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Infrared spectroscopy of free-floating planet candidates in Upper Scorpius and Ophiuchus

Abstract : Context. A rich population of low-mass brown dwarfs and isolated planetary mass objects has been reported in the Upper Scorpius and Ophiuchus star-forming complex.
Aims: We investigate the membership, nature, and properties of 17 of these isolated planetary mass candidates using low-resolution near-infrared spectra.
Methods: We investigated the membership by looking for evidence of their youth using four diagnostics: the slope of the continuum between the J and Ks band, the Hcont, and the TLI-g gravity-sensitive indices. In addition, we compared the spectra to young and field (old) M and L-dwarf standards.
Results: All the targets but one are confirmed as young ultracool objects, with spectral types between L0 and L6 and masses in the range 0.004-0.013 M, according to evolutionary models. The status of the last target is unclear at this point.
Conclusions: Only one possible contaminant has been identified among the 17 targets, suggesting that the contamination level of the original sample must be low (≲6%).

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https://hal-insu.archives-ouvertes.fr/insu-03846756
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Submitted on : Thursday, November 10, 2022 - 1:21:37 PM
Last modification on : Saturday, November 12, 2022 - 3:27:03 AM

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H. Bouy, M. Tamura, D. Barrado, K. Motohara, N. Castro Rodríguez, et al.. Infrared spectroscopy of free-floating planet candidates in Upper Scorpius and Ophiuchus. Astronomy and Astrophysics - A&A, 2022, 664, ⟨10.1051/0004-6361/202243850⟩. ⟨insu-03846756⟩

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