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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

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posted on 2023-05-21, 07:20 authored by Guilluy, G, Gressier, A, Wright, S, Santerne, A, Jaziri, AY, Edwards, B, Changeat, Q, Modirrousta-Galian, D, Skaf, N, Al-Refaie, A, Baeyens, R, Bieger, MF, Blain, D, Kiefer, F, Morvan, M, Mugnai, LV, Pluriel, W, Poveda, M, Zingales, T, Whiteford, N, Yip, KH, Charnay, B, Leconte, J, Drossart, P, Sozzetti, A, Marcq, E, Tsiaras, A, Venot, O, Waldmann, I, Jean-Philippe BeaulieuJean-Philippe Beaulieu
We present an atmospheric characterization study of two medium-sized planets bracketing the radius of Neptune: HD 106315c (R P = 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 log10[NH3] = -4.3-2.0+0.7 (∼5.68σ) and log10[H2O] = -4.1-0.9+0.9 (∼3.17σ) for HD 106315c and HD 3167c, respectively. The transmission spectrum of HD 106315c also shows possible evidence of ammonia absorption (log10[NH3] = -4.3-2.0+0.7 ∼1.97σ, 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 (log10[CO2] = -2.4-1.0+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.

History

Publication title

Astronomical Journal

Volume

161

Article number

19

Number

19

Pagination

1-22

ISSN

0004-6256

Department/School

School of Natural Sciences

Publisher

Univ Chicago Press

Place of publication

1427 E 60Th St, Chicago, USA, Il, 60637-2954

Rights statement

© 2020. The American Astronomical Society

Repository Status

  • Open

Socio-economic Objectives

Expanding knowledge in the physical sciences

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