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

Autor(en): H. Bouy, M. Tamura, D. Barrado, K. Motohara, N. Castro Rodríguez, N. Miret-Roig, M. Konishi, S. Koyama, H. Takahashi, N. Huélamo, E. Bertin, J. Olivares, L. M. Sarro, A. Berihuete, J. -C. Cuillandre, P. A. B. Galli, Y. Yoshii, T. Miyata
Abstrakt: 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%).
Organisation(en): Institut für Astrophysik
Externe Organisation(en): Universität Bordeaux, University of Tokyo, National Astronomical Observatory of Japan, European Space Astronomy Centre (ESA), Gran Telescopio Canarias (GRANTECAN), Canada-France-Hawaii Telescope, Universidad Nacional de Educacion a Distancia (UNED), University of Cádiz, Université Paris Saclay, Universidade de São Paulo, University of Arizona
Journal: Astronomy and Astrophysics
Band: 664
ISSN: 0004-6361
DOI: https://doi.org/10.1051/0004-6361/202243850
Publikationsdatum: 08-2022
Peer-reviewed: Ja
ÖFOS 2012: 103003 Astronomie, 103004 Astrophysik
Schlagwörter
ASJC Scopus Sachgebiete: Astronomy and Astrophysics, Space and Planetary Science
Link zum Portal: https://ucrisportal.univie.ac.at/de/publications/14d00db2-6729-4278-bdf5-d9c6b784d41d

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