EVIDENCE FOR TYPE Ia SUPERNOVA DIVERSITY FROM ULTRAVIOLET OBSERVATIONS WITH THE HUBBLE SPACE TELESCOPE Academic Article uri icon

abstract

  • We present ultraviolet (UV) spectroscopy and photometry of four Type Ia supernovae (SNe 2004dt, 2004ef, 2005M, and 2005cf) obtained with the UV prism of the Advanced Camera for Surveys on the Hubble Space Telescope. This data set provides unique spectral time series down to 2000 . Significant diversity is seen in the near-maximum-light spectra (2000-3500 ) for this small sample. The corresponding photometric data, together with archival data from Swift Ultraviolet/Optical Telescope observations, provide further evidence of increased dispersion in the UV emission with respect to the optical. The peak luminosities measured in the uvw1/F250W filter are found to correlate with the B-band light-curve shape parameter m 15(B), but with much larger scatter relative to the correlation in the broadband B band (e.g., 0.4mag versus 0.2mag for those with 0.8 mag < m 15(B) < 1.7mag). SN2004dt is found as an outlier of this correlation (at > 3), being brighter than normal SNe Ia such as SN2005cf by 0.9mag and 2.0mag in the uvw1/F250W and uvm2/F220W filters, respectively. We show that different progenitor metallicity or line-expansion velocities alone cannot explain such a large discrepancy. Viewing-angle effects, such as due to an asymmetric explosion, may have a significant influence on the flux emitted in the UV region. Detailed modeling is needed to disentangle and quantify the above effects. 2012. The American Astronomical Society. All rights reserved.

published proceedings

  • ASTROPHYSICAL JOURNAL

altmetric score

  • 6.25

author list (cited authors)

  • Wang, X., Wang, L., Filippenko, A. V., Baron, E., Kromer, M., Jack, D., ... Yamaoka, H.

citation count

  • 49

complete list of authors

  • Wang, Xiaofeng||Wang, Lifan||Filippenko, Alexei V||Baron, Eddie||Kromer, Markus||Jack, Dennis||Zhang, Tianmeng||Aldering, Greg||Antilogus, Pierre||Arnett, W David||Baade, Dietrich||Barris, Brian J||Benetti, Stefano||Bouchet, Patrice||Burrows, Adam S||Canal, Ramon||Cappellaro, Enrico||Carlberg, Raymond G||di Carlo, Elisa||Challis, Peter J||Crotts, Arlin PS||Danziger, John I||Della Valle, Massimo||Fink, Michael||Foley, Ryan J||Fransson, Claes||Gal-Yam, Avishay||Garnavich, Peter M||Gerardy, Chris L||Goldhaber, Gerson||Hamuy, Mario||Hillebrandt, Wolfgang||Hoeflich, Peter||Holland, Stephen T||Holz, Daniel E||Hughes, John P||Jeffery, David J||Jha, Saurabh W||Kasen, Dan||Khokhlov, Alexei M||Kirshner, Robert P||Knop, Robert A||Kozma, Cecilia||Krisciunas, Kevin||Lee, Brian C||Leibundgut, Bruno||Lentz, Eric J||Leonard, Douglas C||Lewin, Walter HG||Li, Weidong||Livio, Mario||Lundqvist, Peter||Maoz, Dan||Matheson, Thomas||Mazzali, Paolo A||Meikle, Peter||Miknaitis, Gajus||Milne, Peter A||Mochnacki, Stefan W||Nomoto, Ken'ichi||Nugent, Peter E||Oran, Elaine S||Panagia, Nino||Perlmutter, Saul||Phillips, Mark M||Pinto, Philip||Poznanski, Dovi||Pritchet, Christopher J||Reinecke, Martin||Riess, Adam G||Ruiz-Lapuente, Pilar||Scalzo, Richard A||Schlegel, Eric M||Schmidt, Brian P||Siegrist, James||Soderberg, Alicia M||Sollerman, Jesper||Sonneborn, George||Spadafora, Anthony||Spyromilio, Jason||Sramek, Richard A||Starrfield, Sumner G||Strolger, Louis G||Suntzeff, Nicholas B||Thomas, Rollin C||Tonry, John L||Tornambe, Amedeo||Truran, James W||Turatto, Massimo||Turner, Michael||Van Dyk, Schuyler D||Weiler, Kurt W||Wheeler, J Craig||Wood-Vasey, Michael||Woosley, Stanford E||Yamaoka, Hitoshi

publication date

  • April 2012