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Response to Comment on "A noninteracting low-mass black hole-giant star binary system".

Todd A Thompson1,2, Christopher S Kochanek3,2, Krzysztof Z Stanek3,2

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The study suggests the companion to a red giant star is likely a black hole, not a binary star system. This finding impacts our understanding of stellar evolution and compact object formation in binary systems.

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Area of Science:

  • Astrophysics
  • Stellar Astronomy
  • Compact Objects

Background:

  • The system 2MASS J05215658+4359220 features a red giant star with an unseen companion.
  • Previous interpretations proposed the companion could be a binary star system.

Purpose of the Study:

  • To re-evaluate the nature of the unseen companion in the 2MASS J05215658+4359220 system.
  • To determine the most plausible mass and composition of the companion object.

Main Methods:

  • Analysis of existing observational data for the 2MASS J05215658+4359220 system.
  • Modeling stellar masses and system configurations.

Main Results:

  • The data strongly favor a red giant mass of approximately 1.7 solar masses.
  • This mass implies the unseen companion is a black hole with an estimated mass of 5.3 solar masses.

Conclusions:

  • The companion to the red giant in 2MASS J05215658+4359220 is most likely a black hole.
  • This conclusion challenges previous hypotheses of a triple star system.