A&A 611, A58 (2018) Astronomy DOI: 10.1051/0004-6361/201730886 & c ESO 2018 Astrophysics Two transitional type Ia supernovae located in the Fornax cluster member NGC 1404: SN 2007on and SN 2011iv? C. Gall1; 2, M. D. Stritzinger1, C. Ashall3, E. Baron4, C. R. Burns5, P. Hoeflich6, E. Y. Hsiao6; 1, P. A. Mazzali3, M. M. Phillips7, A. V. Filippenko8; 9, J. P. Anderson10, S. Benetti11, P. J. Brown12, A. Campillay7, P. Challis10, C. Contreras7; 1, N. Elias de la Rosa11, G. Folatelli12, R. J. Foley13, M. Fraser14, S. Holmbo1, G. H. Marion15, N. Morrell7, Y.-C. Pan13, G. Pignata16; 17, N. B. Suntzeff12, F. Taddia18, S. Torres Robledo7, and S. Valenti19 1 Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C, Denmark e-mail:
[email protected] 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.