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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  • 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)


  • 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, Teja Rishabh Singh, 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)


  • ePESSTO+ spectroscopic classification of optical transients #2023-293  (2023)  Transient Name Server: AstroNote Moore T, Ramsden P, Aamer A, Smith K, Fulton M, Benetti S, Srivastav S, Galbany L, Killestein T, Nagao T, Sollerman J, 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)


  • ePESSTO+ spectroscopic classification of optical transients #2023-298  (2023)  Transient Name Server: AstroNote Moore T, Aamer A, Ramsden P, Angus C, Srivastav S, Fulton M, Smith K, Nagao T, Pessi P, Ihanec N, Anderson J, Chen T, Gromadzki M, Inserra C, Kankare E, Bravo T, Nicholl M, Yaron O, Young D, 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)


  • ePESSTO+ spectroscopic classification of optical transients #2023-300  (2023)  Transient Name Server: AstroNote Ramsden P, Aamer A, Moore T, Srivastav S, Angus C, Fulton M, Smith K, Pessi P, Ihanec N, Nagao T, Anderson J, Chen T, Gromadzki M, Inserra C, Kankare E, Bravo T, Nicholl M, Yaron O, Young D, 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)


  • ePESSTO+ spectroscopic classification of optical transients #2023-304  (2023)  Transient Name Server: AstroNote Aamer A, Moore T, Ramsden P, Angus C, Srivastav S, Smith K, Fulton M, Ihanec N, Nagao T, Pessi P, Anderson J, Chen T, Gromadzki M, Inserra C, Kankare E, Bravo T, Nicholl M, Yaron O, Young D, 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)


  • Photometry and spectroscopy of the Type Icn supernova 2021ckj. The diverse properties of the ejecta and circumstellar matter of Type Icn supernovae  (2023)  
    • Astronomy and Astrophysics
     Nagao T, Kuncarayakti H, Maeda K, Moore T, Pastorello A, Mattila S, Uno K, Smartt SJ, Sim SA, Ferrari L, Tomasella L, Anderson JP, Chen TW, Galbany L, Gao H, Gromadzki M, Gutiérrez CP, Inserra C, Kankare E, Magnier EA, Muller-Bravo TE, Reguitti A, Young DR
    (    A1 Refereed original research article in a scientific journal)


  • SN 2020uem: a Possible Thermonuclear Explosion within a Dense Circumstellar Medium (II). The Properties of the CSM from Polarimetry and Light-curve Modeling  (2023)  
    • Astrophysical Journal
     Uno Kohki, Nagao Takashi, Maeda Keiichi, Kuncarayakti Hanindyo, Tanaka Masaomi, Kawabata Koji S., Nakaoka Tatsuya, Kawabata Miho, Yamanaka Masayuki, Aoki Kentaro, Isogai Keisuke, Ogawa Mao, Tajitsu Akito, Imazawa Ryo
    (    A1 Refereed original research article in a scientific journal)


  • SN 2020uem: a Possible Thermonuclear Explosion within a Dense Circumstellar Medium. I. The Nature of Type IIn/Ia-CSM SNe from Photometry and Spectroscopy  (2023)  
    • Astrophysical Journal
     Uno Kohki, Maeda Keiichi, Nagao Takashi, Nakaoka, Tatsuya, Motohara Kentaro, Tajitsu Akito, Konishi Masahiro, Koyama Shuhei, Takahashi, Hidenori, Tanaka, Masaomi, Kuncarayakti, Hanindyo, Kawabata Miho, Yamanaka Masayuki, Aoki Kentaro, Isogai, Keisuke, Taguchi Kenta, Ogawa Mao, Kawabata, Koji S., Yoshii, Yuzuru, Miyata Takashi, Imazawa Ryo
    (    A1 Refereed original research article in a scientific journal)


  • Spectropolarimetry of Type II supernovae: I. Sample, observational data, and interstellar polarization  (2023)  
    • Astronomy and Astrophysics
     Nagao Takashi, Mattila Seppo, Kotak Rubina, Kuncarayakti Hanindyo
    (    A1 Refereed original research article in a scientific journal)



Last updated on 2023-12-07 at 12:35