The Subluminous Supernova 2007qd: A Missing Link in a Family of Low-luminosity Type Ia Supernovae

Details The Subluminous Supernova 2007qd: A Missing Link in a Family of Low-luminosity Type Ia Supernovae The Subluminous Supernova 2007qd: A Missing Link in a Family of Low-luminosity Type Ia Supernovae

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...720..704m&link_type=abstract

The Astrophysical Journal, Volume 720, Issue 1, pp. 704-716 (2010).

Astronomy and Astrophysics

Astronomy

10

Galaxies: Individual: Sdss J020932.73-005959.8, Supernovae: General, Supernovae: Individual: Sn 2007Qd Sn 2008Ha Sn 2002Cx Sn 2005Hk

Scientific paper

We present multi-band photometry and multi-epoch spectroscopy of the peculiar Type Ia supernova (SN Ia) 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 lsim10 days and a peak absolute B magnitude of -15.4 ± 0.2 at most, making it one of the most subluminous SN Ia 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 Ia, 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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