Ultracool dwarfs in ALHAMBRA and COSMOS

Ultracool dwarfs (UCDs) encompass a wide variety of compact stellar-like objects with spectra classified as late-M, L, T, and Y. Most of them have been discovered using...超冷矮星（Ultracool dwarfs, UCDs）涵盖了多种光谱归类为晚M型、L型、T型及Y型的致密类恒星天体。其中绝大多数是通过……发现的。