skillen, R. A. Street
Resumo
The hot-Jupiter WASP-10b was reported by Maciejewski et al. to show transit timing variations (TTVs) with an amplitude of ∼3.5 min. These authors proposed that the observed TTVs were caused by a 0.1MJup perturbing companion with an orbital period of ∼5.23 d, and hence, close to the outer 5:3 mean-motion resonance with WASP-10b. To test this scenario, we present eight new transit light curves of WASP-10b obtained with the Faulkes Telescope North and the Liverpool Telescope. The new light curves, together with 22 previously published ones, were modelled with a Markov Chain Monte Carlo transit fitting code. Transit depth differences reported for WASP-10b are thought to be due to starspot-induced brightness modulation of the host star. Assuming the star is brighter at the activity minimum, we favour a small planetary radius. We find
Palavras chave
techniques: photometric - time - stars: activity - stars: individual: WASP-10 - planetary systems - starspots
Monthly Notices of the Royal Astronomical Society
Volume 430, Página 3032
abril 2013
DOI: 10.1093/mnras/stt111
Código bibliográfico ADS: 2013MNRAS.430.3032B