Revisiting the secondary eclipses of KELT-1b using TESS observations

Eftekhar, Mohammad; Abedini, Yousefali

doi:10.1016/j.newast.2022.101837

Cited by 2 publications

(2 citation statements)

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“…The detection of secondary eclipse and characterization of the phase curve of WASP-121b (Bourrier et al 2020;Daylan et al 2021;Eftekhar 2022aEftekhar , 2022b, WASP-18 (Shporer et al 2019), KELT-1b (Beatty et al 2020;von Essen et al 2021;Eftekhar & Abedini 2022), and WASP-100b (Jansen & Kipping 2020), are of particular interest to this study. TESS has measured the phase curves of all of these ultrahot Jupiters, which have dayside temperatures of about ∼2200 K and are predicted to be tidally locked due to their close proximity to the host star.…”

Section: Introductionmentioning

confidence: 98%

TESS Unveils the Full Phase Curve of WASP-19b

Eftekhar¹,

Adibi²

2022

Planet. Sci. J.

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We present the detection and analysis of the full-orbit phase curve and secondary eclipse of the short-period transiting hot Jupiter system WASP-19b with a single joint fit to photometric data and resolve parameter degeneracy. We analyze data taken by the Transiting Exoplanet Survey Satellite (TESS) during sectors 9 and 36. We model the data with our five-component model: primary transit, secondary eclipse, ellipsoidal variations, thermal emission, and reflected light, which are jointly fit to extract the information from all parameters simultaneously. The amplitude of Doppler beaming was also estimated to be ∼3 parts-per-million (ppm), but given the precision of the photometric data, we found that it was negligible and excluded it from the total phase curve model. We confidently report the secondary eclipse depth of 494 − 48 + 59 ppm, the most accurate eclipse depth determined so far for WASP-19b, after cleaning the data from the instrumental systematic noise. According to the TESS bandpass, the day and nightside temperatures of WASP-19b are 2245 − 20 + 19 K and 1095 − 21 + 20 , respectively. In addition, we find that the region of maximum brightness is well aligned with the substellar point, implying that there is an inefficient heat distribution from the dayside to the nightside. Our derived A g = 0.11 − 0.03 + 0.03 , suggesting that WASP-19b’s geometric albedo is greater than the geometric albedos of most other hot Jupiters. Finally, the ellipsoidal variation signal amplitude we calculated agrees with theoretical expectations. Our comprehensive model with the approach of Markov Chain Monte Carlo shows the remedy of the degeneracy parameter in photometric data.

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Section: Introductionmentioning

confidence: 98%

TESS Unveils the Full Phase Curve of WASP-19b

Eftekhar¹,

Adibi²

2022

Planet. Sci. J.

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“…Several studies have measured the primary transit (when the planet passes in front of its host star) of the KELT-1b and the depth of its secondary eclipse (i.e., when the host star occults the planet's dayside hemisphere) [8][9][10][11] . The dayside and nightside temperatures of KELT-1b were measured to 3201 ± 147 K and 1484 ± 110 K, respectively, according to an analysis of the thermal emission 12 , this is to be expected, given the planet's vicinity to its host F-type star.…”

Section: Introductionmentioning

confidence: 99%

Full Orbital Phase Curve of KELT-1b using TESS observations

Eftekhar

2023

Preprint

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We present our joint model for comprehensive phase curve analysis of the transiting brown dwarf KELT-1b using observations from the Transiting Exoplanet Survey Satellite (TESS). We developed a full model of the phase curve over the orbit of a star-planet system, which includes primary transit, secondary eclipse, thermal emission, reflection, ellipsoidal tidal distortion, and Doppler beaming. All of these are jointly fitted simultaneously to obtain the parameters from the data sets. After taking out the instrumental systematic noise, we reliably detect the secondary eclipse with a depth of 383+36−24 ppm. Its hotspot is located east of the substellar point, demonstrating heat transport from the dayside (3005+207−191K) to the nightside (< 1491+162−145K) at the altitudes probed by TESS. Our estimated geometric albedo, Ag = 0.47+0.06−0.04, suggests that KELT-1b has a high geometric albedo. Finally, our estimated amplitude of the ellipsoidal variation and Doppler beaming signal is in agreement with the predictions of the theoretical expectations.

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Revisiting the secondary eclipses of KELT-1b using TESS observations

Cited by 2 publications

References 30 publications

TESS Unveils the Full Phase Curve of WASP-19b

TESS Unveils the Full Phase Curve of WASP-19b

Full Orbital Phase Curve of KELT-1b using TESS observations

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