The Hubble PanCET program: Transit and Eclipse Spectroscopy of the Hot-Jupiter WASP-74b

Fu, Guangwei; Deming, Drake; May, Erin M.; Stevenson, Kevin B.; Sing, David K.; Lothringer, Joshua D.; Wakeford, Hannah R.; Nikolov, Nikolay; Evans, T. M.; Bourrier, V.; Santos, Leonardo A. Dos; Alam, Munazza K.; Henry, Gregory W.; Muñoz, A. García; López‐Morales, Mercedes

doi:10.3847/1538-3881/ac3008

Cited by 10 publications

(39 citation statements)

References 53 publications

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“…In a more recent study, Edwards et al (2020), we accounted for a faint stellar companion to WASP-76 b (Bohn et al 2020;Southworth et al 2020) and showed that the original transit spectrum was contaminated. A similar study was performed by Fu et al (2021). Once the contamination was removed, the transmission spectrum no longer showed substantial evidence for optical absorbers but retained its strong water feature.…”

Section: D20 Individual Analysis Of Wasp-74 Bmentioning

confidence: 76%

Five key exoplanet questions answered via the analysis of 25 hot Jupiter atmospheres in eclipse

Changeat,

Edwards,

Al-Refaie

et al. 2022

Preprint

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Population studies of exoplanets are key to unlocking their statistical properties. So far the inferred properties have been mostly limited to planetary, orbital and stellar parameters extracted from, e.g., Kepler, radial velocity, and GAIA data. More recently an increasing number of exoplanet atmospheres have been observed in detail from space and the ground. Generally, however, these atmospheric studies have focused on individual planets, with the exception of a couple of works which have detected the presence of water vapor and clouds in populations of gaseous planets via transmission spectroscopy. Here, using a suite of retrieval tools, we analyse spectroscopic and photometric data of 25 hot Jupiters, obtained with the Hubble and Spitzer Space Telescopes via the eclipse technique. By applying the tools uniformly across the entire set of 25 planets, we extract robust trends in the thermal structure and chemical properties of hot Jupiters not obtained in past studies. With the recent launch of JWST and the upcoming missions Twinkle, and Ariel, population based studies of exoplanet atmospheres, such as the one presented here, will be a key approach to understanding planet characteristics, formation, and evolution in our galaxy.

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Section: D20 Individual Analysis Of Wasp-74 Bmentioning

confidence: 76%

Five key exoplanet questions answered via the analysis of 25 hot Jupiter atmospheres in eclipse

Changeat,

Edwards,

Al-Refaie

et al. 2022

Preprint

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“…The third exposure of the last orbit was affected by a satellitecrossing event (see Fu et al 2021). We found no signs of its persistence impacting the remainder of the orbit, as in Fu et al (2021). We therefore simply discarded this exposure.…”

Section: Systematics Correctionmentioning

confidence: 89%

A strong H⁻ opacity signal in the near-infrared emission spectrum of the ultra-hot Jupiter KELT-9b

Jacobs

Désert

Pino

et al. 2022

A&A

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We present the analysis of a spectroscopic secondary eclipse of the hottest transiting exoplanet detected to date, KELT-9b, obtained with the Wide Field Camera 3 aboard the Hubble Space Telescope. We complement these data with literature information on stellar pulsations and Spitzer/Infrared Array Camera and Transiting Exoplanet Survey Satellite eclipse depths of this target to obtain a broadband thermal emission spectrum. Our extracted spectrum exhibits a clear turnoff at 1.4 μm. This points to H− bound-free opacities shaping the spectrum. To interpret the spectrum, we perform grid retrievals of self-consistent 1D equilibrium chemistry forward models, varying the composition and energy budget. The model with solar metallicity and C/O ratio provides a poor fit because the H− signal is stronger than expected, requiring an excess of electrons. This pushes our retrievals toward high atmospheric metallicities ([M/H] = 1.98−0.21+0.19) and a C/O ratio that is subsolar by 2.4σ. We question the viability of forming such a high-metallicity planet, and therefore provide other scenarios to increase the electron density in this atmosphere. We also look at an alternative model in which we quench TiO and VO. This fit results in an atmosphere with a slightly subsolar metallicity and subsolar C/O ratio ([M/H] = −0.22−0.13+0.17, log (C/O) = −0.34−0.34+0.19). However, the required TiO abundances are disputed by recent high-resolution measurements of the same planet.

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“…As a result, we have only observed featureless emission spectra among the hottest planets. In between the two regions (∼2200K to 2700K) we see a transitional parameter space where atmospheres can be inverted (Fu et al 2022;Evans et al 2017) or isothermal (Fu et al 2021b;Mansfield et al 2021). HAT-P-41b sits in the middle of this transitional space.…”

Section: Compared With Other Hot Jupiter Atmospheresmentioning

confidence: 97%

“…The presence of H-continuum opacity was inferred in multiple ultra-hot Jupiters (Arcangeli et al 2019;Fu et al 2021a). In the longer wavelength, the CO/CO 2 features were indicated by the deviations of Spitzer photometric points in 3.6 µm and 4.5 µm channels from the blackbody approximation (Garhart et al 2020;Fu et al 2021b).…”

Section: Introductionmentioning

confidence: 99%

The Hubble PanCET program: Emission spectrum of hot Jupiter HAT-P-41b

Fu,

Sing,

Deming

et al. 2022

Preprint

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We present the most complete emission spectrum for inflated hot Jupiter HAT-P-41b combining new HST WFC/G141 spectrum from the Hubble Panchromatic Comparative Exoplanet Treasury (PanCET) program with archival Spitzer eclipse observations. We found a near blackbody-like emission spectrum which is best fitted with an isothermal temperature-pressure (TP) profile that agrees well with the dayside heat redistribution scenario assuming zero Bond albedo. The non-inverted TP profile is consistent with the non-detection of NUV/optical absorbers in the transit spectra. We do not find any evidence for significant H − opacity nor a metal-rich atmosphere. HAT-P-41b is an ideal target that sits in the transitioning parameter space between hot and ultra-hot Jupiters, and future JWST observations will help us to better constrain the thermal structure and chemical composition.

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The Hubble PanCET program: Transit and Eclipse Spectroscopy of the Hot-Jupiter WASP-74b

Cited by 10 publications

References 53 publications

Five key exoplanet questions answered via the analysis of 25 hot Jupiter atmospheres in eclipse

Five key exoplanet questions answered via the analysis of 25 hot Jupiter atmospheres in eclipse

A strong H⁻ opacity signal in the near-infrared emission spectrum of the ultra-hot Jupiter KELT-9b

The Hubble PanCET program: Emission spectrum of hot Jupiter HAT-P-41b

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The Hubble PanCET program: Transit and Eclipse Spectroscopy of the Hot-Jupiter WASP-74b

Cited by 10 publications

References 53 publications

Five key exoplanet questions answered via the analysis of 25 hot Jupiter atmospheres in eclipse

Five key exoplanet questions answered via the analysis of 25 hot Jupiter atmospheres in eclipse

A strong H− opacity signal in the near-infrared emission spectrum of the ultra-hot Jupiter KELT-9b

The Hubble PanCET program: Emission spectrum of hot Jupiter HAT-P-41b

Contact Info

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A strong H⁻ opacity signal in the near-infrared emission spectrum of the ultra-hot Jupiter KELT-9b