Journal
ASTROPHYSICAL JOURNAL
Volume 720, Issue 1, Pages 704-716Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/720/1/704
Keywords
galaxies: individual (SDSS J020932.73-005959.8); supernovae: general; supernovae: individual (SN 2007qd, SN 2008ha, SN 2002cx, SN 2005hk)
Categories
Funding
- Alfred P. Sloan Foundation
- National Science Foundation (NSF) [AST-0908886, AST-0847157]
- U.S. Department of Energy (DOE)
- National Aeronautics and Space Administration (NASA)
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- American Museum of Natural History
- Astrophysical Institute Potsdam
- University of Basel
- University of Cambridge
- Case Western Reserve University
- University of Chicago
- Drexel University
- Fermilab
- Institute for Advanced Study
- Japan Participation Group
- Johns Hopkins University
- Joint Institute for Nuclear Astrophysics
- Kavli Institute for Particle Astrophysics and Cosmology
- Korean Scientist Group
- Chinese Academy of Sciences
- Los Alamos National Laboratory
- Max-Planck-Institute for Astronomy (MPIA)
- Max-Planck-Institute for Astrophysics (MPA)
- New Mexico State University
- Ohio State University
- University of Pittsburgh
- University of Portsmouth
- Princeton University
- United States Naval Observatory
- University of Washington
- W. M. Keck Foundation
- University of Notre Dame
- NASA/STScI [HST-GO-10893.01-A]
- DOE [DE-FG02-08ER41563, DE-FG02-08ER41562]
- ICREA Funding Source: Custom
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We present multi-band photometry and multi-epoch spectroscopy of the peculiar Type Ia supernova (SN la) 2007qd, discovered by the SDSS-II Supernova Survey. It possesses physical properties intermediate to those of the peculiar SN 2002cx and the extremely low-luminosity SN 2008ha. Optical photometry indicates that it had an extraordinarily fast rise time of less than or similar to 10 days and a peak absolute B magnitude of -15.4 +/- 0.2 at most, making it one of the most subluminous SN la ever observed. Follow-up spectroscopy of SN 2007qd near maximum brightness unambiguously shows the presence of intermediate-mass elements which are likely caused by carbon/oxygen nuclear burning. Near maximum brightness, SN 2007qd had a photospheric velocity of only 2800 km s(-1), similar to that of SN 2008ha but about 4000 and 7000 km s(-1) less than that of SN 2002cx and normal SN la, respectively. We show that the peak luminosities of SN 2002cx like objects are highly correlated with both their light-curve stretch and photospheric velocities. Its strong apparent connection to other SN 2002cx like events suggests that SN 2007qd is also a pure deflagration of a white dwarf, although other mechanisms cannot be ruled out. It may be a critical link between SN 2008ha and the other members of the SN 2002cx like class of objects.
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