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Peer-reviewedCC BY 4.0The Astrophysical Journal

Asteroseismic Detection of a Massive Unseen Companion to the δ Scuti Star TIC 160582982

  • Chenglong Lv1,2
  • J. Pascual-Granado2
  • Ali Esamdin1,3
  • Angela Gardini2
  • Haozhi Wang4
  • Jianwei Yao1,3
  • Shuguo Ma1
4 affiliations
  1. 1Xinjiang Astronomical Observatory
  2. 2Instituto de Astrofísica de Andalucía—CSIC
  3. 3University of Chinese Academy of Sciences
  4. 4Chinese Academy of Sciences South America Center for Astronomy
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Abstract

We present TIC 160582982, an eccentric δ Scuti binary with a dynamically massive unseen companion. Six coherent high frequency pressure modes used as pulsation clocks yield a phase modulation orbit with P orb = 89.29 ± 0.19 days, e = 0.53 9 − 0.037 + 0.040 , and a 1 sin i / c = 145 . 6 − 3.4 + 3.7 s , corresponding to K 1 = 42 . 2 − 1.8 + 2.2 km s − 1 and f ( M ) = 0.41 6 − 0.028 + 0.032 M ⊙ . An independent frequency-modulation analysis of the two strongest modes gives a consistent orbital solution. Rotating MIST isochrones constrained by the atmospheric parameters and spectral energy distribution (SED) give M ₁ = 1.93 ± 0.19 M ⊙ and R ₁ = 2.65 ± 0.23 R ⊙ . The mass function implies a formal edge-on minimum companion mass of approximately 1.80 M ⊙ . Assuming a luminous main-sequence companion and including the noneclipsing geometry gives M 2 = 2.1 9 − 0.34 + 1.24 M ⊙ and i = 61 . 5 − 19.6 + 16.6 deg . However, no clear evidence for the presence of a luminous counterpart is found, either photometrically or spectroscopically. This suggests the presence of a massive compact object, such as a neutron star or even a stellar-mass black hole, as the massive unseen binary companion. Future phase resolved high resolution spectroscopy will be crucial for obtaining an independent orbital constraint and clarifying the nature of the companion.

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Cite

BibTeXRIS
BibTeX
@article{lv2026asteroseismic,
  title = {{Asteroseismic Detection of a Massive Unseen Companion to the δ Scuti Star TIC 160582982}},
  author = {Chenglong Lv and J. Pascual-Granado and Ali Esamdin and Angela Gardini and Haozhi Wang and Jianwei Yao and Shuguo Ma},
  journal = {The Astrophysical Journal},
  year = {2026},
  month = oct,
  doi = {10.3847/1538-4357/aea560},
  url = {https://iopscience.iop.org/article/10.3847/1538-4357/aea560},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Asteroseismic Detection of a Massive Unseen Companion to the δ Scuti Star TIC 160582982
AU  - Chenglong Lv
AU  - J. Pascual-Granado
AU  - Ali Esamdin
AU  - Angela Gardini
AU  - Haozhi Wang
AU  - Jianwei Yao
AU  - Shuguo Ma
PY  - 2026
DA  - 2026/10/16
JO  - The Astrophysical Journal
DO  - 10.3847/1538-4357/aea560
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/aea560
AB  - We present TIC 160582982, an eccentric δ Scuti binary with a dynamically massive unseen companion. Six coherent high frequency pressure modes used as pulsation clocks yield a phase modulation orbit with P orb = 89.29 ± 0.19 days, e = 0.53 9 − 0.037 + 0.040 , and a 1 sin i / c = 145 . 6 − 3.4 + 3.7 s , corresponding to K 1 = 42 . 2 − 1.8 + 2.2 km s − 1 and f ( M ) = 0.41 6 − 0.028 + 0.032 M ⊙ . An independent frequency-modulation analysis of the two strongest modes gives a consistent orbital solution. Rotating MIST isochrones constrained by the atmospheric parameters and spectral energy distribution (SED) give M ₁ = 1.93 ± 0.19 M ⊙ and R ₁ = 2.65 ± 0.23 R ⊙ . The mass function implies a formal edge-on minimum companion mass of approximately 1.80 M ⊙ . Assuming a luminous main-sequence companion and including the noneclipsing geometry gives M 2 = 2.1 9 − 0.34 + 1.24 M ⊙ and i = 61 . 5 − 19.6 + 16.6 deg . However, no clear evidence for the presence of a luminous counterpart is found, either photometrically or spectroscopically. This suggests the presence of a massive compact object, such as a neutron star or even a stellar-mass black hole, as the massive unseen binary companion. Future phase resolved high resolution spectroscopy will be crucial for obtaining an independent orbital constraint and clarifying the nature of the companion.
SN  - 0004-637X
SN  - 1538-4357
ER  -