PREDNASAJUCI / LECTURER :

Zoltán Garai

(1) Astronomical Institute, Slovak Academy of Sciences,
059 60 Tatranská Lomnica

NAZOV / TITLE :

A possible misaligned orbit for the young planet AU Mic c

ABSTRAKT / ABSTRACT :

The AU Microscopii planetary system is only 24 Myr old, and its geometry may provide clues
about the early dynamical history of planetary systems. We present the first measurement of
the Rossiter-McLaughlin effect for the warm sub-Neptune AU Mic c, using two transits observed 
simultaneously with the VLT/ESPRESSO spectrograph, the CHEOPS space observatory, and the NGTS 
photometric facility. We find the sky-projected spin-orbit angle of planet c to be in the
range 67.8 +31.7/-49.0 degrees. We examine the possibility that planet c is misaligned with
respect to the orbit of the inner planet b, and the equatorial plane of the host star, and
discuss scenarios that could explain both this and the planet’s high density.