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

McClelland, Colin M.; Garnavich, Peter M.; Galbany, Lluis; Miquel, Ramon; Foley, Ryan J.; Filippenko, Alexei V.; Bassett, Bruce; Wheeler, J.Craig; Goobar, Ariel; Jha, Saurabh W.; Sako, Masao; Frieman, Joshua A.; Sollerman, Jesper; Vinko, Jozsef; Schneider, Donald P.

doi:10.1088/0004-637X/720/1/704

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

Journal Article · Thu Jul 01 04:00:00 EDT 2010 · Astrophys.J.

DOI:https://doi.org/10.1088/0004-637X/720/1/704· OSTI ID:1967494

McClelland, Colin M. ^[1]; ^[1]; ^[2]; ^[3]; Foley, Ryan J. ^[4]; ^[5]; ^[6]; ^[7]; ^[8]; ^[9]; ^[10]; ^[11]; ^[12]; Vinko, Jozsef ^[13]; Schneider, Donald P. ^[14]

Notre Dame U.
Barcelona, IFAE
Barcelona, IFAE; ICREA, Barcelona
Harvard-Smithsonian Ctr. Astrophys.
UC, Berkeley
Cape Town U., Dept. Math.
Texas U.
Stockholm U.; Stockholm U., OKC
Rutgers U., Piscataway
Pennsylvania U.
Chicago U.; Fermilab
Bohr Inst.; Stockholm U., OKC
Szeged U.
Penn State U.

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 <= 10 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, similar to that of SN 2008ha but about 4000 and 7000 km/s 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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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1967494

Report Number(s):: FERMILAB-PUB-10-603-A; arXiv:1007.2850; oai:inspirehep.net:861905

Journal Information:: Astrophys.J., Journal Name: Astrophys.J. Vol. 720

Country of Publication:: United States

Language:: English

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