{
  "id": "0911.2008",
  "version": "v1",
  "published": "2009-11-10T21:10:58.000Z",
  "updated": "2009-11-10T21:10:58.000Z",
  "title": "Starspot Jitter in Photometry, Astrometry and Radial Velocity Measurements",
  "authors": [
    "V. V. Makarov",
    "C. A. Beichman",
    "J. H. Catanzarite",
    "D. A. Fischer",
    "J. Lebreton",
    "F. Malbet",
    "M. Shao"
  ],
  "comment": "accepted in ApJ Letters, Nov. 2009",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "Analytical relations are derived for the amplitude of astrometric, photometric and radial velocity perturbations caused by a single rotating spot. The relative power of the star spot jitter is estimated and compared with the available data for $\\kappa^1$ Ceti and HD 166435, as well as with numerical simulations for $\\kappa^1$ Ceti and the Sun. A Sun-like star inclined at $i=90\\degr$ at 10 pc is predicted to have a RMS jitter of 0.087 \\uas in its astrometric position along the equator, and 0.38 m s$^{-1}$ in radial velocities. If the presence of spots due to stellar activity is the ultimate limiting factor for planet detection, the sensitivity of SIM Lite to Earth-like planets in habitable zones is about an order of magnitude higher that the sensitivity of prospective ultra-precise radial velocity observations of nearby stars.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-11-10T21:10:58.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "radial velocity measurements",
      "starspot jitter",
      "prospective ultra-precise radial velocity observations",
      "photometry",
      "astrometry"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/707/1/L73",
      "journal": "The Astrophysical Journal",
      "year": 2009,
      "month": "Dec",
      "volume": 707,
      "number": 1
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 836610,
      "adsabs": "2009ApJ...707L..73M"
    }
  }
}