Optical spectroscopy of isolated planetary mass objects in the σ Orionis cluster
We have obtained low resolution optical spectra of 15 isolated planetary mass objects (IPMOs) in the sigma Orionis cluster, and derived spectral types by comparison with nearby M and L dwarfs. The spectral types are in the range late M - mid L, in agreement with our expectations based on colors and magnitudes for bona fide members. Therefore, most
Barrado y Navascués, D. et al.
Fecha de publicación:
10
2001