2012A&A...546A...5L


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.12CET12:53:13

2012A&A...546A...5L - Astronomy and Astrophysics, volume 546A, 5-5 (2012/10-1)

A planetary companion around the K giant ε Corona Borealis.

LEE B.-C., HAN I., PARK M.-G., MKRTICHIAN D.E. and KIM K.-M.

Abstract (from CDS):

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 ε 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 ε CrB exhibit a periodic variation of 417.9±0.5-days with a semi-amplitude of 129.4±2.0m/s. There is no correlation between RV measurements and chromospheric activity in the CaII 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 ε 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.

Abstract Copyright:

Journal keyword(s): planetary systems - stars: individual: HD 143107 - techniques: radial velocities

VizieR on-line data: <Available at CDS (J/A+A/546/A5): table1.dat>

Simbad objects: 4

goto Full paper

goto View the reference in ADS

Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * tau Cet PM* 01 44 04.0834226 -15 56 14.926552 4.43 4.22 3.50 2.88 2.41 G8V 1069 1
2 * iot Dra V* 15 24 55.7746265 +58 57 57.834445 5.68 4.45 3.29 2.51 1.91 K2III 367 1
3 * eps CrB b Pl 15 57 35.2505542411 +26 52 40.343304564           ~ 2 1
4 * eps CrB PM* 15 57 35.2514673 +26 52 40.363564 6.650 5.360 4.130 3.27 2.64 K2IIIab 241 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2012A&A...546A...5L and select 'bookmark this link' or equivalent in the popup menu


2019.12.12-12:53:13

© Université de Strasbourg/CNRS

    • Contact