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Scientific paper - Original scientific paper
KIC 7955301: A hierarchical triple system with eclipse timing variations and an oscillating red giant
Astronomy & Astrophysics, 668 (2022); A173. https://doi.org/10.1051/0004-6361/202244373
Gaulme, Patrick; Borkovits, Tamás; Appourchaux, Thierry; Pavlovski, Krešimir; Spada, Federico; Gehan, Charlotte; Ong, Joel; Miglio, Andrea; Tkachenko, Andrew; Mosser, Benoît; Vrard, Mathieu; Benbakoura, Mansour; Drew Chojnowski, Stephen; Perkins, Jean; Hedlund, Anne; Jackiewicz, Jason More authors...

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Gaulme, P., Borkovits, T., Appourchaux, T., Pavlovski, K., Spada, F., Gehan, C. ... Jackiewicz, J. (2022). KIC 7955301: A hierarchical triple system with eclipse timing variations and an oscillating red giant. Astronomy & Astrophysics, 668.. doi: 10.1051/0004-6361/202244373

Gaulme, Patrick, et al. "KIC 7955301: A hierarchical triple system with eclipse timing variations and an oscillating red giant." Astronomy & Astrophysics, vol. 668, 2022. https://doi.org/10.1051/0004-6361/202244373

Gaulme, Patrick, Tamás Borkovits, Thierry Appourchaux, Krešimir Pavlovski, Federico Spada, Charlotte Gehan, Joel Ong, et al. "KIC 7955301: A hierarchical triple system with eclipse timing variations and an oscillating red giant." Astronomy & Astrophysics 668 (2022). https://doi.org/10.1051/0004-6361/202244373

Gaulme, P., et al. (2022) 'KIC 7955301: A hierarchical triple system with eclipse timing variations and an oscillating red giant', Astronomy & Astrophysics, 668. doi: 10.1051/0004-6361/202244373

Gaulme P, Borkovits T, Appourchaux T, Pavlovski K, Spada F, Gehan C, and sur.. KIC 7955301: A hierarchical triple system with eclipse timing variations and an oscillating red giant. Astronomy & Astrophysics [Internet]. 2022 December 19 [cited 2024 August 03];668. doi: 10.1051/0004-6361/202244373

P. Gaulme, et al., "KIC 7955301: A hierarchical triple system with eclipse timing variations and an oscillating red giant", Astronomy & Astrophysics, vol. 668, December 2022. [Online]. Available at: https://urn.nsk.hr/urn:nbn:hr:217:175487. [Accessed: 03 August 2024]

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Metadata
Title (english)KIC 7955301: A hierarchical triple system with eclipse timing variations and an oscillating red giant
AuthorPatrick Gaulme
AuthorTamás Borkovits
AuthorThierry Appourchaux
AuthorKrešimir Pavlovski
AuthorFederico Spada
AuthorCharlotte Gehan
AuthorJoel Ong
AuthorAndrea Miglio
AuthorAndrew Tkachenko
AuthorBenoît Mosser
AuthorMathieu Vrard
AuthorMansour Benbakoura
AuthorStephen Drew Chojnowski
AuthorJean Perkins
AuthorAnne Hedlund
AuthorJason Jackiewicz
Author's institutionUniversity of Zagreb
Faculty of Science
(Department of Physics)
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Physics
Abstract (english)
KIC 7955301 is a hierarchical triple system with clear eclipse timing and depth variations that was discovered by the Kepler satellite during its original mission. It is composed of a non-eclipsing primary star at the bottom of the red giant branch (RGB) on a 209-dayorbit with a K/G-type main-sequence (MS) inner eclipsing binary (EB), orbiting in 15.3 days. This system was noted for the large amplitude of its eclipse timing variations (ETVs, over 4 h), and the detection of clear solar-like oscillations of the red-giant (RG)component, including p-modes of degree up to l=3 and mixed l=1 modes. The system is a single-lined spectroscopic triple, meaning that only spectral lines from the RG are detected. We performed a dynamical model by combining the 4-year-longKeplerphotometric data, ETVs, and radial-velocity data obtained with the high-resolution spectrometers ARCES, of the 3.5 m ARC telescope at Apache Point observatory, and SOPHIE, of the 1.93 m telescope at Haute-Provence Observatory. The “dynamical” mass of the RG component was determined with a 2% precision at 1.30+0.03−0.02 Msun. We performed asteroseismic modeling based on the global seismicparameters and on the individual frequencies. Both methods provide an estimate of the mass of the RG that matches the dynamical mass within the uncertainties. Asteroseismology also revealed the rotation rate of the core (≈15 days), the envelope (∼150 days), and the inclination (∼75 deg.) of the RG. Three different approaches led to an estimation of the age between 3.3 and 5.8 Gyr, which highlights the difficulty of determining stellar ages despite the exceptional wealth of information available for this system. On short time scales, the inner binary exhibits eclipses with varying depths during a 7.3-year long interval, and no eclipses during the consecutive 11.9 years.This is why Kepler could detect its eclipses but TESS cannot, and the future ESA PLATO mission should detect these. In the long term, the system appears to be stable and owes its evolution to the evolution of its individual components. This triple system could end its current smooth evolution by merging by the end of the RGB of the primary star because the periastron distance is ≈142 Rsun, which is close to the expected radius of the RG at the tip of the RGB
Keywords (croatian)
Languageenglish
Publication typeScientific paper - Original scientific paper
Publication statusPublished
Peer reviewPeer review - international
Publication versionPublished version
Journal titleAstronomy & Astrophysics
Numberingvol. 668, A173
p-ISSN0004-6361
e-ISSN1432-0746
DOIhttps://doi.org/10.1051/0004-6361/202244373
URN:NBNurn:nbn:hr:217:175487
Publication2022-12-19
Document URLhttps://www.aanda.org/10.1051/0004-6361/202244373
Type of resourceText
Access conditionsOpen access
Terms of useLicence Attribution 4.0 International (CC BY 4.0) icon
Public note© The Authors 2022. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. This article is published in open access under the Subscribe-to-Open model. Open access funding provided by Max Planck Society. Received 28 June 2022. Accepted 6 October 2022. Published online 19 December 2022.
Created on2024-08-03 10:43:11