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Infrared Spectroscopy of the Ultra Low Mass Binary Oph 162225-240515
Alexis Brandeker, Ray Jayawardhana, Valentin D. Ivanov +1
Binary properties are an important diagnostic of the star and brown dwarf formation processes. While wide binaries appear to be rare in the sub-stellar regime, recent observations…
Deficit of wide binaries in the eta Chamaeleontis young cluster
Alexis Brandeker, Ray Jayawardhana, Parandis Khavari +2
We have carried out a sensitive high-resolution imaging survey of stars in the young (6-8 Myr), nearby (97 pc) compact cluster around eta Chamaeleontis to search for stellar and su…
Accretion Disks around Young Stars: Lifetimes, Disk Locking and Variability
Ray Jayawardhana, Jaime Coffey, Alexander Scholz +2
We report the findings of a comprehensive study of disk accretion and related phenomena in four of the nearest young stellar associations spanning 6-30 million years in age, an epo…
Braking the Gas in the beta Pictoris Disk
Rodrigo Fernández, Alexis Brandeker, Yanqin Wu
(Abridged) The main sequence star beta Pictoris hosts the best studied circumstellar disk to date. Nonetheless, a long-standing puzzle has been around since the detection of metall…