Exoplanet spectroscopy and photometry with the Twinkle space telescope

Edwards, Billy; Rice, Malena; Zingalès, Tiziano; Tessenyi, Marcell; Waldmann, I. P.; Tinetti, Giovanna; Pascale, Enzo; Savini, G.; Sarkar, Subhajit

doi:10.1007/s10686-018-9611-4

Cited by 77 publications

(62 citation statements)

References 72 publications

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“…6), which would therefore not be observable by either JWST or ARIEL. The Twinkle space telescope, however, which is due for launch in early 2022, has two spectrometers (visible, 0.4-1 µm, and infrared, 1.3-4.5 µm) (Edwards et al 2019), and so should be able to observe this feature. The Hubble STIS instrument is currently available, with an observational wavelength region which also covers that of the strong AlO absorption feature.…”

Section: Spitzer and Other Observational Datamentioning

confidence: 99%

Aluminium oxide in the atmosphere of hot Jupiter WASP-43b

Chubb

Min

Kawashima

et al. 2020

A&A

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We have conducted a re-analysis of publicly available Hubble Space Telescope Wide Field Camera 3 (HST WFC3) transmission data for the hot-Jupiter exoplanet WASP-43b, using the Bayesian retrieval package Tau-REx. We report evidence of AlO in transmission to a high level of statistical significance (>5σ in comparison to a flat model, and 3.4σ in comparison to a model with H2O only). We find no evidence of the presence of CO, CO2, or CH4 based on the available HST WFC3 data or on Spitzer IRAC data. We demonstrate that AlO is the molecule that fits the data to the highest level of confidence out of all molecules for which high-temperature opacity data currently exists in the infrared region covered by the HST WFC3 instrument, and that the subsequent inclusion of Spitzer IRAC data points in our retrieval further supports the presence of AlO. H2O is the only other molecule we find to be statistically significant in this region. AlO is not expected from the equilibrium chemistry at the temperatures and pressures of the atmospheric layer that is being probed by the observed data. Its presence therefore implies direct evidence of some disequilibrium processes with links to atmospheric dynamics. Implications for future study using instruments such as the James Webb Space Telescope are discussed, along with future opacity needs. Comparisons are made with previous studies into WASP-43b.

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Section: Spitzer and Other Observational Datamentioning

confidence: 99%

Aluminium oxide in the atmosphere of hot Jupiter WASP-43b

Chubb

Min

Kawashima

et al. 2020

A&A

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“…Additionally, future space telescopes JWST (Greene et al 2016), Twinkle (Edwards et al 2018), and ARIEL (Tinetti et al 2018) will provide a far wider wavelength range and these missions will definitively move the exoplanet field from an era Figure 8. Posterior distributions for atmospheric retrievals of KELT-7 b with various data sets.…”

Section: Future Characterizationmentioning

confidence: 99%

ARES. III. Unveiling the Two Faces of KELT-7 b with HST WFC3*

Pluriel

Whiteford

Edwards

et al. 2020

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We present the analysis of the hot-Jupiter KELT-7 b using transmission and emission spectroscopy from the Hubble Space Telescope, both taken with the Wide Field Camera 3. Our study uncovers a rich transmission spectrum that is consistent with a cloud-free atmosphere and suggests the presence of H 2 O and H −. In contrast, the extracted emission spectrum does not contain strong absorption features and, although it is not consistent with a simple blackbody, it can be explained by a varying temperature-pressure profile, collision induced absorption, and H −. KELT-7 b had also been studied with other space-based instruments and we explore the effects of introducing these additional data sets. Further observations with Hubble, or the next generation of space-based telescopes, are needed to allow for the optical opacity source in transmission to be confirmed and for molecular features to be disentangled in emission. Unified Astronomy Thesaurus concepts: Transmission spectroscopy (2133); Exoplanet atmospheres (487); Astronomy data analysis (1858)

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“…This, however, means that our phase-curve model can only be applied to planets that are compatible with this geometry: the planets must be tidally locked or in spin-synchronous orbits, for which the regions can be approximated by homogeneous temperature and chemical structure and/or for which the available data is not detailed enough to support a more granular model. In our model we only resolve three regions, in some cases for the next generation of space telescopes such as ESA-Ariel (Tinetti et al 2018), NASA-James Webb Space Telescope (Bean et al 2018) or Twinkle (Edwards et al 2018) it may be necessary to push to more detailed schemes with more than three regions or to a continuous description of the geometry. Thanks to a recent rework, the new architecture of TauREx 3 is now very flexible and easily modifiable, which means that the work presented in this paper could be rapidly extended.…”

Section: Limitations Of the Modelmentioning

confidence: 99%

TauREx3 PhaseCurve: A 1.5D Model for Phase-curve Description

Changeat

Al-Refaie

2020

ApJ

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In recent years, retrieval analysis of exoplanet atmospheres have been very successful, providing deep insights on the composition and the temperature structure of these worlds via transit and eclipse methods. Analysis of spectral phase-curve observations, which in theory provide even more information, are still limited to a few planets. In the next decade, new facilities such as NASA-James Webb Space Telescope and ESA-Ariel will revolutionize the field of exoplanet atmospheres and we expect that a significant time will be spent on spectral phase-curve observations. Most current models are still limited in their analysis of phase-curve data as they do not consider the planet atmosphere as a whole or they require large computational resources. In this paper we present a semi-analytical model that will allow computing exoplanet emission spectra at different phase angles. Our model provides a way to simulate a large number of observations while being only about four times slower than the traditional forward model for plane-parallel primary eclipse. This model, which is based on the newly developed TauREx 3 framework, will be further developed to allow for phase-curve atmospheric retrievals.

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Exoplanet spectroscopy and photometry with the Twinkle space telescope

Cited by 77 publications

References 72 publications

Aluminium oxide in the atmosphere of hot Jupiter WASP-43b

Aluminium oxide in the atmosphere of hot Jupiter WASP-43b

ARES. III. Unveiling the Two Faces of KELT-7 b with HST WFC3*

TauREx3 PhaseCurve: A 1.5D Model for Phase-curve Description

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