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Direct imaging and spectroscopy of planets and brown dwarfs in wide orbits†

Published online by Cambridge University Press:  10 November 2011

Mariangela Bonavita ,
Ray Jayawardhana ,
Markus Janson  and
David Lafrenière
Mariangela Bonavita
Affiliation:
Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street M5S 3H4 Toronto ONCanada email: bonavita@lepus.astro.utoronto.ca
Ray Jayawardhana
Affiliation:
Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street M5S 3H4 Toronto ONCanada email: bonavita@lepus.astro.utoronto.ca
Markus Janson
Affiliation:
Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street M5S 3H4 Toronto ONCanada email: bonavita@lepus.astro.utoronto.ca
David Lafrenière
Affiliation:
Département de Physique, Université de Montréal, C.P. 6128 Succ. Centre-Ville, Montréal, QC H3C 3J7, Canada
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Abstract

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Recent direct imaging discoveries of exoplanets have raised new questions about the formation of very low-mass objects in very wide orbits. Several explanations have been proposed, but all of them run into some difficulties, trying to explain all the properties of these objects at once. Here we present the results of a deep adaptive optics imaging survey of 85 stars in the Upper Scorpius young association with Gemini, reaching contrasts of up to 10 magnitudes. In addition to identifying numerous stellar binaries and a few triples, we also found several interesting sub-stellar companions. We discuss the implications of these discoveries, including the possibility of a second pathway to giant planet formation.

Keywords

brown dwarfsplanetary systemsstars: low-massstars: pre-main-sequence
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S276: The Astrophysics of Planetary Systems: Formation, Structure, and Dynamical Evolution , October 2010 , pp. 113 - 116
Copyright
Copyright © International Astronomical Union 2011

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