SN 2018hna: 1987A-like Supernova with a Signature of Shock Breakout

Singh, Avinash; Sahu, D. K.; Anupama, G. C.; Kumar, Brajesh; Kumar, Harsh; Yamanaka, Masahito; Бакланов, П. В.; Tominaga, Nozomu; Блинников, С. И.; Maeda, Keiichi; Dutta, Anirban; Bhalerao, V.; Anche, Ramya M.; Barway, Sudhanshu; Akitaya, Hiroshi; Nakaoka, Tatsuya; Kawabata, Miho; Kawabata, Koji S.; Sasada, Mahito; Takagi, Kengo; Maehara, Hiroyuki; Isogai, Keisuke; Kino, Motoki; Taguchi, Kenta; Nagao, Takashi

doi:10.3847/2041-8213/ab3d44

Cited by 14 publications

(44 citation statements)

References 51 publications

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“…SN 2018hna, Type II (SN 1987A-like), was discovered on 2018 Oct 22 UT used throughout; (37) and classified as SN II (38) . The photometric and spectroscopic evolution showed similarities to those of SN 1987A, indicating that SN 2018hna was a similar explosion of a BSG (23) . The Galactic extinction for this SN was A J = 0.009 and the reddening was E(B − V ) MW = 0.01 mags (39) .…”

Section: Methods Infrared Spectropolarimetry Observationsmentioning

confidence: 73%

“…Ref. (23) reported optical photometry and spectroscopy and constrained the explosion date and the V -band maximum light to 2018 Oct 19.8 and 2019 Jan 15.3 respectively. They detected shock-cooling emission from the early light curve, directly constraining the progenitor to be a R ∼ 50 R BSG.…”

Section: Methods Infrared Spectropolarimetry Observationsmentioning

confidence: 99%

“…We observed the following SNe with WIRC+Pol. SN 2018hna, a Type II-peculiar (SN 1987Alike) (23) , shows a significant p ∼2% (> 4σ) per spectral channel at 182 d post-explosion (95 d after peak light). SN 2020oi, a Type Ic stripped-envelope SN in Messier 100, has p 0.9% (3σ) per spectral channel at peak light (p = 0.37 ± 0.09% broadband).…”

Section: Mainmentioning

confidence: 99%

“…The public ZTF photometry of SN 2018hna has been presented in ref. (23) and of SN 2020oi is presented in ref. (49) .…”

Section: Corresponding Author Samaporn Tinyanontmentioning

confidence: 99%

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Infrared spectropolarimetric detection of intrinsic polarization from a core-collapse supernova

et al. 2021

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Massive stars die an explosive death as a core-collapse supernova (CCSN). The exact physical processes that cause the collapsing star to rebound into an explosion is not well-understood, and the key in resolving this issue may lie in the measurement of the shape of CCSNe ejecta. Spectropolarimetry is the only way to perform this measurement for CCSNe outside of the Milky Way and Magellanic Clouds. We present an infrared (IR) spectropolarimetric detection of a CCSN, enabled by the new highly sensitive WIRC+Pol instrument at Palomar Observatory, that can observe CCSNe (M = −17 mags) out to 20 Mpc to ∼0.1% polarimetric precision. IR spectropolarimetry is less affected than optical by dust scattering in the circumstellar and interstellar media, thereby providing a more unbiased probe of the intrinsic geometry of the SN ejecta. SN 2018hna, a SN 1987A-like explosion, shows 2.0 ± 0.3% continuum polarization in the J band oriented at ∼160°on-sky at 182 d after the explosion. Assuming prolate geometry like in SN 1987A, we infer an ejecta axis ratio of <0.48 with the axis of symmetry pointing at 70°position angle. The axis ratio is similar to that of SN 1987A suggesting that they may share intrinsic geometry and inclination angle. Our data do not rule out oblate ejecta. We also observe one other core-collapse and two thermonuclear SNe in the J band. SN 2020oi, a stripped-envelope Type Ic SN in Messier 100 has p = 0.37 ± 0.09% at peak light, indicative of either a 10% asymmetry or host interstellar polarization. The SNe Ia, 2019ein and 2020ue have p <0.33% and <1.08% near peak light, indicative of asymmetries of less than 10% and 20%, respectively.

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Section: Methods Infrared Spectropolarimetry Observationsmentioning

confidence: 73%

Section: Methods Infrared Spectropolarimetry Observationsmentioning

confidence: 99%

Section: Mainmentioning

confidence: 99%

“…The public ZTF photometry of SN 2018hna has been presented in ref. (23) and of SN 2020oi is presented in ref. (49) .…”

Section: Corresponding Author Samaporn Tinyanontmentioning

confidence: 99%

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Infrared spectropolarimetric detection of intrinsic polarization from a core-collapse supernova

et al. 2021

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“…GIT has often followed up on peculiar events, which can yield high scientific returns. For instance, SN 2018hna-an SN 1987A-like explosion with shock breakout and a blue supergiant progenitor-has been studied in detail by Singh et al (2019;Figure 7, left). A type Iax event, SN 2020sck, has been studied in Dutta et al (2022).…”

Section: Supernovaementioning

confidence: 99%

India’s First Robotic Eye for Time-domain Astrophysics: The GROWTH-India Telescope

Kumar¹,

Bhalerao²,

Anupama³

et al. 2022

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We present the design and performance of the GROWTH-India telescope, a 0.7 m robotic telescope dedicated to time-domain astronomy. The telescope is equipped with a 4k back-illuminated camera that gives a 0.°82 field of view and a sensitivity of m g′ ∼ 20.5 in 5 minute exposures. Custom software handles observatory operations: attaining high on-sky observing efficiencies (≳80%) and allowing rapid response to targets of opportunity. The data processing pipelines are capable of performing point-spread function photometry as well as image subtraction for transient searches. We also present an overview of the GROWTH-India telescope’s contributions to the studies of gamma-ray bursts, the electromagnetic counterparts to gravitational wave sources, supernovae, novae, and solar system objects.

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First systematic high-precision survey of bright supernovae

Paraskeva

Bonanos

Liakos

et al. 2020

A&A

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Rapid variability before and near the maximum brightness of supernovae has the potential to provide a better understanding of nearly every aspect of supernovae, from the physics of the explosion up to their progenitors and the circumstellar environment. Thanks to modern time-domain optical surveys, which are discovering supernovae in the early stage of their evolution, we have the unique opportunity to capture their intraday behavior before maximum. We present high-cadence photometric monitoring (on the order of seconds-minutes) of the optical light curves of three Type Ia and two Type II SNe over several nights before and near maximum light, using the fast imagers available on the 2.3 m Aristarchos telescope at Helmos Observatory and the 1.2 m telescope at Kryoneri Observatory in Greece. We applied differential aperture photometry techniques using optimal apertures and we present reconstructed light curves after implementing a seeing correction and the Trend Filtering Algorithm (TFA, Kovács et al. 2005). TFA yielded the best results, achieving a typical precision between 0.01 − 0.04 mag. We did not detect significant bumps with amplitudes greater than 0.05 mag in any of the SNe targets in the VR-, R-, and I-bands light curves obtained. We measured the intraday slope for each light curve, which ranges between-0.37−0.36 mag day −1 in broadband VR,-0.19−0.31 mag day −1 in R band, and-0.13−0.10 mag day −1 in I band. We used SNe light curve fitting templates for SN 2018gv, SN 2018hgc and SN 2018hhn to photometrically classify the light curves and to calculate the time of maximum. We provide values for the maximum of SN 2018zd after applying a low-order polynomial fit and SN 2018hhn for the first time. We conclude that optimal aperture photometry in combination with TFA provides the highest-precision light curves for SNe that are relatively well separated from the centers of their host galaxies. This work aims to inspire the use of ground-based, high-cadence and high-precision photometry to study SNe with the purpose of revealing clues and properties of the explosion environment of both core-collapse and Type Ia supernovae, the explosion mechanisms, binary star interaction and progenitor channels. We suggest monitoring early supernovae light curves in hotter (bluer) bands with a cadence of hours as a promising way of investigating the post-explosion photometric behavior of the progenitor stars.

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SN 2018hna: 1987A-like Supernova with a Signature of Shock Breakout

Cited by 14 publications

References 51 publications

Infrared spectropolarimetric detection of intrinsic polarization from a core-collapse supernova

Infrared spectropolarimetric detection of intrinsic polarization from a core-collapse supernova

India’s First Robotic Eye for Time-domain Astrophysics: The GROWTH-India Telescope

First systematic high-precision survey of bright supernovae

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