@inproceedings{discovery10197949, pages = {130921C}, note = {This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions.}, journal = {Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave}, year = {2024}, title = {The telescope assembly of the Ariel space mission: an updated overview}, address = {Bellingham, WA, USA}, month = {August}, volume = {13092}, editor = {Laura E Coyle and Shuji Matsuura and Marshall D Perrin}, booktitle = {Proceedings of SPIE: Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave}, publisher = {SPIE}, author = {Pace, Emanuele and Adler Abreu, Manuel and Alonso, Gustavo and Barroqueiro, Bruno and Bocchieri, Andrea and Brienza, Daniele and Brucalassi, Anna and Chioetto, Paolo and Compostizo, Carlos and Cortecchia, Fausto and D'Anca, Fabio and Del Vecchio, Ciro and Diolaiti, emiliano and Eccleston, Paul and Fahmy, Salma and Fernandes, Jos{\'e} and Fernandez Soler, Alejandro and Ferruzzi, Debora and Focardi, Mauro and Freitas, Sara and Galy, Camille and Garcia Moreno, Laura and Garcia Perez, Andres and Gottini, Daniele and Guerriero, Elisa and Halain, Jean-Philippe and Hellin, Marie-Laure and Jollet, Delphine and Lilli, Riccardo and Malaguti, Giuseppe and Mart{\`i}, Laura and Mazzoli, Alexandra and Micela, Giuseppina and Morgante, Gianluca and Naponiello, Luca and Noce, Vladimiro and Pascale, Enzo and Perez Alvarez, Javier and Piazzolla, Raffaele and Picchi, Paolo and Preti, Giampaolo and Roose, Stephane and Salatti, Mario and Salvignol, Jean-Christophe and Scippa, Antonio and Serre, Christophe and Terenzi, Luca and Tinetti, Giovanna and Di Vignano, Elisabetta Tommasi and Tozzi, Andrea and Vandenbussche, Bart and Zuppella, Paola}, url = {http://dx.doi.org/10.1117/12.3018735}, abstract = {Ariel (Atmospheric Remote-Sensing Infrared Exoplanet Large Survey) is the adopted M4 mission in the framework of the ESA "Cosmic Vision" program. Its purpose is to survey the atmospheres of known exoplanets through transit spectroscopy. The launch is scheduled for 2029. The scientific payload consists of an off-axis, unobscured Cassegrain telescope feeding a set of photometers and spectrometers in the waveband 0.5-7.8 um and operating at cryogenic temperatures (55 K). The Telescope Assembly is based on an innovative fully aluminium design to tolerate thermal variations to avoid impacts on the optical performance; it consists of a primary parabolic mirror with an elliptical aperture of 1.1 m (the major axis), followed by a hyperbolic secondary that is mounted on a refocusing system, a parabolic re-collimating tertiary and a flat folding mirror directing the output beam parallel to the optical bench. An innovative mounting system based on 3 flexure hinges supports the primary mirror on one of the optical bench sides. The instrument bay on the other side of the optical bench houses the Ariel IR Spectrometer (AIRS) and the Fine Guidance System / NIR Spectrometer (FGS/NIRSpec). The Telescope Assembly is in phase B2 towards the Critical Design Review; the fabrication of the structural and engineering models has started; some components, i.e., the primary mirror and its mounting system are undergoing further qualification activities. This paper aims to update the scientific community on the progress concerning the development, manufacturing and qualification activity of the ARIEL Telescope Assembly.} }