2006A&A...449..699R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.09CEST17:07:32

2006A&A...449..699R - Astronomy and Astrophysics, volume 449, 699-702 (2006/4-2)

Hipparcos astrometric orbits for two brown dwarf companions: HD 38529 and HD 168443.

REFFERT S. and QUIRRENBACH A.

Abstract (from CDS):

HD 38529 and HD 168443 have previously been identified as systems with two substellar companion candidates using precise radial velocity measurements. We want to further constrain their orbits and the nature of the outer companions. We fit astrometric orbits of the outer substellar companions in the two systems to the Hipparcos Intermediate Astrometric Data. The fit constrains all possible solutions to a small region in the parameter space of the two missing orbital parameters (inclination i and ascending node Ω). This can be interpreted as a possible real detection of the astrometric signatures of the companions in the Hipparcos data, although there is still a 14-18% chance that the signal is not detectable in the data, according to an F-test. However, even in the case of a non-detection of the companion signal in the astrometric data, the knowledge of the spectroscopic orbital parameters enables us to place tight constraints on these two missing parameters, so that the astrometric orbit is fully determined (with confidence levels of around 80% for HD 38529, 95% for HD 168443). Inclinations derived from these astrometric fits enable us to calculate masses for the substellar companions rather than lower or upper limits. The best fit solution for HD 38529, (i, Ω)=(160°, 52°), yields a mass of 37+36–19MJup for the outer companion. For HD 168443, we derive best fit parameters of (i, Ω)=(150°, 19°), which imply a companion mass of 34±12MJup. The outer companions in both systems are thus brown dwarfs.

Abstract Copyright:

Journal keyword(s): stars: individual: HD 38529, HD 168443 - stars: low-mass, brown dwarfs - planetary systems - astrometry

Simbad objects: 14

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Number of rows : 14

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 38529b Pl 05 46 34.9129896843 +01 10 05.512540812           ~ 76 1
2 HD 38529c Pl 05 46 34.9129896843 +01 10 05.512540812           ~ 64 1
3 HD 38529 PM* 05 46 34.9129896843 +01 10 05.512540812       5.4   G8III/IV 308 2
4 * 47 UMa PM* 10 59 27.9738644892 +40 25 48.922388918   5.66   4.7   G1-VFe-0.5 712 1
5 * 70 Vir PM* 13 28 25.8081883620 +13 46 43.642951116 5.930 5.680 4.970 4.37 3.98 G4Va 670 1
6 * iot Dra V* 15 24 55.7746265 +58 57 57.834445 5.68 4.45 3.29 2.51 1.91 K2III 368 1
7 HD 149026 PM* 16 30 29.6184841164 +38 20 50.310893575   8.75 8.14     G0IV 195 1
8 HD 168443 PM* 18 20 03.9331764016 -09 35 44.609316076   7.62 6.92     G6V 278 1
9 HD 168443b Pl 18 20 03.9331764016 -09 35 44.609316076           ~ 89 1
10 HD 168443c Pl 18 20 03.9331764016 -09 35 44.609316076           ~ 85 1
11 HD 209458 V* 22 03 10.7729598762 +18 53 03.548248479   8.21 7.63     F9V 994 1
12 BD-15 6290 BY* 22 53 16.7323107416 -14 15 49.303409936 12.928 11.749 10.192 9.013 7.462 M3.5V 856 1
13 BD-15 6290b Pl 22 53 16.7323107416 -14 15 49.303409936           ~ 219 1
14 * 51 Peg Ro* 22 57 27.9804167474 +20 46 07.782240714 6.39 6.16 5.46 4.97 4.61 G2IV 1071 1

    Equat.    Gal    SGal    Ecl

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2020.07.09-17:07:32

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