Access to Astronomical Catalogues

← Click to display the menu
J/A+A/529/A134      Velocity curve of α Arietis          (Lee+, 2011)

A likely exoplanet orbiting the oscillating K-giant alpha Arietis. Lee B.-C., Mkrtichian D.E., Han I., Kim K.-M., Park M.-G. <Astron. Astrophys. 529, A134 (2011)> =2011A&A...529A.134L
ADC_Keywords: Stars, double and multiple ; Stars, giant ; Planets ; Radial velocities Keywords: planetary systems - stars: individual: alpha Arietis - technique: radial velocity Abstract: To search for extra-solar planets around intermediate mass stars, we are conducting a precise RV survey around K-giants. We present high-accuracy RV measurements of alpha Ari from November 2003 to February 2010. This star belongs to our sample of 55 K-giants studied for extra-solar planet and pulsation searches using the fiber-fed Bohyunsan Observatory Echelle Spectrograph (BOES) attached to the 1.8-m telescope at Bohyunsan Optical Astronomy Observatory (BOAO) in Korea. We find a planetary companion with a long-period and low-amplitude radial velocity (RV) variations in oscillating K2 III star alpha Ari (HD 12929). We do not find the correlation between RV variations and chromospheric activity indicators (CaII H & K region, Hα line). The bisector analysis also shows that bisector velocity span (BVS) does not show any obvious correlation with RV variation but has periodic component that may be attributed to the rotation of the star. If the RV variation is indeed caused by a planetary companion, an orbital solution with a period of P=381-days, a semi-amplitude of K=41m/s, and an eccentricity of e=0.25 fits the data best. Assuming a possible stellar mass of Mstar=1.5M, we estimate the minimum mass for the planetary companion of m2sini=1.8M with an orbital semi-major axis of 1.2AU. Our finding of a likely exoplanet in alpha Ari gives a support to search for extra-solar planets around giant stars with multi-periodic oscillations. Description: The RV measurements obtained from November 2003 until February 2010. Objects: -------------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------------- 02 07 10.4 +23 27 45 alpha Ari = HD 12929 -------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 25 678 Radial velocity of alpha Ari
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- 20 F5.1 m/s RV Radial velocity 22- 25 F4.1 m/s e_RV Standard error of RV
Acknowledgements: Byeng-Cheol Lee, bclee(at)
(End) Byeong-Cheol Lee [KASI, Korea], Patricia Vannier [CDS] 11-Mar-2011
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service