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Link to original content: https://doi.org/10.32023/0001-5237/70.3.2
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| doi: 10.32023/0001-5237/70.3.2 | Vol. 70 (2020), No. 3 | pp. 181-202 |
Search for Planets in Hot Jupiter Systems with Multi-Sector TESS
Photometry. I. No Companions in Planetary Systems KELT-18, KELT-23,
KELT-24, Qatar-8, WASP-62, WASP-100, WASP-119, and WASP-126
G. Maciejewski
Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University,
Grudzi±dzka 5, 87-100 Toruñ, Poland
Received: September 22, 2020
ABSTRACT
Origins of giant planets on tight orbits, so called hot Jupiters, are
a long-lasting question in the planetary formation and evolution
theory. The answer seems to be hidden in architectures of those
systems that remain only partially understood. Using multi-sector
time-series photometry from the Transiting Exoplanet Survey
Satellite, we searched for additional planets in the KELT-18,
KELT-23, KELT-24, Qatar-8, WASP-62, WASP-100, WASP-119, and WASP-126
planetary systems using both the transit technique and transit
timing method. Our homogeneous analysis has eliminated the presence
of transiting companions down to the terrestrial-size regime in the
KELT-23 and WASP-62 systems, and down to mini-Neptunes or Neptunes
in the remaining ones. Transit timing analysis has revealed no sign
of either long-term trends or periodic perturbations for all the
studied hot Jupiters, including the WASP-126 b for which
deviations from a Keplerian model were claimed in the
literature. The loneliness of the planets of the sample speaks in
favor of the high-eccentricity migration mechanism that probably
brought them to their tight orbits observed nowadays. As a by-product
of our study, the transit light curve parameters were redetermined
with a substantial improvement of the precision for six systems. For
KELT-24 b, a joint analysis allowed us to place a tighter
constraint on its orbital eccentricity.
Key words:
Stars: individual: KELT-18, KELT-23, KELT-24, Qatar-8, WASP-62, WASP-100, WASP-119, WASP-126 - Planets
and satellites: individual: KELT-18 b, KELT-23 b, KELT-24 b, Qatar-8 b,
WASP-62 b, WASP-100 b, WASP-119 b, WASP-126 b
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