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5 papers · 2 filters
Sub-stellar Companions and Stellar Multiplicity in the Taurus Star-Forming Region
Sebastian Daemgen, Mariangela Bonavita, Ray Jayawardhana +2
We present results from a large, high-spatial-resolution near-infrared imaging search for stellar and sub-stellar companions in the Taurus-Auriga star-forming region. The sample co…
The variability of the Crab Nebula in radio: No radio counterpart to gamma-ray flares
Michael F. Bietenholz, Y. Yuan, R. Buehler +2
We present new Jansky Very Large Array (VLA) radio images of the Crab Nebula at 5.5 GHz, taken at two epochs separated by 6 days about two months after a gamma-ray flare in 2012 Ju…
A Deep Spitzer Survey of Circumstellar Disks in the Young Double Cluster, h and chi Persei
Ryan Cloutier, Thayne Currie, George Rieke +3
We analyze very deep IRAC and MIPS photometry of 12,500 members of the 14 Myr old Double Cluster, h and Persei, building upon on our earlier, shallower Spitzer studies (…
A new sub-stellar companion around the young star HD 284149
Mariangela Bonavita, Sebastian Daemgen, Silvano Desidera +3
Even though only a handful of sub-stellar companions have been found via direct imaging, each of these discoveries has had a tremendous impact on our understanding of the star form…
Strong Brightness Variations Signal Cloudy-to-Clear Transition of Brown Dwarfs
Jacqueline Radigan, David Lafrenière, Ray Jayawardhana +1
[ABRIDGED] We report the results of a band search for cloud-related variability in the atmospheres of 62 L4-T9 dwarfs using the Du Pont 2.5-m telescope at Las Campanas Observat…