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The type II-plateau Supernova 2017eaw in NGC 6946 and its red supergiant progenitor.

Van Dyk, Schuyler D. and Zheng, WeiKang and Maund, Justyn R. and Brink, Thomas G. and Srinivasan, Sundar and Andrews, Jennifer E. and Smith, Nathan and Leonard, Douglas C. and Morozova, Viktoriya and Filippenko, Alexei V. and Conner, Brody and Milisavljevic, Dan and de Jaeger, Thomas and Long, Knox S. and Isaacson, Howard and Crossfield, Ian J. M. and Kosiarek, Molly R. and Howard, Andrew W. and Fox, Ori D. and Kelly, Patrick L. and Piro, Anthony L. and Littlefair, Stuart P. and Dhillon, Vik S. and Wilson, Richard and Butterley, Timothy and Yunus, Sameen and Channa, Sanyum and Jeffers, Benjamin T. and Falcon, Edward and Ross, Timothy W. and Hestenes, Julia C. and Stegman, Samantha M. and Zhang, Keto and Kumar, Sahana (2019) 'The type II-plateau Supernova 2017eaw in NGC 6946 and its red supergiant progenitor.', Astrophysical journal., 875 (2). p. 136.


We present extensive optical photometric and spectroscopic observations, from 4 to 482 days after explosion, of the Type II-plateau (II-P) supernova (SN) 2017eaw in NGC 6946. SN 2017eaw is a normal SN II-P intermediate in properties between, for example, SN 1999em and SN 2012aw and the more luminous SN 2004et, also in NGC 6946. We have determined that the extinction to SN 2017eaw is primarily due to the Galactic foreground and that the SN site metallicity is likely subsolar. We have also independently confirmed a tip-of-the-red-giant-branch (TRGB) distance to NGC 6946 of 7.73 ± 0.78 Mpc. The distances to the SN that we have also estimated via both the standardized candle method and expanding photosphere method corroborate the TRGB distance. We confirm the SN progenitor identity in pre-explosion archival Hubble Space Telescope (HST) and Spitzer Space Telescope images, via imaging of the SN through our HST Target of Opportunity program. Detailed modeling of the progenitor’s spectral energy distribution indicates that the star was a dusty, luminous red supergiant consistent with an initial mass of ∼15 Me.

Item Type:Article
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Publisher statement:© 2019. The American Astronomical Society. All rights reserved.
Date accepted:12 March 2019
Date deposited:06 June 2019
Date of first online publication:24 April 2019
Date first made open access:06 June 2019

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