Статья

SLOW-SPEED SUPERNOVAE FROM THE PALOMAR TRANSIENT FACTORY: TWO CHANNELS

Christopher J. WhiteDepartment of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USAMansi M. KasliwalThe Observatories, Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USAPeter E. NugentComputational Cosmology Center, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAAvishay Gal-YamBenoziyo Center for Astrophysics, The Weizmann Institute of Science, Rehovot 76100, IsraelD. Andrew HowellDepartment of Physics, University of California, Santa Barbara, Broida Hall, Mail Code 9530, Santa Barbara, CA 93106-9530, USAMark SullivanSchool of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, UKAriel GoobarThe Oskar Klein Centre, Department of Physics, AlbaNova, Stockholm University, SE-106 91 Stockholm, SwedenAnthony L. PiroThe Observatories, Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USAJoshua S. BloomDepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USAShrinivas R. KulkarniCahill Center for Astrophysics, California Institute of Technology, Pasadena, CA 91125, USARuss R. LaherSpitzer Science Center, California Institute of Technology, M/S 314-6, Pasadena, CA 91125, USAFrank MasciSpitzer Science Center, California Institute of Technology, M/S 314-6, Pasadena, CA 91125, USAEran O. OfekBenoziyo Center for Astrophysics, The Weizmann Institute of Science, Rehovot 76100, IsraelJason SuraceSpitzer Science Center, California Institute of Technology, M/S 314-6, Pasadena, CA 91125, USASagi Ben-AmiBenoziyo Center for Astrophysics, The Weizmann Institute of Science, Rehovot 76100, IsraelYi CaoCahill Center for Astrophysics, California Institute of Technology, Pasadena, CA 91125, USAS. Bradley CenkoAstrophysics Science Division, NASA Goddard Space Flight Center, Mail Code 661, Greenbelt, MD 20771, USAIsobel M. HookDepartment of Physics (Astrophysics), University of Oxford, Keble Road, Oxford OX1 3RH, UKJakob JönssonThomas MathesonNational Optical Astronomy Observatory, Tucson, AZ 85719-4933, USAAssaf SternbergExcellence Cluster Universe, Technische Universitt Mnchen, Boltzmannstr. 2, D-85748 Garching, GermanyRobert M. QuimbyDepartment of Astronomy, San Diego State University, San Diego, CA 92182, USAOfer YaronBenoziyo Center for Astrophysics, The Weizmann Institute of Science, Rehovot 76100, Israel

2015en

ABI

Аннотация

Since the discovery of the unusual prototype SN 2002cx, the eponymous class of Type I (hydrogen-poor) supernovae with low ejecta speeds has grown to include approximately two dozen members identified from several heterogeneous surveys, in some cases ambiguously. Here we present the results of a systematic study of 1077 Type I supernovae discovered by the Palomar Transient Factory, leading to nine new members of this peculiar class. Moreover, we find there are two distinct subclasses based on their spectroscopic, photometric, and host galaxy properties: "SN 2002cx-like" supernovae tend to be in later-type or more irregular hosts, have more varied and generally dimmer luminosities, have longer rise times, and lack a Ti ii trough when compared to "SN 2002es-like" supernovae. None of our objects show helium, and we counter a previous claim of two such events. We also find that the occurrence rate of these transients relative to Type Ia supernovae is 5.6 +22 -3.8 % (90% confidence), lower compared to earlier estimates. Combining our objects with the literature sample, we propose that these subclasses have two distinct physical origins.

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Идентификаторы

DOI: 10.1088/0004-637x/799/1/52

Цитирования и источники

Цитирований: 2Использованных источников: 0

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