A naked-eye triple system with a nonaccreting black hole in the inner binary
TLDR
In this article, it was shown that HR 6819 is a hierarchical triple, consisting of a B3 III star and an unseen companion in a circular orbit with a radial-velocity semi-amplitude of 61.3 km s−1 of the inner star and its minimum (probable) mass of 5.0 M ⊙ (6.3Abstract:
Several dozen optical echelle spectra demonstrate that HR 6819 is a hierarchical triple. A classical Be star is in a wide orbit with an unconstrained period around an inner 40 d binary consisting of a B3 III star and an unseen companion in a circular orbit. The radial-velocity semi-amplitude of 61.3 km s−1 of the inner star and its minimum (probable) mass of 5.0 M ⊙ (6.3 ± 0.7 M ⊙ ) imply a mass of the unseen object of ≥4.2 M ⊙ (≥5.0 ± 0.4 M ⊙ ), that is, a black hole (BH). The spectroscopic time series is stunningly similar to observations of LB-1. A similar triple-star architecture of LB-1 would reduce the mass of the BH in LB-1 from ∼70 M ⊙ to a level more typical of Galactic stellar remnant BHs. The BH in HR 6819 probably is the closest known BH to the Sun, and together with LB-1, suggests a population of quiet BHs. Its embedment in a hierarchical triple structure may be of interest for models of merging double BHs or BH + neutron star binaries. Other triple stars with an outer Be star but without BH are identified; through stripping, such systems may become a source of single Be stars.read more
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Journal ArticleDOI
The "hidden" companion in LB-1 unveiled by spectral disentangling
Tomer Shenar,J. Bodensteiner,Michael Abdul-Masih,M. Fabry,Laurent Mahy,Pablo Marchant,G. Banyard,Dominic M. Bowman,K. Dsilva,C. Hawcroft,Maddalena Reggiani,Hugues Sana +11 more
TL;DR: In this article, the authors performed an orbital analysis and spectral disentangling of LS V +22 25 (LB-1) to elucidate the nature of the system, which revealed that LB-1 contains two components of comparable brightness in the optical.
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A unicorn in monoceros: the 3 M ⊙ dark companion to the bright, nearby red giant V723 Mon is a non-interacting, mass-gap black hole candidate
Tharindu Jayasinghe,K. Z. Stanek,Todd A. Thompson,Christopher S. Kochanek,D. M. Rowan,Patrick J. Vallely,Klaus G. Strassmeier,Michael Weber,Jason T. Hinkle,Franz-Josef Hambsch,David V. Martin,J. L. Prieto,J. L. Prieto,Thallis L. Pessi,Daniel Huber,Katie Auchettl,Katie Auchettl,Laura A. Lopez,Ilya Ilyin,Carles Badenes,Andrew W. Howard,Howard Isaacson,Howard Isaacson,Simon J. Murphy,Simon J. Murphy +24 more
TL;DR: The closest known black hole candidate as a binary companion to V723 Mon was discovered in this paper, where the authors used the SED and the absence of continuum eclipses to identify a likely non-stellar, diffuse veiling component with contributions in the $B$ and $V$-band.
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A new channel to form IMBHs throughout cosmic time
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Journal ArticleDOI
A stripped-companion origin for Be stars: clues from the putative black holes HR 6819 and LB-1
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TL;DR: In this paper, the authors disentangle the observed composite spectra into two components: a rapidly rotating Be star and a slowly rotating B star with low surface gravity, and show that the system is a binary and does not contain a detached black hole.
Journal ArticleDOI
The 'hidden' companion in LB-1 unveiled by spectral disentangling
Tomer Shenar,J. Bodensteiner,Michael Abdul-Masih,M. Fabry,Laurent Mahy,Pablo Marchant,G. Banyard,Dominic M. Bowman,K. Dsilva,C. Hawcroft,Maddalena Reggiani,Hugues Sana +11 more
TL;DR: In this article, the authors performed an orbital analysis and spectral disentangling of LS V +22 25 (LB-1) to elucidate the nature of the system, which revealed that LB-1 contains two components of comparable brightness in the optical.
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Dolding,P. Drazinos,J. Durán,B. Edvardsson,H. Enke,K. Eriksson,P. Esquej,G. Eynard Bontemps,C. Fabre,M. Fabrizio,S. Faigler,A. J. Falcão,M. Farràs Casas,L. Federici,Grigori Fedorets,P. Fernique,F. Figueras,Francesco Filippi,K. Findeisen,A. Fonti,E. Fraile,Morgan Fraser,B. Frézouls,Mario Gai,S. Galleti,D. Garabato,F. García-Sedano,A. Garofalo,N. Garralda,A. Gavel,P. Gavras,J. Gerssen,R. Geyer,P. Giacobbe,Gerard Gilmore,S. Girona,G. Giuffrida,F. Glass,M. Gomes,Mikael Granvik,A. Gueguen,A. Guerrier,J. Guiraud,R. Gutiérrez-Sánchez,R. Haigron,Despina Hatzidimitriou,M. Hauser,M. Haywood,Ulrike Heiter,Amina Helmi,J. Heu,Thomas Hilger,David Hobbs,Werner Hofmann,G. Holland,H. E. Huckle,A. Hypki,V. Icardi,K. Janßen,G. Jevardat de Fombelle,Peter G. Jonker,Attila Juhasz,F. Julbe,A. Karampelas,A. Kewley,Joakim Klar,A. Kochoska,R. Kohley,K. Kolenberg,M. Kontizas,E. Kontizas,Sergey E. Koposov,Georges Kordopatis,Z. Kostrzewa-Rutkowska,P. Koubsky,Sébastien Lambert,Antonino F. Lanza,Y. Lasne,J.-B. Lavigne,Y. Le Fustec,C. Le Poncin-Lafitte,Yveline Lebreton,S. Leccia,N. Leclerc,I. Lecoeur-Taïbi,H. Lenhardt,F. Leroux,S. Liao,E. Licata,H. E. P. Lindstrøm,T. A. Lister,E. Livanou,A. Lobel,M. López,S. Managau,Robert G. Mann,G. Mantelet,O. Marchal,Jon Marchant,Marcella Marconi,S. Marinoni,G. Marschalkó,D. J. Marshall,M. Martino,Gábor Marton,Nicolas Mary,Davide Massari,G. Matijevič,Tsevi Mazeh,Paul J. McMillan,S. Messina,D. Michalik,N. R. Millar,D. Molina,R. Molinaro,L. Molnár,P. Montegriffo,R. Mor,R. Morbidelli,Thierry Morel,D. Morris,A. F. Mulone,T. Muraveva,I. Musella,Gijs Nelemans,Luciano Nicastro,L. Noval,W. O'Mullane,C. Ordénovic,D. Ordóñez-Blanco,P. Osborne,C. Pagani,I. Pagano,F. Pailler,H. Palacin,L. Palaversa,A. Panahi,Michał Pawlak,A. M. Piersimoni,F.-X. Pineau,E. Plachy,G. Plum,E. Poggio,E. Poujoulet,A. Prša,L. Pulone,E. Racero,S. Ragaini,N. Rambaux,M. Ramos-Lerate,S. Regibo,Céline Reylé,F. Riclet,V. Ripepi,A. Riva,A. Rivard,G. Rixon,T. Roegiers,M. Roelens,M. Romero-Gómez,Nicholas Rowell,F. Royer,L. Ruiz-Dern,G. Sadowski,T. Sagristà Sellés,Johannes Sahlmann,J. Salgado,E. Salguero,Nicoletta Sanna,Toni Santana-Ros,M. Sarasso,H. Savietto,M. Schultheis,Eva Sciacca,M. Segol,J. C. Segovia,Damien Ségransan,I.-C. Shih,L. Siltala,A. F. Silva,Richard L. Smart,K. W. Smith,E. Solano,F. Solitro,R. Sordo,Sonia Nieto,J. Souchay,A. Spagna,Federica Spoto,U. Stampa,Iain A. Steele,H. Steidelmüller,C. A. Stephenson,H. Stoev,F. F. Suess,Jean Surdej,Laszlo Szabados,E. Szegedi-Elek,D. Tapiador,F. Taris,G. Tauran,M. B. Taylor,Ramachrisna Teixeira,D. Terrett,P. Teyssandier,W. Thuillot,A. Titarenko,F. Torra Clotet,C. Turon,A. Ulla,E. Utrilla,S. Uzzi,M. Vaillant,G. Valentini,V. Valette,A. van Elteren,E. Van Hemelryck,M. van Leeuwen,M. Vaschetto,Alberto Vecchiato,Jovan Veljanoski,Y. Viala,D. Vicente,Steven S. Vogt,C. von Essen,H. Voss,V. Votruba,S. Voutsinas,G. Walmsley,M. Weiler,O. Wertz,T. Wevers,Łukasz Wyrzykowski,A. Yoldas,M. Žerjal,H. Ziaeepour,J. Zorec,Sven Zschocke,Shay Zucker,C. Zurbach,T. Zwitter +452 more