E. L. Martín

Halo stars harbour few wide ultracool companions

J. J. Zhang, N. Lodieu, E. L. Martín

Aims. Our goal is to provide a wide ultracool companion frequency for metal-poor halo stars for the first time. Methods. We selected nearby halo stars with spectroscopically determined high proper motions and metallicities. We collected first-epoch deep J -band imaging around these …

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Disk fraction among free-floating planetary-mass objects in Upper Scorpius

T. Rodrigues, H. Bouy, S. N. Raymond, E. L. Martín et autres

Context. Free-floating planetary-mass objects (FFPs) have been detected through direct imaging in several young, nearby star-forming regions. The properties of circumstellar disks around these objects may provide a valuable probe into their origin but are currently limited by the small sample sizes …

fr, es, cu (code pays fourni par la source)

The wide binary frequency of metal-poor stars

N. Lodieu, A. Pérez Garrido, E. L. Martín, R. Rebolo López et autres

Context. This study is aimed at identifying possible low-mass and sub-stellar companions to stars with well-determined metallicities. We investigate the multiplicity of metal-poor stars along with its impact on formation processes in the conditions of the early universe. Aims. Our goal is …

es (code pays fourni par la source)

The wide binary frequency of metal-poor stars

Nicolas Lodieu, Antonio Pérez-Garrido, J.-Y. Zhang, E. L. Martín et autres

This study is aimed at identifying possible low-mass and sub-stellar companions to stars with well-determined metallicities. We investigate the multiplicity of metal-poor stars along with its impact on formation processes in the conditions of the early universe. Our goal is to look …

es (code pays fourni par la source)

The cosmic waltz of Coma Berenices and Latyshev 2 (Group X). Membership, phase-space structure, mass, and energy distributions

Javier de Otazu Olivares, N. Lodieu, V. J. S. Béjar, E. L. Martín et autres

Context. Open clusters (OCs) are fundamental benchmarks where theories of star formation and stellar evolution can be tested and validated. Coma Ber and Latyshev 2 (Group X) are the second and third OCs closest to the Sun, making them excellent targets to …