Exploring Synergies between Twinkle and Ariel: a Pilot Study

Twinkle and Ariel, set to launch in 2025 and 2029 respectively, will conduct the first large-scale homogeneous spectroscopic surveys of hundreds of exoplanet atmospheres. This will fully transition the field to an era of population-level atmospheric characterization. In this pilot study, we explore synergies between the two missions by focusing on a select subset of 'cool' planets well-suited for observation by both telescopes.

Using representative noise levels, we compute the number of visits needed, simulate and retrieve observed transmission spectra assuming gaseous, H2/He-dominated atmospheres. We will show that for all targets, atmospheric parameters are generally retrieved within 1-sigma of input values, with Ariel achieving tighter constraints. 

We will demonstrate exploitable synergies between Twinkle and Ariel for this 'cool' planet sample, with Twinkle potentially providing a vantage point to plan Ariel observations. As the missions' target lists take shape, we encourage further investigation by both consortium communities to fully map the synergy potential as the launch dates approach.