Keck observations of the young metal-poor host galaxy of the super-chandrasekhar-mass type Ia supernova SN 2007if

M. Childress; G. Aldering; C. Aragon; P. Antilogus; S. Bailey; C. Baltay; S. Bongard; C. Buton; A. Canto; N. Chotard; Y. Copin; H. K. Fakhouri; E. Gangler; M. Kerschhaggl; M. Kowalski; E. Y. Hsiao; S. Loken; P. Nugent; K. Paech; R. Pain; E. Pecontal; R. Pereira; S. Perlmutter; D. Rabinowitz; K. Runge; R. Scalzo; R. C. Thomas; G. Smadja; C. Tao; B. A. Weaver; C. Wu

doi:10.1088/0004-637X/733/1/3

Keck observations of the young metal-poor host galaxy of the super-chandrasekhar-mass type Ia supernova SN 2007if

M. Childress^*, G. Aldering, C. Aragon, P. Antilogus, S. Bailey, C. Baltay, S. Bongard, C. Buton, A. Canto, N. Chotard, Y. Copin, H. K. Fakhouri, E. Gangler, M. Kerschhaggl, M. Kowalski, E. Y. Hsiao, S. Loken, P. Nugent, K. Paech, R. PainE. Pecontal, R. Pereira, S. Perlmutter, D. Rabinowitz, K. Runge, R. Scalzo, R. C. Thomas, G. Smadja, C. Tao, B. A. Weaver, C. Wu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

We present Keck LRIS spectroscopy and g-band photometry of the metal-poor, low-luminosity host galaxy of the super-Chandrasekhar-mass Type Ia supernova SN 2007if. Deep imaging of the host reveals its apparent magnitude to be m _g = 23.15±0.06, which at the spectroscopically measured redshift of z _helio = 0.07450±0.00015 corresponds to an absolute magnitude of M_g = -14.45±u0.06. Galaxy g - r color constrains the mass-to-light ratio, giving a host stellar mass estimate of log(M _*/M_⊙) = 7.32±0.17. Balmer absorption in the stellar continuum, along with the strength of the 4000 Å break, constrains the age of the dominant starburst in the galaxy to be t _burst = 123⁺¹⁶⁵ _-77 Myr, corresponding to a main-sequence turnoff mass of M/M_⊙ = 4.6^+2.6 _-1.4. Using the R ₂₃ method of calculating metallicity from the fluxes of strong emission lines, we determine the host oxygen abundance to be 12 + log(O/H)_KK04 = 8.01±0.09, significantly lower than any previously reported spectroscopically measured Type Ia supernova host galaxy metallicity. Our data show that SN 2007if is very likely to have originated from a young, metal-poor progenitor.

Original language	English
Article number	3
Journal	Astrophysical Journal
Volume	733
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/733/1/3
Publication status	Published - 20 May 2011

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Childress, M., Aldering, G., Aragon, C., Antilogus, P., Bailey, S., Baltay, C., Bongard, S., Buton, C., Canto, A., Chotard, N., Copin, Y., Fakhouri, H. K., Gangler, E., Kerschhaggl, M., Kowalski, M., Hsiao, E. Y., Loken, S., Nugent, P., Paech, K., ... Wu, C. (2011). Keck observations of the young metal-poor host galaxy of the super-chandrasekhar-mass type Ia supernova SN 2007if. Astrophysical Journal, 733(1), Article 3. https://doi.org/10.1088/0004-637X/733/1/3

@article{61d5943cae7d440db64d012d21ad8fd3,

title = "Keck observations of the young metal-poor host galaxy of the super-chandrasekhar-mass type Ia supernova SN 2007if",

abstract = "We present Keck LRIS spectroscopy and g-band photometry of the metal-poor, low-luminosity host galaxy of the super-Chandrasekhar-mass Type Ia supernova SN 2007if. Deep imaging of the host reveals its apparent magnitude to be m g = 23.15±0.06, which at the spectroscopically measured redshift of z helio = 0.07450±0.00015 corresponds to an absolute magnitude of Mg = -14.45±u0.06. Galaxy g - r color constrains the mass-to-light ratio, giving a host stellar mass estimate of log(M */M⊙) = 7.32±0.17. Balmer absorption in the stellar continuum, along with the strength of the 4000 {\AA} break, constrains the age of the dominant starburst in the galaxy to be t burst = 123+165 -77 Myr, corresponding to a main-sequence turnoff mass of M/M⊙ = 4.6+2.6 -1.4. Using the R 23 method of calculating metallicity from the fluxes of strong emission lines, we determine the host oxygen abundance to be 12 + log(O/H)KK04 = 8.01±0.09, significantly lower than any previously reported spectroscopically measured Type Ia supernova host galaxy metallicity. Our data show that SN 2007if is very likely to have originated from a young, metal-poor progenitor.",

keywords = "galaxies: dwarf, supernovae: general, supernovae: individual (SN 2007if)",

author = "M. Childress and G. Aldering and C. Aragon and P. Antilogus and S. Bailey and C. Baltay and S. Bongard and C. Buton and A. Canto and N. Chotard and Y. Copin and Fakhouri, {H. K.} and E. Gangler and M. Kerschhaggl and M. Kowalski and Hsiao, {E. Y.} and S. Loken and P. Nugent and K. Paech and R. Pain and E. Pecontal and R. Pereira and S. Perlmutter and D. Rabinowitz and K. Runge and R. Scalzo and Thomas, {R. C.} and G. Smadja and C. Tao and Weaver, {B. A.} and C. Wu",

year = "2011",

month = may,

day = "20",

doi = "10.1088/0004-637X/733/1/3",

language = "English",

volume = "733",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

Childress, M, Aldering, G, Aragon, C, Antilogus, P, Bailey, S, Baltay, C, Bongard, S, Buton, C, Canto, A, Chotard, N, Copin, Y, Fakhouri, HK, Gangler, E, Kerschhaggl, M, Kowalski, M, Hsiao, EY, Loken, S, Nugent, P, Paech, K, Pain, R, Pecontal, E, Pereira, R, Perlmutter, S, Rabinowitz, D, Runge, K, Scalzo, R, Thomas, RC, Smadja, G, Tao, C, Weaver, BA & Wu, C 2011, 'Keck observations of the young metal-poor host galaxy of the super-chandrasekhar-mass type Ia supernova SN 2007if', Astrophysical Journal, vol. 733, no. 1, 3. https://doi.org/10.1088/0004-637X/733/1/3

TY - JOUR

T1 - Keck observations of the young metal-poor host galaxy of the super-chandrasekhar-mass type Ia supernova SN 2007if

AU - Childress, M.

AU - Aldering, G.

AU - Aragon, C.

AU - Antilogus, P.

AU - Bailey, S.

AU - Baltay, C.

AU - Bongard, S.

AU - Buton, C.

AU - Canto, A.

AU - Chotard, N.

AU - Copin, Y.

AU - Fakhouri, H. K.

AU - Gangler, E.

AU - Kerschhaggl, M.

AU - Kowalski, M.

AU - Hsiao, E. Y.

AU - Loken, S.

AU - Nugent, P.

AU - Paech, K.

AU - Pain, R.

AU - Pecontal, E.

AU - Pereira, R.

AU - Perlmutter, S.

AU - Rabinowitz, D.

AU - Runge, K.

AU - Scalzo, R.

AU - Thomas, R. C.

AU - Smadja, G.

AU - Tao, C.

AU - Weaver, B. A.

AU - Wu, C.

PY - 2011/5/20

Y1 - 2011/5/20

N2 - We present Keck LRIS spectroscopy and g-band photometry of the metal-poor, low-luminosity host galaxy of the super-Chandrasekhar-mass Type Ia supernova SN 2007if. Deep imaging of the host reveals its apparent magnitude to be m g = 23.15±0.06, which at the spectroscopically measured redshift of z helio = 0.07450±0.00015 corresponds to an absolute magnitude of Mg = -14.45±u0.06. Galaxy g - r color constrains the mass-to-light ratio, giving a host stellar mass estimate of log(M */M⊙) = 7.32±0.17. Balmer absorption in the stellar continuum, along with the strength of the 4000 Å break, constrains the age of the dominant starburst in the galaxy to be t burst = 123+165 -77 Myr, corresponding to a main-sequence turnoff mass of M/M⊙ = 4.6+2.6 -1.4. Using the R 23 method of calculating metallicity from the fluxes of strong emission lines, we determine the host oxygen abundance to be 12 + log(O/H)KK04 = 8.01±0.09, significantly lower than any previously reported spectroscopically measured Type Ia supernova host galaxy metallicity. Our data show that SN 2007if is very likely to have originated from a young, metal-poor progenitor.

AB - We present Keck LRIS spectroscopy and g-band photometry of the metal-poor, low-luminosity host galaxy of the super-Chandrasekhar-mass Type Ia supernova SN 2007if. Deep imaging of the host reveals its apparent magnitude to be m g = 23.15±0.06, which at the spectroscopically measured redshift of z helio = 0.07450±0.00015 corresponds to an absolute magnitude of Mg = -14.45±u0.06. Galaxy g - r color constrains the mass-to-light ratio, giving a host stellar mass estimate of log(M */M⊙) = 7.32±0.17. Balmer absorption in the stellar continuum, along with the strength of the 4000 Å break, constrains the age of the dominant starburst in the galaxy to be t burst = 123+165 -77 Myr, corresponding to a main-sequence turnoff mass of M/M⊙ = 4.6+2.6 -1.4. Using the R 23 method of calculating metallicity from the fluxes of strong emission lines, we determine the host oxygen abundance to be 12 + log(O/H)KK04 = 8.01±0.09, significantly lower than any previously reported spectroscopically measured Type Ia supernova host galaxy metallicity. Our data show that SN 2007if is very likely to have originated from a young, metal-poor progenitor.

KW - galaxies: dwarf

KW - supernovae: general

KW - supernovae: individual (SN 2007if)

UR - http://www.scopus.com/inward/record.url?scp=79956317467&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/733/1/3

DO - 10.1088/0004-637X/733/1/3

M3 - Article

SN - 0004-637X

VL - 733

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 3

ER -

Keck observations of the young metal-poor host galaxy of the super-chandrasekhar-mass type Ia supernova SN 2007if

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