{
  "id": "1302.6231",
  "version": "v2",
  "published": "2013-02-25T21:00:00.000Z",
  "updated": "2013-03-03T22:17:51.000Z",
  "title": "Using High-Resolution Optical Spectra to Measure Intrinsic Properties of Low-Mass Stars: New Properties for KOI-314 and GJ 3470",
  "authors": [
    "J. Sebastian Pineda",
    "Michael Bottom",
    "John A. Johnson"
  ],
  "comment": "Accepted to ApJ",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We construct high signal-to-noise \"template\" spectra by co-adding hundreds of spectra of nearby dwarfs spanning K7 to M4, taken with Keck/HIRES as part of the California Planet Search. We identify several spectral regions in the visible (370 - 800 nm) that are sensitive to the stellar luminosity and metallicity. We use these regions to develop a spectral calibration method to measure the mass, metallicity, and distance of low-mass stars, without the requirement of geometric parallaxes. Testing our method on a sample of nearby M dwarfs we show that we can reproduce stellar masses to about 8 - 10%, metallicity to ~0.15 dex and distance to 11%. We were able to make use of HIRES spectra obtained as part of the radial velocity monitoring of the star KOI-314 to derive a new mass estimate of 0.57 +/- 0.05 Msun, a radius of 0.54 +/- 0.05 Rsun, a metallicity, [Fe/H], of -0.28 +/- 0.10 and a distance of 66.5 +/- 7.3 pc. Using HARPS archival data and combining our spectral method with constraints from transit observations, we are also able to derive the stellar properties of GJ3470, a transiting planet hosting M dwarf. We estimate a mass of 0.53 +/- 0.05 Msun, a radius of 0.50 +/- 0.05 Rsun, a metallicity, [Fe/H] = 0.12 +/- 0.12 and a distance of 29.9_{-3.4}^{+3.7} pc.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2013-03-03T22:17:51.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "measure intrinsic properties",
      "high-resolution optical spectra",
      "low-mass stars",
      "metallicity",
      "construct high signal-to-noise"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/767/1/28",
      "journal": "The Astrophysical Journal",
      "year": 2013,
      "month": "Apr",
      "volume": 767,
      "number": 1,
      "pages": 28
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1221169,
      "adsabs": "2013ApJ...767...28P"
    }
  }
}