A noninteracting low-mass black hole–giant star binary system

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

Black hole binary systems with companion stars are typically found via their x-ray emission, generated by interaction and accretion. Noninteracting binaries are expected to be plentiful in the Galaxy but must be observed using other methods. We combine radial velocity and photometric variability data to show that the bright, rapidly rotating giant star 2MASS J05215658+4359220 is in a binary system with a massive unseen companion. The system has an orbital period of ~83 days and near-zero eccentricity. The photometric variability period of the giant is consistent with the orbital period, indicating star spots and tidal synchronization. Constraints on the giant’s mass and radius imply that the unseen companion is 3:3þ - 2 0 : : 8 7 solar masses, indicating that it is a noninteracting low-mass black hole or an unexpectedly massive neutron star.

Detaljer

Författare
  • Todd A. Thompson
  • Christopher S. Kochanek
  • Krzysztof Z. Stanek
  • Carles Badenes
  • Richard S. Post
  • Tharindu Jayasinghe
  • David W. Latham
  • Allyson Bieryla
  • Gilbert A. Esquerdo
  • Perry Berlind
  • Michael L. Calkins
  • Jamie Tayar
  • Lennart Lindegren
  • Jennifer A. Johnson
  • Thomas W.S. Holoien
  • Katie Auchettl
  • Kevin Covey
Enheter & grupper
Externa organisationer
  • Ohio State University
  • Institute for Advanced Study, Princeton
  • University of Pittsburgh
  • University of Barcelona
  • Harvard–Smithsonian Center for Astrophysics
  • University of Hawaii at Manoa
  • Carnegie Observatories
  • Western Washington University
  • Post Observatory, Lexington
  • University of Copenhagen
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Astronomi, astrofysik och kosmologi
Originalspråkengelska
Sidor (från-till)637-640
Antal sidor4
TidskriftScience
Volym366
Utgåva nummer6465
StatusPublished - 2019
PublikationskategoriForskning
Peer review utfördJa