2010AJ....139.1844B


Query : 2010AJ....139.1844B

2010AJ....139.1844B - Astron. J., 139, 1844-1856 (2010/May-0)

The mass of HD 38529c from Hubble space telescope astrometry and high-precision radial velocities.

BENEDICT G.F., McARTHUR B.E., BEAN J.L., BARNES R., HARRISON T.E., HATZES A., MARTIOLI E. and NELAN E.P.

Abstract (from CDS):

Hubble Space Telescope Fine Guidance Sensor astrometric observations of the G4 IV star HD 38529 are combined with the results of the analysis of extensive ground-based radial velocity (RV) data to determine the mass of the outermost of two previously known companions. Our new RVs obtained with the Hobby-Eberly Telescope and velocities from the Carnegie-California group now span over 11 yr. With these data we obtain improved RV orbital elements for both the inner companion, HD 38529b, and the outer companion, HD 38529c. We identify a rotational period of HD 38529 (Prot= 31.65 ± 0.<SUP>d</SUP>17) with Fine Guidance Sensor photometry. The inferred star spot fraction is consistent with the remaining scatter in velocities being caused by spot-related stellar activity. We then model the combined astrometric and RV measurements to obtain the parallax, proper motion, perturbation period, perturbation inclination, and perturbation size due to HD 38529c. For HD 38529c we find P = 2136.1±0.3 d, perturbation semimajor axis α = 1.05±0.06 mas, and inclination i = 48°.3±3°.7. Assuming a primary mass M*= 1.48 M, we obtain a companion mass Mc= 17.6+1.5 –1.2MJup, 3σ above a 13 MJup deuterium burning, brown dwarf lower limit. Dynamical simulations incorporating this accurate mass for HD 38529c indicate that a near-Saturn mass planet could exist between the two known companions. We find weak evidence of an additional low amplitude signal that can be modeled as a planetary-mass (∼0.17 MJup) companion at P ∼194 days. Including this component in our modeling lowers the error of the mass determined for HD 38529c. Additional observations (RVs and/or Gaia astrometry) are required to validate an interpretation of HD 38529d as a planetary-mass companion. If confirmed, the resulting HD 38529 planetary system may be an example of a "Packed Planetary System."

Abstract Copyright:

Journal keyword(s): astrometry - brown dwarfs - stars: distances - stars: individual: HD 38529 - stars: late-type - techniques: interferometric - techniques: radial velocities

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * eps Eri b Pl 03 32 55.8449634 -09 27 29.731165           ~ 111 1
2 * eps Eri BY* 03 32 55.8449634 -09 27 29.731165 5.19 4.61 3.73 3.00 2.54 K2V 1760 1
3 HD 33636 Pe* 05 11 46.4489745849 +04 24 12.759759957   7.64   6.6   G0V_CH-0.3 171 1
4 HD 33636b * 05 11 46.4490 +04 24 12.742           M6V 42 1
5 UCAC2 32153128 * 05 46 27.0110123980 +01 10 59.554647705       13.35   ~ 3 0
6 UCAC2 32153133 * 05 46 29.8791423854 +01 10 56.658380946       13.92   ~ 1 0
7 UCAC2 32153144 * 05 46 34.0950657770 +01 11 39.458773554       13.24   ~ 1 0
8 HD 38529b Pl 05 46 34.9129896843 +01 10 05.512540812           ~ 79 1
9 HD 38529 PM* 05 46 34.9129896843 +01 10 05.512540812       5.4   G8III/IV 322 2
10 HD 38529c Pl 05 46 34.9129896843 +01 10 05.512540812           ~ 68 1
11 UCAC2 32153150 * 05 46 37.3367626553 +01 09 27.768583558       14.26   ~ 1 0
12 HD 74156c Pl 08 42 25.1221445320 +04 34 41.146391815           ~ 53 1
13 * rho01 Cnc d Pl 08 52 35.8113282132 +28 19 50.956901366           ~ 140 1
14 HD 136118b Pl? 15 18 55.4730161019 -01 35 32.597619958           ~ 33 1
15 BD-15 6290b Pl 22 53 16.7323107416 -14 15 49.303409936           ~ 226 1

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2021.09.23-04:43:49

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