UV–OPTICAL OBSERVATION OF TYPE Ia SUPERNOVA SN 2013dy IN NGC 7250
- Yunnan Observatories (YNAO), Chinese Academy of Sciences, Kunming 650011 (China)
- Physics Department and Tsinghua Center for Astrophysics (THCA), Tsinghua University, Beijing 100084 (China)
- National Astronomical Observatories of China (NAOC), Chinese Academy of Sciences, Beijing 100012 (China)
- Argelander-Institut für Astronomie, Auf dem Hügel 71, D-53121, Bonn (Germany)
Extensive and independent observations of Type Ia supernova (SN Ia) SN 2013dy are presented, including a larger set of UBVRI photometry and optical spectra from a few days before the peak brightness to ∼ 200 days after explosion, and ultraviolet (UV) photometry spanning from t ≈ –10 days to t ≈ +15 days refers to the B band maximum. The peak brightness (i.e., M {sub B} = –19.65 ± 0.40 mag; L {sub max} = [1.95 ± 0.55] × 10{sup 43} erg s{sup −1}) and the mass of synthesized {sup 56}Ni (i.e., M ({sup 56}Ni) = 0.90 ± 0.26 M {sub ⊙}) are calculated, and they conform to the expectation for an SN Ia with a slow decline rate (i.e., Δ m {sub 15}( B ) = 0.90 ± 0.03 mag). However, the near infrared (NIR) brightness of this SN (i.e., M {sub H} = –17.33 ± 0.30 mag) is at least 1.0 mag fainter than usual. Besides, spectroscopy classification reveals that SN 2013dy resides on the border of “core normal” and “shallow silicon” subclasses in the Branch et al. classification scheme, or on the border of the “normal velocity” SNe Ia and 91T/99aa-like events in the Wang et al. system. These suggest that SN 2013dy is a slow-declining SN Ia located on the transitional region of nominal spectroscopic subclasses and might not be a typical normal sample of SNe Ia.
- OSTI ID:
- 22663087
- Journal Information:
- Astronomical Journal (Online), Vol. 151, Issue 5; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
- Country of Publication:
- United States
- Language:
- English
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