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  • Jencson, Jacob E. (author)

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

  • Article/chapterEnglish2019

Publisher, publication year, extent ...

  • 2019-07-26
  • American Astronomical Society,2019
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-171672
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-171672URI
  • https://doi.org/10.3847/2041-8213/ab2c05DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • We present the discovery of an optical transient (OT) in Messier. 51, designated M51 OT2019-1 (also ZTF 19aadyppr, AT 2019abn, ATLAS19bz1), by the Zwicky Transient Facility (ZTF). The OT rose over 15. days to an observed luminosity of M-r = -13 (nu L-nu = 9 x 10(6) L-circle dot), in the luminosity gap between novae and typical supernovae (SNe). Spectra during the outburst show a red continuum, Balmer emission with a velocity width of approximate to 400 km s(-1), Ca II and [Ca II] emission, and absorption features characteristic of an F-type supergiant. The spectra and multiband light curves are similar to the so-called SN impostors and intermediate-luminosity red transients (ILRTs). We directly identify the likely progenitor in archival Spitzer Space Telescope imaging with a 4.5 mu m luminosity of M-[4.5] approximate to -12.2 mag and a [3.6]-[4.5] color redder than 0.74 mag, similar to those of the prototype ILRTs SN 2008S and NGC 300 OT2008-1. Intensive monitoring of M51 with Spitzer further reveals evidence for variability of the progenitor candidate at [ 4.5] in the years before the OT. The progenitor is not detected in pre-outburst Hubble Space Telescope optical and near-IR images. The optical colors during outburst combined with spectroscopic temperature constraints imply a higher reddening of E(B - V) approximate to 0.7 mag and higher intrinsic luminosity of M-r approximate to -14.9 mag (nu L-nu = 5.3 x 10(7) L-circle dot) near peak than seen in previous ILRT candidates. Moreover, the extinction estimate is higher on the rise than on the plateau, suggestive of an extended phase of circumstellar dust destruction. These results, enabled by the early discovery of M51. OT2019-1 and extensive pre-outburst archival coverage, offer new clues about the debated origins of ILRTs and may challenge the hypothesis that they arise from the electron-capture induced collapse of extreme asymptotic giant branch stars.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Adams, Scott M. (author)
  • Bond, Howard E. (author)
  • van Dyk, Schuyler D. (author)
  • Kasliwal, Mansi M. (author)
  • Bally, John (author)
  • Blagorodnova, Nadejda (author)
  • De, Kishalay (author)
  • Fremling, Christoffer (author)
  • Yao, Yuhan (author)
  • Fruchter, Andrew (author)
  • Rubin, David (author)
  • Barbarino, CristinaStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)cbarb (author)
  • Sollerman, JesperStockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)solle (author)
  • Miller, Adam A. (author)
  • Hicks, Erin K. S. (author)
  • Malkan, Matthew A. (author)
  • Andreoni, Igor (author)
  • Bellm, Eric C. (author)
  • Buchheim, Robert (author)
  • Dekany, Richard (author)
  • Feeney, Michael (author)
  • Frederick, Sara (author)
  • Gal-Yam, Avishay (author)
  • Gehrz, Robert D. (author)
  • Giomi, Matteo (author)
  • Graham, Matthew J. (author)
  • Green, Wayne (author)
  • Hale, David (author)
  • Hankins, Matthew J. (author)
  • Hanson, Mark (author)
  • Helou, George (author)
  • Ho, Anna Y. Q. (author)
  • Hung, T. (author)
  • Juric, Mario (author)
  • Kendurkar, Malhar R. (author)
  • Kulkarni, S. R. (author)
  • Lau, Ryan M. (author)
  • Masci, Frank J. (author)
  • Neill, James D. (author)
  • Quin, Kevin (author)
  • Riddle, Reed L. (author)
  • Rusholme, Ben (author)
  • Sims, Forrest (author)
  • Smith, Nathan (author)
  • Smith, Roger M. (author)
  • Soumagnac, Maayane T. (author)
  • Tachibana, Yutaro (author)
  • Tinyanont, Samaporn (author)
  • Walters, Richard (author)
  • Watson, Stanley (author)
  • Williams, Robert E. (author)
  • Stockholms universitetInstitutionen för astronomi (creator_code:org_t)

Related titles

  • In:Astrophysical Journal Letters: American Astronomical Society880:22041-82052041-8213

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