How frequent is the Solar System? What can be learned on young planets coupling high contrast imaging with space astrometry

by Raffaele Gratton (INAF/OAPD)

Wednesday 27 Sept 2023, 11:30 → 12:30 Europe/Rome

Sala Jappelli (Osservatorio Astronomico di Padova)

The recent availability of reliable astrometric accelerations from the combination of Gaia and Hipparcos allowed targeted search of low-mass companions at separations similar to the giant planets in the Solar System, using the direct imaging technique.
Among several new detections, the planet around the young star AF Lep is of particular interest, joining a small but significant sample of substellar companions at separations close to the ice snow line in the 20 Myr beta Pic moving group.
We will present a statistical analysis of the frequency of planetary companions in this group and an ensemble analysis of the photometric properties of low mass objects.  
A large frequency of Jovian analogues is reported for the beta Pic moving group, once the disruptive dynamical effects of close binaries is taken into account.
We also identified a possible systematic difference between companions close enough to have likely formed in the circumstellar disk with respect to isolated objects. 
Possible scenarios to explain these observations will be discussed.

 

 

 

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Meeting ID: 852 7319 8731
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