Work

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

Year: 2026

Type: article

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

Source: The Astrophysical Journal

DOI: 10.3847/1538-4357/aea560