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First Evidence of a Precessing Jet Excavating a Protostellar Envelope
Jason E. Ybarra, Mary Barsony, Karl E. Haisch +3
We present new, sensitive, near-infrared images of the Class I protostar, Elias 29, in the Ophiuchus cloud core. To explore the relationship between the infall envelope and the out…
New observational frontiers in the multiplicity of young stars
G. Duchene, E. Delgado-Donate, K. Haisch +2
It has now been known for over a decade that low-mass stars located in star-forming regions are very frequently members of binary and multiple systems, even more so than main seque…
A Near-Infrared Multiplicity Survey of Class I/Flat-Spectrum Systems in Six Nearby Molecular Clouds
Karl E. Haisch, Thomas P. Greene, Mary Barsony +1
We present new near-IR observations of 76 Class I/flat-spectrum objects in the nearby (d < 320 pc) Perseus, Taurus, Chamaeleon I and II, rho Ophiuchi, and Serpens dark clouds. Thes…
Close Companions to Nearby Young Stars from Adaptive Optics Imaging on VLT and Keck
Karl E. Haisch, Ray Jayawardhana, Alexis Brandeker +1
We report the results of VLT and Keck adaptive optics surveys of known members of the Eta Chamaeleontis, MBM 12, and TW Hydrae (TWA) associations to search for close companions. Th…
Observational Clues to Brown Dwarf Origins
Ray Jayawardhana, Subhanjoy Mohanty, Gibor Basri +3
Over the past year, we have conducted a multi-faceted program to investigate the origin and early evolution of brown dwarfs. Using high-resolution Keck optical spectra of ~30 objec…
A Disk Census for Young Brown Dwarfs
Ray Jayawardhana, David R. Ardila, Beate Stelzer +1
Recent surveys have identified sub-stellar objects down to planetary masses in nearby star-forming regions. Reliable determination of the disk frequency in young brown dwarfs is of…