S22B0034
S22B0034
After discovering >100 free-floating planets (FFPs) in the Upper Scorpius OB association (βΌ3500 members), we recently discovered 100 FFPs in the Taurus clouds (βΌ900 members). This implies that FFP formation is 4 to 5 times more efficient in a sparsely populated molecular clouds with no massive stars (Taurus) than in a dense and massive OB association (USco), and is a direct measurement of the influence of the initial conditions and feedback on star formation. FFP are exquisitely sensitive to inborn and evolutionary effects, and provide a unique opportunity to study the effect of the initial conditions, early dynamical evolution and feedback on the star formation process and planetary systems architecture. We propose to use SWIMS to obtain spectra of 15 high-probability FFPs of the Taurus star forming region. Combined with SWIMS observations of FFPs in Upper Sco (P.I. Tamura, S21A), we will be able to perform a robust comparison of the FFPs properties in 2 very different environments. These spectra are needed to: 1) confirm the nature and youth of these objects and refine the statistics to compare the two environments; 2) derive accurate Teff and logg and improved masses and luminosities, 3)study the atmosphere of young planetary mass objects down to 4MJup.
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