Homogeneous transit timing analyses of 10 exoplanet systems
Author(s)
Date
2022-03-07Source Title
Monthly Notices of the Royal Astronomical Society
Print ISSN
0035-8711
Electronic ISSN
1365-2966
Publisher
Oxford University Press
Volume
512
Issue
2
Pages
2062 - 2081
Language
English
Type
ArticleItem Usage Stats
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Abstract
We study the transit timings of 10 exoplanets in order to investigate potential transit timing variations in them. We model their
available ground-based light curves, some presented here and others taken from the literature, and homogeneously measure
the mid-transit times. We statistically compare our results with published values and find that the measurement errors agree.
However, in terms of recovering the possible frequencies, homogeneous sets can be found to be more useful, of which no
statistically relevant example has been found for the planets in our study. We corrected the ephemeris information of all 10
planets we studied and provide these most precise light elements as references for future transit observations with space-borne
and ground-based instruments. We found no evidence for secular or periodic changes in the orbital periods of the planets in our
sample, including the ultra-short period WASP-103 b, whose orbit is expected to decay on an observable time-scale. Therefore,
we derive the lower limits for the reduced tidal quality factors (Q) for the host stars based on best-fitting quadratic functions to
their timing data. We also present a global model of all available data for WASP-74 b, which has a Gaia parallax-based distance
value ∼25 per cent larger than the published value.
Keywords
Geometrical opticsOrbits
Stars
Timing circuits
Hat-P-32
Hat-P-37
Hat-P-56
Methods
Observational
Planetary systems
Individual
Hat-p-23
Techniques
Photometric
Wasp-103
Wasp-14
Wasp-2
Wasp-37
Wasp-69
Wasp-74