WASP-4 transit timing variation from a comprehensive set of 129 transits
| Autor: | Roman V. Baluev, Sergio Hoyer, José A. R. S. da Silva, V. Sh. Shaidulin, E. N. Sokov, I. A. Sokova, Phil Evans, Catherine M. Huitson, C. R. Knight |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Earth and Planetary Astrophysics (astro-ph.EP) Transit-timing variation 010308 nuclear & particles physics FOS: Physical sciences Astronomy and Astrophysics Astrophysics Planetary system Light curve 01 natural sciences symbols.namesake Space and Planetary Science 0103 physical sciences Hot Jupiter symbols Range (statistics) Transit (astronomy) Variation (astronomy) Astrophysics - Instrumentation and Methods for Astrophysics 010303 astronomy & astrophysics Doppler effect Instrumentation and Methods for Astrophysics (astro-ph.IM) Astrophysics - Earth and Planetary Astrophysics |
| Popis: | We homogeneously reanalyse $124$ transit light curves for the WASP-4 b hot Jupiter. This set involved new observations secured in 2019 and nearly all observations mentioned in the literature, including high-accuracy GEMINI/GMOS transmission spectroscopy of 2011-2014 and TESS observations of 2018. The analysis confirmed a nonlinear TTV trend with $P/|\dot P|\sim (17-30)$ Myr (1-sigma range), implying only half of the initial decay rate estimation. The trend significance is at least $3.4$-sigma in the agressively conservative treatment. Possible radial acceleration due to unseen companions is not revealed in Doppler data covering seven years 2007-2014, and radial acceleration of $-15$ m s$^{-1}$yr$^{-1}$ reported in a recent preprint by another team is not confirmed. If present, it is a very nonlinear RV variation. Assuming that the entire TTV is tidal in nature, the tidal quality factor $Q_\star'\sim (4.5-8.5)\cdot 10^4$ does not reveal a convincing disagreement with available theory predictions. Accepted to MNRAS Letters. 5 pages, 1 figure. TTV data files and an online-only PDF supplement are in the download archive |
| Databáze: | OpenAIRE |
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