2007AJ....134..749B


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.19CEST19:44:41

2007AJ....134..749B - Astron. J., 134, 749-758 (2007/August-0)

The mass of the candidate exoplanet companion to HD 33636 from Hubble Space Telescope astrometry and high-precision radial velocities.

BEAN J.L., McARTHUR B.E., BENEDICT G.F., HARRISON T.E., BIZYAEV D., NELAN E. and SMITH V.V.

Abstract (from CDS):

We have determined a dynamical mass for the companion to HD 33636 that indicates it is a low-mass star instead of an exoplanet. Our result is based on an analysis of Hubble Space Telescope (HST) astrometry and ground-based radial velocity data. We have obtained high-cadence radial velocity measurements spanning 1.3 yr of HD 33636 with the Hobby-Eberly Telescope at McDonald Observatory. We combined these data with previously published velocities to create a data set that spans 9 yr. We used this data set to search for, and place mass limits on, the existence of additional companions in the HD 33636 system. Our high-precision astrometric observations of the system with the HST Fine Guidance Sensor 1r span 1.2 yr. We simultaneously modeled the radial velocity and astrometry data to determine the parallax, proper motion, and perturbation orbit parameters of HD 33636. Our derived parallax, πabs=35.6±0.2 mas, agrees within the uncertainties with the Hipparcos value. We find a perturbation period P=2117.3±0.8 days, semimajor axis aA=14.2±0.2 mas, and system inclination i=4.1°±0.1°. Assuming the mass of the primary star to be MA=1.02±0.03 M, we obtain a companion mass MB=142±11 MJup=0.14±0.01 M. The much larger true mass of the companion relative to its minimum mass estimated from the spectroscopic orbit parameters (Msini=9.3 MJup) is due to the nearly face-on orbit orientation. This result demonstrates the value of follow-up astrometric observations to determine the true masses of exoplanet candidates detected with the radial velocity method.

Abstract Copyright:

Journal keyword(s): Astrometry - Stars: Planetary Systems - Stars: Distances - stars: individual (HD 33636) - Techniques: Interferometric - Techniques: Radial Velocities

CDS comments: Reference stars from tables 4 and 5 not found in UCAC catalogue, not in SIMBAD.

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 * eps Eri BY* 03 32 55.8449634 -09 27 29.731165 5.19 4.61 3.73 3.00 2.54 K2V 1658 1
2 HD 33636 Pe* 05 11 46.4489745849 +04 24 12.759759957   7.64   6.6   G0V_CH-0.3 160 1
3 HD 33636b * 05 11 46.4490 +04 24 12.742           M6V 40 1
4 HD 38529 PM* 05 46 34.9129896843 +01 10 05.512540812       5.4   G8III/IV 305 2
5 * rho01 Cnc PM* 08 52 35.8113282132 +28 19 50.956901366 7.45 6.82   5.4   K0IV-V 945 1
6 HD 149026b Pl 16 30 29.6184841164 +38 20 50.310893575           ~ 288 1
7 HD 168443 PM* 18 20 03.9331764016 -09 35 44.609316076   7.62 6.92     G6V 276 1
8 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1005 1
9 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1396 1
10 BD-15 6290 BY* 22 53 16.7323107416 -14 15 49.303409936 12.928 11.749 10.192 9.013 7.462 M3.5V 829 1

    Equat.    Gal    SGal    Ecl

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2019.10.19-19:44:41

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