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  The EXOTIME project: signals in the O–C diagrams of the rapidly pulsating subdwarfs DW Lyn, V1636 Ori, QQ Vir, and V541 Hya

Mackebrandt, F., Schuh, S., Silvotti, R., Kim, S.-L., Kilkenny, D., Green, E. M., et al. (2020). The EXOTIME project: signals in the O–C diagrams of the rapidly pulsating subdwarfs DW Lyn, V1636 Ori, QQ Vir, and V541 Hya. Astronomy and Astrophysics, 638: A108. doi:10.1051/0004-6361/201937172.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-9F4C-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-9F4D-2
Genre: Journal Article

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 Creators:
Mackebrandt, Felix1, 2, Author              
Schuh, Sonja1, Author              
Silvotti, R., Author
Kim, S.-L., Author
Kilkenny, D., Author
Green, E. M., Author
Lutz, R., Author
Nagel, T., Author
Provencal, J. L., Author
Otani, T., Author
Oswalt, T. D., Author
Benatti, S., Author
Lanteri, L., Author
Bonanno, A., Author
Frasca, A., Author
Janulis, R., Author
Paparó, M., Author
Molnár, L., Author
Claudi, R., Author
Østensen, R. H., Author
Affiliations:
1Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              
2IMPRS for Solar System Science at the University of Göttingen, Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1832290              

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Free keywords: stars: horizontal-branch / planets and satellites: detection / subdwarfs / asteroseismology / techniques: photometric
 Abstract: Aims. We aim to investigate variations in the arrival time of coherent stellar pulsations due to the light-travel time effect to test for the presence of sub-stellar companions. Those companions are the key to one possible formation scenario of apparently single sub-dwarf B stars. Methods. We made use of an extensive set of ground-based observations of the four large amplitude p-mode pulsators DW Lyn, V1636 Ori, QQ Vir, and V541 Hya. Observations of the TESS space telescope are available on two of the targets. The timing method compares the phase of sinusoidal fits to the full multi-epoch light curves with phases from the fit of a number of subsets of the original time series. Results. Observations of the TESS mission do not sample the pulsations well enough to be useful due to the (currently) fixed two-minute cadence. From the ground-based observations, we infer evolutionary parameters from the arrival times. The residual signals show many statistically significant periodic signals, but no clear evidence for changes in arrival time induced by sub-stellar companions. The signals can be explained partly by mode beating effects. We derive upper limits on companion masses set by the observational campaign.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1051/0004-6361/201937172
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Affiliations:
Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 638 Sequence Number: A108 Start / End Page: - Identifier: ISSN: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1