Ca hnk: The Calcium-rich Transient Supernova 2016hnk from a Helium Shell Detonation of a Sub-Chandrasekhar White Dwarf

Wynn V. Jacobson-Galán; Wynn V. Jacobson-Galán; Wynn V. Jacobson-Galán; Abigail Polin; Abigail Polin; Abigail Polin; Ryan J. Foley; Georgios Dimitriadis; Charles D. Kilpatrick; Raffaella Margutti; Raffaella Margutti; David A. Coulter; Saurabh W. Jha; David O. Jones; Robert P. Kirshner; Yen Chen Pan; Anthony L. Piro; Armin Rest; Armin Rest; César Rojas-Bravo

doi:10.3847/1538-4357/ab94b8

Ca hnk: The Calcium-rich Transient Supernova 2016hnk from a Helium Shell Detonation of a Sub-Chandrasekhar White Dwarf

Wynn V. Jacobson-Galán, Wynn V. Jacobson-Galán, Wynn V. Jacobson-Galán, Abigail Polin, Abigail Polin, Abigail Polin, Ryan J. Foley, Georgios Dimitriadis, Charles D. Kilpatrick, Raffaella Margutti, Raffaella Margutti, David A. Coulter, Saurabh W. Jha, David O. Jones, Robert P. Kirshner, Yen Chen Pan, Anthony L. Piro, Armin Rest, Armin Rest, César Rojas-Bravo

Physics and Astronomy

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Abstract

We present observations and modeling of SN 2016hnk, a Ca-rich supernova (SN) that is consistent with being the result of a He-shell double-detonation explosion of a C/O white dwarf. We find that SN 2016hnk is intrinsically red relative to typical thermonuclear SNe and has a relatively low peak luminosity ( M B = -15.4 mag), setting it apart from low-luminosity SNe Ia. SN 2016hnk has a fast-rising light curve that is consistent with other Ca-rich transients (t r = 15 days). We determine that SN 2016hnk produced 0.03 ± 0.01 M o˙ of 56Ni and 0.9 ± 0.3 M o˙ of ejecta. The photospheric spectra show strong, high-velocity Ca ii absorption and significant line blanketing at λ < 5000 Å, making it distinct from typical (SN 2005E-like) Ca-rich SNe. SN 2016hnk is remarkably similar to SN 2018byg, which was modeled as a He-shell double-detonation explosion. We demonstrate that the spectra and light curves of SN 2016hnk are well modeled by the detonation of a 0.02 M⊙ helium shell on the surface of a 0.85 M⊙ C/O white dwarf. This analysis highlights the second observed case of a He-shell double-detonation and suggests a specific thermonuclear explosion that is physically distinct from SNe that are defined simply by their low luminosities and strong [Ca ii] emission.

Original language	English (US)
Article number	165
Journal	Astrophysical Journal
Volume	896
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/ab94b8
State	Published - Jun 20 2020

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-4357/ab94b8

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Jacobson-Galán, W. V., Jacobson-Galán, W. V., Jacobson-Galán, W. V., Polin, A., Polin, A., Polin, A., Foley, R. J., Dimitriadis, G., Kilpatrick, C. D., Margutti, R., Margutti, R., Coulter, D. A., Jha, S. W., Jones, D. O., Kirshner, R. P., Pan, Y. C., Piro, A. L., Rest, A., Rest, A., & Rojas-Bravo, C. (2020). Ca hnk: The Calcium-rich Transient Supernova 2016hnk from a Helium Shell Detonation of a Sub-Chandrasekhar White Dwarf. Astrophysical Journal, 896(2), Article 165. https://doi.org/10.3847/1538-4357/ab94b8

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title = "Ca hnk: The Calcium-rich Transient Supernova 2016hnk from a Helium Shell Detonation of a Sub-Chandrasekhar White Dwarf",

abstract = "We present observations and modeling of SN 2016hnk, a Ca-rich supernova (SN) that is consistent with being the result of a He-shell double-detonation explosion of a C/O white dwarf. We find that SN 2016hnk is intrinsically red relative to typical thermonuclear SNe and has a relatively low peak luminosity ( M B = -15.4 mag), setting it apart from low-luminosity SNe Ia. SN 2016hnk has a fast-rising light curve that is consistent with other Ca-rich transients (t r = 15 days). We determine that SN 2016hnk produced 0.03 ± 0.01 M o˙ of 56Ni and 0.9 ± 0.3 M o˙ of ejecta. The photospheric spectra show strong, high-velocity Ca ii absorption and significant line blanketing at λ < 5000 {\AA}, making it distinct from typical (SN 2005E-like) Ca-rich SNe. SN 2016hnk is remarkably similar to SN 2018byg, which was modeled as a He-shell double-detonation explosion. We demonstrate that the spectra and light curves of SN 2016hnk are well modeled by the detonation of a 0.02 M⊙ helium shell on the surface of a 0.85 M⊙ C/O white dwarf. This analysis highlights the second observed case of a He-shell double-detonation and suggests a specific thermonuclear explosion that is physically distinct from SNe that are defined simply by their low luminosities and strong [Ca ii] emission.",

author = "Jacobson-Gal{\'a}n, {Wynn V.} and Jacobson-Gal{\'a}n, {Wynn V.} and Jacobson-Gal{\'a}n, {Wynn V.} and Abigail Polin and Abigail Polin and Abigail Polin and Foley, {Ryan J.} and Georgios Dimitriadis and Kilpatrick, {Charles D.} and Raffaella Margutti and Raffaella Margutti and Coulter, {David A.} and Jha, {Saurabh W.} and Jones, {David O.} and Kirshner, {Robert P.} and Pan, {Yen Chen} and Piro, {Anthony L.} and Armin Rest and Armin Rest and C{\'e}sar Rojas-Bravo",

year = "2020",

month = jun,

day = "20",

doi = "10.3847/1538-4357/ab94b8",

language = "English (US)",

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journal = "Astrophysical Journal",

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Jacobson-Galán, WV, Jacobson-Galán, WV, Jacobson-Galán, WV, Polin, A, Polin, A, Polin, A, Foley, RJ, Dimitriadis, G, Kilpatrick, CD, Margutti, R, Margutti, R, Coulter, DA, Jha, SW, Jones, DO, Kirshner, RP, Pan, YC, Piro, AL, Rest, A, Rest, A & Rojas-Bravo, C 2020, 'Ca hnk: The Calcium-rich Transient Supernova 2016hnk from a Helium Shell Detonation of a Sub-Chandrasekhar White Dwarf', Astrophysical Journal, vol. 896, no. 2, 165. https://doi.org/10.3847/1538-4357/ab94b8

TY - JOUR

T1 - Ca hnk

T2 - The Calcium-rich Transient Supernova 2016hnk from a Helium Shell Detonation of a Sub-Chandrasekhar White Dwarf

AU - Jacobson-Galán, Wynn V.

AU - Polin, Abigail

AU - Foley, Ryan J.

AU - Dimitriadis, Georgios

AU - Kilpatrick, Charles D.

AU - Margutti, Raffaella

AU - Coulter, David A.

AU - Jha, Saurabh W.

AU - Jones, David O.

AU - Kirshner, Robert P.

AU - Pan, Yen Chen

AU - Piro, Anthony L.

AU - Rest, Armin

AU - Rojas-Bravo, César

PY - 2020/6/20

Y1 - 2020/6/20

N2 - We present observations and modeling of SN 2016hnk, a Ca-rich supernova (SN) that is consistent with being the result of a He-shell double-detonation explosion of a C/O white dwarf. We find that SN 2016hnk is intrinsically red relative to typical thermonuclear SNe and has a relatively low peak luminosity ( M B = -15.4 mag), setting it apart from low-luminosity SNe Ia. SN 2016hnk has a fast-rising light curve that is consistent with other Ca-rich transients (t r = 15 days). We determine that SN 2016hnk produced 0.03 ± 0.01 M o˙ of 56Ni and 0.9 ± 0.3 M o˙ of ejecta. The photospheric spectra show strong, high-velocity Ca ii absorption and significant line blanketing at λ < 5000 Å, making it distinct from typical (SN 2005E-like) Ca-rich SNe. SN 2016hnk is remarkably similar to SN 2018byg, which was modeled as a He-shell double-detonation explosion. We demonstrate that the spectra and light curves of SN 2016hnk are well modeled by the detonation of a 0.02 M⊙ helium shell on the surface of a 0.85 M⊙ C/O white dwarf. This analysis highlights the second observed case of a He-shell double-detonation and suggests a specific thermonuclear explosion that is physically distinct from SNe that are defined simply by their low luminosities and strong [Ca ii] emission.

AB - We present observations and modeling of SN 2016hnk, a Ca-rich supernova (SN) that is consistent with being the result of a He-shell double-detonation explosion of a C/O white dwarf. We find that SN 2016hnk is intrinsically red relative to typical thermonuclear SNe and has a relatively low peak luminosity ( M B = -15.4 mag), setting it apart from low-luminosity SNe Ia. SN 2016hnk has a fast-rising light curve that is consistent with other Ca-rich transients (t r = 15 days). We determine that SN 2016hnk produced 0.03 ± 0.01 M o˙ of 56Ni and 0.9 ± 0.3 M o˙ of ejecta. The photospheric spectra show strong, high-velocity Ca ii absorption and significant line blanketing at λ < 5000 Å, making it distinct from typical (SN 2005E-like) Ca-rich SNe. SN 2016hnk is remarkably similar to SN 2018byg, which was modeled as a He-shell double-detonation explosion. We demonstrate that the spectra and light curves of SN 2016hnk are well modeled by the detonation of a 0.02 M⊙ helium shell on the surface of a 0.85 M⊙ C/O white dwarf. This analysis highlights the second observed case of a He-shell double-detonation and suggests a specific thermonuclear explosion that is physically distinct from SNe that are defined simply by their low luminosities and strong [Ca ii] emission.

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U2 - 10.3847/1538-4357/ab94b8

DO - 10.3847/1538-4357/ab94b8

M3 - Article

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SN - 0004-637X

VL - 896

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 165

ER -

Ca hnk: The Calcium-rich Transient Supernova 2016hnk from a Helium Shell Detonation of a Sub-Chandrasekhar White Dwarf

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Optical light curves of SN 2016hnk

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Ca hnk: The Calcium-rich Transient Supernova 2016hnk from a Helium Shell Detonation of a Sub-Chandrasekhar White Dwarf

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ASJC Scopus subject areas

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Optical light curves of SN 2016hnk

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