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The Type II-plateau Supernova 2017eaw in NGC 6946 and Its Red Supergiant Progenitor

Van Dyk, Schuyler D.; Zheng, WeiKang; Maund, Justyn R.; Brink, Thomas G.; Srinivasan, Sundar; Andrews, Jennifer E.; Smith, Nathan; Leonard, Douglas C.; Morozova, Viktoriya; Filippenko, Alexei V.; Conner, Brody; Milisavljevic, Dan; de Jaeger, Thomas; Long, Knox S.; Isaacson, Howard; Crossfield, Ian J.M.; Kosiarek, Molly R.; Howard, Andrew W.; Fox, Ori D.; Kelly, Patrick L.; Piro, Anthony L.; Littlefair, Stuart P.; Dhillon, Vik S.; Wilson, Richard; Butterley, Timothy; Yunus, Sameen; Channa, Sanyum; Jeffers, Benjamin T.; Falcon, Edward; Ross, Timothy W.; Hestenes, Julia C.; Stegman, Samantha M.; Zhang, Keto; Kumar, Sahana

The Type II-plateau Supernova 2017eaw in NGC 6946 and Its Red Supergiant Progenitor Thumbnail


Schuyler D. Van Dyk

WeiKang Zheng

Justyn R. Maund

Thomas G. Brink

Sundar Srinivasan

Jennifer E. Andrews

Nathan Smith

Douglas C. Leonard

Viktoriya Morozova

Alexei V. Filippenko

Brody Conner

Dan Milisavljevic

Thomas de Jaeger

Knox S. Long

Howard Isaacson

Ian J.M. Crossfield

Molly R. Kosiarek

Andrew W. Howard

Ori D. Fox

Patrick L. Kelly

Anthony L. Piro

Stuart P. Littlefair

Vik S. Dhillon

Richard Wilson

Sameen Yunus

Sanyum Channa

Benjamin T. Jeffers

Edward Falcon

Timothy W. Ross

Julia C. Hestenes

Samantha M. Stegman

Keto Zhang

Sahana Kumar


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.


Van Dyk, S. D., Zheng, W., Maund, J. R., Brink, T. G., Srinivasan, S., Andrews, J. E., …Kumar, S. (2019). The Type II-plateau Supernova 2017eaw in NGC 6946 and Its Red Supergiant Progenitor. Astrophysical Journal, 875(2), Article 136.

Journal Article Type Article
Acceptance Date Mar 12, 2019
Online Publication Date Apr 24, 2019
Publication Date Apr 30, 2019
Deposit Date Jun 6, 2019
Publicly Available Date Jun 6, 2019
Journal Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 875
Issue 2
Article Number 136


Published Journal Article (3.9 Mb)

Copyright Statement
© 2019. The American Astronomical Society. All rights reserved.

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