4 papers
Halo stars harbour few wide ultracool companions
Jerry Jun-Yan Zhang, Nicolas Lodieu, Eduardo L. MartÃn
We conducted the first search for wide ultracool companions to metal-poor halo stars. A sample of nearby halo stars with spectroscopically determined metallicities and high proper…
Integral field spectroscopy with no IFUs: combining wide-field rotational slitless spectroscopy with tomographic reconstruction
Jerry Jun-Yan Zhang, Francesco Sinigaglia
Among spectroscopic techniques, Integral Field Spectroscopy (IFS) is regarded as one of the most versatile and powerful, but it is limited by small FoVs, complex designs, and high…
Optical constraints on the coldest metal-poor population
Jerry Jun-Yan Zhang, Nicolas Lodieu, Eduardo L. MartÃn +10
The coldest metal-poor population made of T and Y dwarfs are archaeological tracers of our Galaxy because they are very old and have kept the pristine material. The optical propert…
Reconnaissance ultracool spectra in the Euclid Deep Fields
Jerry Jun-Yan Zhang, Nicolas Lodieu, Eduardo MartÃn
Context. Euclid will carry out a deep survey benefiting the discovery and characterisation of ultracool dwarfs (UCDs), especially in the Euclid Deep Fields (EDFs), which the telesc…