The LISEN Survey: looking for exoplanets in the Northern sky
We present LISEN, an L’-band direct imaging exoplanet survey in the Northern hemisphere, that makes use of the LMIRCam at the LBT (Arizona) to search for Giant Planets around nearby, young stars with disks.
The direct imaging technique offers several advantages over other exoplanet detection techniques: it can target young active stars and detect Giant Planets at large separation (> 5 au), thus probing a parameter space that is inaccessible to other, indirect methods like radial velocity and transit. Furthermore, it allows a direct photometric characterisation of companions.
The primary targets of the LISEN survey are stars with disks that shows signs of ongoing planet formation, such as protoplanetary disks with gaps and inner cavities, and those harbouring debris disks.
These are the best places to forming or recently formed planets, and the LISEN survey will thus help to shed light on planet formation and early evolution, and planet-disk interaction.
The observations are carried out in the L’-band, which is favourable in terms of companion-star contrast and may allow to detect the planet while still embedded in the circumstellar disk.
We will present an overview of the LISEN survey (selection criteria for the targets, observation strategy and data reduction), together with the results from the first year of observations, in terms of overall achieved sensitivity as well as companion candidates detection and analysis.