http://arxiv.org/abs/2005.07653
van den Heuvel & Tauris argue that if the red giant star in the system 2MASS J05215658+4359220 has a mass of 1 solar mass (M$\odot$), then its unseen companion could be a binary composed of two 0.9 M$\odot$ stars, making a triple system. We contend that the existing data are most consistent with a giant of mass $3.2^{+1.0}{-1.0}$ M$\odot$, implying a black hole companion of $3.3^{+2.8}{-0.7}$ M$\odot$.
T. Thompson, C. Kochanek, K. Stanek, et. al.
Mon, 18 May 20
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Comments: 5 pages
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