Erratum for the Report “The fastest unbound star in our Galaxy ejected by a thermonuclear supernova” by S. Geier, F. Fürst, E. Ziegerer, T. Kupfer, U. Heber, A. Irrgang, B. Wang, Z. Liu, Z. Han, B. Sesar, D. Levitan, R. Kotak, E. Magnier, K. Smith, W. S. Burgett, K. Chambers, H. Flewelling, N. Kaiser, R. Wainscoat, C. Waters

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Science  10 Jul 2015:
Vol. 349, Issue 6244, pp. aac9469
DOI: 10.1126/science.aac9469

In the Report “The fastest unbound star in our Galaxy ejected by a thermonuclear supernova,” a bug in a software script caused an error in the calculated values of RL. The main conclusions of the paper remain unchanged, but the estimated progenitor binary properties are modified. Corrected calculations now predict a rotational velocity fully consistent with the measured value and allow white dwarf masses up to the Chandrasekhar limit. The authors’ proposed scenario is now even more consistent with the observations, so the following text has been deleted from the paper: “However, assuming an ultracompact progenitor binary, the measured vrotsini of the He-sdO is still slower than expected by about a factor of four. A high loss of mass and angular momentum caused by the SN impact is predicted for main-sequence companions in the standard single-degenerate SN Ia scenario, in which mass is transferred from such a companion to a WD (2931). Though the loss of mass and angular momentum for a more compact companion like US 708 is expected to be smaller, our results indicate that it is still substantial. This puts important observational constraints on more detailed models.” The Supporting Online Materials have been updated to reflect the corrected values of RL. We are very grateful to Dr. Stephen Justham, who not only spotted the bug but also helped to resolve it.

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