J/MNRAS/527/3183 (Sub)Stellar companions of exoplanet hosts (Michel+ 2024)
Gaia search for (sub)stellar companions of exoplanet hosts.
Michel K.-U., Mugrauer M.
<Mon. Not. R. Astron. Soc., 527, 3183-3195 (2024)>
=2024MNRAS.527.3183M 2024MNRAS.527.3183M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Optical
Keywords: astrometry - binaries: general - binaries: visual - brown dwarfs -
stars: fundamental parameters - white dwarfs
Abstract:
We conduct a survey, which explores the data releases of the ESA-Gaia
mission, in order to investigate the multiplicity of exoplanet hosts
at distances of less than 625pc around the Sun. With the accurate Gaia
astrometry we are able to detect stellar and substellar companions of
exoplanet hosts by proving the equidistance and common proper motion
of these objects. Furthermore, by using the astro- and photometric
data provided by the ESA-Gaia mission, we characterize the nature of
the identified companions (substellar, stellar, main-sequence, or
evolved), determine their properties (mass, effective temperature, and
projected separation to the associated exoplanet host), and verify
their orbital stability. In addition to main-sequence stars, the
companions detected in this study include several brown and white
dwarfs. So far in the course of our survey, the multiplicity of more
than 2200 exoplanet hosts could be investigated, yielding a
multiplicity rate of about 16 per cent (increased to about 19 per cent
including published detections from other surveys). Finally, the
derived physical properties of the companions were used to investigate
the impact of the stellar multiplicity on the properties of the
exoplanets and their hosts. In general, there are significant
differences in the properties of these objects, dependent on the
multiplicity status of their host system, e.g. higher masses of both
planets and exoplanet hosts in multiple star systems. Furthermore, the
masses and orbital eccentricities of multiple star planets
significantly depend on the gravitational impact, induced by the
companion star of the exoplanet host.
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 153 742 Astrometry and photometry of planet hosts and
companions
table3.dat 96 380 Relative astrometry of companions
table4.dat 88 380 Equatorial coordinates and properties of
companions
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See also:
I/355 : Gaia DR3, part 1 (Gaia Collaboration, 2022)
J/MNRAS/490/5088 : Stellar companions of exoplanet host stars
(Mugrauer, 2019)
J/other/FrASS/8.624907 : (Sub)Stellar companions of exoplanet hosts
(Michel+, 2021)
J/AN/341/996 : Stellar companions of (C)TOIs (Mugrauer+, 2020)
J/AN/342/840 : Stellar companions of (C)TOIs (Mugrauer+, 2021)
J/AN/343/24017 : Stellar companions of (C)TOIs (Mugrauer+, 2022)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Star Name
18 A1 --- n_Name [*] * for exoplanet host
20- 27 F8.4 mas Plx Gaia DR3 parallax
29- 34 F6.4 mas e_Plx Error of parallax
36- 44 F9.3 mas/yr pmRA Gaia DR3 proper motion in right ascension,
pmRA*cosDE
46- 50 F5.3 mas/yr e_pmRA Error of proper motion in right ascension
52- 60 F9.3 mas/yr pmDE Gaia DR3 proper motion in declination
62- 66 F5.3 mas/yr e_pmDE Error of proper motion in declination
68- 72 F5.3 mas epsi ? Gaia DR3 astrometric excess noise
74- 81 F8.1 --- sepsi ? Gaia DR3 significance of astrometric
excess noise
83- 89 F7.4 mag Gmag Gaia DR3 G-band mean magnitude
91- 96 F6.4 mag e_Gmag Error of Gaia DR3 G-band mean magnitude
98-103 F6.4 mag AG ? Estimate of G-band extinction
105 A1 --- --- [-]
106-111 F6.4 mag e_AG ? Lower error of G-band extinction
113 A1 --- --- [+]
114-119 F6.4 mag E_AG ? Upper error of G-band extinction
121 A1 --- Note1 [x] x if AG is derived from AV
123-137 F15.11 deg RAdeg Right Ascension (ICRS) at Ep=2016.5
139-153 F15.11 deg DEdeg Declination (ICRS) at Ep=2016.5
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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- 16 A16 --- Name Name of stellar companion (1)
17 A1 --- --- [*]
18- 26 F9.5 arcsec rho Angular separation
28- 34 F7.5 arcsec e_rho Error of angular separation
36- 44 F9.5 deg PA Position angle
46- 52 F7.5 deg e_PA Error of position angle
54- 57 F4.2 mas Dplx Parallax difference
59- 62 F4.2 mas e_Dplx Error of parallax difference
64- 67 F4.1 --- sDplx Significance of parallax difference
69- 71 F3.1 --- sDplx-epsi ? Significance of parallax difference
including epsi
73- 77 F5.2 mas/yr mu-rel Differential proper motion (2)
79- 82 F4.2 mas/yr e_mu-rel Error of differential proper motion
84- 89 F6.1 --- smu-rel Significance of differential proper motion
91- 96 F6.1 --- CPM Common Proper Motion Index (3)
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Note (1): Companions which are spectroscopic binaries are designated with (SB),
those which are eclipsing binary stars with (EB)
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- 16 A16 --- Name Name of (sub)stellar companion
17 A1 --- --- [*]
18- 32 F15.11 deg RAdeg Right Ascension (ICRS) at Ep=2016.5
34- 48 F15.11 deg DEdeg Declination (ICRS) at Ep=2016.5
50- 55 F6.3 mag GMAG Absolute magnitude in G-band
57- 61 I5 au Sep Projected separation to the exoplanet host
63 A1 --- l_Mass [~] Limit flag on Mass
65- 75 A11 Msun Mass Mass of (sub)stellar companion
77- 85 A9 K Teff ? Effective temperature
87- 88 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,
Markus Mugrauer
(End) Patricia Vannier [CDS] 19-Feb-2024