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ARES IV: Probing the atmospheres of the two warm small planets HD 106315 c and HD 3167 c with the HST/WFC3 camera

Gloria Guilluy 1, 2 Amélie Gressier 3, 4, 5 Sam Wright 6 Alexandre Santerne 7 Adam Y. Jaziri 8 Billy Edwards 6 Quentin Changeat 6 Darius Modirrousta-Galian 9, 10 Nour Skaf 6, 5 Ahmed Al-Refaie 6 Robin Baeyens 11 Michelle Fabienne Bieger 12 Doriann Blain 5 Flavien Kiefer 4 Mario Morvan 6 Lorenzo V. Mugnai 13 William Pluriel 8 Mathilde Poveda 14, 15 Tiziano Tsingales 8 Niall Whiteford 16, 17 Kai Hou Yip 6 Benjamin Charnay 5 Jérémy Leconte 8 Pierre Drossart 5, 4 Alessandro Sozzetti 2 Emmanuel Marcq 3 Angelos Tsiaras 6 Olivia Venot 14 Ingo Waldmann 6 Jean-Philippe Beaulieu 18, 4
Abstract : We present an atmospheric characterization study of two medium sized planets bracketing the radius of Neptune: HD 106315 c (R$_{\rm{P}}$=4.98 $\pm$ 0.23 R$_{\oplus}$) and HD 3167 c (R$_{\rm{P}}$=2.740$_{-0.100}^{+0.106}$ R$_{\oplus}$). We analyse spatially scanned spectroscopic observations obtained with the G141 grism (1.125 - 1.650 $\mu$m) of the Wide Field Camera 3 (WFC3) onboard the Hubble Space Telescope. We use the publicly available Iraclis pipeline and TauREx3 atmospheric retrieval code and we detect water vapor in the atmosphere of both planets with an abundance of $\log_{10}[\mathrm{H_2O}]=-2.1^{+0.7}_{-1.3}$ ($\sim$5.68$\sigma$) and $\log_{10}[\mathrm{H_2O}]=-4.1^{+0.9}_{-0.9}$ ($\sim$3.17$\sigma$) for HD 106315 c and HD 3167 c, respectively. The transmission spectrum of HD 106315 c shows also a possible evidence of ammonia absorption ($\log_{10}[\mathrm {NH_3}]=-4.3^{+0.7}_{-2.0}$, $\sim$1.97$\sigma$ -even if it is not significant-), whilst carbon dioxide absorption features may be present in the atmosphere of HD 3167 c in the $\sim$1.1-1.6~$\mu$m wavelength range ($\log_{10}[\mathrm{CO_{2}}]= -2.4^{+0.7}_{-1.0}$, $\sim$3.28$\sigma$). However the CO$_2$ detection appears significant, it must be considered carefully and put into perspective. Indeed, CO$_2$ presence is not explained by 1D equilibrium chemistry models, and it could be due to possible systematics. The additional contribution of clouds, CO and CH$_4$ are discussed. HD 106315 c and HD 3167 c will be interesting targets for upcoming telescopes such as the James Webb Space Telescope (JWST) and the Atmospheric Remote-Sensing Infrared Exoplanet Large-Survey (Ariel).
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Gloria Guilluy, Amélie Gressier, Sam Wright, Alexandre Santerne, Adam Y. Jaziri, et al.. ARES IV: Probing the atmospheres of the two warm small planets HD 106315 c and HD 3167 c with the HST/WFC3 camera. The Astronomical Journal, American Astronomical Society, 2021, 161 (1), pp.19. ⟨10.3847/1538-3881/abc3c8⟩. ⟨hal-03014031⟩

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