Astronomy and Astrophysics – Astrophysics – Earth and Planetary Astrophysics
Scientific paper
2009-08-12
Astronomy and Astrophysics
Astrophysics
Earth and Planetary Astrophysics
11 pages, 16 figures
Scientific paper
11 UMi and HD 32518 belong to a sample of 62 K giant stars that has been observed since February 2004 using the 2m Alfred Jensch telescope of the Th\"uringer Landessternwarte (TLS) to measure precise radial velocities (RVs). The aim of this survey is to investigate the dependence of planet formation on the mass of the host star by searching for planetary companions around intermediate-mass giants. An iodine absorption cell was used to obtain accurate RVs for this study. Our measurements reveal that the RVs of 11 UMi show a periodic variation of 516.22 days. The RV curve of HD 32518 shows sinusoidal variations with a period of 157.54 days. The HIPPARCOS photometry as well as our H\alpha core flux measurements reveal no variability with the RV period. Thus, Keplerian motion is the most likely explanation for the observed RV variations for both giant stars. An exoplanet with a minimum mass of 10.5 Jupiter masses orbits the K giant 11 UMi. The K1 III giant HD 32518 hosts a planetary companion with a minimum mass of 3.0 Jupiter masses in a nearly circular orbit. These are the 4th and 5th planets published from this TLS survey.
Döllinger M. P.
Guenther Eike W.
Hartmann Markus
Hatzes Artie P.
Pasquini Luca
No associations
LandOfFree
Planetary companions around the K giant stars 11 UMi and HD 32518 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Planetary companions around the K giant stars 11 UMi and HD 32518, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Planetary companions around the K giant stars 11 UMi and HD 32518 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-371124