J/A+A/546/A5 eps CrB radial velocity curve (Lee+, 2012)
A planetary companion around the K giant eps Corona Borealis.
Lee B.-C., Han I., Park M.-G., Mkrtichian D.E., Kim K.-M.
<Astron. Astrophys. 546, A5 (2012)>
=2012A&A...546A...5L 2012A&A...546A...5L
ADC_Keywords: Stars, double and multiple ; Planets ; Radial velocities
Keywords: stars: planetary systems - stars: individual: HD 143107 -
technique: radial velocities
Abstract:
Our aim is to search for and study the origin of the low-amplitude and
long-periodic radial velocity (RV) variations in K giants.
We present high-resolution RV measurements of K2 giant epsilon CrB
from February 2005 to January 2012 using the fiber-fed Bohyunsan
Observatory Echelle Spectrograph (BOES) at the Bohyunsan Optical
Astronomy Observatory (BOAO).
We find that the RV measurements for epsilon CrB exhibit a periodic
variation of 417.9±0.5days with a semi-amplitude of 129.4±2.0m/s.
There is no correlation between RV measurements and chromospheric
activity in the Ca II H region, the Hipparcos photometry, or bisector
velocity span.
Keplerian motion is the most likely explanation, with the RV
variations arising from an orbital motion. Assuming a possible stellar
mass of 1.7±0.1M☉ for epsilon CrB, we obtain a minimum mass
for the planetary companion of 6.7±0.3MJup with an orbital
semi-major axis of 1.3AU and eccentricity of 0.11. We also discuss
the implications of our observations for stellar metallicity versus
planet occurrence rate and stellar mass versus planetary mass
relations.
Description:
RV measurements obtained from February 2005 until January 2012.
Objects:
--------------------------------------------------
RA (2000) DE Designation(s)
--------------------------------------------------
15 57 35.25 +26 52 40.4 HD 143107 = * eps CrB
--------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 26 52 Radial velocity of eps Corona Borealis
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 F14.6 --- HJD Heliocentric Julian date of the observation
16- 21 F6.1 m/s RV Radial velocity
23- 26 F4.1 m/s e_RV Standard error of RV
--------------------------------------------------------------------------------
Acknowledgements:
Byeng-Cheol Lee, bclee(at)kasi.re.kr
(End) Byeong-Cheol Lee [KASI, Korea], Patricia Vannier [CDS] 06-Sep-2012