Precise Transit Photometry Using TESS: Updated Physical Properties for 28 Exoplanets Around Bright Stars

Abstract

The TESS follow-up of a large number of known transiting exoplanets provide unique opportunity to study their physical properties more precisely. Being a space-based telescope, the TESS observations are devoid of any noise component resulting from the interference of Earth's atmosphere. TESS also provides a better probability to observe subsequent transit events owing to its longer uninterrupted time-series observations compared to the ground-based telescopes. Especially, for the exoplanets around bright host-stars, TESS time-series observations provides high SNR lightcurves, which can be used for higher precision studies for these exoplanets. In this work, I have studied the TESS transit photometric follow-up observations of 28 exoplanets around bright stars with $V_{mag}\le$10. The already high SNR lightcurves from TESS have been further processed with a critical noise treatment algorithm, using the wavelet denoising and the Gaussian-process regression techniques, to effectively reduce the noise components both correlated and uncorrelated in time, which were then used to estimate the physical properties of these exoplanets. The study has resulted in very precise values for the physical properties of the target exoplanets, with the improvements in precision being significant for most of the cases compared to the previous studies. Also, since a comparatively large number of transit lightcurves from TESS observations were used to estimate these physical properties for each of the target exoplanets, which removes any bias due to the lack of sufficient datasets, these updated physical properties can be considered extremely accurate and reliable for future studies.

23 pages, 9 figures, 10 tables, Accepted for publication in The Astrophysical Journal Supplement Series

References in corpus (16)

• The Transiting Exoplanet Survey Satellite
• Accurate, Empirical Radii and Masses of Planets and their Host Stars with Gaia Parallaxes
• KELT-20b: A giant planet with a period of P~ 3.5 days transiting the V~ 7.6 early A star HD 185603
• Empirical limb-darkening coefficients & transit parameters of known exoplanets from TESS
• From dense hot Jupiter to low-density Neptune: The discovery of WASP-127b, WASP-136b and WASP-138b
• KELT-17b: A hot-Jupiter transiting an A-star in a misaligned orbit detected with Doppler tomography
• KELT-2Ab: A Hot Jupiter Transiting the Bright (V=8.77) Primary Star of a Binary System
• TESS unveils the phase curve of WASP-33b. Characterization of the planetary atmosphere and the pulsations from the star
• Precise photometric transit follow-up observations of five close-in exoplanets : update on their physical properties
• KELT-19Ab: A P~4.6 Day Hot Jupiter Transiting a Likely Am Star with a Distant Stellar Companion
• Improving transit characterisation with Gaussian process modelling of stellar variability
• Constraints on the Atmospheric Circulation and Variability of the Eccentric Hot Jupiter XO-3b
• Spectroscopic parameters for solar-type stars with moderate/high rotation. New parameters for 10 planet-hosts
• Multi-band transit follow up observations of five hot-Jupiters with critical noise treatments: Improved physical properties
• Rapidly rotating stars and their transiting planets: KELT-17b, KELT-19Ab, and KELT-21b in the CHEOPS and TESS era
• Tidal Distortions as a Bottleneck on Constraining Exoplanet Compositions

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• Precise Transit Photometry Using TESS II: Revisiting 28 Additional Transiting Systems With Updated Physical Properties
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• Evidence of Titanate Clouds in the Day-side Atmosphere of the Ultra-Hot Jupiter WASP-121b
• Magnetic field strengths of hot giant exoplanets consistent with Solar System values