Abstract
ABSTRACT We set out to look at the overlap between CHaracterizing ExOPlanets Satellite (CHEOPS) sky coverage and Transiting Exoplanet Survey Satellite (TESS) primary mission monotransits to determine what fraction of TESS monotransits may be observed by CHEOPS. We carry out a simulation of TESS transits based on the stellar population in TICv8 in the primary TESS mission. We then select the monotransiting candidates and determine their CHEOPS observing potential. We find that TESS will discover approximately 433 monotransits during its primary mission. Using a baseline observing efficiency of 40 per cent, we then find that 387 of these (∼89 per cent) will be observable by CHEOPS with an average observing time of ∼60 d yr−1. Based on the individual observing times and orbital periods of each system, we predict that CHEOPS could observe additional transits for approximately 302 of the 433 TESS primary mission monotransits (∼70 per cent). Given that CHEOPS will require some estimate of period before observing a target, we estimate that up to 250 (∼58 per cent) TESS primary mission monotransits could have solved periods prior to CHEOPS observations using a combination of photometry and spectroscopy.
Highlights
The CHaracterising ExOPlanets Satellite (CHEOPS, Broeg et al 2013; Fortier et al 2014) is an ESA mission dedicated to performing ultra-high precision photometry on known transiting planetary systems
Given that CHEOPS will require some estimate of period before observing a target we estimate that up to 250 (∼ 58%) TESS primary mission monotransits could have solved periods prior to CHEOPS observations using a combination of photometry and spectroscopy
We have shown that TESS will discover approximately 433 monotransits during its primary mission, including south and north ecliptic hemispheres
Summary
The CHaracterising ExOPlanets Satellite (CHEOPS, Broeg et al 2013; Fortier et al 2014) is an ESA mission dedicated to performing ultra-high precision photometry on known transiting planetary systems. If observing systems with uncertain periods (or those with only bounding limits on the period), CHEOPS will be able to help confirm periods by capturing additional transits or ruling out period aliases. These characteristics make CHEOPS an attractive tool for better characterising monotransiting systems discovered as part of the TESS primary mission. Without the ability to fold multiple transits these systems require significant effort to properly characterise but are of interest since they are generally have longer periods than other TESS detections (those that exhibit multiple transits) (Cooke et al 2018) Better characterisation of these systems is vital to help develop our
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