Early-time Ultraviolet Spectroscopy and Optical Follow-up Observations of the Type IIP Supernova 2021yja

Sergiy S. Vasylyev; Alexei V. Filippenko; Christian Vogl; Thomas G. Brink; Peter J. Brown; Thomas de Jaeger; Thomas Matheson; Avishay Gal-Yam; Paolo A. Mazzali; Maryam Modjaz; Kishore C. Patra; Micalyn Rowe; Nathan Smith; Schuyler D. Van Dyk; Marc Williamson; Yi Yang; WeiKang Zheng; Asia deGraw; Ori D. Fox; Elinor L. Gates; Connor Jennings; R. Michael Rich

doi:10.3847/1538-4357/ac7220

Early-time Ultraviolet Spectroscopy and Optical Follow-up Observations of the Type IIP Supernova 2021yja

Sergiy S. Vasylyev^*, Alexei V. Filippenko, Christian Vogl, Thomas G. Brink, Peter J. Brown, Thomas de Jaeger, Thomas Matheson, Avishay Gal-Yam, Paolo A. Mazzali, Maryam Modjaz, Kishore C. Patra, Micalyn Rowe, Nathan Smith, Schuyler D. Van Dyk, Marc Williamson, Yi Yang, WeiKang Zheng, Asia deGraw, Ori D. Fox, Elinor L. GatesConnor Jennings, R. Michael Rich

^*Corresponding author for this work

Department of Particle Physics and Astrophysics

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

13 Citations (Scopus)

Abstract

We present three epochs of early-time ultraviolet (UV) and optical HST/STIS spectroscopy of the young, nearby Type IIP supernova (SN) 2021yja. We complement the HST data with two earlier epochs of Swift UVOT spectroscopy. The HST and Swift UVOT spectra are consistent with those of other well-studied Type IIP SNe. The UV spectra exhibit rapid cooling at early times, while less dramatic changes are seen in the optical. We also present Lick/KAIT optical photometry up to the late-time tail phase, showing a very long plateau and shallow decline compared with other SNe IIP. Our modeling of the UV spectrum with the TARDIS radiative transfer code produces a good fit for a high-velocity explosion, a low total extinction E(B − V) = 0.07 mag, and a subsolar metallicity. We do not find a significant contribution to the UV flux from an additional heating source, such as interaction with the circumstellar medium, consistent with the observed flat plateau. Furthermore, the velocity width of the Mg ii λ2798 line is comparable to that of the hydrogen Balmer lines, suggesting that the UV emission is confined to a region close to the photosphere.

Original language	English
Article number	134
Journal	Astrophysical Journal
Volume	934
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/ac7220
Publication status	Published - 1 Aug 2022

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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Vasylyev, S. S., Filippenko, A. V., Vogl, C., Brink, T. G., Brown, P. J., Jaeger, T. D., Matheson, T., Gal-Yam, A., Mazzali, P. A., Modjaz, M., Patra, K. C., Rowe, M., Smith, N., Van Dyk, S. D., Williamson, M., Yang, Y., Zheng, W., deGraw, A., Fox, O. D., ... Rich, R. M. (2022). Early-time Ultraviolet Spectroscopy and Optical Follow-up Observations of the Type IIP Supernova 2021yja. Astrophysical Journal, 934(2), Article 134. https://doi.org/10.3847/1538-4357/ac7220

@article{89ff18574e1f435ea420ee1759a31ee3,

title = "Early-time Ultraviolet Spectroscopy and Optical Follow-up Observations of the Type IIP Supernova 2021yja",

abstract = "We present three epochs of early-time ultraviolet (UV) and optical HST/STIS spectroscopy of the young, nearby Type IIP supernova (SN) 2021yja. We complement the HST data with two earlier epochs of Swift UVOT spectroscopy. The HST and Swift UVOT spectra are consistent with those of other well-studied Type IIP SNe. The UV spectra exhibit rapid cooling at early times, while less dramatic changes are seen in the optical. We also present Lick/KAIT optical photometry up to the late-time tail phase, showing a very long plateau and shallow decline compared with other SNe IIP. Our modeling of the UV spectrum with the TARDIS radiative transfer code produces a good fit for a high-velocity explosion, a low total extinction E(B − V) = 0.07 mag, and a subsolar metallicity. We do not find a significant contribution to the UV flux from an additional heating source, such as interaction with the circumstellar medium, consistent with the observed flat plateau. Furthermore, the velocity width of the Mg ii λ2798 line is comparable to that of the hydrogen Balmer lines, suggesting that the UV emission is confined to a region close to the photosphere.",

author = "Vasylyev, {Sergiy S.} and Filippenko, {Alexei V.} and Christian Vogl and Brink, {Thomas G.} and Brown, {Peter J.} and Jaeger, {Thomas de} and Thomas Matheson and Avishay Gal-Yam and Mazzali, {Paolo A.} and Maryam Modjaz and Patra, {Kishore C.} and Micalyn Rowe and Nathan Smith and {Van Dyk}, {Schuyler D.} and Marc Williamson and Yi Yang and WeiKang Zheng and Asia deGraw and Fox, {Ori D.} and Gates, {Elinor L.} and Connor Jennings and Rich, {R. Michael}",

year = "2022",

month = aug,

day = "1",

doi = "10.3847/1538-4357/ac7220",

language = "English",

volume = "934",

journal = "Astrophysical Journal",

issn = "0004-637X",

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Vasylyev, SS, Filippenko, AV, Vogl, C, Brink, TG, Brown, PJ, Jaeger, TD, Matheson, T, Gal-Yam, A, Mazzali, PA, Modjaz, M, Patra, KC, Rowe, M, Smith, N, Van Dyk, SD, Williamson, M, Yang, Y, Zheng, W, deGraw, A, Fox, OD, Gates, EL, Jennings, C & Rich, RM 2022, 'Early-time Ultraviolet Spectroscopy and Optical Follow-up Observations of the Type IIP Supernova 2021yja', Astrophysical Journal, vol. 934, no. 2, 134. https://doi.org/10.3847/1538-4357/ac7220

TY - JOUR

T1 - Early-time Ultraviolet Spectroscopy and Optical Follow-up Observations of the Type IIP Supernova 2021yja

AU - Vasylyev, Sergiy S.

AU - Filippenko, Alexei V.

AU - Vogl, Christian

AU - Brink, Thomas G.

AU - Brown, Peter J.

AU - Jaeger, Thomas de

AU - Matheson, Thomas

AU - Gal-Yam, Avishay

AU - Mazzali, Paolo A.

AU - Modjaz, Maryam

AU - Patra, Kishore C.

AU - Rowe, Micalyn

AU - Smith, Nathan

AU - Van Dyk, Schuyler D.

AU - Williamson, Marc

AU - Yang, Yi

AU - Zheng, WeiKang

AU - deGraw, Asia

AU - Fox, Ori D.

AU - Gates, Elinor L.

AU - Jennings, Connor

AU - Rich, R. Michael

PY - 2022/8/1

Y1 - 2022/8/1

N2 - We present three epochs of early-time ultraviolet (UV) and optical HST/STIS spectroscopy of the young, nearby Type IIP supernova (SN) 2021yja. We complement the HST data with two earlier epochs of Swift UVOT spectroscopy. The HST and Swift UVOT spectra are consistent with those of other well-studied Type IIP SNe. The UV spectra exhibit rapid cooling at early times, while less dramatic changes are seen in the optical. We also present Lick/KAIT optical photometry up to the late-time tail phase, showing a very long plateau and shallow decline compared with other SNe IIP. Our modeling of the UV spectrum with the TARDIS radiative transfer code produces a good fit for a high-velocity explosion, a low total extinction E(B − V) = 0.07 mag, and a subsolar metallicity. We do not find a significant contribution to the UV flux from an additional heating source, such as interaction with the circumstellar medium, consistent with the observed flat plateau. Furthermore, the velocity width of the Mg ii λ2798 line is comparable to that of the hydrogen Balmer lines, suggesting that the UV emission is confined to a region close to the photosphere.

AB - We present three epochs of early-time ultraviolet (UV) and optical HST/STIS spectroscopy of the young, nearby Type IIP supernova (SN) 2021yja. We complement the HST data with two earlier epochs of Swift UVOT spectroscopy. The HST and Swift UVOT spectra are consistent with those of other well-studied Type IIP SNe. The UV spectra exhibit rapid cooling at early times, while less dramatic changes are seen in the optical. We also present Lick/KAIT optical photometry up to the late-time tail phase, showing a very long plateau and shallow decline compared with other SNe IIP. Our modeling of the UV spectrum with the TARDIS radiative transfer code produces a good fit for a high-velocity explosion, a low total extinction E(B − V) = 0.07 mag, and a subsolar metallicity. We do not find a significant contribution to the UV flux from an additional heating source, such as interaction with the circumstellar medium, consistent with the observed flat plateau. Furthermore, the velocity width of the Mg ii λ2798 line is comparable to that of the hydrogen Balmer lines, suggesting that the UV emission is confined to a region close to the photosphere.

UR - http://www.scopus.com/inward/record.url?scp=85135756421&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/ac7220

DO - 10.3847/1538-4357/ac7220

M3 - Article

SN - 0004-637X

VL - 934

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 134

ER -

Early-time Ultraviolet Spectroscopy and Optical Follow-up Observations of the Type IIP Supernova 2021yja

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