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![]() In phase-resolved emission spectroscopy multiple emission spectra are obtained as a function of phase.īoth transit and eclipse spectroscopy operate in the time domain, relying on high precision spectrophotometric light curve measurements. Eclipse spectra have detected molecular species including water, methane, CO and CO 2. The similar technique of eclipse spectroscopy returns the dayside emission spectra of the exoplanet, and can provide constraints on the vertical temperature-pressure profile of the atmosphere. It has been used to discover atmospheric atomic species such as sodium, potassium, hydrogen and helium, hazes and clouds, and molecular species including water. This technique returns the transmission spectrum at the day-night terminator. , has been the major technique used to obtain exoplanet spectra to date. Transit spectroscopy, theorized by Seager and Sasselov and first demonstrated by Charbonneau et al. ![]() Such observations can help to constrain theories of planet migration, formation and evolution, shedding light on the mechanisms underlying the great diversity seen in the exoplanet population. The characterization of exoplanets through spectroscopic analysis of their atmospheres is key to fully understanding the properties of the individual planets. Today thousands of exoplanets have been confirmed, revealing a diverse population in size, mass, temperature and orbital properties. ExoSim has been used extensively in the Phase A and B design studies of the ARIEL mission, and has many potential applications in the field of transit spectroscopy. A dedicated star spot simulator allows ExoSim to produce simulated observations that include spot and facula contamination. ExoSim can interact with other models which simulate specific time-dependent processes. We find ExoSim is accurate to within 5% in most comparisons. It has also been extensively validated, including against real results from the Hubble WFC3 instrument. It performs a dynamical simulation that can capture temporal effects such as correlated noise and systematics on the light curve. ExoSim improves on previous simulators in the complexity of its simulation, versatility of use and its ability to be generically applied to different instruments. We developed ExoSim: an end-to-end simulator that models noise and systematics in a dynamical simulation. ![]() ![]() A new generation of exoplanet research beckons and with it the need for simulation tools that accurately predict signal and noise in transit spectroscopy observations. ![]()
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