Optical and Infrared Spectroscopy of SN 1999ee and SN 1999ex

Mario Hamuy; José Maza; Philip A. Pinto; M. M. Phillips; Nicholas B. Suntzeff; R. D. Blum; K. A. G. Olsen; David J. Pinfield; Valentin D. Ivanov; T. Augusteijn; S. Brillant; M. Chadid; J. -G. Cuby; V. Doublier; O. R. Hainaut; E. Le Floc'h; C. Lidman; Monika G. Petr-Gotzens; E. Pompei; L. Vanzi

doi:10.1086/340968

Optical and Infrared Spectroscopy of SN 1999ee and SN 1999ex

Mario Hamuy, José Maza, Philip A. Pinto, M. M. Phillips, Nicholas B. Suntzeff, R. D. Blum, K. A. G. Olsen, David J. Pinfield, Valentin D. Ivanov, T. Augusteijn, S. Brillant, M. Chadid, J. -G. Cuby, V. Doublier, O. R. Hainaut, E. Le Floc'h, C. Lidman, Monika G. Petr-Gotzens, E. Pompei, L. Vanzi

Research School of Astronomy & Astrophysics

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

150 Citations (Scopus)

Abstract

We report optical and infrared spectroscopic observations of the Type Ia SN 1999ee and the Type Ib/c SN 1999ex, both of which were hosted by the galaxy IC 5179. For SN 1999ee we obtained a continuous sequence with an unprecedented wavelength and temporal coverage beginning 9 days before maximum light and extending through day 42. Before maximum light SN 1999ee displayed a normal spectrum with a strong Si II λ6355 absorption, thus showing that not all slow-declining supernovae (SNe) are spectroscopically peculiar at these evolutionary phases. A comparative study of the infrared spectra of SN 1999ee and other Type Ia SNe shows that there is a remarkable homogeneity among the Branch-normal SNe Ia during their first 60 days of evolution. SN 1991bg-like objects, on the other hand, display spectroscopic peculiarities at infrared wavelengths. SN 1999ex was characterized by the lack of hydrogen lines, weak optical He I lines, and strong He I λλ10830, 20581, thus providing an example of an intermediate case between pure Ib and Ic supernovae. We conclude, therefore, that SN 1999ex provides the first clear evidence for a link between the Ib and Ic classes and that there is a continuous spectroscopic sequence ranging from the He-deficient SNe Ic to the SNe Ib, which are characterized by strong optical He I lines. Based on observations collected at the European Southern Observatory, Chile (program ESO 164.H-0376).

Original language	English
Pages (from-to)	417-429
Number of pages	13
Journal	Astronomical Journal
Volume	124
DOIs	https://doi.org/10.1086/340968
Publication status	Published - 1 Jul 2002

Access to Document

10.1086/340968

https://ui.adsabs.harvard.edu/abs/2002AJ....124..417H

Cite this

Hamuy, M., Maza, J., Pinto, P. A., Phillips, M. M., Suntzeff, N. B., Blum, R. D., Olsen, K. A. G., Pinfield, D. J., Ivanov, V. D., Augusteijn, T., Brillant, S., Chadid, M., Cuby, J. .-G., Doublier, V., Hainaut, O. R., Le Floc'h, E., Lidman, C., Petr-Gotzens, M. G., Pompei, E., & Vanzi, L. (2002). Optical and Infrared Spectroscopy of SN 1999ee and SN 1999ex. Astronomical Journal, 124, 417-429. https://doi.org/10.1086/340968

@article{cbd891debc2345ba9351ba876aa7be77,

title = "Optical and Infrared Spectroscopy of SN 1999ee and SN 1999ex",

abstract = "We report optical and infrared spectroscopic observations of the Type Ia SN 1999ee and the Type Ib/c SN 1999ex, both of which were hosted by the galaxy IC 5179. For SN 1999ee we obtained a continuous sequence with an unprecedented wavelength and temporal coverage beginning 9 days before maximum light and extending through day 42. Before maximum light SN 1999ee displayed a normal spectrum with a strong Si II λ6355 absorption, thus showing that not all slow-declining supernovae (SNe) are spectroscopically peculiar at these evolutionary phases. A comparative study of the infrared spectra of SN 1999ee and other Type Ia SNe shows that there is a remarkable homogeneity among the Branch-normal SNe Ia during their first 60 days of evolution. SN 1991bg-like objects, on the other hand, display spectroscopic peculiarities at infrared wavelengths. SN 1999ex was characterized by the lack of hydrogen lines, weak optical He I lines, and strong He I λλ10830, 20581, thus providing an example of an intermediate case between pure Ib and Ic supernovae. We conclude, therefore, that SN 1999ex provides the first clear evidence for a link between the Ib and Ic classes and that there is a continuous spectroscopic sequence ranging from the He-deficient SNe Ic to the SNe Ib, which are characterized by strong optical He I lines. Based on observations collected at the European Southern Observatory, Chile (program ESO 164.H-0376).",

keywords = "supernovae: individual (1999ee), supernovae: individual (1999ex), Astrophysics",

author = "Mario Hamuy and Jos{\'e} Maza and Pinto, {Philip A.} and Phillips, {M. M.} and Suntzeff, {Nicholas B.} and Blum, {R. D.} and Olsen, {K. A. G.} and Pinfield, {David J.} and Ivanov, {Valentin D.} and T. Augusteijn and S. Brillant and M. Chadid and Cuby, {J. -G.} and V. Doublier and Hainaut, {O. R.} and {Le Floc'h}, E. and C. Lidman and Petr-Gotzens, {Monika G.} and E. Pompei and L. Vanzi",

year = "2002",

month = jul,

day = "1",

doi = "10.1086/340968",

language = "English",

volume = "124",

pages = "417--429",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

}

Hamuy, M, Maza, J, Pinto, PA, Phillips, MM, Suntzeff, NB, Blum, RD, Olsen, KAG, Pinfield, DJ, Ivanov, VD, Augusteijn, T, Brillant, S, Chadid, M, Cuby, J-G, Doublier, V, Hainaut, OR, Le Floc'h, E, Lidman, C, Petr-Gotzens, MG, Pompei, E & Vanzi, L 2002, 'Optical and Infrared Spectroscopy of SN 1999ee and SN 1999ex', Astronomical Journal, vol. 124, pp. 417-429. https://doi.org/10.1086/340968

TY - JOUR

T1 - Optical and Infrared Spectroscopy of SN 1999ee and SN 1999ex

AU - Hamuy, Mario

AU - Maza, José

AU - Pinto, Philip A.

AU - Phillips, M. M.

AU - Suntzeff, Nicholas B.

AU - Blum, R. D.

AU - Olsen, K. A. G.

AU - Pinfield, David J.

AU - Ivanov, Valentin D.

AU - Augusteijn, T.

AU - Brillant, S.

AU - Chadid, M.

AU - Cuby, J. -G.

AU - Doublier, V.

AU - Hainaut, O. R.

AU - Le Floc'h, E.

AU - Lidman, C.

AU - Petr-Gotzens, Monika G.

AU - Pompei, E.

AU - Vanzi, L.

PY - 2002/7/1

Y1 - 2002/7/1

N2 - We report optical and infrared spectroscopic observations of the Type Ia SN 1999ee and the Type Ib/c SN 1999ex, both of which were hosted by the galaxy IC 5179. For SN 1999ee we obtained a continuous sequence with an unprecedented wavelength and temporal coverage beginning 9 days before maximum light and extending through day 42. Before maximum light SN 1999ee displayed a normal spectrum with a strong Si II λ6355 absorption, thus showing that not all slow-declining supernovae (SNe) are spectroscopically peculiar at these evolutionary phases. A comparative study of the infrared spectra of SN 1999ee and other Type Ia SNe shows that there is a remarkable homogeneity among the Branch-normal SNe Ia during their first 60 days of evolution. SN 1991bg-like objects, on the other hand, display spectroscopic peculiarities at infrared wavelengths. SN 1999ex was characterized by the lack of hydrogen lines, weak optical He I lines, and strong He I λλ10830, 20581, thus providing an example of an intermediate case between pure Ib and Ic supernovae. We conclude, therefore, that SN 1999ex provides the first clear evidence for a link between the Ib and Ic classes and that there is a continuous spectroscopic sequence ranging from the He-deficient SNe Ic to the SNe Ib, which are characterized by strong optical He I lines. Based on observations collected at the European Southern Observatory, Chile (program ESO 164.H-0376).

AB - We report optical and infrared spectroscopic observations of the Type Ia SN 1999ee and the Type Ib/c SN 1999ex, both of which were hosted by the galaxy IC 5179. For SN 1999ee we obtained a continuous sequence with an unprecedented wavelength and temporal coverage beginning 9 days before maximum light and extending through day 42. Before maximum light SN 1999ee displayed a normal spectrum with a strong Si II λ6355 absorption, thus showing that not all slow-declining supernovae (SNe) are spectroscopically peculiar at these evolutionary phases. A comparative study of the infrared spectra of SN 1999ee and other Type Ia SNe shows that there is a remarkable homogeneity among the Branch-normal SNe Ia during their first 60 days of evolution. SN 1991bg-like objects, on the other hand, display spectroscopic peculiarities at infrared wavelengths. SN 1999ex was characterized by the lack of hydrogen lines, weak optical He I lines, and strong He I λλ10830, 20581, thus providing an example of an intermediate case between pure Ib and Ic supernovae. We conclude, therefore, that SN 1999ex provides the first clear evidence for a link between the Ib and Ic classes and that there is a continuous spectroscopic sequence ranging from the He-deficient SNe Ic to the SNe Ib, which are characterized by strong optical He I lines. Based on observations collected at the European Southern Observatory, Chile (program ESO 164.H-0376).

KW - supernovae: individual (1999ee)

KW - supernovae: individual (1999ex)

KW - Astrophysics

U2 - 10.1086/340968

DO - 10.1086/340968

M3 - Article

SN - 0004-6256

VL - 124

SP - 417

EP - 429

JO - Astronomical Journal

JF - Astronomical Journal

ER -

Optical and Infrared Spectroscopy of SN 1999ee and SN 1999ex

Abstract

Access to Document

Fingerprint

Cite this