Takashi Nagao
 PhD


takashi.nagao@utu.fi




ORCID identifier: https://orcid.org/0000-0002-3933-7861

Personal web page

My journal papers (ADS)

Biography

I am a postdoctoral researcher at University of Turku in Finland. I have obtained my PhD degree at Kyoto University in Japan on March 2019. After this, I moved to European Southern Observatory as a JSPS Overseas Research Fellow, and spent time there until November 2020. Then, I came to University of Turku.



Research

I am working on supernovae using physics of radiation and fluid as well as using spectroscopic and polarimetric observations. "How do massive stars die?", answering this question is one of my research goals.



Publications
  
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  • Formation of Circumstellar Material during Double-white-dwarf Mergers and the Early Excess Emissions in Type Ia Supernovae  (2026)  
    • Astrophysical Journal
     Inoue, Yusuke; Maeda, Keiichi; Nagao, Takashi; Matsumoto, Tatsuya
    (    A1 Refereed original research article in a scientific journal)


  • Peculiar SN Ic 2022esa: An explosion of a massive Wolf–Rayet star in a binary as a precursor to a BH–BH binary?  (2026)  
    • Publications- Astronomical Society of Japan
     Maeda, Keiichi; Kuncarayakti, Hanindyo; Nagao, Takashi; Kawabata, Miho; Taguchi, Kenta; Uno, Kohki; De, Kishalay
    (    A1 Refereed original research article in a scientific journal)


  • SN 2023gpw: Exploring the diversity and power sources of hydrogen-rich superluminous supernovae  (2026)  
    • Astronomy and Astrophysics
     Kangas, T.; Charalampopoulos, P.; Nagao, T.; Yan, L.; Stritzinger, M.; Schulze, S.; Das, K.; Elias-Rosa, N.; Fremling, C.; Perley, D.; Sollerman, J.; Muller-Bravo, T. E.; Galbany, L.; Groom, S. L.; Gutierrez, C. P.; Kasliwal, M. M.; Kotak, R.; Laher, R. R.; Lundqvist, P.; Mattila, S.; Smith, R.
    (    A1 Refereed original research article in a scientific journal)


  • The hydrogen-free circumstellar interaction in the Type Ib supernova 2021efd: A clue to the mechanism of the helium-layer stripping  (2026)  
    • Astronomy and Astrophysics
     Pyykkinen, N.; Nagao, T.; Kuncarayakti, H.; Stritzinger, M. D.; Kangas, T.; Maeda, K.; Chen, P.; Sollerman, J.; Burns, C.; Bose, S.; Folatelli, G.; Ferrari, L.; Morrell, N.; Reguitti, A.; Salmaso, I.; Mattila, S.; Gal-Yam, A.; Fremling, C.; Anand, S.; Kasliwal, M. M.; Gutierrez, C. P.; Galbany, L.; Hoogendam, W.; Schulze, S.; Ashall, C.; Medler, K.; Pfeffer, C. M.; Lundqvist, P.; Rusholme, B.; Adler, J.
    (    A1 Refereed original research article in a scientific journal)


  • NUTS Transient Classification Report for 2025-03-18 #1035  (2025)  Transient name server Classification report Stritzinger, M.; Nagao, T.; Ashall, C.; Burns, C. R.; Hoogendam, W.; Huangfei, X.; Hsiao, Y. E.; Kumar, S.; Medler, K.; Morrell, N.; Pfeffer, C.; Polin, A.
    (    D2 Article in a professional compilation book)


  • Observational diversity of bright long-lived Type II supernovae  (2025)  
    • Astronomy and Astrophysics
     Nagao, T.; Reynolds, T. M.; Kuncarayakti, H.; Cartier, R.; Mattila, S.; Maeda, K.; Sollerman, J.; Pessi, P. J.; Anderson, J. P.; Inserra, C.; Chen, T. -w.; Ferrari, L.; Fraser, M.; Young, D. R.; Gromadzki, M.; Gutiérrez, C. P.; Lundqvist, P.; Pignata, G.; Müller-Bravo, T. E.; Ragosta, F.; Reguitti, A.; Moran, S.; González-Bañuelos, M.; Kopsacheili, M.; Petrushevska, T.
    (    A1 Refereed original research article in a scientific journal)


  • Optical evolution of AT 2024wpp: the high-velocity outflows in Cow-like transients are consistent with high spherical symmetry  (2025)  
    • Monthly Notices of the Royal Astronomical Society
     Pursiainen, M.; Killestein, T. L.; Kuncarayakti, H.; Charalampopoulos, P.; Warwick, B.; Lyman, J.; Kotak, R.; Leloudas, G.; Coppejans, D.; Kravtsov, T.; Maeda, K.; Nagao, T.; Taguchi, K.; Ackley, K.; Dhillon, V. S.; Galloway, D. K.; Kumar, A.; O'Neill, D.; Ramsay, G.; Steeghs, D.
    (    A1 Refereed original research article in a scientific journal)


  • Spectropolarimetry of a Nuclear Transient AT2023clx: Revealing the Geometrical Alignment between the Transient Outflow and the Nuclear Dusty Region  (2025)  
    • Astrophysical Journal Letters
     Uno, Kohki; Maeda, Keiichi; Nagao, Takashi; Leloudas, Giorgos; Charalampopoulos, Panos; Mattila, Seppo; Aoki, Kentaro; Taguchi, Kenta; Kawabata, Miho; Moldon, Javier; Perez-Torres, Miguel; Pursiainen, Miika; Reynolds, Thomas
    (    A1 Refereed original research article in a scientific journal)


  • The ambiguous AT2022rze: changing-look AGN mimicking a supernova in a merging galaxy system  (2025)  
    • Monthly Notices of the Royal Astronomical Society
     Pessi, Priscila; Lunnan, R.; Sollerman, Jesper; Yan, L.; Le Reste, A.; Yao, Y.; Nordblom, S.; Sharma, Y.; Gilfanov, M.; Sunyaev, R.; Schulze, S.; Johansson, J.; Gangopadhyay, A.; Fremling, C.; Tristram, K.; Hayes, Matthew; Fransson, C.; Hu, Yan; Brennan, S. J.; Rose, S.; De, K.; Hinds, K-Ryan; Liu, Chang; Miller, Adam; Qin, Yu-Jing; Charalampopoulos, P.; Gkini, A.; Graham, Matthew; Gutiérrez, Claudia; Mattila, Seppo; Nagao, Takashi; Perez-Fournon, I; Poidevin, F.; Bloom, J. S.; Brugger, J.; Chen, T. X.; Kasliwal, Mansi ; Masci, F. J.; Purdum, J. N.
    (    A1 Refereed original research article in a scientific journal)


  • The bright long-lived Type II SN 2021irp powered by aspherical circumstellar material interaction: II. Estimating the CSM mass and geometry with polarimetry and light curve modeling  (2025)  
    • Astronomy and Astrophysics
     Reynolds, Thomas M.; Nagao, Takashi; Maeda, Keiichi; Elias-Rosa, Nancy; Fraser, Morgan; Gutierrez, Claudia; Kangas, Tuomas; Kuncarayakti, Hanindyo; Mattila, Seppo; Pessi, Priscila J.
    (    A1 Refereed original research article in a scientific journal)


  • The bright long-lived Type II SN 2021irp powered by aspherical circumstellar material interaction I. Revealing the energy source with photometry and spectroscopy  (2025)  
    • Astronomy and Astrophysics
     Reynolds, Thomas M.; Nagao, Takashi; Gottumukkala, Rashmi; Gutierrez, Claudia P.; Kangas, Tuomas; Kravtsov, Timo; Kuncarayakti, Hanindyo; Maeda, Keiichi; Elias-Rosa, Nancy; Fraser, Morgan; Kotak, Rubina; Mattila, Seppo; Pastorello, Andrea; Pessi, Priscila J.; Cai, Yongzhi; Fynbo, Johan Peter Uldall; Kawabata, Miho; Lundqvist, Peter; Matilainen, Katja; Moran, Shane; Reguitti, Andrea; Taguchi, Kenta; Yamanaka, Masamichi
    (    A1 Refereed original research article in a scientific journal)


  • Evidence for bipolar explosions in Type IIP supernovae  (2024)  
    • Astronomy and Astrophysics
     Nagao, T.; Maeda, K.; Mattila, S.; Kuncarayakti, H.; Kawabata, M.; Taguchi, K.; Nakaoka, T.; Cikota, A.; Bulla, M.; Vasylyev, S. S.; Gutiérrez, C. P.; Yamanaka, M.; Isogai, K.; Uno, K.; Ogawa, M.; Inutsuka, S.; Tsurumi, M.; Imazawa, R.; Kawabata, K. S.
    (    A1 Refereed original research article in a scientific journal)


  • Intermediate-luminosity Type IIP SN 2021gmj : a low-energy explosion with signatures of circumstellar material  (2024)  
    • Monthly Notices of the Royal Astronomical Society
     Murai, Yuta; Tanaka, Masaomi; Kawabata, Miho; Taguchi, Kenta; Singh Teja, Rishabh; Nakaoka, Tatsuya; Maeda, Keiichi; Kawabata, Koji S.; Nagao, Takashi; Moriya, Takashi J.; Sahu, D. K.; Anupama, G. C.; Tominaga, Nozomu; Morokuma, Tomoki; Imazawa, Ryo; Inutsuka, Satoko; Isogai, Keisuke; Kasuga, Toshihiro; Kobayashi, Naoto; Kondo, Sohei; Maehara, Hiroyuki; Mori, Yuki; Niino, Yuu; Ogawa, Mao; Ohsawa, Ryou; Okumura, Shin-Ichiro; Saito, Sei; Sako, Shigeyuki; Takahashi, Hidenori; Uno, Kohki; Yamanaka, Masayuki
    (    A1 Refereed original research article in a scientific journal)


  • Spectropolarimetry of Type II supernovae: II. Intrinsic supernova polarization and its relation to photometric and spectroscopic properties  (2024)  
    • Astronomy and Astrophysics
     Nagao T., Patat F., Cikota A., Baade D., Mattila S., Kotak R., Kuncarayakti H., Bulla M., Ayala B.
    (    A1 Refereed original research article in a scientific journal)


  • The aspherical explosions of the 03fg-like Type Ia supernovae 2021zny and 2022ilv revealed by polarimetry  (2024)  
    • Astronomy and Astrophysics
     Nagao, T.; Maeda, K.; Mattila, S.; Kuncarayakti, H.; Gutierrez, C. P.; Cikota, A.
    (    A1 Refereed original research article in a scientific journal)


  • The enigmatic double-peaked stripped-envelope SN 2023aew  (2024)  
    • Astronomy and Astrophysics
     Kangas, T.; Kuncarayakti, H.; Nagao, T.; Kotak, R.; Kankare, E.; Fraser, M.; Stevance, H.; Mattila, S.; Maeda, K.; Stritzinger, M.; Lundqvist, P.; Elias-Rosa, N.; Ferrari, L.; Folatelli, G.; Frohmaier, C.; Galbany, L.; Kawabata, M.; Koutsiona, E.; Müller-Bravo, T. E.; Piscarreta, L.; Pursiainen, M.; Singh, A.; Taguchi, K.; Teja, R. S.; Valerin, G.; Pastorello A.; Benetti S.; Cai Y.-Z.; Charalampopoulos P.; Gutiérrez C. P.; Kravtsov T.; Reguitti A.
    (    A1 Refereed original research article in a scientific journal)


  • The metamorphosis of the Type Ib SN 2019yvr: late-time interaction  (2024)  
    • Monthly Notices of the Royal Astronomical Society: Letters
     Ferrari, Lucía; Folatelli, Gastón; Kuncarayakti, Hanindyo; Stritzinger, Maximilian; Maeda, Keiichi; Bersten, Melina; Román Aguilar, Lili M.; Sáez, M. Manuela; Dessart, Luc; Lundqvist, Peter; Mazzali, Paolo; Nagao, Takashi; Ashall, Chris; Bose, Subhash; Brennan, Seán J.; Cai, Yongzhi; Handberg, Rasmus; Holmbo, Simon; Karamehmetoglu, Emir; Pastorello, Andrea; Reguitti, Andrea; Anderson, Joseph; Chen, Ting-Wan; Galbany, Lluís, Gromadzki, Mariusz; Gutiérrez, Claudia P.; Inserra, Cosimo; Kankare, Erkki; Müller Bravo, Tomás E.; Mattila, Seppo; Nicholl, Matt; Pignata, Giuliano; Sollerman, Jesper; Srivastav, Shubham; Young, David R.
    (    A1 Refereed original research article in a scientific journal)


  • An aspherical distribution for the explosive burning ash of core-collapse supernovae  (2023)  
    • Nature Astronomy
     Fang Qiliang, Maeda Keiichi, Kuncarayakti Hanindyo, Nagao Takashi
    (    A1 Refereed original research article in a scientific journal)


  • ePESSTO+ spectroscopic classification of optical transients #2023-289  (2023)  Transient Name Server: AstroNote Aamer A, Moore T, Ramsden P, Smith K, Fulton M, Angus C, Srivastav S, Galbany L, Killestein T, Nagao T, Benetti S, Anderson J, Bravo T, Chen T, Gromadzki M, Inserra C, Kankare E, Nicholl M, Young D, Zimmerman E, Yaron O, Sim S, Weston J, Sheng X, Shingles L, Smartt S, Stevance H, Rhodes L, Andersson A, Gillanders J, Ramaiya S, Denneau L, Tonry J, Weiland H, Lawrence A, Siverd R, Erasmus N, Koorts W, Jordan A, Suc V, Rest A, Stubbs C, Chambers K, Huber M, Schultz A, Boer T, Bulger J, Fairlamb J, Gao H, Lin C, Lowe T, Magnier E, Minguez P, Smith I, Wainscoat R
    (    D2 Article in a professional compilation book)


  • ePESSTO+ spectroscopic classification of optical transients #2023-290  (2023)  Transient Name Server: AstroNote Ramsden P, Aamer A, Moore T, Fulton M, Smith K, Srivastav S, Galbany L, Killestein T, Nagao T, Benetti S, Anderson J, Bravo T, Chen T, Gromadzki M, Inserra C, Kankare E, Nicholl M, Young D, Zimmerman E, Yaron O, Sim S, Weston J, Sheng X, Shingles L, Smartt S, Stevance H, Rhodes L, Andersson A, Gillanders J, Ramaiya S, Denneau L, Tonry J, Weiland H, Lawrence A, Siverd R, Erasmus N, Koorts W, Jordan A, Suc V, Rest A, Stubbs C
    (    D2 Article in a professional compilation book)



Last updated on 01/10/2025 02:26:01 AM