Searching for compact hierarchical triple systems candidates in astrometric binaries and accelerated solutions

This dataset contains the tables accompanying the paper "Searching for compact hierarchical triple systems candidates in astrometric binaries and accelerated solutions" by Bashi D. & Tokovinin A. accepted to A&A Nov-2024.

The data tables contain information on Gaia orbital and accelerated sources from the Gaia DR3 Non-Single Star catalogue, sorted by the difference between RV-based and astrometric semi-amplitudes (ΔK) and by radial velocity standard deviation (σRV), respectively.

*Table 1** lists Gaia orbital source IDs sorted by ΔK, including all sources analysed, not only the CHT candidates. The exact cut used to identify the 956 CHT candidates is ΔK > 5 km/s.

**Table 4** lists Gaia accelerated source IDs sorted by σRV, including all sources analysed, not only the close binaries in accelerated solutions. The exact cut used to identify the 3,115 triple candidates is based on the relation:

    log10(RV_sig) > 0.22356214723314 + exp(0.703222411*(grvs_mag - 12.73160))

                    + 3 * 10^(0.262670 - 0.0873498006*grvs_mag)

where RV_sig is the radial velocity standard deviation, and grvs_mag is the integrated GRVS magnitude from Gaia.

For each source, we provide the Gaia DR3 source identifier, right ascension and declination, various semi-amplitudes derived from astrometric and radial velocity data, and other relevant parameters.

The data files are provided in **FITS format**.

File Summary:

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FileName      Lrecl    Records    Explanations

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ReadMe                     80          .   This file

table1.fits                19,858  Gaia orbital sources sorted by ΔK

table4.fits                81,852  Gaia accelerated sources sorted by σRV

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See also:

    I/355 : Gaia DR3 Catalogue (Gaia Collaboration, 2022)

    https://vizier.u-strasbg.fr/viz-bin/VizieR-3?-source=I/355

Byte-by-byte Description of file: table1.fits

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   Column     Format Units   Label     Explanations

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   SOURCE_ID  Int64  ---     Source    Gaia DR3 source identifier

   RA         Float64 deg    RAdeg     Right Ascension (ICRS) at epoch 2016.0

   DEC        Float64 deg    DEdeg     Declination (ICRS) at epoch 2016.0

   K_0        Float32 km/s   K0         Astrometric semi-amplitude

   K_1        Float32 km/s   K1        RV-based semi-amplitude

   K_0_ERROR  Float32 km/s e_K0        Error in K_0

   K_1_ERROR  Float32 km/s e_K1        Error in K_1

   K_DIFF     Float32 km/s   K_diff    Difference between K_0 and K_1 in sigmas

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Byte-by-byte Description of file: table4.fits

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   Column     Format Units     Label     Explanations

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   SOURCE_ID  Int64  ---       Source    Gaia DR3 source identifier

   RA         Float64 deg      RAdeg     Right Ascension (ICRS) at epoch 2016.0

   DEC        Float64 deg      DEdeg     Declination (ICRS) at epoch 2016.0

   ACC        Float32 AU/yr^2  acc       Astrometric acceleration

   sK_1       Float32 km/s     sK1       Estimated semi-amplitude sK_1

   sK_1_ERROR Float32 km/s   e_sK1       Error in sK_1

   RV_SIG     Float32 km/s     RVsig     Radial velocity standard deviation (RV_sig)

   GRVS_MAG   Float32 mag      GRVS      Gaia integrated GRVS magnitude

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Notes:

    - The astrometric acceleration (acc) in table4.fits is derived from Gaia DR3 data.

    - The RV_sig is the radial velocity standard deviation from Gaia DR3.