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We have extended the recent analysis of the SPHERE adaptive optics (AO) performance for faint stars. In particular, we compared the raw contrast reached using the medium-frequency (600 Hz) and low-frequency (300 Hz) modes on different targets with G > 11 mag, and under different atmospheric conditions. We found that using the medium-frequency mode in this magnitude range leads to significantly better contrast. Based on these results, we have updated the AO frequency setup accordingly, that is, we extended the 600 Hz mode by one magnitude, up to 11.5 mag.

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https://ui.adsabs.harvard.edu/abs/2025Msngr.194...19J/abstract

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We have extended the recent analysis of the SPHERE adaptive optics (AO) performance for faint stars. In particular, we compared the raw contrast reached using the medium-frequency (600 Hz) and low-frequency (300 Hz) modes on different targets with G > 11 mag, and under different atmospheric conditions. We found that using the medium-frequency mode in this magnitude range leads to significantly better contrast. Based on these results, we have updated the AO frequency setup accordingly, that is, we extended the 600 Hz mode by one magnitude, up to 11.5 mag.

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