NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-18 T02:29:55 PDT
Help | Comment | NED Home

For refcode 2007ApJ...659.1488B:
Retrieve 10 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2007ApJ...659.1488B Early Ultraviolet, Optical, and X-Ray Observations of the Type IIP SN 2005cs in M51 with Swift Peter J. Brown, Luc Dessart, Stephen T. Holland, Stefan Immler, Wayne Landsman, Stephane Blondin, Alexander J. Blustin, Alice Breeveld, Gulab C. Dewangan, Neil Gehrels, Robert B. Hutchins, Robert P. Kirshner, Keith O. Mason, Paolo A. Mazzali, Peter Milne, Maryam Modjaz, and Peter W. A. Roming Abstract. We report early photospheric-phase observations of the Type IIP supernova (SN) 2005cs obtained by the Swift ultraviolet-optical and X-ray telescopes. Observations started within 2 days of discovery and continued on a regular basis for 3 weeks. During this time the V-band magnitude remained essentially constant, while the UV was initially bright, but steadily faded until below the brightness of an underlying UV-bright H II region. This UV decay is similar to SNe II observed by the International Ultraviolet Explorer. UV grism spectra show the P Cygni absorption of Mg II 2798 Angstrom, indicating a photospheric origin of the UV flux. Based on non-LTE model atmosphere calculations with the CMFGEN code, we associate the rapid evolution of the UV flux with the cooling of the ejecta, the peak of the spectral energy distribution (SED) shifting from ~700 Angstrom on June 30 to ~1200 Angstrom on July 5. Furthermore, the corresponding recombination of the ejecta, e.g., the transition from Fe III to Fe II, induces a considerable strengthening of metal line -- blanketing at and above the photosphere, blocking more and more effectively this fading UV flux. SN 2005cs was not detected in the X-ray band, and the upper limit to the X-ray luminosity yields a limit to the mass-loss rate of the progenitor of M^dot^<~1x10^-5^ yr^-1^ (v_w_/10 km s^-1^). Overall, Swift represents a unique opportunity to capture the early and fast evolution of Type II SNe in the UV, providing additional constraints on the reddening, the SED shortward of 4000 Angstrom, and the ionization state and temperature of the photon-decoupling regions.
Retrieve 10 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home