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4 papers · 2 filters
The substellar population of Sigma Orionis: A deep wide survey
V. J. S. Béjar, M. R. Zapatero Osorio, R. Rebolo +5
We present a deep I,Z photometric survey covering a total area of 1.12 deg^{2} of the Sigma Orionis cluster (Icompl=22 and Zcompl=21.5mag). From I, I-Z color-magnitude diagrams we…
Near-infrared Linear Polarization of Ultracool Dwarfs
M. R. Zapatero Osorio, V. J. S. Béjar, B. Goldman +5
We report on near-infrared J- and H-band linear polarimetric photometry of eight ultracool dwarfs (two late-M, five L0-L7.5, and one T2.5) with known evidence for photometric varia…
Search and characterization of T-type planetary mass candidates in the sigma Orionis cluster
K. Peña Ramírez, M. R. Zapatero Osorio, V. J. S. Béjar +2
(Abridged) We aim to: i) confirm the presence of methane absorption in S Ori 73 (a T-type member candidate of the sig Orionis cluster, 3 Myr, 352 pc) through methane imaging; ii) s…
Characterizing the atmospheres of transiting rocky planets around late type dwarfs
E. Pallé, M. R. Zapatero Osorio, A. García Muñoz
Visible and near-infrared spectra of transiting hot Jupiter planets have recently been observed, revealing some of the atmospheric constituents of their atmospheres. In the near fu…