{
  "abstract": "Solar-like oscillations in K dwarfs have intrinsically low amplitudes, making them challenging to detect in space-based photometry. The advent of Extremely Precise Radial Velocity (EPRV) instrumentation enables Doppler asteroseismology in the mid-K regime, providing a new opportunity to test mode-excitation and damping physics. We investigate the scaling of oscillation amplitudes with stellar parameters and assess whether 3D surface convection simulations reproduce the observed amplitude behavior. High-cadence ESPRESSO radial-velocity time series were obtained over five and six consecutive nights for the K dwarfs GJ 570 A (K4 V) and GJ 783 A (K2.5 V), respectively. We identified oscillation modes from weighted power spectra and extracted them via sine-wave fitting following spectral deconvolution. Peak mode amplitudes were measured from heavily smoothed power spectra. For comparison, we performed 3D radiative-hydrodynamical simulations including excitation and damping-rate calculations. We measured 6 modes for GJ 570 A and 24 for GJ 783 A ($\\ell=0$-$2$, and $\\ell=3$ for GJ 783 A). The peak radial-mode amplitudes are $2.57 \\pm 0.52\\:{\\rm cm\\,s^{-1}}$ and $4.90 \\pm 0.81\\:{\\rm cm\\,s^{-1}}$, respectively. These results support a transition from an $\\sim(L/M)^{0.7}$ amplitude scaling to a steeper $\\sim(L/M)^{1.5}$ scaling, occurring near the G/K-dwarf boundary toward decreasing $L/M$. In contrast, 3D simulations predict an $\\sim(L/M)^{0.9}$ scaling for K dwarfs, revealing tension between observations and first-principles convection models. EPRV asteroseismology extends into the mid-K regime and exposes a steep mode-amplitude scaling that our 3D convection simulations do not reproduce. This discrepancy points to missing physics in our implementation of convection-pulsation coupling and/or limitations in the adopted modeling assumptions, motivating further theoretical investigation.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.20985",
  "author_total": 24,
  "authors": [
    {
      "name": "T.L Campante"
    },
    {
      "name": "Y Zhou"
    },
    {
      "name": "Y Li"
    },
    {
      "name": "H Kjeldsen"
    },
    {
      "name": "R.R Costa"
    },
    {
      "name": "A.W Neitzel"
    },
    {
      "name": "J.H.C Martins"
    },
    {
      "name": "A.M Silva"
    },
    {
      "name": "V Adibekyan"
    },
    {
      "name": "J. Gomes da Silva"
    },
    {
      "name": "J.R Larsen"
    },
    {
      "name": "S.G Sousa"
    },
    {
      "name": "T.R Bedding"
    },
    {
      "name": "D Bossini"
    },
    {
      "name": "W.J Chaplin"
    },
    {
      "name": "E Corsaro"
    },
    {
      "name": "M.S Cunha"
    },
    {
      "name": "M Deal"
    },
    {
      "name": "D Huber"
    },
    {
      "name": "M.N Lund"
    },
    {
      "name": "M.S Lundkvist"
    },
    {
      "name": "T.S Metcalfe"
    },
    {
      "name": "M.J.P.F.G Monteiro"
    },
    {
      "name": "N.C Santos"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6kdv70b3nz6rn.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.20985",
  "fulltext_url": null,
  "id": "6kdv70b3nz6rn",
  "issns": [],
  "landing_url": "https://hal.science/hal-05842466v1",
  "language": "en",
  "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"
    ],
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.astr"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.20985",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-14",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6kdv70b3nz6rn.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:02Z",
      "native_id": "hal-05842466",
      "source": "hal",
      "url": "https://hal.science/hal-05842466v1"
    },
    {
      "first_seen": "2026-10-30T12:29:50Z",
      "native_id": "2610.20985",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.20985"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    },
    {
      "field": "physics",
      "origin": "hal:0.phys",
      "subfield": "general"
    }
  ],
  "title": "EPRV Asteroseismology of the K dwarfs GJ 570 A and GJ 783 A with ESPRESSO. Empirical mode-amplitude scaling in tension with 3D convection simulations",
  "title_text": "EPRV Asteroseismology of the K dwarfs GJ 570 A and GJ 783 A with ESPRESSO. Empirical mode-amplitude scaling in tension with 3D convection simulations",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:50Z",
  "url": "https://research.draconitic.com/paper/6kdv70b3nz6rn",
  "venue": "HAL",
  "versions": []
}