Year: 2015
Type: article
Abstract: We present ultraviolet (UV) and optical photometry and spectra of the 1999aa-like supernova (SN) iPTF14bdn. The UV data were observed using the Swift Ultraviolet/Optical Telescope and constitute the first UV spectral series of a 1999aa-like SN. From the photometry, we measure Δ m 15 ( B ) = 0.84 ± 0.05 mag and blue UV colors at epochs earlier than −5 days. The spectra show that the early-time blue colors are the result of less absorption between 2800−3200 Å than is present in normal SNe Ia. Using model spectra fits of the data at −10 and +10 days, we identify the origin of this spectral feature to be a temperature effect in which doubly ionized iron group elements create an opacity "window." We determine that the detection of high temperatures and large quantities of iron group elements at early epochs imply the mixing of a high Ni mass into the outer layers of the SN ejecta. We also identify the source of the I -band secondary maximum in iPTF14bdn to be the decay of Fe iii to Fe ii , as is seen in normal SNe Ia.
Source: The Astrophysical Journal
Authors: Michael T. Smitka, Peter J. Brown, Nicholas B. Suntzeff, Jujia Zhang, Qian Zhai, Xiaofeng Wang, Jun Mo, Tianmeng Zhang
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Aeronautics and Space Administration, California Institute of Technology, National Natural Science Foundation of China, Chinese Academy of Sciences, Tsinghua University, People's Government of Yunnan Province, Jet Propulsion Laboratory, National Astronomical Observatories, Chinese Academy of Sciences
Awards: G4952568767, TYPE IA SUPERNOVAE (SNE IA) ARE ONE OF THE PRIMARY TOOLS TO STUDY THE EXPANSION HISTORY OF THE UNIVERSE. THEIR USEFULNESS AS PRECISION STANDARD CANDL, G5644026411, G5677590596, G5933993633, WE PROPOSE TO REOBSERVE THE LOCATIONS OF 17 TYPE IA SUPERNOVAE SNE IA AFTER THE SUPERNOVAE LIGHT HAS FADED TO GATHER UVOT UVGRISM TEMPLATE IMAGES. TH, G800705978, G964417733, G988696487
OpenAlex ID: W2267597420