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
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.
- Publication:
-
Acta Astronomica
- Pub Date:
- September 2020
- DOI:
- 10.32023/0001-5237/70.3.2
- arXiv:
- arXiv:2010.11977
- Bibcode:
- 2020AcA....70..181M
- Keywords:
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- 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;
- Astrophysics - Earth and Planetary Astrophysics
- E-Print:
- Revised version, submitted to Acta Astronomica