TESS Timings of 31 Hot Jupiters with Ephemeris Uncertainties

Shan, Su-Su; Yang, Fan; Lu, Youjun; Wei, Xing; Wu, Tian; Zhang, Haiyan; Guo, Rui; Cui, Xiaohong; Yang, A. Y.; Zhang, Bo; Liu, Jifeng

doi:10.48550/arxiv.2111.06678

Cited by 7 publications

(16 citation statements)

References 51 publications

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“…After this work was nearly complete, we became aware of two other groups, Kokori et al (2021a) and Shan et al (2021), who have also been performing transit timing en masse. Since these works are not yet published, we refrained from a detailed comparison between our numerical results and theirs, but we can make some general comparisons.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…This team did not utilize TESS data in their study. Shan et al (2021) identified 31 hot Jupiters for which an ephemeris taken from the literature failed to predict the TESS transit times to within the statistical uncertainty. This is different from our approach, which was based on analyzing all available transit times whenever possible, rather than relying on a previously reported ephemeris.…”

Section: Summary and Discussionmentioning

confidence: 99%

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TESS Transit Timing of Hundreds of Hot Jupiters

Ivshina,

Winn

2022

Preprint

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We provide a database of transit times and updated ephemerides for 382 planets based on data from the NASA Transiting Exoplanet Survey Satellite (TESS) and previously reported transit times which were scraped from the literature in a semi-automated fashion. In total, our database contains 8,667 transit timing measurements for 382 systems. About 240 planets in the catalog are hot Jupiters (i.e. planets with mass >0.3 M Jup and period <10 days) that have been observed by TESS. The new ephemerides are useful for scheduling follow-up observations and searching for long-term period changes. WASP-12 remains the only system for which a period change is securely detected. We remark on other cases of interest, such as a few systems with suggestive (but not yet convincing) evidence for period changes, and the detection of a second transiting planet in the NGTS-11 system. The compilation of light curves, transit times, ephemerides, and timing residuals are made available online, along with the Python code that generated them (visit https://transit-timing.github.io).

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Section: Summary and Discussionmentioning

confidence: 99%

Section: Summary and Discussionmentioning

confidence: 99%

TESS Transit Timing of Hundreds of Hot Jupiters

Ivshina,

Winn

2022

Preprint

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“…The observed TTV signal and its interpretation are highly dependent on the data quality of timing observation. Any unexpected factors in deriving the transit timing parameters may change the period derivative (detailed example in Yang & Chary, 2021, submitted;Shan et al, 2021), and thus leads to different explanations. Therefore, longbaseline transit monitoring with high precision is crucial for enhancing understanding of the tidal dissipation process.…”

Section: Discussionmentioning

confidence: 99%

“…XO-3b is an another hot Jupiter with significant TTVs (Shan et al, 2021;Yang & Wei, 2021). The planetstar system has an orbit period (P orb ) of 3.19 days, an a of 4.95±0.18, an inclination of 84.20±0.54, and an e of 0.27587 +0.00071 −0.00067 (Winn et al, 2008;Bonomo et al, 2017;Stassun et al, 2017).…”

Section: Sitian Data For Transit Timing Analysis and Simulated Transi...mentioning

confidence: 99%

“…Tidal migration is one of mechanisms that may explain why hot Jupiters occur at such close orbits, though direct observational evidence of orbit decay is only achieved for a single planet, namely WASP-12b, in the past decades (Patra et al, 2017;Dawson & Johnson, 2018;Turner et al, 2021). The first data release of Transiting Exoplanet Survey Satellite (TESS; Ricker et al, 2015) in 2018, leads to the identification of four new candidates through TTV detection (Dong et al, 2021; Davoudi 1 wangw@nao.cas.cn 2 xingwei@bnu.edu.cn 3 huizhang@nju.edu.cn Shan et al, 2021;Yang & Chary, 2021, submitted;Yang & Wei, 2021). TTV monitoring depends on the timing precision and baseline length which are key technical specifications for time-domain facilities, e.g., Zwicky Transient Facility (ZTF; Bellm et al, 2019), Large Synoptic Survey Telescope (LSST; Ivezić et al, 2019), Tsinghua University-Ma Huateng Telescopes for Survey (TMTS; Zhang et al, 2020;Lin et al, 2021), Antarctic Survey Telescopes times 3 (AST3; Ma et al, 2018;Zhang et al, 2019), and SiTian (Liu et al, 2021;.…”

Section: Introductionmentioning

confidence: 99%

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Detecting and Monitoring Tidal Dissipation of Hot Jupiters in the Era of SiTian

Yang,

Wang,

Wei

et al. 2022

Preprint

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Transit Timing Variation (TTV) of hot Jupiters provides direct observational evidence of planet tidal dissipation. Detecting tidal dissipation through TTV needs high precision transit timings and long timing baselines. In this work, we predict and discuss the potential scientific contribution of SiTian Survey in detecting and analyzing exoplanet TTV. We develop a tidal dissipation detection pipeline for SiTian Survey that aims at time-domain astronomy with 72 1-meter optical telescopes. The pipeline includes the modules of light curve deblending, transit timing obtaining, and TTV modeling. SiTian is capable to detect more than 25,000 exoplanets among which we expect ∼50 sources showing evidence of tidal dissipation. We present detection and analysis of tidal dissipating targets, based on simulated SiTian light curves of XO-3b and WASP-161b. The transit light curve modeling gives consistent results within 1σ to input values of simulated light curves. Also, the parameter uncertainties predicted by Monte-Carlo Markov Chain are consistent with the distribution obtained from simulating and modeling the light curve 1000 times. The timing precision of SiTian observations is ∼ 0.5 minutes with one transit visit. We show that differences between TTV origins, e.g., tidal dissipation, apsidal precession, multiple planets, would be significant, considering the timing precision and baseline. The detection rate of tidal dissipating hot Jupiters would answer a crucial question of whether the planet migrates at an early formation stage or random stages due to perturbations, e.g., planet scattering, secular interaction. SiTian identified targets would be constructive given that the sample would extend tenfold.

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Detecting and Monitoring Tidal Dissipation of Hot Jupiters in the Era of SiTian

Yang¹,

Wang²,

Wei³

et al. 2022

Res. Astron. Astrophys.

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Transit Timing Variation (TTV) of hot Jupiters provides direct observational evidence of planet tidal dissipation. Detecting tidal dissipation through TTV needs high precision transit timings and long timing baselines. \textbf{In this work, we predict and discuss the potential scientific contribution of SiTian Survey in detecting and analyzing exoplanet TTV.} We develop a tidal dissipation detection pipeline for SiTian Survey that aims at time-domain astronomy with 72 1-meter optical telescopes. The pipeline includes the modules of light curve deblending, transit timing obtaining, and TTV modeling. SiTian is capable to detect more than 25,000 exoplanets among which we expect $\sim$50 sources showing evidence of tidal dissipation. We present detection and analysis of tidal dissipating targets, based on simulated SiTian light curves of XO-3b and WASP-161b. The transit light curve modeling gives consistent results within 1$\sigma$ to input values of simulated light curves. Also, the parameter uncertainties predicted by Monte-Carlo Markov Chain are consistent with the distribution obtained from simulating and modeling the light curve 1000 times. The timing precision of SiTian observations is $\sim$ 0.5 minutes with one transit visit. We show that differences between TTV origins, e.g., tidal dissipation, apsidal precession, multiple planets, would be significant, considering the timing precision and baseline. The detection rate of tidal dissipating hot Jupiters would answer a crucial question of whether the planet migrates at an early formation stage or random stages due to perturbations, e.g., planet scattering, secular interaction. SiTian identified targets would be constructive given that the sample would extend tenfold.

show abstract

TESS Timings of 31 Hot Jupiters with Ephemeris Uncertainties

Cited by 7 publications

References 51 publications

TESS Transit Timing of Hundreds of Hot Jupiters

TESS Transit Timing of Hundreds of Hot Jupiters

Detecting and Monitoring Tidal Dissipation of Hot Jupiters in the Era of SiTian

Detecting and Monitoring Tidal Dissipation of Hot Jupiters in the Era of SiTian

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