HD 66141 b - Giant planet orbiting evolved K type star

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HD 66141 b - Giant planet orbiting evolved K type star

Post by Sirius_Alpha on 11th November 2012, 9:26 pm

Detection of an exoplanet around the evolved K giant HD 66141
http://arxiv.org/abs/1211.2054

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.

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Re: HD 66141 b - Giant planet orbiting evolved K type star

Post by Edasich on 12th November 2012, 5:07 am

The first extrasolar planet candidate in Canis Minor... Smile
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Re: HD 66141 b - Giant planet orbiting evolved K type star

Post by Lazarus on 12th November 2012, 1:55 pm

Really? Which constellations are left?
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Re: HD 66141 b - Giant planet orbiting evolved K type star

Post by Edasich on 12th November 2012, 4:16 pm

Lazarus wrote:Really? Which constellations are left?

Telescopium and Caelum for sure. Smile
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Re: HD 66141 b - Giant planet orbiting evolved K type star

Post by Sirius_Alpha on 12th November 2012, 4:31 pm

Edasich wrote:
Lazarus wrote:Really? Which constellations are left?

Telescopium and Caelum for sure. Smile
RR Cae?

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Re: HD 66141 b - Giant planet orbiting evolved K type star

Post by Edasich on 13th November 2012, 4:55 am

Right. I've forgot that one. So Telescopium is left.
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Re: HD 66141 b - Giant planet orbiting evolved K type star

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