Discovery of an Intermediate-luminosity Red Transient in M51 and Its Likely Dust-obscured, Infrared-variable Progenitor

  title={Discovery of an Intermediate-luminosity Red Transient in M51 and Its Likely Dust-obscured, Infrared-variable Progenitor},
  author={Jacob E. Jencson and S. M. Adams and Howard E. Bond and Schuyler D. van Dyk and Mansi M. Kasliwal and John Bally and Nadejda Blagorodnova and Kishalay De and Christoffer U. Fremling and Yuhan Yao and A. S. Fruchter and David Rubin and Cristina Barbarino and Jesper Sollerman and Adam A. Miller and E. K. S. Hicks and Matthew A. Malkan and Igor Andreoni and Eric C. Bellm and Robert K. Buchheim and Richard Dekany and Michael Feeney and Sara Frederick and Avishay Gal-yam and Robert D. Gehrz and Matteo Giomi and Matthew J. Graham and Wayne Green and David D. S. Hale and Matthew J. Hankins and Mark Hanson and George Helou and Anna Y. Q. Ho and T. Hung and Mario Juri'c and Malhar R. Kendurkar and Shrinivas R. Kulkarni and Ryan M. Lau and Frank J. Masci and James D. Neill and Kevin C. Quin and Reed L. Riddle and Ben Rusholme and F. Sims and Nathan Smith and Roger M. Smith and Maayane T. Soumagnac and Yutaro Tachibana and Samaporn Tinyanont and R. Walters and Stanley Watson and Robert E. Williams},
  journal={The Astrophysical Journal},
  • J. Jencson, S. Adams, +49 authors Robert E. Williams
  • Published 15 April 2019
  • Physics
  • The Astrophysical Journal
We present the discovery of an optical transient (OT) in Messier 51, designated M51 OT2019-1 (also ZTF 19aadyppr, AT 2019abn, ATLAS19bzl), by the Zwicky Transient Facility (ZTF). The OT rose over 15 days to an observed plateau luminosity of $M_r=-13$, in the luminosity gap between novae and supernovae (SNe). The spectral sequence shows a red continuum, prominent Balmer emission with a velocity width of $\approx400$ km s$^{-1}$, Ca II and [Ca II] emission, and absorption features (Ca II H+K, Na… Expand

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