Journal Article

Tycho-B: an unlikely companion for SN 1572

W E Kerzendorf, Knox S Long, P Frank Winkler and Tuan Do

in Monthly Notices of the Royal Astronomical Society

Published on behalf of Royal Astronomical Society

Volume 479, issue 4, pages 5696-5703
ISSN: 0035-8711
Published online July 2018 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1093/mnras/sty1863

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ABSTRACT

If some or all Type Ia SNe arise from accretion onto a massive WD from a companion, then the companion will remain in some form after the SN explosion. Tycho-B is an unusual, relatively hot star along the line of sight to Tycho’s SNR – conclusively shown to be a Type Ia – and has been suggested as such a companion. If the interior of Tycho’s SNR contains unshocked Fe, and if Tycho-B is either within the SNR shell or in the background, then one might hope to see evidence of this in the UV spectrum. Such is the case for SN 1006, where spectra of the background Schweizer–Middleditch star, as well as two AGNs, show broad absorption lines of Fe II. To test this idea, we have used STIS on HST to obtain a UV spectrum of Tycho-B. The observed spectrum, however, shows no evidence of Fe II absorption. Furthermore, a luminosity distance estimate using UV and optical spectra of Tycho-B suggests that the star is consistent with a foreground interloper. We conclude either that Tycho-B is nearer than Tycho’s SNR, or that all of the Fe in the interior of Tycho’s SNR is more highly ionized.

Keywords: binaries: symbiotic; supernovae: individual: SN1572; ISM: supernova remnants

Journal Article.  4029 words.  Illustrated.

Subjects: Astronomy and Astrophysics