open access publication

Article, 2024

Low-amplitude Solar-like Oscillations in the K5 V Star ϵ Indi A

The Astrophysical Journal, ISSN 0004-637X, 1538-4357, Volume 964, 2, Page 110, 10.3847/1538-4357/ad25f2

Contributors

Lundkvist, Mia Sloth 0000-0002-8661-2571 (Corresponding author) [1] Kjeldsen, Hans 0000-0002-7055-5787 [1] Bedding, Timothy R 0000-0001-5222-4661 [2] Mccaughrean, Mark J 0000-0002-1452-5268 [3] Butler, R Paul 0000-0003-1305-3761 [4] Slumstrup, Ditte 0000-0003-4538-9518 [5] [6] Campante, Tiago L 0000-0002-4588-5389 [7] Aerts, Conny 0000-0003-1822-7126 [8] Arentoft, Torben 0000-0002-4696-6041 [1] Bruntt, Hans [1] Cardoso, Cátia V [9] Carrier, Fabien [8] Close, Laird Miller 0000-0002-2167-8246 [10] Da Silva, João Gomes 0000-0001-8056-9202 [7] Kallinger, Thomas 0000-0003-3627-2561 [11] King, Robert R 0000-0002-9573-2567 [12] [13] Li, Yaguang 0000-0003-3020-4437 [14] Murphy, Simon J 0000-0003-4932-7699 [15] Rørsted, Jakob Lysgaard [1] Stello, Dennis 0000-0002-4879-3519 [16]

Affiliations

  1. [1] Aarhus University
    2. [NORA names: AU Aarhus University; University; Denmark; Europe, EU; Nordic; OECD];
  2. [2] The University of Sydney
    3. [NORA names: Australia; Oceania; OECD];
  3. [3] European Space Research and Technology Centre
    4. [NORA names: Netherlands; Europe, EU; OECD];
  4. [4] Carnegie Institution for Science
    5. [NORA names: United States; America, North; OECD];
  5. [5] Diego Portales University
    6. [NORA names: Chile; America, South; OECD];

Abstract

We have detected solar-like oscillations in the mid-K-dwarf ϵ Indi A, making it the coolest dwarf to have measured oscillations. The star is noteworthy for harboring a pair of brown dwarf companions and a Jupiter-type planet. We observed ϵ Indi A during two radial velocity campaigns, using the high-resolution spectrographs HARPS (2011) and UVES (2021). Weighting the time series, we computed the power spectra and established the detection of solar-like oscillations with a power excess located at 5265 ± 110 μHz—the highest frequency solar-like oscillations so far measured in any star. The measurement of the center of the power excess allows us to compute a stellar mass of 0.782 ± 0.023 M ⊙ based on scaling relations and a known radius from interferometry. We also determine the amplitude of the peak power and note that there is a slight difference between the two observing campaigns, indicating a varying activity level. Overall, this work confirms that low-amplitude solar-like oscillations can be detected in mid-K-type stars in radial velocity measurements obtained with high-precision spectrographs.

Keywords

Indi A, Indies, Jupiter-type planets, UVES, activity, activity levels, amplitude, brown dwarf companions, campaign, center, companion, cool dwarfs, detect solar-like oscillations, detection, detection of solar-like oscillations, dwarf, dwarf companion, excess, harp, high-precision spectrographs, interferometry, levels, mass, measured oscillations, measurements, observational campaign, observations, oscillations, pairs, peak, peak power, planet, power, power spectrum, radial velocity measurements, radial-velocity campaign, radius, relations, scale, scaling relations, series, solar-like oscillations, spectra, spectrograph, spectrograph HARPS, stars, stellar mass, time, time series, velocity measurements

Funders

  • Danish Agency for Science and Higher Education
  • European Research Council
  • Danish National Research Foundation
  • Australian Research Council
  • European Union
  • Fundação para a Ciência e Tecnologia
  • The Velux Foundations

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