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SUMMARY:A Natural ≳ Telescope: Discovery of the Strongly Lensed Type II 
 SN 2025mkn at z=1.37
DTSTART:20260427T103000Z
DTEND:20260427T113000Z
DTSTAMP:20260530T234900Z
UID:indico-event-17@events.gw.iucaa.in
DESCRIPTION:Speakers: Anindya Ganguly (IUCAA\, Pune\, India)\n\nWe present
  the discovery of SN 2025mkn\, a gravitationally lensed Type II supernova.
  First detected as a blue transient in ZTF\, 0.83 from a  elliptical gala
 xy\, follow-up SNIFS/UH2.2m and LRIS/Keck spectra revealed absorption line
 s at . Later JWST NIRCam imaging shows that the bright transient is a clos
 e pair of point sources separated by \, and a 30 times fainter counterimag
 e opposite the lens\, for which NIRSpec reveals strong H emission also at 
 . The light curves and spectra are consistent with the Type II supernova s
 ource being magnified ≳ times\, with  required to reconcile its luminos
 ity with that of nearby events such as SN 2023ixf. Lens models are consist
 ent with such high magnifications\, and always show that the faint image a
 rrived first (undetected in earlier ZTF imaging)\, consistent with the lat
 er spectral phase of this fainter image. A fourth image is also predicted 
 and possibly detected in the NIRSpec data. Light-curve-based time-delay me
 asurements are not possible due to the first image being the faintest\; ho
 wever\, the resolved NIRSpec spectra offer a future opportunity for time-d
 elay cosmography through supernova phase measurements.\n \nLink to the pa
 per:   https://arxiv.org/abs/2604.07983 \n\nhttps://events.gw.iucaa.in/
 event/17/
LOCATION:Lecture Hall/Bhaskara-1 (IUCAA\, Pune\, India)
URL:https://events.gw.iucaa.in/event/17/
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