2010A&A...509A.103S


Query : 2010A&A...509A.103S

2010A&A...509A.103S - Astronomy and Astrophysics, volume 509, A103-103 (2010/1-1)

Hipparcos preliminary astrometric masses for the two close-in companions to HD 131664 and HD 43848. A brown dwarf and a low-mass star.

SOZZETTI A. and DESIDERA S.

Abstract (from CDS):

Several mechanisms for forming brown dwarfs have been proposed, which today are not believed to be mutually exclusive. Among the fundamental characteristics of brown dwarfs that are intrinsically tied to their origins, multiplicity is particularly relevant. Any successful determination of the actual mass for such objects in any systems is thus worthwhile, as it allows one to improve on the characterization of the multiplicity properties (e.g., frequency, separation, mass-ratio distribution) of sub-stellar companions. We attempt to place better constraints on the masses of two Doppler-detected substellar companions to the nearby G dwarfs HD 131664 and HD 43848. We carried out orbital fits to the Hipparcos Intermediate Astrometric Data (IAD) for the two stars, taking advantage of the knowledge of the spectroscopic orbits, and solving for the inclination angle i and the longitude of the ascending node Ω, the two orbital elements that can be determined in principle solely by astrometry, A number of checks were carried out to assess the reliability of the orbital solutions thus obtained. The best-fit solution for HD 131664 yields i=55±33deg and Ω=22±28deg. The resulting inferred true companion mass is then Mc=23–5+26MJ. For HD 43848, we find i=12±7deg and Ω=288±22deg, and a corresponding Mc=120–43+167MJ. Based on the statistical evidence from an F-test, the study of the joint confidence intervals of variation in i and Ω and the comparison of the derived orbital semi-major axes with a distribution of false astrometric orbits obtained for single stars observed by Hipparcos, the astrometric signal of the two companions to HD 131664 and HD 43848 is then considered detected in the Hipparcos IAD, with a level of statistical confidence not exceeding 95%. We constrain the true mass of HD 131664b to that of a brown dwarf to within a somewhat statistically significant degree of confidence (∼2-σ). For HD 43848b, a true mass in the brown dwarf regime is ruled out at the 1-σ confidence level. The results are discussed in the context of the properties of the (few) close substellar and massive planetary companions to nearby solar-type stars and their implications for proposed models of formation and structure of massive planets and brown dwarfs.

Abstract Copyright:

Journal keyword(s): stars: individual: HD 131664, HD 43848 - stars: low-mass - stars: brown dwarfs - planetary systems - astrometry - methods: data analysis

Simbad objects: 63

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Number of rows : 63
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 4747 SB* 00 49 26.7612113944 -23 12 44.865754071 8.244 7.927 7.155 6.732 6.344 G8/K0V 143 0
2 HD 13507b BD? 02 12 55.0057 +40 40 06.023           ~ 7 1
3 HD 16760b Pl 02 42 21.3071467622 +38 37 07.139224707           ~ 21 1
4 HD 17156 PM* 02 49 44.4866941172 +71 45 11.632197644   8.78 8.16     F9V 153 2
5 HD 18455B * 02 57 14.679308 -24 58 09.37741   9.22 8.20     G5 13 0
6 BD-04 782 SB* 04 15 09.5344264586 -04 25 06.381142715 11.755 10.561 9.332 8.591 7.953 K5V 54 0
7 BD+57 793b Pl 04 21 52.7044170433 +57 49 01.892074012           ~ 184 1
8 BD+57 793 * 04 21 52.7044170433 +57 49 01.892074012   10.27 9.85     F5V 135 2
9 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2810 0
10 HD 283750b Pl? 04 36 48.2413370074 +27 07 55.898311812           ~ 9 0
11 HD 29587b BD? 04 41 36.3177 +42 07 06.493           ~ 9 1
12 HD 30339 SB* 04 49 33.3466303670 +53 21 56.557063995   8.80 8.21     F8 48 0
13 HD 33636 Pe* 05 11 46.4489745849 +04 24 12.759759957   7.64   6.6   G0V_CH-0.3 173 1
14 HD 33636b * 05 11 46.4490 +04 24 12.742           M6V 43 1
15 * pi. Men b Pl 05 37 09.8851202601 -80 28 08.831347245           ~ 58 1
16 HD 38529c Pl 05 46 34.9129896843 +01 10 05.512540812           ~ 68 1
17 HD 38529 PM* 05 46 34.9129896843 +01 10 05.512540812       5.4   G8III/IV 324 2
18 HD 41004Bb Pl 05 59 49.6473573887 -48 14 22.805780232           ~ 26 1
19 HD 43848 PM* 06 16 31.3569620776 -40 31 54.785883417   9.57 8.64     K2IV 36 1
20 HD 43848b Pl 06 16 31.3569620776 -40 31 54.785883417           ~ 9 1
21 HD 44627 Ro* 06 19 12.9129838711 -58 03 15.524890610   10.01 9.205   8.185 K1V(e) 152 1
22 CoRoT-1 * 06 48 19.1724141241 -03 06 07.710423478     13.6 13.44 12.88 G0V 109 2
23 HD 65430 SB* 07 59 33.9366319995 +20 50 38.194256358 9.004 8.494 7.649 7.195 6.776 K0V 104 1
24 HAT-P-13c Pl 08 39 31.8073600797 +47 21 07.275628863           ~ 48 1
25 HAT-P-13 * 08 39 31.8073600797 +47 21 07.275628863   11.15 10.42 10.40   G4 119 2
26 HD 80606 PM* 09 22 37.5769478105 +50 36 13.434928660   9.78 9.00     G8V 296 2
27 BD+20 2457 * 10 16 44.8671846183 +19 53 29.010025880   10.99 9.74     K2 53 1
28 HD 89707 SB* 10 20 49.9820182134 -15 28 47.680757393   7.74 7.19     G2VFe-1.5CH-0.8 128 0
29 HD 91669B BD? 10 34 54.43 -13 47 16.6           ~ 4 0
30 * ksi UMa B SB* 11 18 10.8360115405 +31 31 44.821690914   5.41 4.77 4.4   G2V 331 1
31 * ksi UMa Bb BD? 11 18 10.92 +31 31 45.1           ~ 14 1
32 HD 110833 SB* 12 44 14.5447567445 +51 45 33.372388151   7.98   6.4   K3 152 0
33 HD 112758 SB* 12 59 01.5631121408 -09 50 02.648158707 8.737 8.384 7.588 7.163 6.729 G9V 171 1
34 TYC 2534-698-1 PM* 13 03 22.0020554488 +35 05 25.384291166   11.40 10.70     G2V 7 2
35 HD 114762b Pl 13 12 19.7467346230 +17 31 01.611425890           ~ 124 1
36 HD 127506b Pl? 14 30 44.9753771297 +35 27 13.432952502           ~ 3 0
37 BD+22 2716b Pl 14 33 06.3573673505 +21 53 40.982782397           ~ 137 1
38 BD+22 2716 * 14 33 06.3573673505 +21 53 40.982782397   10.194 9.745     F5V 84 1
39 1RXS J150003.3-733128 X 15 00 03.3 -73 31 28           ~ 1 0
40 HD 131664b Pl 15 00 06.0799727760 -73 32 07.226474399           ~ 18 1
41 HD 131664 * 15 00 06.0799727760 -73 32 07.226474399   8.82 8.13     G3V 62 1
42 HD 136118b Pl? 15 18 55.4730161019 -01 35 32.597619958           ~ 33 1
43 HD 137510 PM* 15 25 53.2707121018 +19 28 50.529629119   6.872 6.241     G0IV-V 103 0
44 HD 140913 SB* 15 45 07.4493001052 +28 28 11.743016199   8.664 8.053     G0V 93 0
45 CD-27 10695 * 15 59 50.9489706053 -28 03 42.309432433   11.83 11.59 11.31 10.92 F4 97 1
46 HD 147506 * 16 20 36.3579144486 +41 02 53.109043943   9.15 8.69     F8V 147 2
47 HD 147506b Pl 16 20 36.3579144486 +41 02 53.109043943           ~ 224 1
48 HD 156846b Pl 17 20 34.3109259866 -19 20 01.494393975           ~ 22 1
49 HD 162020b Pl 17 50 38.3545681675 -40 19 06.080050505           ~ 53 1
50 LTT 7173 PM* 18 04 41.0738321398 -59 12 08.095034271       12.12 10.20 ~ 7 0
51 HD 167665 PM* 18 17 23.7584695845 -28 17 20.201725932   6.94 6.40     F9VFe-0.8CH-0.4 94 1
52 HD 168443 PM* 18 20 03.9331764016 -09 35 44.609316076   7.62 6.92     G6V 292 1
53 HD 168443c Pl 18 20 03.9331764016 -09 35 44.609316076           ~ 87 1
54 HD 169889 SB* 18 26 21.9377627808 +08 36 56.772904111   9.02   7.8   K0 69 0
55 HD 174457 SB* 18 50 02.0627482461 +15 18 41.424232657       7.2   F8 50 0
56 CoRoT-3 EB* 19 28 13.2642482783 +00 07 18.614302248   14.199 13.292 13.099 12.54 F3V 70 1
57 CoRoT-3b Pl 19 28 13.2642482783 +00 07 18.614302248           ~ 123 1
58 BD+47 2846 Er* 19 28 59.3538131541 +47 58 10.216250846   10.97 10.48     F6V 271 2
59 HD 184860b Pl? 19 36 45.63937 -10 26 36.3596           ~ 4 1
60 HD 191760b Pl? 20 13 26.7453265517 -46 12 03.702248782           ~ 2 1
61 HD 202206b Pl 21 14 57.7684954746 -20 47 21.162361638           ~ 54 1
62 HD 202206 PM* 21 14 57.7684954746 -20 47 21.162361638   8.79 8.07     G6V 204 1
63 HD 217580 SB* 23 01 51.5437938421 -03 50 55.441795620 9.199 8.428 7.464 6.934 6.482 K3V 94 0

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2021.12.08-03:05:18

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