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ARES IV: Probing the Atmospheres of the Two Warm Small Planets HD 106315c and HD 3167c with the HST/WFC3 Camera

Guilluy, G; Gressier, A; Wright, S; Santerne, A; Jaziri, AY; Edwards, B; Changeat, Q; ... Beaulieu, J-P; + view all (2021) ARES IV: Probing the Atmospheres of the Two Warm Small Planets HD 106315c and HD 3167c with the HST/WFC3 Camera. The Astronomical Journal , 161 (1) , Article 19. 10.3847/1538-3881/abc3c8. Green open access

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Abstract

We present an atmospheric characterization study of two medium-sized planets bracketing the radius of Neptune: HD 106315c (RP = 4.98 ± 0.23 R⊕) and HD 3167c ( = - + RP 2.740 0.100 0.106 R⊕). We analyze spatially scanned spectroscopic observations obtained with the G141 grism (1.125–1.650 μm) of the Wide Field Camera 3 (WFC3) on board the Hubble Space Telescope. We use the publicly available Iraclis pipeline and TauREx3 atmospheric retrieval code and detect water vapor in the atmosphere of both planets, with an abundance of = - - + log H O 2.1 10 2 1.3 0.7 [ ] (∼5.68σ) and = - - + log H O 4.1 10 2 0.9 0.9 [ ] (∼3.17σ) for HD 106315c and HD 3167c, respectively. The transmission spectrum of HD 106315c also shows possible evidence of ammonia absorption ( =- ~ - s + log NH 4.3 , 1.97 10 3 2.0 0.7 [ ] , even if it is not significant), while carbon dioxide absorption features may be present in the atmosphere of HD 3167c in the ∼1.1–1.6 μm wavelength range ( = - - + log CO 2.4 10 2 1.0 0.7 [ ] , ∼3.28σ). However, the CO2 detection appears significant, and it must be considered carefully and put into perspective. Indeed, CO2 presence is not explained by 1D equilibrium chemistry models, and it could be due to possible systematics. The additional contributions of clouds, CO, and CH4 are discussed. HD 106315c and HD 3167c will be interesting targets for upcoming telescopes such as the James Webb Space Telescope and the Atmospheric Remote-sensing Infrared Exoplanet Large-survey

Type: Article
Title: ARES IV: Probing the Atmospheres of the Two Warm Small Planets HD 106315c and HD 3167c with the HST/WFC3 Camera
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/1538-3881/abc3c8
Publisher version: https://doi.org/10.3847/1538-3881/abc3c8
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Astronomy data analysis; Exoplanets; Exoplanet atmospheres; Hubble Space Telescope
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10117762
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