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
TLDR
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.Abstract:
We report the discovery of the closest known black hole candidate as a binary companion to V723 Mon. V723 Mon is a nearby ($d\sim460\,\rm pc$), bright ($V\simeq8.3$~mag), evolved ($T_{\rm eff, giant}\simeq4440$ K, $L_{\rm giant}\simeq173~L_\odot$ and $R_{\rm giant}\simeq22 ~R_\odot$) red giant in a high mass function, $f(M)=1.72\pm 0.01~M_\odot$, nearly circular binary ($P=59.9$ d, $e\simeq 0$). V723 Mon is a known variable star, previously classified as an eclipsing binary, but its ASAS, KELT, and TESS light curves are those of a nearly edge-on ellipsoidal variable. Detailed models of the light curves constrained by the period, radial velocities and stellar temperature give an inclination of $i=87.0^\circ \pm 1.0^\circ$, a mass ratio of $q\simeq0.30\pm0.02$, a companion mass of $M_{\rm comp}=2.91\pm0.08~M_\odot$, a stellar radius of $R_{\rm giant}=23.6\pm1.0~R_\odot$, and a giant mass of $M_{\rm giant}=0.87\pm0.08~ M_\odot$. We identify a likely non-stellar, diffuse veiling component with contributions in the $B$ and $V$-band of ${\sim}64\%$ and ${\sim}23\%$, respectively. The SED and the absence of continuum eclipses imply that the companion mass must be dominated by a compact object. We do observe eclipses of the Balmer lines when the dark companion passes behind the giant, but their velocity spreads are low compared to observed accretion disks. The X-ray luminosity of the system is $L_{\rm X}\simeq1.0\times10^{30}~\rm ergs~s^{-1}$, corresponding to $L/L_{\rm edd}{\sim}10^{-9}$.The simplest explanation for the massive companion is a single compact object, most likely a black hole in the "mass gap", although a double neutron star binary is possible.read more
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Discovery of One Neutron Star Candidate from Radial-velocity Monitoring
Hailong Yuan,Song Wang,Zhong-Gan Bai,Ye Wang,Yi-Ze Dong,Mengxin Wang,Si-Cheng Yu,Yong-Heng Zhao,Yaoquan Chu,Jifeng Liu,Haotong Zhang +10 more
TL;DR: In this paper , the authors reported the discovery of one possible neutron star binary (P orb = 0.8666 days) by using LAMOST low-resolution spectroscopic data.
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Search for dormant black holes in ellipsoidal variables - II. A binary modified minimum mass ratio
TL;DR: In this paper, a modified minimum mass ratio was proposed to detect a binary with a dormant black hole and a dormant neutron star, assuming that the primary fills its Roche lobe, which is a common assumption for binary detection.
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Binaries with Possible Compact Components Discovered from the LAMOST Time-domain Survey of Four K2 Plates
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Measuring interacting binary mass functions with X-ray fluorescence
TL;DR: In this article , the authors used binary geometry to determine the companion star's solid angle and deduce the iron line's equivalent width, and found that for systems with a mass ratio q ≥ 0.1, the expected Kα equivalent width is 2 −40eV.
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On the recurrence times of neutron star X-ray binary transients and the nature of the Galactic Centre quiescent X-ray binaries
Thomas J. Maccarone,Nathalie Degenaar,Bailey Tetarenko,Craig O. Heinke,Rudy Wijnands,Gregory R. Sivakoff +5 more
TL;DR: In this article , it was shown that about half of the known transient low-mass X-ray binaries with clear signatures for NS primaries have recurrence times in excess of a decade for outbursts at the sensitivity of MAXI.
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TL;DR: This is the first direct detection of gravitational waves and the first observation of a binary black hole merger, and these observations demonstrate the existence of binary stellar-mass black hole systems.
Journal ArticleDOI
emcee: The MCMC Hammer
TL;DR: The emcee algorithm as mentioned in this paper is a Python implementation of the affine-invariant ensemble sampler for Markov chain Monte Carlo (MCMC) proposed by Goodman & Weare (2010).
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Thirugnanasambandam,M. Thomas,P. Thomas,Jonathan E. Thompson,S. R. Thondapu,K. A. Thorne,Eric Thrane,C. L. Tinsman,T. R. Saravanan,Shubhanshu Tiwari,Shubhanshu Tiwari,Srishti Tiwari,V. Tiwari,K. Toland,M. Tonelli,Z. Tornasi,A. Torres-Forné,C. I. Torrie,I. Tosta e Melo,D. Töyrä,E. A. Trail,F. Travasso,G. Traylor,M. C. Tringali,A. Tripathee,A. Trovato,R. J. Trudeau,K. W. Tsang,M. Tse,R. Tso,L. Tsukada,D. Tsuna,T. Tsutsui,M. Turconi,A. S. Ubhi,K. Ueno,D. Ugolini,C. S. Unnikrishnan,A. L. Urban,S. A. Usman,A. C. Utina,H. Vahlbruch,G. Vajente,G. Valdes,Marica Valentini,N. van Bakel,M. van Beuzekom,J. F. J. van den Brand,J. F. J. van den Brand,C. Van Den Broeck,D. C. Vander-Hyde,L. van der Schaaf,J. V. Van Heijningen,A. A. van Veggel,M. Vardaro,V. Varma,S. Vass,M. Vasúth,Alberto Vecchio,G. Vedovato,John Veitch,P. J. Veitch,K. Venkateswara,G. Venugopalan,D. Verkindt,Doğa Veske,F. Vetrano,A. Viceré,A. D. Viets,S. Vinciguerra,D. J. Vine,J-Y. Vinet,Salvatore Vitale,Francisco Hernandez Vivanco,T. 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