Gravity darkening and tidally perturbed stellar pulsation in the misaligned exoplanet system WASP-33

Kálmán, Sz.; Derekas, A. Bókon. A.; Szabó, Gy. M.; Hegedűs, V.; Nagy, K.

doi:10.1051/0004-6361/202243299

Cited by 8 publications

(1 citation statement)

References 33 publications

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“…Borsa et al (2021b) found that the pretransit absorption features did not cancel out like other pulsations when averaging different transits and suggested that they could be a stellar pulsation mode excited by the planet. The evidence of tidally perturbed stellar pulsation modes has also been found in the light curve of WASP-33 observed by the Transiting Exoplanet Survey Satellite, which were attributed to the misalignment of the stellar rotational axis and the planetary orbit (Kálmán et al 2022).…”

Section: Parametermentioning

confidence: 61%

High-resolution Transmission Spectroscopy of Ultrahot Jupiter WASP–33b with NEID

Yang 杨,

Chen 陈,

Wang

et al. 2023

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We report an attempt to detect molecular and atomic species in the atmosphere of the ultrahot Jupiter WASP-33b using the high-resolution echelle spectrograph NEID with a wavelength coverage of 380–930 nm. By analyzing the transmission spectrum of WASP-33b using the line-by-line technique and the cross-correlation technique, we confirm previous detection of Hα, Hβ, Hγ, and Ca ii infrared triplets. We find no evidence for a significant day-to-night wind in WASP-33b, taking into account the effects of stellar pulsations using a relatively novel Gaussian process method and poorly constrained systemic velocity measurements. We also detect the previously reported pretransit absorption signal, which may be a pulsation mode induced by the planet. Combined with previous CARMENES and HARPS-N observations, we report the nondetection of TiO, Ti i, and V i in the transmission spectrum, while they were already detected in the dayside atmosphere of WASP-33b. This implies a difference in the chemical compositions and abundances between the dayside and terminator atmospheres of WASP-33b and certainly requires further improvements in the sensitivity of the detection methods.

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Section: Parametermentioning

confidence: 61%

High-resolution Transmission Spectroscopy of Ultrahot Jupiter WASP–33b with NEID

Yang 杨,

Chen 陈,

Wang

et al. 2023

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The coevolution of migrating planets and their pulsating stars through episodic resonance locking

Bryan,

de Wit,

Sun

et al. 2024

Nat Astron

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Discovery of a substellar companion in the TESS light curve of the δ Scuti/γ Doradus hybrid pulsator HD 31221

Kálmán,

Derekas,

Csizmadia

et al. 2023

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Context. Close-in, sub-stellar companions to δ Scuti type stars present a highly suitable testbed for examining how planetary-mass objects can influence stellar pulsations. Aims. We aim to constrain the mass of HD 31221 b, probe its atmosphere, and demonstrate how it affects the pulsational pattern of its host, HD 31221. Methods. We made use of the available data from the short-cadence Transiting Exoplanet Survey Satellite (TESS). We modeled the nine observed transits and the out-of-phase variations, including Doppler beaming, ellipsoidal variations, and the reflection effect. We also incorporated ground-based photometry from the MuSCAT2 imager installed at the 1.52 m Telescopio Carlos Sanchez in the Teide Observatory, Spain, as well as speckle interferometry from the Southern Astrophysical Research telescope. Results. We found HD 31221 b to have an orbital period of 4.66631 ± 0.00011 days, with a radius of 1.32 ± 0.14 RJ and a mass of 11.5 ± 10.3 MJ (from the ellipsoidal effect), making it consistent with either a brown dwarf or a giant planet. As HD 31221 is a rapid rotator (v sin I⋆ = 175.31 ± 1.74 km s−1), we deduced the spin-orbit misalignment to be λ = −121.6 ± 14.4° and I⋆ = 55.9 ± 11.3°. The phase curve is dominated by the reflection effect, with a geometric albedo of 1.58 ± 0.50. We also found evidence that HD 31221 is a δ Scuti/γ Doradus hybrid pulsator. There are three cases for which the 3rd, 85th, and 221st orbital harmonics almost exactly coincide with peaks in the Fourier spectrum of the star, hinting at tidally perturbed stellar oscillations. Conclusions. HD 31221 b is the third substellar object that is found to be disrupting the pulsations of its host, following HAT-P-2 and WASP-33. Additional photometric observations by CHEOPS and/or PLATO can be used to further constrain its mass and provide a more in-depth analysis of its atmosphere.

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Gravity darkening and tidally perturbed stellar pulsation in the misaligned exoplanet system WASP-33

Cited by 8 publications

References 33 publications

High-resolution Transmission Spectroscopy of Ultrahot Jupiter WASP–33b with NEID

High-resolution Transmission Spectroscopy of Ultrahot Jupiter WASP–33b with NEID

The coevolution of migrating planets and their pulsating stars through episodic resonance locking

Discovery of a substellar companion in the TESS light curve of the δ Scuti/γ Doradus hybrid pulsator HD 31221

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