SN 2015bn: A nearby superluminous supernova

• by c_cld

  #SNe observations of SN 2015bn (= PS15ae = CSS141223-113342+004332 = MLS150211-113342+004333), a Type I superluminous supernova (SLSN) at redshiftz= 0.1136.

  arXiv:1603.04748 From: Matt Nicholl et al.

  Ra, Dec 11 33 41.55 00 43 33.4 , 173.423125 0.725944

  SN bright blue in DR2 cutout

  1237648722301616692 SDSS J113341.53+004333.3

  host galaxy just visible as a faint smudge.

  Posted May 4, 2016 9:50 AM

• by Budgieye moderator

  Very nice, and I see that the green image (green+ blue= cyan, or turquoise )is smaller than the blue image, as the supernova was brightening or fading.

  http://legacysurvey.org/viewer/jpeg-cutout/?ra=173.4243&dec=0.7255&zoom=16&layer=decals-dr2

  Posted May 4, 2016 11:37 AM

• by c_cld in response to Budgieye's comment.

  Fading phase after maximum 2015Mar21

  SN 2015bn reached r-band maximum light on MJD 57102 At r= 16.7 mag

  DECaLS

  Exposure 433194, g band, 69.0 sec exposure time, seeing 1.41 arcsec, 2015-04-07T02:12:41

  Exposure 433195, r band, 66.0 sec exposure time, seeing 1.18 arcsec, 2015-04-07T02:14:17

  Posted May 4, 2016 2:21 PM

• by Budgieye moderator

  Hmmm... Green and Blue filters only 2 minutes apart. That wouldn't explain any dimming. It must be brighter in blue, and makes a bigger "star".
  Discovered Dec 2014, just as it was brightening

  Posted May 4, 2016 4:13 PM

• by Ghost_Sheep_SWR

  I've seen the other confirmed SN images, but never one that outshines the whole host galaxy by a great margin(?) Or is it to do with DeCALS (DR2) 'sensitivity' / superluminous part?

  Thanks

  Posted May 4, 2016 11:51 PM