Sirius_Alpha Admin
Number of posts : 4320 Location : Earth Registration date : 2008-04-06
| Subject: HD 66141 b - Giant planet orbiting evolved K type star 11th November 2012, 9:26 pm | |
| Detection of an exoplanet around the evolved K giant HD 66141 http://arxiv.org/abs/1211.2054 - Quote :
- Aims. We have been carrying out a precise radial velocity (RV) survey for K giants to search for and study the origin of the lowamplitude and long-periodic RV variations.
Methods. We present high-resolution RV measurements of the K2 giant HD 66141 from December 2003 to January 2011 using the fiber-fed Bohyunsan Observatory Echelle Spectrograph (BOES) at Bohyunsan Optical Astronomy Observatory (BOAO). Results. We find that the RV measurements for HD 66141 exhibit a periodic variation of 480.5 +/- 0.5 days with a semi-amplitude of 146.2 +/- 2.7 m/s. The Hipparcos photometry and bisector velocity span (BVS) do not show any obvious correlations with RV variations. We find indeed 706.4 +/- 35.0 day variations in equivalent width (EW) measurements of H_alpha line and 703.0 +/- 39.4 day variations in a space-born measurements 1.25{\mu} flux of HD 66141 measured during COBE/DIRBE experiment. We reveal that a mean value of long-period variations is about 705 +/- 53 days and the origin is a rotation period of the star and variability that is caused by surface inhomogeneities. For the 480 day periods of RV variations an orbital motion is the most likely explanation. Assuming a stellar mass of 1.1 +/- 0.1 M_Sun? for HD 66141, we obtain a minimum mass for the planetary companion of 6.0 +/- 0.3 M_Jup with an orbital semi-major axis of 1.2 +/- 0.1 AU and an eccentricity of 0.07 +/- 0.03. _________________ Caps Lock: Cruise control for 'Cool'!
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Edasich dK star
Number of posts : 2292 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: HD 66141 b - Giant planet orbiting evolved K type star 12th November 2012, 5:07 am | |
| The first extrasolar planet candidate in Canis Minor... | |
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Lazarus dF star
Number of posts : 3337 Registration date : 2008-06-12
| Subject: Re: HD 66141 b - Giant planet orbiting evolved K type star 12th November 2012, 1:55 pm | |
| Really? Which constellations are left? | |
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Edasich dK star
Number of posts : 2292 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: HD 66141 b - Giant planet orbiting evolved K type star 12th November 2012, 4:16 pm | |
| - Lazarus wrote:
- Really? Which constellations are left?
Telescopium and Caelum for sure. | |
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Sirius_Alpha Admin
Number of posts : 4320 Location : Earth Registration date : 2008-04-06
| Subject: Re: HD 66141 b - Giant planet orbiting evolved K type star 12th November 2012, 4:31 pm | |
| - Edasich wrote:
- Lazarus wrote:
- Really? Which constellations are left?
Telescopium and Caelum for sure. RR Cae? _________________ Caps Lock: Cruise control for 'Cool'!
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Edasich dK star
Number of posts : 2292 Location : Tau Ceti g - Mid Latitudes Registration date : 2008-06-02
| Subject: Re: HD 66141 b - Giant planet orbiting evolved K type star 13th November 2012, 4:55 am | |
| Right. I've forgot that one. So Telescopium is left. | |
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| Subject: Re: HD 66141 b - Giant planet orbiting evolved K type star | |
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