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Peer-reviewedCC BY 4.0The Astrophysical Journal

Extremely Low Mass Ratio Contact Binaries. III. Photometric and Spectroscopic Investigations of 11 Systems

  • Youmo Lai1
  • Kai Li1,2
  • Raul Michel3
  • Difu Guo1
  • Liheng Wang1
  • Xiang Gao1
  • Han-ning Zhang1
  • Xing Gao4
  • Guo-You Sun5
5 affiliations
  1. 1Shandong University
  2. 2International Centre of Supernovae (ICESUN)
  3. 3Universidad Nacional Autónoma de México
  4. 4Xinjiang Astronomical Observatory
  5. 5Xingming Observatory
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Abstract

We present photometric and spectroscopic investigations of 11 totally eclipsing contact binaries with mass ratios below 0.15, classifying them as extremely low mass ratio contact binaries. The ground-based multiband light curves were modeled with PHysics Of Eclipsing BinariEs to derive the photometric parameters of these systems. The Transiting Exoplanet Survey Satellite (TESS) light curves of J011323 and J002747 show pronounced asymmetries and continuous variations. Markov Chain Monte Carlo modeling suggests that these variations are related to longitudinal migration of spots on the primary components. Spectral subtraction of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectra reveals excess chromospheric emission in six systems, while no detectable excess emission is found in the other five. The O − C analysis indicates secular period increases in six systems and secular decreases in five systems. We estimated their orbital angular momenta and performed a dynamical analysis. Within our adopted semianalytical framework without energy transfer, the formation of these observed systems requires additional angular momentum loss beyond saturated magnetic braking and gravitational radiation, but this requirement could be modified by different assumptions on mass transfer or radius evolution.

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Cite

BibTeXRIS
BibTeX
@article{lai2026extremely,
  title = {{Extremely Low Mass Ratio Contact Binaries. III. Photometric and Spectroscopic Investigations of 11 Systems}},
  author = {Youmo Lai and Kai Li and Raul Michel and Difu Guo and Liheng Wang and Xiang Gao and Han-ning Zhang and Xing Gao and Guo-You Sun},
  journal = {The Astrophysical Journal},
  year = {2026},
  month = oct,
  doi = {10.3847/1538-4357/ae9f44},
  url = {https://iopscience.iop.org/article/10.3847/1538-4357/ae9f44},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Extremely Low Mass Ratio Contact Binaries. III. Photometric and Spectroscopic Investigations of 11 Systems
AU  - Youmo Lai
AU  - Kai Li
AU  - Raul Michel
AU  - Difu Guo
AU  - Liheng Wang
AU  - Xiang Gao
AU  - Han-ning Zhang
AU  - Xing Gao
AU  - Guo-You Sun
PY  - 2026
DA  - 2026/10/15
JO  - The Astrophysical Journal
DO  - 10.3847/1538-4357/ae9f44
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/ae9f44
AB  - We present photometric and spectroscopic investigations of 11 totally eclipsing contact binaries with mass ratios below 0.15, classifying them as extremely low mass ratio contact binaries. The ground-based multiband light curves were modeled with PHysics Of Eclipsing BinariEs to derive the photometric parameters of these systems. The Transiting Exoplanet Survey Satellite (TESS) light curves of J011323 and J002747 show pronounced asymmetries and continuous variations. Markov Chain Monte Carlo modeling suggests that these variations are related to longitudinal migration of spots on the primary components. Spectral subtraction of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectra reveals excess chromospheric emission in six systems, while no detectable excess emission is found in the other five. The O − C analysis indicates secular period increases in six systems and secular decreases in five systems. We estimated their orbital angular momenta and performed a dynamical analysis. Within our adopted semianalytical framework without energy transfer, the formation of these observed systems requires additional angular momentum loss beyond saturated magnetic braking and gravitational radiation, but this requirement could be modified by different assumptions on mass transfer or radius evolution.
SN  - 0004-637X
SN  - 1538-4357
ER  -