Issue |
A&A
Volume 611, March 2018
|
|
---|---|---|
Article Number | A58 | |
Number of page(s) | 33 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361/201730886 | |
Published online | 27 March 2018 |
Two transitional type Ia supernovae located in the Fornax cluster member NGC 1404: SN 2007on and SN 2011iv★
1
Department of Physics and Astronomy, Aarhus University,
Ny Munkegade 120,
8000 Aarhus C,
Denmark
e-mail: christa@dark-cosmology.dk
2
Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen,
Juliane Maries Vej 30,
2100 Copenhagen Ø,
Denmark
3
Astrophysics Research Institute, Liverpool John Moores University,
IC2,
Liverpool Science Park,
146 Brownlow Hill, Liverpool L3 5RF,
UK
4
Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma,
440 W. Brooks,
Rm 100,
Norman,
OK 73019-2061,
USA
5
Observatories of the Carnegie Institution for Science,
813 Santa Barbara St.,
Pasadena,
CA 91101,
USA
6
Department of Physics, Florida State University,
Tallahassee,
FL 32306,
USA
7
Carnegie Observatories,
Las Campanas Observatory,
601 Casilla, La Serena,
Chile
8
Department of Astronomy, University of California,
Berkeley,
CA 94720-3411,
USA
9
Miller Senior Fellow, Miller Institute for Basic Research in Science, University of California,
Berkeley,
CA 94720,
USA
10
European Southern Observatory,
Alonso de Córdova 3107,
Casilla 19, Santiago,
Chile
11
INAF-Osservatorio Astronomico di Padova,
vicolo dell Osservatorio 5,
35122 Padova,
Italy
12
George P. and Cynthia Woods Mitchell Institute for Fundamental Physics & Astronomy, Texas A&M University, Department of Physics,
4242 TAMU, College Station,
TX 77843,
USA
13
Department of Astronomy and Astrophysics, University of California,
Santa Cruz,
CA 95064,
USA
14
School of Physics, O’Brien Centre for Science North, University College Dublin,
Belfield, Dublin 4,
Ireland
15
Department of Astronomy, University of Texas,
Austin,
TX 78712,
USA
16
Departamento de Ciencias Fisicas, Universidad Andres Bello,
Avda. Republica 252,
Santiago,
Chile
17
Millennium Institute of Astrophysics,
782-0436 Macul,
Santiago,
Chile
18
The Oskar Klein Centre, Department of Astronomy, Stockholm University,
AlbaNova,
10691 Stockholm,
Sweden
19
Department of Physics, University of California,
Davis,
CA 95616,
USA
Received:
29
March
2017
Accepted:
19
September
2017
We present an analysis of ultraviolet (UV) to near-infrared observations of the fast-declining Type Ia supernovae (SNe Ia) 2007on and 2011iv, hosted by the Fornax cluster member NGC 1404. The B-band light curves of SN 2007on and SN 2011iv are characterised by Δm15 (B) decline-rate values of 1.96 mag and 1.77 mag, respectively. Although they have similar decline rates, their peak B- and H-band magnitudes differ by ~ 0.60 mag and ~0.35 mag, respectively. After correcting for the luminosity vs. decline rate and the luminosity vs. colour relations, the peak B-band and H-band light curves provide distances that differ by ~ 14% and ~ 9%, respectively. These findings serve as a cautionary tale for the use of transitional SNe Ia located in early-type hosts in the quest to measure cosmological parameters. Interestingly, even though SN 2011iv is brighter and bluer at early times, by three weeks past maximum and extending over several months, its B − V colour is 0.12 mag redder than that of SN 2007on. To reconcile this unusual behaviour, we turn to guidance from a suite of spherical one-dimensional Chandrasekhar-mass delayed-detonation explosion models. In this context, 56Ni production depends on both the so-called transition density and the central density of the progenitor white dwarf. To first order, the transition density drives the luminosity–width relation, while the central density is an important second-order parameter. Within this context, the differences in the B − V colour evolution along the Lira regime suggest that the progenitor of SN 2011iv had a higher central density than SN 2007on.
Key words: supernovae: general / supernovae: individual: SN 2007on / supernovae: individual: SN 2011iv / dust, extinction
The photometry tables are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/611/A58
© ESO 2018
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