The subluminous supernova 2007qd

A missing link in a family of low-luminosity Type Ia supernovae

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

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

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 -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.

Original languageEnglish (US)
Pages (from-to)704-716
Number of pages13
JournalAstrophysical Journal
Volume720
Issue number1
DOIs
StatePublished - Sep 1 2010

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photometry
supernovae
brightness
spectroscopy
luminosity
deflagration
light curve
physical property
physical properties
time measurement
oxygen
carbon
family

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

McClelland, C. M., Garnavich, P. M., Galbany, L., Miquel, R., Foley, R. J., Filippenko, A. V., ... Schneider, D. P. (2010). The subluminous supernova 2007qd: A missing link in a family of low-luminosity Type Ia supernovae. Astrophysical Journal, 720(1), 704-716. https://doi.org/10.1088/0004-637X/720/1/704
McClelland, Colin M. ; Garnavich, Peter M. ; Galbany, Lluís ; 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. / The subluminous supernova 2007qd : A missing link in a family of low-luminosity Type Ia supernovae. In: Astrophysical Journal. 2010 ; Vol. 720, No. 1. pp. 704-716.
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McClelland, CM, Garnavich, PM, Galbany, L, Miquel, R, Foley, RJ, Filippenko, AV, Bassett, B, Wheeler, JC, Goobar, A, Jha, SW, Sako, M, Frieman, JA, Sollerman, J, Vinko, J & Schneider, DP 2010, 'The subluminous supernova 2007qd: A missing link in a family of low-luminosity Type Ia supernovae', Astrophysical Journal, vol. 720, no. 1, pp. 704-716. https://doi.org/10.1088/0004-637X/720/1/704

The subluminous supernova 2007qd : A missing link in a family of low-luminosity Type Ia supernovae. / McClelland, Colin M.; Garnavich, Peter M.; Galbany, Lluís; 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.

In: Astrophysical Journal, Vol. 720, No. 1, 01.09.2010, p. 704-716.

Research output: Contribution to journalArticle

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T1 - The subluminous supernova 2007qd

T2 - A missing link in a family of low-luminosity Type Ia supernovae

AU - McClelland, Colin M.

AU - Garnavich, Peter M.

AU - Galbany, Lluís

AU - Miquel, Ramon

AU - Foley, Ryan J.

AU - Filippenko, Alexei V.

AU - Bassett, Bruce

AU - Wheeler, J. Craig

AU - Goobar, Ariel

AU - Jha, Saurabh W.

AU - Sako, Masao

AU - Frieman, Joshua A.

AU - Sollerman, Jesper

AU - Vinko, Jozsef

AU - Schneider, Donald P.

PY - 2010/9/1

Y1 - 2010/9/1

N2 - 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 -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.

AB - 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 -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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McClelland CM, Garnavich PM, Galbany L, Miquel R, Foley RJ, Filippenko AV et al. The subluminous supernova 2007qd: A missing link in a family of low-luminosity Type Ia supernovae. Astrophysical Journal. 2010 Sep 1;720(1):704-716. https://doi.org/10.1088/0004-637X/720/1/704