{
  "id": "2101.04290",
  "version": "v1",
  "published": "2021-01-12T04:33:12.000Z",
  "updated": "2021-01-12T04:33:12.000Z",
  "title": "Correction to the photometric colors of the Gaia Data Release 2 with the stellar color regression method",
  "authors": [
    "Zexi Niu",
    "Haibo Yuan",
    "Jifeng Liu"
  ],
  "comment": "16 pages , 15 figures",
  "categories": [
    "astro-ph.SR",
    "astro-ph.GA",
    "astro-ph.IM"
  ],
  "abstract": "The second Gaia data release (DR2) delivers accurate and homogeneous photometry data of the whole sky to an exquisite quality, reaching down to the unprecedented milli-magnitude (mmag) level for the G, GRP, and GBP passbands. However, the presence of magnitude-dependent systematic effects at the 10 mmag level limits its power in scientific exploitation. In this work, using about half-million stars in common with the LAMOST DR5, we apply the spectroscopy-based stellar color regression method to calibrate the Gaia G-GRP and GBP-GRP colors. With an unprecedented precision of about 1 mmag, systematic trends with G magnitude are revealed for both colors in great detail, reflecting changes in instrument configurations. Color dependent trends are found for the GBP-GRP color and for stars brighter than G~11.5 mag. The calibration is up to 20 mmag in general and varies a few mmag/mag. A revised color-color diagram of Gaia DR2 is given, and some applications are briefly discussed.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-01-12T04:33:12.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "photometric colors",
      "gbp-grp color",
      "spectroscopy-based stellar color regression method",
      "correction",
      "second gaia data"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}