BOUY, H.; TAMURA, M.; BARRADO, D.; MOTOHARA, K.; CASTRO RODRÍGUEZ, N.; MIRET-ROIG, N.; KONISHI, M.; KOYAMA, S.; TAKAHASHI, H.; HUÉLAMO, N.; BERTIN, E.; OLIVARES, J.; SARRO, L. M.; BERIHUETE, A.; CUILLANDRE, J. -C.; GALLI, P. A. B.; YOSHII, Y.; MIYATA, T.

doi:10.1051/0004-6361/202243850

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BOUY, H.
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]

TAMURA, M.

BARRADO, D.

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Ce document a été publié dans

Astronomy and Astrophysics - A&A. 2022, vol. 664

EDP Sciences

Résumé en anglais

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 <A href="http://cdsarc.u-strasbg.fr/">cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/664/A111">http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/664/A111</A>< Réduire

Mots clés en anglais

brown dwarfs

stars: late-type

stars: pre-main sequence

planets and satellites: formation

Astrophysics - Solar and Stellar Astrophysics

Astrophysics - Earth and Planetary Astrophysics

DOI

http://dx.doi.org/10.1051/0004-6361/202243850

Project ANR

Initiative d'excellence de l'Université de Bordeaux

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Importé de hal

Unités de recherche

Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804