J/other/FrASS/8.624907 (Sub)Stellar companions of exoplanet hosts (Michel+ 2021)
Search for (sub)stellar Companions of Exoplanet Hosts by Exploring the Second
ESA-Gaia Data Release.
Michel K.-U., Mugrauer M.
<Front. Astron. Space Sci., 8.624907 (2021)>
=2021FrASS.8.624907M 2021FrASS.8.624907M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Stars, brown dwarf ; Exoplanets
Keywords: Multiple stars - white dwarfs - brown dwarfs - exoplanets -
ESA-Gaia DR2
Abstract:
We present the latest results of an ongoing multiplicity survey of
exoplanet hosts, which was initiated at the Astrophysical Institute
and University Observatory Jena, using data from the second data
release of the ESA-Gaia mission. In this study the multiplicity of 289
targets was investigated, all located within a distance of about 500pc
from the Sun. In total, 41 binary, and five hierarchical triple star
systems with exoplanets were detected in the course of this project,
yielding a multiplicity rate of the exoplanet hosts of about 16%. A
total of 61 companions (47 stars, a white dwarf, and 13 brown dwarfs)
were detected around the targets, whose equidistance and common proper
motion with the exoplanet hosts were proven with their precise Gaia
DR2 astrometry, which also agrees with the gravitational stability of
most of these systems. The detected companions exhibit masses from
about 0.016 up to 1.66M☉ and projected separations in the range
between about 52 and 9555au.
Description:
The astrometry and photometry of the exoplanet hosts and of their
(sub)stellar companions are summarized together with the derived
properties of the companions.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 202 121 Astrometry and photometry of planet hosts and
companions
table3.dat 95 61 Relative astrometry of companions
table4.dat 75 61 Equatorial coordinates and properties of
companions
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Star Name
17 A1 --- n_Name [*] * for exoplanet host
19- 26 F8.4 mas Plx Gaia DR2 parallax
28- 33 F6.4 mas e_Plx Error of parallax
35- 43 F9.3 mas/yr pmRA Gaia DR2 proper motion in right ascension,
pmRA*cosDE
45- 49 F5.3 mas/yr e_pmRA Error of proper motion in right ascension
51- 59 F9.3 mas/yr pmDE Gaia DR2 proper motion in declination
61- 65 F5.3 mas/yr e_pmDE Error of proper motion in declination
67- 71 F5.3 mas epsi Gaia DR2 astrometric excess noise
73- 78 F6.1 --- sepsi ? Gaia DR2 significance of astrometric
excess noise
80- 86 F7.4 mag Gmag Gaia DR2 G-band mean magnitude
88- 93 F6.4 mag e_Gmag Error of Gaia DR2 G-band mean magnitude
95-100 F6.4 mag AG ? Gaia DR2 estimate of G-band extinction
102 A1 --- --- [-]
103-108 F6.4 mag e_AG ? Lower error of G-band extinction
110 A1 --- --- [+]
111-116 F6.4 mag E_AG ? Upper error of G-band extinction
118 A1 --- Note1 [x] x if AG is derived from AV
120-122 A3 --- Note2 [SHC] SHC if AG is derived from Starhorse
catalog
124-126 A3 --- Note3 [HIP] HIP if parallax from Hipparcos
128-135 A8 --- --- [Gaia DR2]
137-155 I19 --- GaiaDR2 Gaia DR2 identification number
158-172 F15.11 deg RAdeg Right Ascension (ICRS) at Ep=2015.5
174-179 F6.4 mas e_RAdeg Error of Right Ascension
181-195 F15.11 deg DEdeg Declination (ICRS) at Ep=2015.5
197-202 F6.4 mas e_DEdeg Error of Declination
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Name of stellar companion (1)
17- 25 F9.5 arcsec rho Angular separation
27- 33 F7.5 arcsec e_rho Error of angular separation
35- 43 F9.5 deg PA Position angle
45- 51 F7.5 deg e_PA Error of position angle
53- 56 F4.2 mas Dplx Parallax difference
58- 61 F4.2 mas e_Dplx Error of parallax difference
63- 66 F4.1 --- sDplx Significance of parallax difference
68- 70 F3.1 --- sDplx-epsi ? Significance of parallax difference
including epsi
72- 76 F5.2 mas/yr mu-rel Differential proper motion (2)
78- 81 F4.2 mas/yr e_mu-rel Error of differential proper motion
83- 88 F6.1 --- smu-rel Significance of differential proper motion
90- 95 F6.1 --- CPM Common Proper Motion Index (3)
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Note (1): Companions which are spectroscopic binaries are designated with (SB).
Note (2): differential proper motion between the companion relative to the
exoplanet host star (murel=|muPH-mucomp|, with the proper motion of the
exoplanet host star muPH and of the companion muComp).
Note (3): the common proper motion index, which is defined as
CPM = |muPH+mucomp|/mu-rel, with the proper motion of the exoplanet host
star muPH and of the companion muComp.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Name of (sub)stellar companion
17- 31 F15.11 deg RAdeg Right Ascension (ICRS) at Ep=2015.5
33- 47 F15.11 deg DEdeg Declination (ICRS) at Ep=2015.5
50- 54 F5.2 mag GMAG Absolute magnitude in G-band
56- 59 I4 au Sep Projected separation to the exoplanet host
61 A1 --- l_Mass [~] Limit flag on Mass
63- 67 F5.3 Msun Mass Mass of (sub)stellar companion
69- 72 I4 K Teff ? Effective temperature
74- 75 A2 --- Note [WD] WD if companion is a white dwarf
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Acknowledgements:
Kai-Uwe Michel, kai-uwe.michel(at)uni-jena.de
(End) Kai-Uwe Michel [AIU Jena], Patricia Vannier [CDS] 15-Mar-2021