{
  "abstract": "The subtle Doppler radial velocity (RV) signature of an Earth-mass exoplanet in the Habitable Zone around a nearby Sun-like star is difficult to detect due to stellar variability. While multiple techniques aim to mitigate rotationally-modulated stellar activity, granulation, introducing 0.1-1 m s$^{-1}$ RV shifts, currently sets the floor for detecting Earth-mass RV signals for low-activity stars. Observations of the Rossiter-McLaughlin (RM) effect during a solar eclipse, with a peak-to-trough amplitude of $\\sim$1.4 km s$^{-1}$, are a rigorous test of granulation and convective blueshift in the solar spectrum. Using NEID solar feed data of the October 2023 solar eclipse and GRASS-E (a geometry-modified version of GRASS), we compare the observed RVs for 22 lines with the simulated RVs from the synthetic granulation-driven spectra. Residuals of the GRASS-E Fe I 5434 angstrom model show an RMS of 13.47 m s$^{-1}$ over the RM signal. We find that a model with an optimized convective blueshift polynomial for Fe I 5434 significantly outperforms GRASS-E with an RMS of only 2.90 m s$^{-1}$, suggesting that GRASS-E is currently limited by sparse center-to-limb observations. By combining a set of spectral lines, we achieve a weighted RMS of 5.2 m s$^{-1}$ over the RM signal ($\\sim$0.37\\%), a level of accuracy well beyond the reach of current exoplanet transit observations. In all, we demonstrate that solar eclipse observations allow us to recover the center-to-limb variation of the convective blueshift for individual spectral lines.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.03898",
  "author_total": 20,
  "authors": [
    {
      "name": "Elizabeth Gonzalez"
    },
    {
      "name": "Michael L. Palumbo III"
    },
    {
      "name": "Suvrath Mahadevan"
    },
    {
      "name": "Eric B. Ford"
    },
    {
      "name": "Sarah E. Logsdon"
    },
    {
      "name": "Chad F. Bender"
    },
    {
      "name": "Andrea S. J. Lin"
    },
    {
      "name": "Daniel M. Krolikowski"
    },
    {
      "name": "Ashutosh Joshi"
    },
    {
      "name": "Joe P. Ninan"
    },
    {
      "name": "Jason T. Wright"
    },
    {
      "name": "Ansgar Reiners"
    },
    {
      "name": "Samuel Halverson"
    },
    {
      "name": "Michael W. McElwain"
    },
    {
      "name": "Jayadev Rajagopal"
    },
    {
      "name": "Paul Robertson"
    },
    {
      "name": "Arpita Roy"
    },
    {
      "name": "Christian Schwab"
    },
    {
      "name": "Gudmundur Stefansson"
    },
    {
      "name": "Ryan C. Terrien"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/b0mqtn2sgppqm.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.03898",
  "fulltext_url": null,
  "id": "b0mqtn2sgppqm",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.03898",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.SR"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.03898",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/b0mqtn2sgppqm.ris",
  "sources": [
    {
      "first_seen": "2026-11-04T15:21:25Z",
      "native_id": "2611.03898",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.03898"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "Shadowing the Sun I: Testing Synthetic Granulation Spectra with NEID Solar Eclipse Observations",
  "title_text": "Shadowing the Sun I: Testing Synthetic Granulation Spectra with NEID Solar Eclipse Observations",
  "type": "preprint",
  "updated_at": "2026-11-06T18:21:01Z",
  "url": "https://research.draconitic.com/paper/b0mqtn2sgppqm",
  "venue": "arXiv",
  "versions": []
}