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A HET search for planets around evolved stars

Published online by Cambridge University Press:  01 October 2007

Andrzej Niedzielski  and
Alex Wolszczan
Andrzej Niedzielski
Affiliation:
Toruń Centre for Astronomy, Nicolaus Copernicus UniversityGagarina 11, 87-100 Toruń, Poland Dept. of Astronomy & Astrophysics, The Pennsylvania State University, 525 Davey Laboratory, University Park, 16802 PA, USA
Alex Wolszczan
Affiliation:
Toruń Centre for Astronomy, Nicolaus Copernicus UniversityGagarina 11, 87-100 Toruń, Poland Dept. of Astronomy & Astrophysics, The Pennsylvania State University, 525 Davey Laboratory, University Park, 16802 PA, USA
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Abstract

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We present our ongoing survey of ∼1000 GK-giants with the 9.2-m Hobby-Eberly Telescope in search for planets around evolved stars. The stars selected for this survey are brighter than 11 mag and are located in the section of the HR-diagram, which is approximately delimited by the main sequence, the instability strip, and the coronal dividing line. We use the High Resolution Spectrograph to obtain stellar spectra for radial velocity measurements with a 4-6 m s−1 precision. So far, the survey has discovered a planetary-mass companion to the K0-giant HD 17092, and it has produced a number of plausible planet candidates around other stars. Together with other similar efforts, our program provides information on planet formation around intermediate mass main sequence-progenitors and it will create the experimental basis with which to study dynamics of planetary systems around evolving stars.

Keywords

Extrasolar planetsred giantsradial velocity
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S249: Exoplanets: Detection, Formation and Dynamics , October 2007 , pp. 43 - 47
Copyright
Copyright © International Astronomical Union 2008

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