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|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 Å. Significant diversity is seen in the near-maximum-light spectra (∼2000–3500 Å) 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 Δm15(B), but with much larger scatter relative to the correlation in the broadband B band (e.g., ∼0.4 mag versus ∼0.2 mag for those with 0.8 mag < Δm15(B) < 1.7 mag). SN 2004dt is found as an outlier of this correlation (at > 3σ), being brighter than normal SNe Ia such as SN 2005cf by ∼0.9 mag and ∼2.0 mag 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.|
|Electronic Publication Date:||30-Mar-2012|
|Citation:||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, Höflich, 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. (2012). Evidence for Type Ia Supernova Diversity from Ultraviolet Observations with the Hubble Space Telescope. apj, 749 (126 - 126. doi:10.1088/0004-637X/749/2/126|
|Type of Material:||Journal Article|
|Journal/Proceeding Title:||Astrophysical Journal|
|Version:||Final published version. This is an open access article.|
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