First ToO UV spectroscopy of core-collapse SNe with GALEX - SN 2005ay

NUV-optical-IR color composite image of SN 2005ay in NGC 3938

(Blue - Galex NUV; Green - Palomar 60" B; Red - Palomar 60" I)

Executive Summary: SNe 2005ay is our first ToO target. Observations were conducted in cycle 1 (2005) and additional calibrations (reference frames) obtained in cycle 4 (2007). Data are fully reduced, and a first paper published here. The main result is that UV spectra of SNe II-P are remarkably similar, and that combining the data sets existing for three events so far (SN 1999em, HST/STIS; SN 2005cs, Swift/UVOT; our GALEX observations of SN 2005ay) you can trace the evolution of restframe UV spectra of SNe II-P throughout the first month after explosion, and use that information to calculate S-corrections, and interpret high redshifts survey data (where optical observations sample rest-UV SN light). Our findings bode well for SN II-P cosmology out to high redshift.

First GALEX data:

GALEX NUV observations from April 2, 2005. Left - direct image. Right - corresponding grism image. SN 2005ay is well detected in this single orbit grism image (out of a total of 12).

GALEX observations (all dates UT):

  • Photometry:

    April 2,15,16; NUV only

  • Grism Spectroscopy:

    April 2,3,8,15,16; NUV only

    Follow-up of SN 2005ay (all dates UT):

  • Optical Photometry:

    March 31; UBVRI; TNG+Dolores
    April 1; UBVRI; P60
    April 1; UBVRI; KAIT
    April 2; UBVRI; P60
    April 2; UBVri; CfA 1.2m
    April 2; VRI; Cassini 1.52m+BFOSC
    April 3; UBVri; CfA 1.2m
    April 4; BVR; Cassini 1.52m+BFOSC
    April 4; BVRI; TNT 0.72m
    April 5; UBVri; CfA 1.2m
    April 5; UBVRI; KAIT
    April 5; BVRI; TNT 0.72m
    April 5; BVRI; Asiago 1.82m+AFOSC
    April 6; BVRI; TNT 0.72m
    April 7; UBVri; CfA 1.2m
    April 9; UBVri; CfA 1.2m
    April 10; UBVri; CfA 1.2m
    April 10; UBVRI; Wise 1m
    April 10; BVRI; Lick 1m
    April 11; UBVRI; P60
    April 11; BVRI; Lick 1m
    April 12; UBVri; CfA 1.2m
    April 12; UBVRI; KAIT
    April 12; BVRI; Lick 1m
    April 13; UBVri; CfA 1.2m
    April 14; BVRI; TNT 0.72m
    April 14; UBVri; CfA 1.2m
    April 14: R; Wise 1m
    April 15; UBVRI; P60
    April 15; VR; Wise 1m
    April 15; UBVri; CfA 1.2m
    April 16; VR; Wise 1m
    April 16; UBVRI; P60
    April 18; UBVri; CfA 1.2m
    April 19; UBVri; CfA 1.2m
    April 21; UBVRI; P60
    April 22; UBVri; CfA 1.2m
    April 23; UBVRI; P60
    April 23; UBVri; CfA 1.2m
    April 25; UBVri; CfA 1.2m
    April 26; UBVri; CfA 1.2m
    April 26; BVRI; TNT 0.72m
    April 27; UBVri; CfA 1.2m
    April 27; BVRI; TNT 0.72m
    April 28; BVRI; Wise 1m
    April 28; BVRI; TNT 0.72m
    May 2; UBVri; CfA 1.2m
    May 2; BVRI; TNT 0.72m
    May 2; BVRi; Asiago 1.82m+AFOSC
    May 4; UBVri; CfA 1.2m
    May 5; UBVri; CfA 1.2m
    May 5; UR; P60
    May 7; UBVri; CfA 1.2m
    May 8; UBVri; CfA 1.2m
    May 9; UBVri; CfA 1.2m
    May 11; UBVRI; P60
    May 12; BVRi; Asiago 1.82m+AFOSC
    May 15; UBVRI; P60
    May 18; UBVRI; P60
    May 19; UBVri; CfA 1.2m
    May 23; UBVRI; P60
    May 24; BVRI; TNT 0.72m
    May 21; UBVri; CfA 1.2m
    May 26; BVRI; TNT 0.72m
    May 26; UBVri; CfA 1.2m
    May 27; UBVri; CfA 1.2m
    May 28; UBVRI; P60
    May 30; UBVRI; P60
    May 30; BVR; TNT 0.72m
    May 31; UBVRI; P60
    June 2; UBVri; CfA 1.2m
    June 4; UBVRI; P60
    June 5; UBVRI; TNG+Dolores
    June 6; UBVRI; TNG+Dolores
    June 6; UBVRI; P60
    June 7; UBVri; CfA 1.2m
    June 9; UBVRI; P60
    June 10; UBVRI; P60
    June 11; UBVRI; P60
    June 13; UBVRI; P60
    June 14; UBVRI; P60
    June 15; UBVRI; P60
    June 17; UBVRI; P60
    June 18; UBVri; CfA 1.2m
    June 20; UBVri; CfA 1.2m
    June 20; UBVRI; P60
    June 21; UBVRI; P60
    June 22; UBVri; CfA 1.2m
    June 23; UBVRI; P60
    June 24; UBVRI; P60
    June 27; UBVRI; P60
    June 28; UBVri; CfA 1.2m
    June 29; UBVRI; P60
    June 30; UBVRI; P60
    July 9; UBVRI; P60
    July 11; UBVRI; P60
    July 18; R; P60
    July 19; UBVRI; P60

  • Optical Spectroscopy:

    March 28; P200+DBSP
    March 30; CA2.2m+CAFOS
    March 30; CfA1.5m
    March 31; P200+DBSP
    March 31; TNG+Dolores
    April 2; Cassini 1.52m+BFOSC
    April 4; P200+DBSP
    April 4; Cassini 1.52m+BFOSC
    April 5; Asiago 1.82m+AFOSC
    April 11; Lick3m+KAST
    April 15; CfA1.5m
    April 16; P200+DBSP
    April 16; Lick+KAST (high-res)
    April 30; P200+DBSP
    May 2; Asiago 1.82m+AFOSC
    May 6; CfA1.5m
    May 12; Asiago 1.82m+AFOSC
    June 4; P200+DBSP
    June 5; TNG+Dolores
    June 8+9; TNG+Dolores
    June 16; CfA1.5m
    July 16; P200+DBSP

  • IR Photometry:

    March 30; JHK; AZT24+SWIRCAM
    April 1; JHK; AZT24+SWIRCAM
    April 2; JHK; AZT24+SWIRCAM
    April 3; JHK; AZT24+SWIRCAM
    April 4; JHK; AZT24+SWIRCAM
    April 5; JHK; AZT24+SWIRCAM
    April 6; JHK; AZT24+SWIRCAM
    April 7; JHK; AZT24+SWIRCAM
    April 13; JHK; AZT24+SWIRCAM
    April 14; JHK; AZT24+SWIRCAM
    April 15; JHK; P200+WIRC
    April 17; J; AZT24+SWIRCAM (Bad weather)
    April 30; JHK; P200+WIRC
    June 5; JHK; P200+WIRC
    July 17; JHK; P200+WIRC

    Additional data:

  • See observations published by Tsvetkov et al. (2006) here.

    TNG Dolores spectrum of SN 2005ay obtained on Mar. 31. Balmer lines are evident, and the blue continuum is indicative of a young type II SN (Courtesy M. Bufano and E. Cappellaro).

    Lick 3m KAST spectrum of SN 2005ay obtained on Apr. 11. This looks like a pretty typical, well-evolved type II-P SN.
    Note the continuum drop below 4000 Angstrom. (Courtesy A. Filippenko and R. Foley).

    Constructed: April 2005, by: Avishay Gal-Yam , E-Mail: