The Loudest Stellar Heartbeat: Characterizing the most extreme amplitude heartbeat star system

Abstract

We characterize the extreme heartbeat star system MACHO 80.7443.1718 in the LMC using TESS photometry and spectroscopic observations from the Magellan Inamori Kyocera Echelle (MIKE) and SOAR Goodman spectographs. MACHO 80.7443.1718 was first identified as a heartbeat star system in the All-Sky Automated Survey for SuperNovae (ASAS-SN) with $P_{\mathrm{orb}}=32.836\pm 0.008\mathrm{d}$. MACHO 80.7443.1718 is a young ($\sim 6$~Myr), massive binary, composed of a B0 Iae supergiant with $M_1\simeq 35M_{\odot }$ and an O9.5V secondary with $M_2\simeq 16M_{\odot }$ on an eccentric ($e=0.51\pm 0.03$) orbit. In addition to having the largest variability amplitude amongst all known heartbeats stars, MACHO 80.7443.1718 is also one of the most massive heartbeat stars yet discovered. The B[e] supergiant has Balmer emission lines and permitted/forbidden metallic emission lines associated with a circumstellar disk. The disk rapidly dissipates at periastron which could indicate mass transfer to the secondary, but re-emerges immediately following periastron passage. MACHO 80.7443.1718 also shows tidally excited oscillations at the $N=25$ and $N=41$ orbital harmonics and has a rotational period of 4.4 d.

21 pages, 16 figures. Submitted to MNRAS

References in corpus (22)

• Modules for Experiments in Stellar Astrophysics (MESA)
• The Transiting Exoplanet Survey Satellite
• The K2 Mission: Characterization and Early results
• HI4PI: A full-sky HI survey based on EBHIS and GASS
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• Achieving better than 1 minute accuracy in the Heliocentric and Barycentric Julian Dates
• An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent
• A Grid of NLTE Line-Blanketed Model Atmospheres of Early B-type Stars
• New Grids of ATLAS9 Model Atmospheres
• Physics Of Eclipsing Binaries. II. Towards the Increased Model Fidelity
• Paper II: Calibration of the Swift ultraviolet/optical telescope
• Heartbeat Stars, Tidally Excited Oscillations, and Resonance Locking
• The Joker: A custom Monte Carlo sampler for binary-star and exoplanet radial velocity data
• Instability strips of SPB and beta Cephei stars: the effect of the updated OP opacities and of the metal mixture
• Projected Rotational Velocities and Stellar Characterization of 350 B Stars in the Nearby Galactic Disk
• The Most Massive Heartbeat: An In-depth Analysis of ι Orionis
• KIC 8164262: a Heartbeat Star Showing Tidally Induced Pulsations with Resonant Locking
• Neutral material around the B[e] supergiant star LHA 115-S 65: An outflowing disk or a detached Keplerian rotating disk?
• Massive heartbeat stars from TESS. I. TESS sectors 1-16
• 1FGL J0523.5-2529: A New Probable Gamma-ray Pulsar Binary
• Tidally Excited Oscillations in Heartbeat Binary Stars: Pulsation Phases and Mode Identification
• $\epsilon$ Lupi: measuring the heartbeat of a doubly-magnetic massive binary with BRITE-Constellation

Cited by in corpus (15)

• TESS Eclipsing Binary Stars. I. Short cadence observations of 4584 eclipsing binaries in Sectors 1-26
• Applying the metallicity-dependent binary fraction to double white dwarf formation: Implications for LISA
• A New Window to Tidal Asteroseismology: Non-linearly Excited Stellar Eigenmodes and the Period Spacing Pattern in KOI-54
• Photometric Analysis of the OGLE Heartbeat Stars
• The OGLE Collection of Variable Stars. One Thousand Heartbeat Stars in the Galactic Bulge and Magellanic Clouds
• Tidal Wave Breaking in the Eccentric Lead-In to Mass Transfer and Common Envelope Phases
• Theoretical investigation of the occurrence of tidally excited oscillations in massive eccentric binary systems
• Detection of Tidally Excited Oscillations in Kepler Heartbeat Stars
• Exploring extreme brightness variations in blue supergiant MACHO 80.7443.1718: Evidence for companion-driven enhanced mass loss
• Strong Variability in AzV 493, an Extreme Oe-Type Star in the SMC
• Twenty-three New Heartbeat Star Systems Discovered Based on TESS Data
• KIC 7914906: An Eclipsing Heartbeat Star with Tidally Excited Oscillations and Gamma Doradus/Delta Scuti Hybrid Pulsations
• Heartbeat Stars Recognition Based on Recurrent Neural Networks: Method and Validation
• Orbital and Pulsation Analysis of 42 Heartbeat Stars Discovered in TESS Data
• Tidally excited oscillations in MACHO 80.7443.1718: Changing amplitudes and frequencies, high-frequency tidally excited mode, and a decrease in the orbital period