Massive heartbeat stars from TESS. I. TESS sectors 1-16
Piotr Antoni Ko{\l}aczek-Szyma\'nski, Andrzej Pigulski, Gabriela, Michalska, Dawid Mo\'zdzierski, Tomasz R\'o\.za\'nski

TL;DR
This study identifies and analyzes 20 massive heartbeat star systems using TESS data, revealing their properties, tidal oscillations, and pulsations, and highlights the potential for probing massive star interiors and pulsation-binarity interactions.
Contribution
First comprehensive search for massive heartbeat stars using TESS data, including analysis of tidal oscillations and pulsations, and evaluation of analytical models for light curve fitting.
Findings
20 massive heartbeat systems identified, 7 with TEOs.
TEOs occur at harmonics of orbital frequencies, median at 9.
Most massive system is HD 5980 with ~150 M$_\
Abstract
Heartbeat stars are eccentric binaries exhibiting characteristic shape of brightness changes during periastron passage caused by tidal distortion of the components. Variable tidal potential can drive tidally excited oscillations (TEOs), which are usually gravity modes. Studies of heartbeat stars and TEOs open a new possibility to probe interiors of massive stars. There are only a few massive (masses of components M) systems of this type known. Using TESS data from the first 16 sectors, we searched for new massive heartbeat stars and TEOs using a sample of over 300 eccentric spectroscopic binaries. We analysed TESS 2-min and 30-min cadence data. Then, we fitted Kumar's analytical model to the light curves of stars showing heartbeats and performed times-series analysis of the residuals searching for TEOs and periodic intrinsic variability. We found 20 massive heartbeat…
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