20.13.7 vari_compact_companion

This table describes the compact companion candidates.

Columns description:

solution_id : Solution Identifier (long)

All Gaia data processed by the Data Processing and Analysis Consortium comes tagged with a solution identifier. This is a numeric field attached to each table row that can be used to unequivocally identify the version of all the subsystems that were used in the generation of the data as well as the input data used. It is mainly for internal DPAC use but is included in the published data releases to enable end users to examine the provenance of processed data products. To decode a given solution ID visit https://gaia.esac.esa.int/decoder/solnDecoder.jsp

source_id : Unique source identifier (long)

A unique single numerical identifier of the source obtained from gaia_source (for a detailed description see gaia_source.source_id).

period : Orbital period (double, Time[day])

Orbital period of the binary system.

period_error : Orbital period error (float, Time[day])

Orbital period 1-sigma uncertainty.

t0_g : G-band reference time (double, Time[Barycentric JD in TCB $-$ 2 455 197.5 (day)])

$G$-band light-curve model reference time (see harmonic_model_params_g description).

t0_g_error : G-band reference time error (float, Time[day])

$G$-band light-curve model reference time error.

t0_bp : BP-band reference time (double, Time[Barycentric JD in TCB $-$ 2 455 197.5 (day)])

$G_{\mathrm{BP}}$-band light-curve model reference time (see harmonic_model_params_bp description).

The parameter is NULL when the number of points in the $G_{\mathrm{BP}}$-band time series is strictly less than 25.

t0_bp_error : BP-band reference time error (float, Time[day])

$G_{\mathrm{BP}}$-band light-curve model reference time error.

The parameter is NULL when the number of points in the $G_{\mathrm{BP}}$-band time series is strictly less than 25.

t0_rp : RP-band reference time (double, Time[Barycentric JD in TCB $-$ 2 455 197.5 (day)])

$G_{\mathrm{RP}}$-band light-curve model reference time (see harmonic_model_params_rp description).

The parameter is NULL when the number of points in the $G_{\mathrm{RP}}$-band time series is strictly less than 25.

t0_rp_error : RP-band reference time error (float, Time[day])

$G_{\mathrm{RP}}$-band light-curve model reference time error.

The parameter is NULL when the number of points in the $G_{\mathrm{RP}}$-band time series is strictly less than 25.

harmonic_model_params_g : G-band harmonics (float[6] array, Magnitude[mag])

The $G$-band light curve is fitted by a three-harmonics model:

$\mathrm{𝚖𝚘𝚍𝚎𝚕}\mathrm{\_}\mathrm{𝚖𝚎𝚊𝚗}\mathrm{\_}𝚐+a1cG*\cos (\omega (t-\mathrm{𝚝𝟶}\mathrm{\_}𝚐))+a2cG*\cos (2\omega *(t-\mathrm{𝚝𝟶}\mathrm{\_}𝚐))+a3cG*\cos (3\omega *(t-\mathrm{𝚝𝟶}\mathrm{\_}𝚐))+a1sG*\sin (\omega (t-\mathrm{𝚝𝟶}\mathrm{\_}𝚐))+a2sG*\sin (2\omega (t-\mathrm{𝚝𝟶}\mathrm{\_}𝚐))+a3sG*\sin (3\omega *(t-\mathrm{𝚝𝟶}\mathrm{\_}𝚐))$.

$\omega$ is the orbital frequency $2\pi$/period, and the reference time t0_g is set to obtain a2sG = 0. $t$ is a Barycentric JD in TCB $-$ 2 455 197.5 (day).

Fourier coefficients are given in harmonic_model_params_g: [a1cG, a2cG, a3cG, a1sG, a2sG, a3sG], and their errors are given in harmonic_model_params_g_error in the same order.

harmonic_model_params_g_error : G-band harmonics errors (float[6] array, Magnitude[mag])

$G$-band harmonics parameters 1-sigma uncertainty.

harmonic_model_params_bp : BP-band harmonics (float[6] array, Magnitude[mag])

The $G_{\mathrm{BP}}$-band light curve is fitted by a three-harmonics model:

$\mathrm{𝚖𝚘𝚍𝚎𝚕}\mathrm{\_}\mathrm{𝚖𝚎𝚊𝚗}\mathrm{\_}\mathrm{𝚋𝚙}+a1cBp*\cos (\omega (t-\mathrm{𝚝𝟶}\mathrm{\_}\mathrm{𝚋𝚙}))+a2cBp*\cos (2\omega *(t-\mathrm{𝚝𝟶}\mathrm{\_}\mathrm{𝚋𝚙}))+a3cBp*\cos (3\omega *(t-\mathrm{𝚝𝟶}\mathrm{\_}\mathrm{𝚋𝚙}))+a1sBp*\sin (\omega (t-\mathrm{𝚝𝟶}\mathrm{\_}\mathrm{𝚋𝚙}))+a2sBp*\sin (2\omega (t-\mathrm{𝚝𝟶}\mathrm{\_}\mathrm{𝚋𝚙}))+a3sBp*\sin (3\omega *(t-\mathrm{𝚝𝟶}\mathrm{\_}\mathrm{𝚋𝚙}))$.

$\omega$ is the orbital frequency $2\pi$/period, and the reference time t0_bp is set to obtain a2sBp = 0. $t$ is a Barycentric JD in TCB $-$ 2 455 197.5 (day).

Fourier coefficients are given in harmonic_model_params_bp: [a1cBp, a2cBp, a3cBp, a1sBp, a2sBp, a3sBp], and their errors are given in harmonic_model_params_bp_error in the same order.

The parameter is an array of NaN when the number of points in the $G_{\mathrm{BP}}$-band time series is strictly less than 25.

harmonic_model_params_bp_error : BP-band harmonics errors (float[6] array, Magnitude[mag])

$G_{\mathrm{BP}}$-band harmonics parameters 1-sigma uncertainty.

The parameter is an array of NaN when the number of points in the $G_{\mathrm{BP}}$-band time series is strictly less than 25.

harmonic_model_params_rp : RP-band harmonics (float[6] array, Magnitude[mag])

The $G_{\mathrm{RP}}$-band light curve is fitted by a three-harmonics model:

$\mathrm{𝚖𝚘𝚍𝚎𝚕}\mathrm{\_}\mathrm{𝚖𝚎𝚊𝚗}\mathrm{\_}\mathrm{𝚛𝚙}+a1cRp*\cos (\omega (t-\mathrm{𝚝𝟶}\mathrm{\_}\mathrm{𝚛𝚙}))+a2cRp*\cos (2\omega *(t-\mathrm{𝚝𝟶}\mathrm{\_}\mathrm{𝚛𝚙}))+a3cRp*\cos (3\omega *(t-\mathrm{𝚝𝟶}\mathrm{\_}\mathrm{𝚛𝚙}))+a1sRp*\sin (\omega (t-\mathrm{𝚝𝟶}\mathrm{\_}\mathrm{𝚛𝚙}))+a2sRp*\sin (2\omega (t-\mathrm{𝚝𝟶}\mathrm{\_}\mathrm{𝚛𝚙}))+a3sRp*\sin (3\omega *(t-\mathrm{𝚝𝟶}\mathrm{\_}\mathrm{𝚛𝚙}))$.

$\omega$ is the orbital frequency $2\pi$/period, and the reference time t0_rp is set to obtain a2sRp = 0. $t$ is a Barycentric JD in TCB $-$ 2 455 197.5 (day).

Fourier coefficients are given in harmonic_model_params_rp: [a1cRp, a2cRp, a3cRp, a1sRp, a2sRp, a3sRp], and their errors are given in harmonic_model_params_rp_error in the same order.

The parameter is an array of NaN when the number of points in the $G_{\mathrm{RP}}$-band time series is strictly less than 25.

harmonic_model_params_rp_error : RP-band harmonics errors (float[6] array, Magnitude[mag])

$G_{\mathrm{RP}}$-band harmonics parameters 1-sigma uncertainty.

The parameter is an array of NaN when the number of points in the $G_{\mathrm{RP}}$-band time series is strictly less than 25.

model_mean_g : Harmonics model mean G-band magnitude (float, Magnitude[mag])

$G$-band mean magnitude derived by the three-harmonics model.

model_mean_g_error : Harmonics model mean G-band magnitude error (float, Magnitude[mag])

$G$-band model mean magnitude 1-sigma uncertainty.

model_mean_bp : Harmonics model mean BP-band magnitude (float, Magnitude[mag])

$G_{\mathrm{BP}}$-band mean magnitude derived by the three-harmonics model.

The parameter is NULL when the number of points in the $G_{\mathrm{BP}}$-band time series is strictly less than 25.

model_mean_bp_error : Harmonics model mean BP-band magnitude error (float, Magnitude[mag])

$G_{\mathrm{BP}}$-band model mean magnitude 1-sigma uncertainty.

The parameter is NULL when the number of points in the $G_{\mathrm{BP}}$-band time series is strictly less than 25.

model_mean_rp : Harmonics model mean RP-band magnitude (float, Magnitude[mag])

$G_{\mathrm{RP}}$-band mean magnitude derived by the three-harmonics model.

The parameter is NULL when the number of points in the $G_{\mathrm{RP}}$-band time series is strictly less than 25.

model_mean_rp_error : Harmonics model mean RP-band magnitude error (float, Magnitude[mag])

$G_{\mathrm{RP}}$-band model mean magnitude 1-sigma uncertainty.

The parameter is NULL when the number of points in the $G_{\mathrm{RP}}$-band time series is strictly less than 25.

mod_min_mass_ratio : Modified minimum mass ratio (float)

Mass ratio of the system — ratio of secondary (less luminous) to primary mass. Modified minimum value is found by assuming primary fills its Roche-Lobe and inclination is 90 deg (‘edge-on’). Mathematical expressions are given by Gomel, Faigler, and Mazeh (2021a).

mod_min_mass_ratio_one_sigma : 15.9%-percentile modified minimum mass ratio (float)

The 15.9%-percentile modified minimum mass ratio of the system, considering the leading harmonic (a2c) and alpha uncertainties.

mod_min_mass_ratio_three_sigma : 0.135%-percentile modified minimum mass ratio (float)

The 0.135%-percentile modified minimum mass ratio of the system, considering the leading harmonic (a2c) and alpha uncertainties.

alpha : alpha ellipsoidal coefficient (float)

The alpha ellipsoidal coefficient of the leading second harmonic term is assumed to be 1.3 for almost all systems. When mod_min_mass_ratio cannot be derived using this value (1.3), we find the minimum value of alpha, derived for mod_min_mass_ratio of 100, and this value is given instead of 1.3. See Section 10.6 of the release documentation for details.