The loudest stellar heartbeat: characterizing the most extreme amplitude heartbeat star system

Author:

Jayasinghe T12ORCID,Kochanek C S12,Strader J3,Stanek K Z12,Vallely P J12,Thompson Todd A12ORCID,Hinkle J T4ORCID,Shappee B J4,Dupree A K5,Auchettl K678,Chomiuk L3,Aydi E3,Dage K3910,Hughes A11,Shishkovsky L3,Sokolovsky K V312ORCID,Swihart S313,Voggel K T14,Thompson I B15

Affiliation:

1. Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA

2. Center for Cosmology and Astroparticle Physics, The Ohio State University, 191 W. Woodruff Avenue, Columbus, OH 43210, USA

3. Center for Data Intensive and Time Domain Astronomy, Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA

4. Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA

5. Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, MS-15, Cambridge, MA 02138, USA

6. School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia

7. ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Australia

8. Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA

9. Department of Physics, McGill University, 3600 University Street, Montréal, QC H3A 2T8, Canada

10. McGill Space Institute, McGill University, 3550 University Street, Montréal, QC H3A 2A7, Canada

11. Department of Astronomy/Steward Observatory, 933 North Cherry Avenue, Rm. N204, Tucson, AZ 85721-0065, USA

12. Sternberg Astronomical Institute, Moscow State University, Universitetskii pr. 13, 119992 Moscow, Russia

13. National Research Council Research Associate, National Academy of Sciences, Washington, DC 20001, USA

14. Universite de Strasbourg, CNRS, Observatoire Astronomique de Strasbourg, UMR 7550, F-67000 Strasbourg, France

15. Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101-1292, USA

Abstract

ABSTRACT We characterize the extreme heartbeat star system MACHO 80.7443.1718 in the Large Magellanic Cloud using Transiting Exoplanet Survey Satellite (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 $P_{\rm orb}=32.836\pm 0.008\, {\rm d}$. MACHO 80.7443.1718 is a young (∼6 Myr), massive binary, composed of a B0 Iae supergiant with $M_1 \simeq 35\, {\rm M}_\odot$ and an O9.5V secondary with $M_2 \simeq 16\, {\rm M}_\odot$ on an eccentric (e = 0.51 ± 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 disc. The disc rapidly dissipates at periastron that 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.

Funder

Gordon and Betty Moore Foundation

NSF

NASA

NSERC

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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