KELT-11 b: Abundances of water and constraints on carbon-bearing molecules from the Hubble transmission spectrum

Changeat, Quentin; Edwards, Billy; Al-Refaie, Ahmed F.; Morvan, Mario; Tsiaras, Angelos; Waldmann, Ingo P.; Tinetti, Giovanna

doi:10.48550/arxiv.2010.01310

Cited by 1 publication

(1 citation statement)

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“…We note that the compatibility of different datasets is hard to confirm, particularly without spectral overlap, as the use of different limb darkening coefficients or orbital parameters, imperfect correction of instrument systematics, or stellar activity and stellar variability can all cause variations in the transit depth ob- served (e.g. Tsiaras et al 2018;Alexoudi et al 2018;Yip et al 2020b,a;Changeat et al 2020;Pluriel et al 2020). Diamond-Lowe et al (2020) used the same orbital parameters, from Ment et al (2019), but used logarithmic limb darkening coefficients.…”

Section: Stellar Contaminationmentioning

confidence: 96%

Hubble WFC3 Spectroscopy of the Habitable-zone Super-Earth LHS 1140 b

Edwards,

Changeat,

Mori

et al. 2020

Preprint

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Atmospheric characterisation of temperate, rocky planets is the holy grail of exoplanet studies. These worlds are at the limits of our capabilities with current instrumentation in transmission spectroscopy and challenge our state-of-the-art statistical techniques. Here we present the transmission spectrum of the temperate Super-Earth LHS 1140b using the Hubble Space Telescope (HST). The Wide Field Camera 3 (WFC3) G141 grism data of this habitable zone (T eq = 235 K) Super-Earth (R = 1.7 R ⊕ ), shows tentative evidence of water. However, the signal-to-noise ratio, and thus the significance of the detection, is low and stellar contamination models can cause modulation over the spectral band probed. We attempt to correct for contamination using these models and find that, while many still lead to evidence for water, some could provide reasonable fits to the data without the need for molecular absorption although most of these also cause features in the visible ground-based data which are nonphysical. Future observations with the James Webb Space Telescope (JWST) would be capable of confirming, or refuting, this atmospheric detection.

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