# University of Hertfordshire

## High contrast imaging at ten microns, a search for exoplanets around: Eps Indi A, Eps Eri, Tau Ceti, Sirius A and Sirius B

Research output: Contribution to journalArticlepeer-review

### Documents

• P. Pathak
• D. J. M. Petit dit de la Roche
• M. Kasper
• M. Sterzik
• O. Absil
• A. Boehle
• F. Feng
• V. D. Ivanov
• M. Janson
• H. R. A. Jones
• A. Kaufer
• H. -U. Käufl
• A. -L. Maire
• M. Meyer
• E. Pantin
• R. Siebenmorgen
• M. E. van den Ancker
• G. Viswanath
Original language English A121 10 Astronomy & Astrophysics 652 https://doi.org/10.1051/0004-6361/202140529 Published - 18 Aug 2021

### Abstract

The direct imaging of rocky exoplanets is one of the major science goals for upcoming large telescopes. The contrast requirement for imaging such planets is challenging. However, the mid-IR (InfraRed) regime provides the optimum contrast to directly detect the thermal signatures of exoplanets in our solar neighbourhood. We aim to exploit novel fast chopping techniques newly developed for astronomy with the aid of adaptive optics to look for thermal signatures of exoplanets around bright stars in the solar neighbourhood. We use the upgraded VISIR (Very Large Telescope Imager and Spectrometer for the mid-InfraRed) instrument with high contrast imaging (HCI) capability optimized for observations at 10~$\mu$m to look for exoplanets around five nearby ($d$ <4 pc) stars. The instrument provides an improved signal-to-noise (S/N) by a factor of $\sim$4 in the N-band compared to standard VISIR for a given S/N and time. In this work we achieve a detection sensitivity of sub-mJy, which is sufficient to detect few Jupiter mass planets in nearby systems. Although no detections are made we achieve most sensitive limits within \$

### Notes

© ESO 2021. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1051/0004-6361/202140529

ID: 25096128