Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010lyot.confe..21l&link_type=abstract
Proceedings of the conference In the Spirit of Lyot 2010: Direct Detection of Exoplanets and Circumstellar Disks. October 25 -
Astronomy and Astrophysics
Astronomy
Scientific paper
In September 2008 we announced the direct imaging discovery of a young planet likely in orbit around the star 1RXS J160929.1-210524, a roughly solar-mass member of the 5 Myr old Upper Scorpius association. The evidence for the youth, temperature (∼1800 K), and mass (∼8 Mjup) of the object from near-infrared imaging and spectroscopy was very clear, but its projected separation, a whopping 330 AU, was rather surprising for such a low mass object. We have now obtained two years of follow-up astrometric measurements and the data clearly confirm that the companion is co-moving with the primary star, which we interpret as evidence that it is a truly bound companion. 1RXS J1609b is the least massive companion known to date to orbit a star at such a large distance; it shows that planetary mass objects do exist at orbital separations of several hundred AUs, posing a challenge for formation models. In this talk I will summarize the various observations of this planet, discuss its physical properties and speculate about how it could have formed.
Jayawardhana Ray
Lafreniere David
van Kerkwijk Marten
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