Exoplanets around G-K Giants

Details Exoplanets around G-K Giants Exoplanets around G-K Giants

2011-02-02

arxiv.org/abs/1102.0499v1

AIP Conference Proceedings, Volume 1331, pp. 79-87 (2011)

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

Part of PlanetsbeyondMS/2010 proceedings http://arxiv.org/html/1011.6606

Scientific paper

10.1063/1.3571003

G and K giants are a class of radial velocity (RV) variables. One reason for this variability are planetary companions which are indicated in time series of stellar spectra. Since 2004 these spectra in the visual range were obtained with the high resolution coud\'e \'echelle spectrograph mounted on the 2m telescope of the Th\"uringer Landessternwarte Tautenburg (TLS) for a northern sample of 62 very bright K giants. In the South around 300 G and K giants were observed with HARPS mounted on the 3.6m telescope on La Silla. The TLS sample contains at least 11 stars (18 %) which show low-amplitude, long-period RV variations most likely due to planets. This percentage of planet frequency is confirmed by preliminary results of the HARPS study. Moreover the TLS survey seems to indicate that giant planets do not favour metal-rich stars, are more massive, and have longer periods than those found around solar-type host stars.

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