학술논문
Planet Hunters TESS IV: A massive, compact hierarchical triple star system TIC 470710327
Document Type
Working Paper
Author
Eisner, Nora L.; Johnston, Cole; Toonen, Silvia; Frost, Abigail J.; Janssens, Soetkin; Lintott, Chris J.; Aigrain, Suzanne; Sana, Hugues; Abdul-Masih, Michael; Arellano-Córdova, Karla Z.; Beck, Paul G.; Bordier, Emma; Canon, Emily; Escorza, Ana; Fabry, Mattias; Hermansson, Lars; Howell, Steve; Miller, Grant; Sheyte, Shreeya; Alhassan, Safaa; Baeten, Elisabeth M. L.; Barnet, Frank; Bean, Stewart. J.; Bernau, Mikael; Bundy, David M.; Di Fraia, Marco Z.; Emralino, Francis M.; Goodwin, Brian L.; Hermes, Pete; Hoffman, Tony; Huten, Marc; Janíček, Roman; Lee, Sam; Mazzucato, Michele T.; Rogers, David J.; Rout, Michael P.; Sejpka, Johann; Tanner, Christopher; Terentev, Ivan A.; Urvoy, David
Source
Subject
Language
Abstract
We report the discovery and analysis of a massive, compact, hierarchical triple system (TIC 470710327) initially identified by citizen scientists in data obtained by NASA's Transiting Exoplanet Survey Satellite (TESS). Spectroscopic follow-up observations obtained with the HERMES spectrograph, combined with eclipse timing variations (ETVs), confirm that the system is comprised of three OB stars, with a compact 1.10 d eclipsing binary and a non-eclipsing tertiary on a 52.04 d orbit. Dynamical modelling of the system (from radial velocity and ETVs) reveal a rare configuration wherein the tertiary star (O9.5-B0.5V; 14-17 M$_{\odot}$) is more massive than the combined mass of the inner binary (10.9-13.2 M$_{\odot}$). Given the high mass of the tertiary, we predict that this system will undergo multiple phases of mass transfer in the future, and likely end up as a double neutron star gravitational wave progenitor or an exotic Thorne-Zytkow object. Further observational characterisation of this system promises constraints on both formation scenarios of massive stars as well as their exotic evolutionary end-products.
Comment: Accepted for publication in MNRAS (11 pages, 8 figures)
Comment: Accepted for publication in MNRAS (11 pages, 8 figures)