DOI: 10.5281/zenodo.17664386
title: J-VAR Data Release 1: variability indices

description: Dataset of the variability indices calculated from the light curves of J-VAR Data Release 1. The single tarball file contains 101 individual fits files, one for every field of the DR1, following the naming convention VARIABILITY_INDICES_NNNNN.fits, where NNNNN is the corresponding field number. 

The data are contained in the "CATALOGUE" BinTable extension of the fits file. The table contains the following columns:

 -- OBJ_ID                  - the J-PLUS object ID, with format {REF_TILE}-{NUMBER}

-- BANNJOS             - Object classification via the BANNJOS algorithm (del Pino et al. 2024); classes are 'STAR','QSO','APS' (= Ambiguous Point Source)

-- MORPH_FLAG     - Binary flag to indicate potential issues with an object's morphology (0 = no, 1 = yes)

-- VSX_TYPE            - The VSX variable type classification of known variables; value is 'N/A' for all other objects      

-- VSX_PERIOD      - The period (if available, otherwise period=0) of known variables; value is also 0 for all other objects

-- GAIA_VAR            - Flag to indicate whether or not the object is classified as variable (phot_variable_flag in gaia_source). Values are 0 if no (GAIA=NOT_AVAILABLE), 1                                         if   yes (GAIA=VARIABLE), -1 for unmatched objects       

-- GAIA_CLASS       - The GAIA classification of the variable (best_class_name in vari_classifier_result). There are GAIA objects flagged as 'VARIABLE' but without                                                      classification (in_vari_classification_result == False in vari_summary). These objects are assigned a 'NO_CLASS' value, while unmatched objects                                                  are assigned an 'N/A' value

-- GAIA_SCORE     - The score of the GAIA classification algorithm (best_class_score in vari_classifier_result). 'VARIABLE' objects with 'NO_CLASS' get a score=0,                                                     unmatched objects get a score=-1

The rest of the columns that follow have been calculated using two different definitions of "valid photometric point" for the data points of a given light curve. The first, more relaxed, definition requires that the photometric flag of a point is < 1024.  Columns preceded with a "*" are actually 2D-arrays with shape (Nstars, NFilters), where Nstars is the number of stars in the given field and NFilters are the 7 photometric filters used in J-VAR in the following order: gSDSS, rSDSS, iSDSS, J0395, J0515, J0660, J0861 

*-- MEDIAN_F1024          - The median magnitude of the lightcurve

*-- PPERC_F1024             - The percentage of valid photometric points for a given light curve with respect to the number of field images

*-- IND_MAD_F1024       - The Median Absolute Deviation

*-- IND_IQR_F1024          - The InterQuartile Range

*-- IND_ROMS_F1024     - The RObust Median Statistic

*-- IND_VONN_F1024    - The (inverted) von Neumann ratio

-- IND_WS_GR_F1024    - The Welch-Stetson index I calculated for the gSDSS and rSDSS filters

-- IND_WS_RI_F1024     - The Welch-Stetson index I calculated for the rSDSS and iSDSS filters

The exact same columns are replicated for the second, stricter, definition of "valid photometric point" that requires that the photometric flag is = 0. The columns have the same names, just replacing "F1024" for "F0".