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Infrared Spectroscopy of free-floating planet candidates in Upper Scorpius and Ophiuchus
- Source :
- A&A 664, A111 (2022)
- Publication Year :
- 2022
-
Abstract
- Context: A rich population of low-mass brown dwarfs and isolated planetary mass objects has been reported recently 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 investigate the membership by looking for evidences of youth using four diagnostics: the slope of the continuum between the J and Ks band, the Hcont and TLI-g gravity sensitive indices, and by comparing 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 lower than 6%<br />Comment: Accepted on 2022 June 2. Pending language revision
Details
- Database :
- arXiv
- Journal :
- A&A 664, A111 (2022)
- Publication Type :
- Report
- Accession number :
- edsarx.2206.00916
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1051/0004-6361/202243850