2009A&A...499..935D


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST22:02:33

2009A&A...499..935D - Astronomy and Astrophysics, volume 499, 935-942 (2009/6-1)

Planetary companion candidates around the K giant stars 42 Draconis and HD 139357.

DOELLINGER M.P., HATZES A.P., PASQUINI L., GUENTHER E.W., HARTMANN M. and GIRARDI L.

Abstract (from CDS):

For the past 3 years we have been monitoring 62 K giant stars using precise stellar radial velocity (RV) measurements with the 2m Alfred Jensch Telescope of the Thueringer Landessternwarte Tautenburg (TLS). To probe the dependence of planet formation on stellar mass by finding planets around intermediate-mass giant stars. We present high accuracy RV measurements of the K1.5 III star 42 Dra and the K4 III star HD 139357. The wavelength reference for the RV measurements was provided by an iodine absorption cell placed in the optical path of the spectrograph. Our measurements reveal that the time series of the radial velocity of 42 Dra shows a periodic variation of 479.1 days with a semiamplitude of K=112.5m/s. An orbital solution yields a mass function of f(m)=(5.29±0.62)x10–8 solar masses (M) and an eccentricity of e=0.38±0.06. From our template spectra, taken without the iodine cell, we determine a metallicity of -0.46±0.04 dex and a stellar mass of 0.98±0.06M for this star. HD 139357 shows periodic RV variations of 1125.7 days with a semiamplitude K=159.9m/s. An orbital solution yields an eccentricity, e=0.10±0.02 and mass function, f(m)=(4.79±0.57)x10–7M. An iron abundance of -0.13±0.04dex is obtained, and a stellar mass of 1.31±0.24M for the parent star is derived. An analysis of the HIPPARCOS photometry as well as our Hα core flux measurements reveal no variability with the radial velocity period. Keplerian motion is the most likely explanation for the observed radial velocity variations for these stars. The K giant stars 42 Dra and HD 139357 host extrasolar planets with ``minimum masses'' of 3.88±0.85 Jupiter masses MJup and 9.76±2.15MJup, respectively.

Abstract Copyright:

Journal keyword(s): stars: general - stars: variables: general - stars: individual: 42 Dra - stars: individual: HD 139357 - stars: planetary systems - techniques: radial velocities - stars: late-type

VizieR on-line data: <Available at CDS (J/A+A/499/935): table2.dat table5.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 HD 13189 * 02 09 40.1721335781 +32 18 59.160743793   9.04 7.56     K1II-III 67 1
2 HD 47536 PM* 06 37 47.6183014773 -32 20 23.033515609   6.43 5.258     K1III 90 1
3 * bet Gem PM* 07 45 18.94987 +28 01 34.3160 3.00 2.14 1.14 0.39 -0.11 K0IIIb 1046 1
4 * iot Dra V* 15 24 55.7746265 +58 57 57.834445 5.68 4.45 3.29 2.51 1.91 K2III 368 1
5 * iot Dra b Pl 15 24 55.7746648829 +58 57 57.818217848           ~ 39 1
6 HD 139357 * 15 35 16.1984597370 +53 55 19.714695899   7.160 5.964     K4III: 42 1
7 HD 139357b Pl 15 35 16.1984597370 +53 55 19.714695899           ~ 7 1
8 HD 155358 PM* 17 09 34.6179324422 +33 21 21.086408841       7.0   G0 133 1
9 * 42 Dra b Pl 18 25 59.1383795957 +65 33 48.503958394           ~ 12 1
10 * 42 Dra PM* 18 25 59.1383795957 +65 33 48.503958394   6.005 4.823     K1.5IIIFe-1 134 1
11 * 74 Dra PM* 20 29 27.5627153292 +81 05 28.590552003   6.88   5.4   K0II 51 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-22:02:33

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