Abstract

Simulation of phase-resolved spectroscopic observations of hot Jupiters with NIRISS

Geneviève Arboit (Université de Montréal and iREx)

David Lafrenière (Université de Montréal and iREx)
Loïc Albert (Université de Montréal and iREx)

We present a simulation of infrared spectroscopic observations of the phase curve of transiting exoplanets with NIRISS SOSS, in order to determine which systems are amenable to positive detection of phase modulation and which planet parameters can and cannot be constrained by the observations. We combine emission spectra, based on the BT-Settl models, modulated by the phase of a planet around its host star, as well as reflection spectra. Given our knowledge of NIRISS, photon and read noises are added to the resulting signal, as well as a priori unknown systematic variations of the overall instrument response with time. We assume that the planet is a tidally locked hot Jupiter with two temperatures, each characterizing one of its hemispheres. These modelled observations are then fitted to theoretical models to constrain the planet temperature. We present a simulation for WASP-43b and show that the temperatures of its hemispheres can be constrained to within 50 K.

Mode of presentation: poster