2007ApJ...665..785J


Query : 2007ApJ...665..785J

2007ApJ...665..785J - Astrophys. J., 665, 785-793 (2007/August-2)

Retired A stars and their companions: exoplanets orbiting three intermediate-mass subgiants.

JOHNSON J.A., FISCHER D.A., MARCY G.W., WRIGHT J.T., DRISCOLL P., BUTLER R.P., HEKKER S., REFFERT S. and VOGT S.S.

Abstract (from CDS):

We report precision Doppler measurements of three intermediate-mass subgiants obtained at Lick and Keck Observatories. All three stars show variability in their radial velocities consistent with planet-mass companions in Keplerian orbits. We find a planet with a minimum mass MPsini=2.5 MJ in a 351.5 day orbit around HD 192699, a planet with a minimum mass of 2.0 MJ in a 341.1 day orbit around HD 210702, and a planet with a minimum mass of 0.61 MJ in a 297.3 day orbit around HD 175541. Mass estimates from stellar interior models indicate that all three stars were formerly A-type, main-sequence dwarfs with masses ranging from 1.65 to 1.85 M☉. These three long-period planets would not have been detectable during their stars' main-sequence phases due to the large rotational velocities and stellar jitter exhibited by early-type dwarfs. There are now nine ``retired'' (evolved) A-type stars (M*>1.6 M☉) with known planets. All nine planets orbit at distances a≥0.78 AU, which is significantly different from the semimajor axis distribution of planets around lower mass stars.

Abstract Copyright: ∼

Journal keyword(s): Stars: Planetary Systems: Formation - stars: individual (HD 192699) - stars: individual (HD 210702) - stars: individual (HD 175541) - Techniques: Radial Velocities

Simbad objects: 25

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Number of rows : 25
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026
#notes
1 * eta02 Hyi b Pl 01 54 56.1314447592 -67 38 50.291415024           ~ 23 1
2 * eta02 Hyi PM* 01 54 56.1314447592 -67 38 50.291415024   5.623 4.685     G8IIIb 129 1
3 HD 13189 * 02 09 40.1723129208 +32 18 59.160568824   9.04 7.55     K1II-III 88 1
4 HD 13189b Pl 02 09 40.1723129208 +32 18 59.160568824           ~ 23 1
5 * eps Tau b Pl 04 28 37.0002551195 +19 10 49.563140930           ~ 30 1
6 * eps Tau ** 04 28 37.0002551195 +19 10 49.563140930 5.42 4.54 3.53     G9.5IIICN0.5 628 1
7 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 2087 1
8 HD 47536 PM* 06 37 47.6181076691 -32 20 23.040481884   6.43 5.258     K1III 119 1
9 * bet Gem PM* 07 45 18.94987 +28 01 34.3160 3.00 2.14 1.14 0.39 -0.11 K0IIIb 1150 2
10 * bet Gem b Pl 07 45 18.94987 +28 01 34.3160           ~ 37 1
11 HD 89744 PM* 10 22 10.5618854376 +41 13 46.309698444   6.25 5.72     F7V 360 1
12 HD 89744b Pl 10 22 10.5618854376 +41 13 46.309698444           ~ 60 1
13 HD 104985 HB* 12 05 15.1171894272 +76 54 20.642733144       5.2   G8.5IIIb 172 1
14 HD 104985b Pl 12 05 15.1171894272 +76 54 20.642733144           ~ 31 1
15 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0V 2787 1
16 HD 175541 PM* 18 55 40.8841512864 +04 15 55.165056048   8.90 8.00     G6/8IV 129 1
17 HD 175541b Pl 18 55 40.8841512864 +04 15 55.165056048           ~ 21 1
18 * 59 Dra PM* 19 09 09.8814606288 +76 33 37.813819608   5.400 5.107     A7V 138 1
19 HD 185269 PM* 19 37 11.7411563088 +28 29 59.507007072   7.266 6.669 7.46   G2V 121 1
20 HD 192699 PM* 20 16 06.0037761192 +04 34 50.859975612   7.314 6.446     G8IV 75 1
21 HD 192699b Pl 20 16 06.0037761192 +04 34 50.859975612           ~ 19 1
22 HD 210702b Pl 22 11 51.3309460896 +16 02 25.997965476           ~ 22 1
23 HD 210702 * 22 11 51.3309460896 +16 02 25.997965476   6.896 5.930     K0III 111 1
24 * alf PsA PM* 22 57 39.04625 -29 37 20.0533 1.31 1.25 1.16 1.11 1.09 A4V 1303 3
25 * gam Cep SB* 23 39 20.9104133784 +77 37 56.510781384 5.190 4.250   2.6   K1III-IVCN1 626 1

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