Red and Reddened: Ultraviolet through Near-infrared Observations of Type Ia Supernova 2017erp

Peter J. Brown; Griffin Hosseinzadeh; Saurabh W. Jha; David Sand; Ethan Vieira; Xiaofeng Wang; Mi Dai; Kyle G. Dettman; Jeremy Mould; Syed Uddin; Lifan Wang; Iair Arcavi; Joao Bento; Chris R. Burns; Tiara Diamond; Daichi Hiramatsu; D. Andrew Howell; E. Y. Hsiao; G. H. Marion; Curtis McCully; Peter A. Milne; Davron Mirzaqulov; Ashley J. Ruiter; Stefano Valenti; Danfeng Xiang

doi:10.3847/1538-4357/ab1a3f

Red and Reddened: Ultraviolet through Near-infrared Observations of Type Ia Supernova 2017erp

Peter J. Brown, Griffin Hosseinzadeh, Saurabh W. Jha, David Sand, Ethan Vieira, Xiaofeng Wang, Mi Dai, Kyle G. Dettman, Jeremy Mould, Syed Uddin, Lifan Wang, Iair Arcavi, Joao Bento, Chris R. Burns, Tiara Diamond, Daichi Hiramatsu, D. Andrew Howell, E. Y. Hsiao, G. H. Marion, Curtis McCullyPeter A. Milne, Davron Mirzaqulov, Ashley J. Ruiter, Stefano Valenti, Danfeng Xiang

School of Physics and Astronomy

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23 Scopus citations

Abstract

We present space-based ultraviolet/optical photometry and spectroscopy with the Swift Ultra-Violet/Optical Telescope and Hubble Space Telescope (HST), respectively, along with ground-based optical photometry and spectroscopy and near-infrared spectroscopy of supernova SN 2017erp. The optical light curves and spectra are consistent with a normal SN Ia. Compared to previous photometric samples in the near-ultraviolet (NUV), SN 2017erp has UV colors that are redder than NUV-blue SNe Ia corrected to similar optical colors. The chromatic difference between SNe 2011fe and 2017erp is dominated by the intrinsic differences in the UV rather than the expected dust reddening. This chromatic difference is similar to the SALT2 color law, derived from rest-frame ultraviolet photometry of higher redshift SNe Ia. Differentiating between intrinsic UV diversity and dust reddening can have important consequences for determining cosmological distances with rest-frame ultraviolet photometry. This ultraviolet spectroscopic series is the first from HST of a normal, albeit reddened, NUV-red SN Ia and is important for analyzing SNe Ia with intrinsically redder NUV colors. We show model comparisons suggesting that metallicity could be the physical difference between NUV-blue and NUV-red SNe Ia, with emission peaks from reverse fluorescence near 3000 Å implying a factor of ∼10 higher metallicity in the upper layers of SN 2017erp compared to SN 2011fe. Metallicity estimates are very model dependent, however, and there are multiple effects in the UV. Further models and UV spectra of SNe Ia are needed to explore the diversity of SNe Ia, which show seemingly independent differences in the near-UV peaks and mid-UV flux levels.

Original language	English
Article number	152
Journal	Astrophysical Journal
Volume	877
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/ab1a3f
State	Published - 1 Jun 2019

Funding

Funders	Funder number
National Science Foundation	1813176, 1817099
Directorate for Mathematical and Physical Sciences	1813466, 1821987, 1821967, 1813708, 1313484

Keywords

dust, extinction
supernovae: general
supernovae: individual (SN2017erp, SN2011fe, SN2011by)

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10.3847/1538-4357/ab1a3f

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Brown, P. J., Hosseinzadeh, G., Jha, S. W., Sand, D., Vieira, E., Wang, X., Dai, M., Dettman, K. G., Mould, J., Uddin, S., Wang, L., Arcavi, I., Bento, J., Burns, C. R., Diamond, T., Hiramatsu, D., Howell, D. A., Hsiao, E. Y., Marion, G. H., ... Xiang, D. (2019). Red and Reddened: Ultraviolet through Near-infrared Observations of Type Ia Supernova 2017erp. Astrophysical Journal, 877(2), Article 152. https://doi.org/10.3847/1538-4357/ab1a3f

@article{23d2bf89bd2d432a92fda71e00b59a30,

title = "Red and Reddened: Ultraviolet through Near-infrared Observations of Type Ia Supernova 2017erp",

abstract = "We present space-based ultraviolet/optical photometry and spectroscopy with the Swift Ultra-Violet/Optical Telescope and Hubble Space Telescope (HST), respectively, along with ground-based optical photometry and spectroscopy and near-infrared spectroscopy of supernova SN 2017erp. The optical light curves and spectra are consistent with a normal SN Ia. Compared to previous photometric samples in the near-ultraviolet (NUV), SN 2017erp has UV colors that are redder than NUV-blue SNe Ia corrected to similar optical colors. The chromatic difference between SNe 2011fe and 2017erp is dominated by the intrinsic differences in the UV rather than the expected dust reddening. This chromatic difference is similar to the SALT2 color law, derived from rest-frame ultraviolet photometry of higher redshift SNe Ia. Differentiating between intrinsic UV diversity and dust reddening can have important consequences for determining cosmological distances with rest-frame ultraviolet photometry. This ultraviolet spectroscopic series is the first from HST of a normal, albeit reddened, NUV-red SN Ia and is important for analyzing SNe Ia with intrinsically redder NUV colors. We show model comparisons suggesting that metallicity could be the physical difference between NUV-blue and NUV-red SNe Ia, with emission peaks from reverse fluorescence near 3000 {\AA} implying a factor of ∼10 higher metallicity in the upper layers of SN 2017erp compared to SN 2011fe. Metallicity estimates are very model dependent, however, and there are multiple effects in the UV. Further models and UV spectra of SNe Ia are needed to explore the diversity of SNe Ia, which show seemingly independent differences in the near-UV peaks and mid-UV flux levels.",

keywords = "dust, extinction, supernovae: general, supernovae: individual (SN2017erp, SN2011fe, SN2011by)",

author = "Brown, {Peter J.} and Griffin Hosseinzadeh and Jha, {Saurabh W.} and David Sand and Ethan Vieira and Xiaofeng Wang and Mi Dai and Dettman, {Kyle G.} and Jeremy Mould and Syed Uddin and Lifan Wang and Iair Arcavi and Joao Bento and Burns, {Chris R.} and Tiara Diamond and Daichi Hiramatsu and Howell, {D. Andrew} and Hsiao, {E. Y.} and Marion, {G. H.} and Curtis McCully and Milne, {Peter A.} and Davron Mirzaqulov and Ruiter, {Ashley J.} and Stefano Valenti and Danfeng Xiang",

year = "2019",

month = jun,

day = "1",

doi = "10.3847/1538-4357/ab1a3f",

language = "אנגלית",

volume = "877",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "2",

}

Brown, PJ, Hosseinzadeh, G, Jha, SW, Sand, D, Vieira, E, Wang, X, Dai, M, Dettman, KG, Mould, J, Uddin, S, Wang, L, Arcavi, I, Bento, J, Burns, CR, Diamond, T, Hiramatsu, D, Howell, DA, Hsiao, EY, Marion, GH, McCully, C, Milne, PA, Mirzaqulov, D, Ruiter, AJ, Valenti, S & Xiang, D 2019, 'Red and Reddened: Ultraviolet through Near-infrared Observations of Type Ia Supernova 2017erp', Astrophysical Journal, vol. 877, no. 2, 152. https://doi.org/10.3847/1538-4357/ab1a3f

TY - JOUR

T1 - Red and Reddened

T2 - Ultraviolet through Near-infrared Observations of Type Ia Supernova 2017erp

AU - Brown, Peter J.

AU - Hosseinzadeh, Griffin

AU - Jha, Saurabh W.

AU - Sand, David

AU - Vieira, Ethan

AU - Wang, Xiaofeng

AU - Dai, Mi

AU - Dettman, Kyle G.

AU - Mould, Jeremy

AU - Uddin, Syed

AU - Wang, Lifan

AU - Arcavi, Iair

AU - Bento, Joao

AU - Burns, Chris R.

AU - Diamond, Tiara

AU - Hiramatsu, Daichi

AU - Howell, D. Andrew

AU - Hsiao, E. Y.

AU - Marion, G. H.

AU - McCully, Curtis

AU - Milne, Peter A.

AU - Mirzaqulov, Davron

AU - Ruiter, Ashley J.

AU - Valenti, Stefano

AU - Xiang, Danfeng

PY - 2019/6/1

Y1 - 2019/6/1

N2 - We present space-based ultraviolet/optical photometry and spectroscopy with the Swift Ultra-Violet/Optical Telescope and Hubble Space Telescope (HST), respectively, along with ground-based optical photometry and spectroscopy and near-infrared spectroscopy of supernova SN 2017erp. The optical light curves and spectra are consistent with a normal SN Ia. Compared to previous photometric samples in the near-ultraviolet (NUV), SN 2017erp has UV colors that are redder than NUV-blue SNe Ia corrected to similar optical colors. The chromatic difference between SNe 2011fe and 2017erp is dominated by the intrinsic differences in the UV rather than the expected dust reddening. This chromatic difference is similar to the SALT2 color law, derived from rest-frame ultraviolet photometry of higher redshift SNe Ia. Differentiating between intrinsic UV diversity and dust reddening can have important consequences for determining cosmological distances with rest-frame ultraviolet photometry. This ultraviolet spectroscopic series is the first from HST of a normal, albeit reddened, NUV-red SN Ia and is important for analyzing SNe Ia with intrinsically redder NUV colors. We show model comparisons suggesting that metallicity could be the physical difference between NUV-blue and NUV-red SNe Ia, with emission peaks from reverse fluorescence near 3000 Å implying a factor of ∼10 higher metallicity in the upper layers of SN 2017erp compared to SN 2011fe. Metallicity estimates are very model dependent, however, and there are multiple effects in the UV. Further models and UV spectra of SNe Ia are needed to explore the diversity of SNe Ia, which show seemingly independent differences in the near-UV peaks and mid-UV flux levels.

AB - We present space-based ultraviolet/optical photometry and spectroscopy with the Swift Ultra-Violet/Optical Telescope and Hubble Space Telescope (HST), respectively, along with ground-based optical photometry and spectroscopy and near-infrared spectroscopy of supernova SN 2017erp. The optical light curves and spectra are consistent with a normal SN Ia. Compared to previous photometric samples in the near-ultraviolet (NUV), SN 2017erp has UV colors that are redder than NUV-blue SNe Ia corrected to similar optical colors. The chromatic difference between SNe 2011fe and 2017erp is dominated by the intrinsic differences in the UV rather than the expected dust reddening. This chromatic difference is similar to the SALT2 color law, derived from rest-frame ultraviolet photometry of higher redshift SNe Ia. Differentiating between intrinsic UV diversity and dust reddening can have important consequences for determining cosmological distances with rest-frame ultraviolet photometry. This ultraviolet spectroscopic series is the first from HST of a normal, albeit reddened, NUV-red SN Ia and is important for analyzing SNe Ia with intrinsically redder NUV colors. We show model comparisons suggesting that metallicity could be the physical difference between NUV-blue and NUV-red SNe Ia, with emission peaks from reverse fluorescence near 3000 Å implying a factor of ∼10 higher metallicity in the upper layers of SN 2017erp compared to SN 2011fe. Metallicity estimates are very model dependent, however, and there are multiple effects in the UV. Further models and UV spectra of SNe Ia are needed to explore the diversity of SNe Ia, which show seemingly independent differences in the near-UV peaks and mid-UV flux levels.

KW - dust, extinction

KW - supernovae: general

KW - supernovae: individual (SN2017erp, SN2011fe, SN2011by)

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JO - Astrophysical Journal

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ER -

Red and Reddened: Ultraviolet through Near-infrared Observations of Type Ia Supernova 2017erp

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