21 September 2012 EChO SWiR: exoplanet atmospheres characterization observatory sort-wave infrared channel of the EChO payload
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Abstract
EChO, a space mission for exoplanets exploration, is considered the next step for planetary atmospheres characterization. It will be a dedicated observatory to uncover a large selected sample of planets spanning a wide range of masses (from gas giants to super-Earths) and orbital temperatures (from hot to habitable). All targets move around stars of spectral types F, G, K, and M. EChO will provide an unprecedented view of the atmospheres of planets in the solar neighbourhood. The consortium formed by various institutions of different countries is proposing an integrated spectrometer payload for EChO covering the wavelength interval 0.4 to 16 µm. This instrument is subdivided into 4 channels: a visible channel, which includes a fine guidance system (FGS) and a VIS spectrometer, a near infrared channel (SWiR), a middle infrared channel (MWiR), and a long wave infrared module (LWiR). In addition, it contains a common set of optics spectrally dividing the wavelength coverage and injecting the combined light of parent stars and their exoplanets into the different channels. The proposed payload meets all of the key performance requirements detailed in the ESA call for proposals as well as all scientific goals. EChO payload will be based on different spectrometers covering the spectral range mentioned above. Among them, SWiR spectrometer will work from 2.45 microns to 5.45 microns. In this paper, the optical and mechanical designs of the SWiR channel instrument, including the evolution of the different trades followed and the current identification of critical points, are reported on.
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Gonzalo Ramos Zapata, Gonzalo Ramos Zapata, Tomás Belenguer, Tomás Belenguer, Ana Balado, Ana Balado, Javier Barandiarán, Javier Barandiarán, Iñaki Armendáriz, Iñaki Armendáriz, Manuel Reina, Manuel Reina, César Arza, César Arza, Santiago Rodríguez, Santiago Rodríguez, Maria Ángeles Alcacera, Maria Ángeles Alcacera, José A. Fernández, José A. Fernández, Elisa Muñoz, Elisa Muñoz, Giovanna Tinetti, Giovanna Tinetti, Paul Eccleston, Paul Eccleston, Bruce Swinyard, Bruce Swinyard, Marc Ferlet, Marc Ferlet, Ian Bryson, Ian Bryson, María Rosa Zapatero, María Rosa Zapatero, "EChO SWiR: exoplanet atmospheres characterization observatory sort-wave infrared channel of the EChO payload", Proc. SPIE 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 84422V (21 September 2012); doi: 10.1117/12.925957; https://doi.org/10.1117/12.925957
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