Infrared spectroscopy of free-floating planet candidates in Upper Scorpius and Ophiuchus - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2022

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

M. Tamura
  • Function : Author
D. Barrado
  • Function : Author
K. Motohara
  • Function : Author
N. Castro Rodríguez
  • Function : Author
M. Konishi
  • Function : Author
S. Koyama
  • Function : Author
H. Takahashi
  • Function : Author
N. Huélamo
  • Function : Author
J. Olivares
  • Function : Author
L. M. Sarro
  • Function : Author
A. Berihuete
  • Function : Author
P. A. B. Galli
  • Function : Author
Y. Yoshii
  • Function : Author
T. Miyata
  • Function : Author

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%).

Full Table B.4 is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/664/A111

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insu-03846756 , version 1 (10-11-2022)

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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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