22 Result(s)

Article

Rapid contraction of giant planets orbiting the 20-million-year-old star V1298 Tau

Current theories of planetary evolution predict that infant giant planets have large radii and very low densities before they slowly contract to reach their final size after about several hundred million years^1,2

A. Suárez Mascareño, M. Damasso, N. Lodieu, A. Sozzetti, V. J. S. Béjar… in Nature Astronomy (2022)

Article

A candidate super-Earth planet orbiting near the snow line of Barnard’s star

Barnard’s star is a red dwarf, and has the largest proper motion (apparent motion across the sky) of all known stars. At a distance of 1.8 parsecs¹, it is the closest single star to the Sun; only the three stars ...

I. Ribas, M. Tuomi, A. Reiners, R. P. Butler, J. C. Morales, M. Perger… in Nature (2018)

Chapter and Conference Paper

Relativistic Modeling of Inclusive Neutrino-Nucleus Interactions in the SuperScaling Approach

We present our recent progresses on the relativistic modeling of reactions (G.D. Megias et al., Phys. Lett. B, 725:170–174, 2003; Phys. Rev. D 89:093002, 2014; M.V. Ivanov et al., Phys. Rev. C 89:014607, 201...

G. D. Megias, J. E. Amaro, M. B. Barbaro… in Basic Concepts in Nuclear Physics: Theory,… (2016)

Chapter and Conference Paper

Formation, Evolution and Multiplicity of Brown Dwarfs and Giant Exoplanets

This proceeding summarizes the talk of the awardee of the Spanish Astronomical Society award to the best Spanish thesis in Astronomy and Astrophysics in the two-year period 2006–2007. The thesis required a tre...

J. A. Caballero in Highlights of Spanish Astrophysics V (2010)

Article

The Substellar Population in the Young σ Orionis Cluster, Spatial Distribution

We review different surveys, in the optical and infrared, conducted in the very young (age 1–8 Myr), nearby (d ∼ 350 pc) σ Orionis cluster aimed to characterize the substellar population. We describe spectral ...

V.J.S. Béjar, J.A. Caballero, R. Rebolo… in Astrophysics and Space Science (2004)

Chapter

The Substellar Population in the Young σ Orionis Cluster, Spatial Distribution

We review different surveys, in the optical and infrared, conducted in the very young (age 1–8 Myr), nearby (d ~ 350 pc) σ Orionis cluster aimed to characterize the substellar population. We describe spectral cha...

V. J. S. Béjar, J. A. Caballero, R. Rebolo… in Magnetic Fields and Star Formation (2004)

Chapter and Conference Paper

Search for Substellar Companions Around Young Nearby Stars

We report on preliminary results on an Adaptive Optics (AO) search for substellar objects (brown dwarfs and giant planets) around young stars (10 – 60 Myr) in the solar neighbourhood (d < 50 pc). Objects below th...

J. A. Caballero, R. Rebolo, V. J. S. Béjar… in Highlights of Spanish Astrophysics III (2003)

Chapter and Conference Paper

Relativity in Polarized Electron Scattering Observables

Coincidence scattering of polarized electrons from nuclei with polarization transfer to outgoing nucleons is studied within the context of relativistic mean field theory. Effects introduced by the dynamical en...

J. A. Caballero, M. C. Martínez, T. W. Donnelly… in Nuclear Dynamics: From Quarks to Nuclei (2003)

Article

Momentum distribution of relativistic nuclei with Hartree-Fock mesonic correlations

The impact of Hartree-Fock correlations on the nuclear momentum distribution is studied in a fully relativistic one-boson-exchange model. Hartree-Fock equations are exactly solved to first order in the couplin...

J.E. Amaro, M.B. Barbaro, J.A. Caballero… in The European Physical Journal A - Hadrons … (2002)

Chapter

New Aspects of Nuclear Structure and QE Electron Scattering

We focus here on two aspects of Nuclear Structure that are of major interest currently, i) Relativistic dynamics of bound nucleons. ii) Halo nuclear structures. We discuss how these aspects can be probed with ...

E. Moya de Guerra, J. A. Caballero… in Nuclei Far from Stability and Astrophysics (2001)

Article

Dry and Wet Etch Processes for NiMnSb, LaCaMnO₃ and Related Materials

A variety of plasma etching chemistries were examined for patterning NiMnSb Heusler thin films and associated A1₂O₃ barrier layers. Chemistries based on SF₆ and Cl₂ were all found to provide faster etch rates tha...

J. Hong, J. J. Wang, E. S. Lambers, J. A. Caballero… in MRS Online Proceedings Library (1997)

Article

Magnetic Properties of Multilayered Co-Cu Granular Composites

The magnetic properties of granular CO₂₅Cu₇₅/CU multilayer films prepared by sputtering onto heated glass substrates have been investigated in the range of ultrathin alloy films (5–250Å) and Cu spacer thicknesses...

A. Cabbibo, J. A. Caballero, Y. D. Park, J. R. Childress in MRS Online Proceedings Library (1997)

Article

Transport Measurements of Magnetic Multilayers at Reduced Lateral Dimensions

Y. D. Park, H. D. Hudspeth, T. J. Schultz, A. Cabbibo… in MRS Online Proceedings Library (1997)

Article

Structural and Magnetotransport Properties of NiMnSb/Cu and NiMnSb/Ag Multilayers

We report on the integration of the predicted half-metallic (100% spin-polarized) ferromagnetic Heusler alloy NiMnSb into NiMnSb/Cu and NiMnSb/Ag multilayer structures, and on their magnetic, microstructural a...

J. A. Caballero, F. Petroff, A. Cabbibo, Y. D. Park… in MRS Online Proceedings Library (1997)

Article

Low-Temperature Growth of NiMnSb Heusler Alloy Thin Films

Ferromagnetic Heusler alloys such as NiMnSb may have unique applications to magnetoresistive devices because of their predicted half-metallic band-structure (i.e., 100% spin-polarized at the Fermi level). Howe...

J. R. Childress, J. A. Caballero, W. J. Geerts… in MRS Online Proceedings Library (1997)

Article

Sputter-deposition of NiMnSb magnetic thin films from a composite target onto Si substrates

We have deposited ferromagnetic NiMnSb thin films by sputtering from a single composite target onto Si wafer substrates. Similarly to earlier results using glass substrates, we find that a combination of low r...

J. A. Caballero, Y. D. Park, A. Cabbibo, J. R. Childress in Journal of Electronic Materials (1997)

Article

AFM Analysis of ECR Dry-Etched InGaP, AlInP and AlGaP

The etch rates of InGaP, AlInP and AlGaP increases dramatically with microwave power in ECR BC1₃- or CH₄/H₂-based discharges, reaching values near lµm-min⁻¹ at 1000W, The surface morphologies of these materials h...

F. Ren, W. S. Hobson, J. R. Lothian, J. Lopata… in MRS Online Proceedings Library (1995)