ANDES, the high-resolution spectrograph of the ELT: simulated performance of the CORO module and overview of the high-contrast capabilities for exoplanet observations

M. N'Diaye; A. Simonnin; A. Spang; P. Berio; A. Chiavassa; G. Agapito; C. Bailet; G. Carlà; Y. Caujolle; O. Carrión-Gonzalez; G. Chauvin; S. Cuevas; O. Gabella; M. Houllé; S. Lagarde; P. Martinez; E. Pinna; B. Rajpoot; J. Seidel; C. Selmi; A. Vigan; P. Di Marcantonio

arXiv · 2607.23555

ANDES, the high-resolution spectrograph of the ELT: simulated performance of the CORO module and overview of the high-contrast capabilities for exoplanet observations

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Abstract

We present the simulated performance of the coronagraph (CORO) module for ANDES, the Extremely Large Telescope (ELT) high-resolution spectrograph. ANDES aims to address a broad range of science cases, including the characterization of the atmosphere of exoplanets. With a first light envisioned by 2035, the instrument baseline features a modular fiber-fed echelle spectrograph with visible and near-infrared ultra-stable spectral arms to provide a simultaneous spectral range of 0.4-1.8\,$\mu$m with a spectral resolving power up to 100,000. ANDES also includes an Integral Field Unit (IFU) mode-fed by a single-conjugate adaptive optics (SCAO) module and an insertable CORO module, enabling the combination of high-contrast imaging and high-dispersion spectroscopy (R=100,000) for the study of exoplanet properties. In this contribution, the ANDES CORO design, its main features and its simulated performance are detailed in the presence of SCAO residual errors to probe exoplanet atmospheres with the spectro-imager mode at high-spatial resolution and with unprecedented angular resolution. We show the preliminary simulation results on the predicted contrast and the expected detection performance with ANDES performance unfolded (APU), the simulation tool to determine the yield of exoplanets that will be detected in emitted and possibly reflected light. The characterization operation of the instrument will be discussed to assess the ANDES ability to detect atomic and molecular signatures connected to the exoplanet atmosphere characteristics.

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M. N'Diaye, A. Simonnin, A. Spang, P. Berio, A. Chiavassa, G. Agapito, C. Bailet, G. Carlà, Y. Caujolle, O. Carrión-Gonzalez, G. Chauvin, S. Cuevas, O. Gabella, M. Houllé, S. Lagarde, P. Martinez, E. Pinna, B. Rajpoot, J. Seidel, C. Selmi, A. Vigan, P. Di Marcantonio. 2026-07-26. ANDES, the high-resolution spectrograph of the ELT: simulated performance of the CORO module and overview of the high-contrast capabilities for exoplanet observations. https://arxiv.org/abs/2607.23555

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