J/MNRAS/372/1315 UBVRI photometry of SN 2004et (Sahu+, 2006) ================================================================================ Photometric and spectroscopic evolution of the Type IIP supernova SN 2004et. Sahu D.K., Anupama G.C., Srividya S., Muneer S. =2006MNRAS.372.1315S ================================================================================ ADC_Keywords: Supernovae ; Photometry, UBVRI Keywords: supernovae: general - supernovae: individual: SN 2004et - galaxies: individual: NGC 6946 Abstract: We present optical photometry and spectroscopy of the Type IIP supernova SN 2004et that occurred in the nearby galaxy NGC 6946. The observations span a time range of 8541 d after explosion. The late time bolometric luminosity and the H{alpha} luminosity in the nebular phase indicate that 0.06+/-0.02M_{sun}_ of ^56^Ni was synthesized during the explosion. The plateau luminosity, its duration and the expansion velocity of the supernova at the middle of the plateau indicate an explosion energy of E_exp_=1.20^+0.38^_-0.30_x10^51^erg. The late time light curve and the evolution of the [OI] and H{alpha} emission-line profiles indicate the possibility of an early dust formation in the supernova ejecta. The luminosity of [OI] 6300, 6364{AA} doublet, before the dust formation phase, is found to be comparable to that of SN 1987A at similar epochs, implying an oxygen mass in the range 1.52M_{sun}_, and a main-sequence mass of 20M_{sun}_ for the progenitor. Description: SN 2004et was observed with the 2-m Himalayan Chandra Telescope (HCT) of the Indian Astronomical Observatory (IAO), Hanle, India, using the Himalaya Faint Object Spectrograph Camera (HFOSC). The photometric monitoring of SN 2004et, in Bessell UBVRI filters, began on 2004 September 29, soon after its discovery, and continued until 2006 March 16. The spectroscopic observations of SN 2004et started on 2004 October 16 and continued until 2005 December 30. Objects: --------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------- 20 35 25.3 +60 07 18 SN 2004et = SN 2004et --------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2.dat 94 67 Photometric observations of SN 2004et -------------------------------------------------------------------------------- See also: II/256 : Sternberg Supernova Catalogue, 2004 version (Tsvetkov+, 2004) J/A+A/317/423 : Revised photometry of SNIa (Patat, 1997) J/A+A/428/555 : UBVRIJHKs photometry of 2000cx (Sollerman+, 2004) J/AJ/112/2408 : Light Curves of 29 SNe (Hamuy+ 1996) J/AJ/131/527 : UBVRI light curves of 44 type Ia supernovae (Jha+, 2006) Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 A10 "YYYY/MM/DD" Date Observation date 12- 22 F11.3 d JD Julian date 24- 29 F6.2 d Phase Phase, relative to the epoch of explosion (JD 2453270.5) 31- 36 F6.3 mag Umag ? U magnitude 38- 42 F5.3 mag e_Umag ? rms uncertainty on Umag 44- 49 F6.3 mag Bmag ? B magnitude 51- 55 F5.3 mag e_Bmag ? rms uncertainty on Bmag 57- 62 F6.3 mag Vmag ? V magnitude 64- 69 F6.4 mag e_Vmag ? rms uncertainty on Vmag 70- 75 F6.3 mag Rmag ? R magnitude 77- 81 F5.3 mag e_Rmag ? rms uncertainty on Rmag 83- 88 F6.3 mag Imag ? I magnitude 90- 94 F5.3 mag e_Imag ? rms uncertainty on Imag -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Patricia Vannier [CDS] 08-Jun-2007