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SN 2019ehk: A Double-peaked Ca-rich Transient with Luminous X-Ray Emission and Shock-ionized Spectral Features

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  • Wynn V. Jacobson-Galan
  • Raffaella Margutti
  • Charles D. Kilpatrick
  • Daichi Hiramatsu
  • Hagai Perets
  • David Khatami
  • Ryan J. Foley
  • John Raymond
  • Sung-Chul Yoon
  • Alexey Bobrick
  • Yossef Zenati
  • Lluis Galbany
  • Jennifer Andrews
  • Peter J. Brown
  • Regis Cartier
  • Deanne L. Coppejans
  • Matthew Dobson
  • Aprajita Hajela
  • D. Andrew Howell
  • Hanindyo Kuncarayakti
  • Danny Milisavljevic
  • Mohammed Rahman
  • Cesar Rojas-Bravo
  • David J. Sand
  • Joel Shepherd
  • Stephen J. Smartt
  • Holland Stacey
  • Michael Stroh
  • Jonathan J. Swift
  • Giacomo Terreran
  • Jozsef Vinko
  • Xiaofeng Wang
  • Joseph P. Anderson
  • Edward A. Baron
  • Edo Berger
  • Peter K. Blanchard
  • Jamison Burke
  • David A. Coulter
  • Lindsay DeMarchi
  • James M. DerKacy
  • Christoffer Fremling
  • Sebastian Gomez
  • Mariusz Gromadzki
  • Griffin Hosseinzadeh
  • Daniel Kasen
  • Levente Kriskovics
  • Curtis McCully
  • Tomas E. Muller-Bravo
  • Matt Nicholl
  • Andras Ordasi
  • Craig Pellegrino
  • Anthony L. Piro
  • Andras Pal
  • Juanjuan Ren
  • Armin Rest
  • R. Michael Rich
  • Hanna Sai
  • Krisztian Sarneczky
  • Ken J. Shen
  • Philip Short
  • Matthew R. Siebert
  • Candice Stauffer
  • Robert Szakats
  • Xinhan Zhang
  • Jujia Zhang
  • Kaicheng Zhang
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Article number166
<mark>Journal publication date</mark>5/08/2020
<mark>Journal</mark>The Astrophysical Journal
Issue number2
Volume898
Publication StatusPublished
<mark>Original language</mark>English

Abstract

We present panchromatic observations and modeling of the Calcium-rich supernova (SN) 2019ehk in the starforming galaxy M100 (d≃16.2 Mpc) starting 10 hr after explosion and continuing for∼300 days. SN 2019ehk shows a double-peaked optical light curve peaking at tQ=Q3 and 15 days. The first peak is coincident with luminous, rapidly decaying Swift-XRTVdiscovered X-ray emission (Lx≃10 erg s- 41 -1at 3 days Lx∞t.3)