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9 papers · 2 filters
A single sub-km Kuiper Belt object from a stellar Occultation in archival data
H. E. Schlichting, E. O. Ofek, M. Wenz +5
The Kuiper belt is a remnant of the primordial Solar System. Measurements of its size distribution constrain its accretion and collisional history, and the importance of material s…
Discovery of the Coldest Imaged Companion of a Sun-Like Star
Christian Thalmann, Joseph Carson, Markus Janson +17
We present the discovery of a brown dwarf or possible planet at a projected separation of 1.9" = 29 AU around the star GJ 758, placing it between the separations at which substella…
Forming Planetesimals in Solar and Extrasolar Nebulae
E. Chiang, A. Youdin
Planets are built from planetesimals: solids larger than a kilometer which grow by colliding pairwise. Planetesimals themselves are unlikely to form by two-body collisions; sub-km…
Particle Clumping and Planetesimal Formation Depend Strongly on Metallicity
Anders Johansen, Andrew Youdin, Mordecai-Mark Mac Low
We present three-dimensional numerical simulations of particle clumping and planetesimal formation in protoplanetary disks with varying amounts of solid material. As centimeter-siz…
The Runts of the Litter: Why planets formed through gravitational instability can only be failed binary stars
Kaitlin M. Kratter, Ruth A. Murray-Clay, Andrew N. Youdin
Recent direct imaging discoveries suggest a new class of massive, distant planets around A stars. These widely separated giants have been interpreted as signs of planet formation d…
Near Infrared Observations of GQ Lup b Using the Gemini Integral Field Spectrograph NIFS
Jean-Francois Lavigne, Rene Doyon, David Lafreniere +2
We present new JHK spectroscopy (R ~ 5000) of GQ Lup b, acquired with the near-infrared integral field spectrograph NIFS and the adaptive optics system ALTAIR at the Gemini North t…