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Peer-reviewedCC BY 4.0The Astronomical Journal

Shortest Period for Outer Orbit in Compact Hierarchical Triple? Discovery of SB1 Around V 885 Per

  • Mikhail Yu. Кoвaлёв Kovalev Mиxaил Юpьeвич1
  1. 1International Centre of Supernovae
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Abstract

I present a discovery of SB1 in the LAMOST-MRS spectra of eclipsing contact binary V 885 Per. Spectroscopic orbit has period only P = 21.8 days, which will make it shortest known outer period in compact hierarchical triple system, if this SB1 is indeed bound to the inner system. Unfortunately quality of available spectra do not allow to give definitive answer to this question, with other orbital hierarchy like 2+2 is also possible. Analysis of the eclipse timing variations showed a gradual increase in the orbital period of the inner eclipsing pair, as well as long-term changes that can be explained either by the light time travel effect due to an additional component or by magnetic activity.

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Cite

BibTeXRIS
BibTeX
@article{юpьeвич2026shortest,
  title = {{Shortest Period for Outer Orbit in Compact Hierarchical Triple? Discovery of SB1 Around V 885 Per}},
  author = {Mikhail Yu. Кoвaлёв Kovalev Mиxaил Юpьeвич},
  journal = {The Astronomical Journal},
  year = {2026},
  month = oct,
  doi = {10.3847/1538-3881/ae9f5b},
  url = {https://iopscience.iop.org/article/10.3847/1538-3881/ae9f5b},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Shortest Period for Outer Orbit in Compact Hierarchical Triple? Discovery of SB1 Around V 885 Per
AU  - Mikhail Yu. Кoвaлёв Kovalev Mиxaил Юpьeвич
PY  - 2026
DA  - 2026/10/13
JO  - The Astronomical Journal
DO  - 10.3847/1538-3881/ae9f5b
UR  - https://iopscience.iop.org/article/10.3847/1538-3881/ae9f5b
AB  - I present a discovery of SB1 in the LAMOST-MRS spectra of eclipsing contact binary V 885 Per. Spectroscopic orbit has period only P = 21.8 days, which will make it shortest known outer period in compact hierarchical triple system, if this SB1 is indeed bound to the inner system. Unfortunately quality of available spectra do not allow to give definitive answer to this question, with other orbital hierarchy like 2+2 is also possible. Analysis of the eclipse timing variations showed a gradual increase in the orbital period of the inner eclipsing pair, as well as long-term changes that can be explained either by the light time travel effect due to an additional component or by magnetic activity.
SN  - 0004-6256
SN  - 1538-3881
ER  -