New paper: a small planet in the temperate zone of K2-133 ?>

New paper: a small planet in the temperate zone of K2-133

A new paper by my PhD student Rob Wells is now accepted for publication:

Validation of a temperate fourth planet in the K2-133 multiplanet system“, Wells, R.; Poppenhaeger, K.; Watson, C. A.

Phase-folded light curve of the fourth planet in the K2-133 system, with best-fitting model (Wells et a. 2019).

Abstract: We present follow-up observations of the K2-133 multiplanet system. Previously, we announced that K2-133 contained three super-Earths orbiting an M1.5V host star – with tentative evidence of a fourth outer-planet orbiting at the edge of the temperate zone. Here, we report on the validation of the presence of the fourth planet, determining a radius of 1.73 R⊕. The four planets span the radius gap of the exoplanet population, meaning further follow-up would be worthwhile to obtain masses and test theories of the origin of the gap. In particular, the trend of increasing planetary radius with decreasing incident flux in the K2-133 system supports the claim that the gap is caused by photo-evaporation of exoplanet atmospheres. Finally, we note that K2-133 e orbits on the edge of the star’s temperate zone, and that our radius measurement allows for the possibility that this is a rocky world. Additional mass measurements are required to confirm or refute this scenario.

Monthly Notices of the Royal Astronomical Society, Volume 487, Issue 2, p.1865-1873, 2019.

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