2011A&A...529A.134L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST02:35:39

2011A&A...529A.134L - Astronomy and Astrophysics, volume 529A, 134-134 (2011/5-1)

A likely exoplanet orbiting the oscillating K-giant α Arietis.

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

Abstract (from CDS):

To search for extrasolar planets around intermediate-mass stars, we are conducting a precise RV survey around K-giants. We present high-accuracy RV measurements of α Ari made from November 2003 to February 2010. This star belongs to our sample of 55 K-giants studied for extrasolar 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 long-period and low-amplitude radial velocity (RV) variations in oscillating K2 III star α 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 the 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=381days, a semi-amplitude of K=41m/s, and an eccentricity of e=0.25 fits the data best. Assuming a possible stellar mass of M*=1.5M, we estimate the minimum mass for the planetary companion of m2 sini=1.8MJup with an orbital semi-major axis of 1.2AU. Our finding of a likely exoplanet in α Ari supports searching for extrasolar planets around giant stars with multiperiodic oscillations.

Abstract Copyright:

Journal keyword(s): planetary systems - stars: individual: α Arietis - techniques: radial velocities

VizieR on-line data: <Available at CDS (J/A+A/529/A134): table1.dat>

Simbad objects: 11

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Number of rows : 11

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 1091 1
2 * alf Ari b Pl 02 07 10.40570 +23 27 44.7032           ~ 7 1
3 * alf Ari PM* 02 07 10.40570 +23 27 44.7032 4.29 3.17 2.01 1.15 0.54 K2-IIIbCa-1 604 1
4 HD 13189 * 02 09 40.1721335781 +32 18 59.160743793   9.04 7.56     K1II-III 67 1
5 HD 47536 PM* 06 37 47.6183014773 -32 20 23.033515609   6.43 5.258     K1III 90 1
6 * bet Gem PM* 07 45 18.94987 +28 01 34.3160 3.00 2.14 1.14 0.39 -0.11 K0IIIb 1046 1
7 * pi.02 UMa PM* 08 40 12.8204103814 +64 19 40.573003186 6.94 5.78 4.61 3.72 3.09 K1+III 146 1
8 * gam01 Leo PM* 10 19 58.354462 +19 50 29.35920 4.13 3.13 1.98 1.13 0.51 K1-IIIFe-1 268 1
9 * chi Vir ** 12 39 14.7669232892 -07 59 44.041075962   5.886 4.643 6.45   K2+IIICN0.5 132 1
10 * iot Dra V* 15 24 55.7746265 +58 57 57.834445 5.68 4.45 3.29 2.51 1.91 K2III 368 1
11 * 42 Dra PM* 18 25 59.1383795957 +65 33 48.503958394   6.005 4.823     K1.5IIIFe-1 134 1

    Equat.    Gal    SGal    Ecl

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2020.07.04-02:35:39

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