SN 2021hpr

SN 2021hpr
	NGC 3147 is the host galaxy
Event type	Ia supernova
Date	2 April 2021
Constellation	Draco
Right ascension	10h 16m 38.620s
Declination	+73° 24′ 01.80″
Epoch	J2000
Distance	147 million ly
Host	NGC 3147
Progenitor	Binary star
Peak apparent magnitude	13.8
	[edit on Wikidata]

SN 2021hpr was a Type Ia supernova located in the Constellation of Draco that occurred in the spiral galaxy NGC 3147 at a distance of around 147 million light years (45 Mpc). Its discovery was reported by amateur astronomer Kōichi Itagaki on 2 April 2021. The progenitor of this supernova was likely a star in a binary star system with a separation of around 15.84 AU.

The expanding fireball produced by this supernova was homogeneous. This is likely due to the supernova ejecta interacting with its companion object and the surrounding circumstellar medium (CSM). The circumstellar medium was metal rich.

References

1 2 "SN 2021hpr". Transient Name Server. IAU. Retrieved 18 May 2025.
↑ Bishop, David. "Bright Supernovae - SN 2021hpr". Rochester Astronomy. Retrieved 18 May 2025.
↑ Lim, Gu; Im, Myungshin; Paek, Gregory S. H.; Yoon, Sung-Chul; Choi, Changsu; Kim, Sophia; Wheeler, J. Craig; Thomas, Benjamin P.; Vinkó, Jozsef; Kim, Dohyeong; Seo, Jinguk; Kang, Wonseok; Kim, Taewoo; Sung, Hyun-Il; Kim, Yonggi (May 2023). "The Early Light Curve of the Type Ia Supernova 2021hpr in NGC 3147: Progenitor Constraints with the Companion Interaction Model". The Astrophysical Journal. 949 (1): 33. arXiv:2303.05051. Bibcode:2023ApJ...949...33L. doi:10.3847/1538-4357/acc10c. ISSN 0004-637X.
↑ Itagaki, K. (April 2021). "Transient Discovery Report for 2021-04-02". Transient Name Server Discovery Report (2021–998). Retrieved 16 May 2025.
1 2 Iskandar, Abdusamatjan; Wang, Xiaofeng; Esamdin, Ali; Zeng, Xiangyun; Pellegrino, Craig; Yan, Shengyu; Liu, Jialian; Filippenko, Alexei V.; Howell, D. Andrew; McCully, Curtis; Brink, Thomas G.; Hu, Maokai; Yang, Yi; Zheng, WeiKang; Lü, Guoliang (2025-05-08). "SN 2021hpr: A Normal Type Ia Supernova Showing Excess Emission in the Early Rising Phase". The Astrophysical Journal. 984 (2): 160. arXiv:2503.02257. Bibcode:2025ApJ...984..160I. doi:10.3847/1538-4357/adb3a4. ISSN 0004-637X.
↑ Barna, B.; Nagy, A. P.; Bora, Zs.; Czavalinga, D. R.; Könyves-Tóth, R.; Szalai, T.; Székely, P.; Zsíros, Sz.; Bánhidi, D.; Bíró, I. B.; Csányi, I.; Kriskovics, L.; Pál, A.; Szabó, Zs. M.; Szakáts, R.; Vida, K.; Bodola, Zs.; Vinkó, J. (September 2023). "Three is the magic number: Distance measurement of NGC 3147 using SN 2021hpr and its siblings" (PDF). Astronomy & Astrophysics. 677: A183. arXiv:2307.01290. Bibcode:2023A&A...677A.183B. doi:10.1051/0004-6361/202346395. Retrieved 16 May 2025.
↑ Zhang, Yu; Zhang, Tianmeng; Danzengluobu; Li, Zhitong; Zhao, Pinsong; Zhang, Bingqing; Du, Lin; Zhu, Yinan; Wu, Hong (2022-07-01). "Optical Observations of the Nearby Type Ia Supernova 2021hpr". Publications of the Astronomical Society of the Pacific. 134 (1037): 074201. arXiv:2207.08395. Bibcode:2022PASP..134g4201Z. doi:10.1088/1538-3873/ac7583. ISSN 0004-6280.

[TNS-1] 1 2 "SN 2021hpr". Transient Name Server. IAU. Retrieved 18 May 2025.

[2] Bishop, David. "Bright Supernovae - SN 2021hpr". Rochester Astronomy. Retrieved 18 May 2025.

[3] Lim, Gu; Im, Myungshin; Paek, Gregory S. H.; Yoon, Sung-Chul; Choi, Changsu; Kim, Sophia; Wheeler, J. Craig; Thomas, Benjamin P.; Vinkó, Jozsef; Kim, Dohyeong; Seo, Jinguk; Kang, Wonseok; Kim, Taewoo; Sung, Hyun-Il; Kim, Yonggi (May 2023). "The Early Light Curve of the Type Ia Supernova 2021hpr in NGC 3147: Progenitor Constraints with the Companion Interaction Model". The Astrophysical Journal. 949 (1): 33. arXiv:2303.05051. Bibcode:2023ApJ...949...33L. doi:10.3847/1538-4357/acc10c. ISSN 0004-637X.

[Itagaki2021-4] Itagaki, K. (April 2021). "Transient Discovery Report for 2021-04-02". Transient Name Server Discovery Report (2021–998). Retrieved 16 May 2025.

[:0-5] 1 2 Iskandar, Abdusamatjan; Wang, Xiaofeng; Esamdin, Ali; Zeng, Xiangyun; Pellegrino, Craig; Yan, Shengyu; Liu, Jialian; Filippenko, Alexei V.; Howell, D. Andrew; McCully, Curtis; Brink, Thomas G.; Hu, Maokai; Yang, Yi; Zheng, WeiKang; Lü, Guoliang (2025-05-08). "SN 2021hpr: A Normal Type Ia Supernova Showing Excess Emission in the Early Rising Phase". The Astrophysical Journal. 984 (2): 160. arXiv:2503.02257. Bibcode:2025ApJ...984..160I. doi:10.3847/1538-4357/adb3a4. ISSN 0004-637X.

[Barna2021-6] Barna, B.; Nagy, A. P.; Bora, Zs.; Czavalinga, D. R.; Könyves-Tóth, R.; Szalai, T.; Székely, P.; Zsíros, Sz.; Bánhidi, D.; Bíró, I. B.; Csányi, I.; Kriskovics, L.; Pál, A.; Szabó, Zs. M.; Szakáts, R.; Vida, K.; Bodola, Zs.; Vinkó, J. (September 2023). "Three is the magic number: Distance measurement of NGC 3147 using SN 2021hpr and its siblings" (PDF). Astronomy & Astrophysics. 677: A183. arXiv:2307.01290. Bibcode:2023A&A...677A.183B. doi:10.1051/0004-6361/202346395. Retrieved 16 May 2025.

[7] Zhang, Yu; Zhang, Tianmeng; Danzengluobu; Li, Zhitong; Zhao, Pinsong; Zhang, Bingqing; Du, Lin; Zhu, Yinan; Wu, Hong (2022-07-01). "Optical Observations of the Nearby Type Ia Supernova 2021hpr". Publications of the Astronomical Society of the Pacific. 134 (1037): 074201. arXiv:2207.08395. Bibcode:2022PASP..134g4201Z. doi:10.1088/1538-3873/ac7583. ISSN 0004-6280.