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Direct imaging and spectroscopy of planets around young stars: GQ Lupi

Published online by Cambridge University Press:  02 May 2006

Ralph Neuhäuser ,
Christopher Broeg ,
Markus Mugrauer  and
Eike Guenther
Ralph Neuhäuser
Affiliation:
Astrophysikalisches Institut und Universitäts-Sternwarte, Schillergäßchen 2, D-07745 Jena, Germany emails: rne@astro.uni-jena.de, broeg@astro.uni-jena.de, markus@astro.uni-jena.de
Christopher Broeg
Affiliation:
Astrophysikalisches Institut und Universitäts-Sternwarte, Schillergäßchen 2, D-07745 Jena, Germany emails: rne@astro.uni-jena.de, broeg@astro.uni-jena.de, markus@astro.uni-jena.de
Markus Mugrauer
Affiliation:
Astrophysikalisches Institut und Universitäts-Sternwarte, Schillergäßchen 2, D-07745 Jena, Germany emails: rne@astro.uni-jena.de, broeg@astro.uni-jena.de, markus@astro.uni-jena.de
Eike Guenther
Affiliation:
Thüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany email: guenther@tls-tautenburg.de
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Abstract

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Neuhäuser et al. (2005a) presented evidence for a sub-stellar, common proper motion companion to GQ Lup, which is almost certainly a planet imaged directly, based on two independent mass estimates by means of theoretical models. The magnitude of GQ Lup b was determined by relative photometry compared to GQ Lup A. During a one-month monitoring of the primary star, we found is to be a variable with K= 6.9 to 7.3 mag (absolute photometry). Then, we re-observed GQ Lup A+b in May 2005, again with VLT/NACO. Due to the monitoring in April 2005, we could predict the exact K-band magnitude range of the primary during the new AO observation. Hence, we could determine a more precise error of the K-band magnitude of GQ Lup b by relative photometry compared to the primary. The new value is consistent with the previous estimate within the error margin, so that also the conclusions in Neuhäuser et al. (2005a,b) about its very low mass remain valid.

Keywords

GQ Lup bdirect imaging
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C200: Direct Imaging of Exoplanets: Science & Techniques , October 2005 , pp. 41 - 46
Copyright
© 2006 International Astronomical Union