Kepler’s Dark Worlds: a Low Albedo for an Ensemble of Neptunian and Terran Exoplanets

Tiffany Jansen, David Kipping
(Submitted on 27 Oct 2017)

Photometric phase curves provide an important window onto exoplanetary atmospheres and potentially even their surfaces.

With similar amplitudes to occultations but far longer baselines, they have a higher sensitivity to planetary photons at the expense of a more challenging data reduction in terms of long-term stability.

In this work, we introduce a novel non-parametric algorithm dubbed “phasma” to produce clean, robust exoplanet phase curves and apply it to 115 Neptunian and 50 Terran exoplanets observed by Kepler. We stack the signals to further improve signal-to-noise, and measure an average Neptunian albedo of Ag < 0.23 to 95% confidence, indicating a lack of bright clouds consistent with theoretical models. Our Terran sample provides the first constraint on the ensemble albedo of exoplanets which are most likely solid, constraining Ag < 0.42 to 95% confidence. In agreement with our constraint on the greenhouse effect, our work implies that Kepler's solid planets are unlikely to resemble cloudy Venusian analogs, but rather dark Mercurian rocks. Comments:    Submitted to MNRAS, in the style of AAS. Phase curves and phasma code available at this https URL and forward model available at this https URL Subjects:    Earth and Planetary Astrophysics (astro-ph.EP)
Cite as:    arXiv:1710.10213 [astro-ph.EP] (or arXiv:1710.10213v1 [astro-ph.EP] for this version)
Submission history
From: Tiffany Jansen
[v1] Fri, 27 Oct 2017 15:56:43 GMT (12871kb,D)
https://arxiv.org/abs/1710.10213