Low-amplitude Solar-like Oscillations in the K5 V Star ϵ Indi A
Article
Lundkvist, Mia S., Kjeldsen, Hans, Bedding, Timothy R., McCaughrean, Mark J., Butler, R. Paul, Slumstrup, Ditte, Campante, Tiago L., Aerts, Conny, Arentoft, Torben, Bruntt, Hans, Cardoso, Cátia V., Carrier, Fabien, Close, Laird M., da Silva, João Gomes, Kallinger, Thomas, King, Robert R., Li, Yaguang, Murphy, Simon J., Rørsted, Jakob L. and Stello, Dennis. 2024. "Low-amplitude Solar-like Oscillations in the K5 V Star ϵ Indi A." The Astrophysical Journal: an international review of astronomy and astronomical physics. 964 (2). https://doi.org/10.3847/1538-4357/ad25f2
| Article Title | Low-amplitude Solar-like Oscillations in the K5 V Star ϵ Indi A |
|---|---|
| ERA Journal ID | 1057 |
| Article Category | Article |
| Authors | Lundkvist, Mia S., Kjeldsen, Hans, Bedding, Timothy R., McCaughrean, Mark J., Butler, R. Paul, Slumstrup, Ditte, Campante, Tiago L., Aerts, Conny, Arentoft, Torben, Bruntt, Hans, Cardoso, Cátia V., Carrier, Fabien, Close, Laird M., da Silva, João Gomes, Kallinger, Thomas, King, Robert R., Li, Yaguang, Murphy, Simon J., Rørsted, Jakob L. and Stello, Dennis |
| Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
| Journal Citation | 964 (2) |
| Article Number | 110 |
| Number of Pages | 6 |
| Year | 2024 |
| Publisher | IOP Publishing |
| Place of Publication | United States |
| ISSN | 0004-637X |
| 1538-4357 | |
| Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-4357/ad25f2 |
| Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-4357/ad25f2 |
| Abstract | We have detected solar-like oscillations in the mid-K-dwarf epsilon 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 epsilon 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 | Asteroseismology; K dwarf stars; Radial velocity |
| Contains Sensitive Content | Does not contain sensitive content |
| ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
| Byline Affiliations | Aarhus University, Denmark |
| University of Sydney | |
| European Space Research and Technology Centre (ESTEC), Netherlands | |
| Carnegie Institution for Science, United States | |
| European Southern Observatory (ESO), Chile | |
| Diego Portales University, Chile | |
| University of Porto, Portugal | |
| Institute of Astronomy, Belgium | |
| University of Arizona, United States | |
| University of Vienna, Austria | |
| University of Exeter, United Kingdom | |
| University of Hawaii, United States | |
| Centre for Astrophysics | |
| University of New South Wales |
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