Publication

First-author papers

(17): “Giant outbursts of clumpy material preceding Type II supernova 2024qiw”
Nagao, T., Kuncarayakti, H., Maeda, K., Mattila, S., Kotak, R., Killestein, T., Humina, C., Steeghs, D., Jarvis, D.
Astronomy & Astrophysics, accepted, 2026, ADS, arXiv:2512.07049

(16): “Analytical modeling of polarization signals arising from confined circumstellar material in Type II supernovae”
Nagao, T., Maeda, K., Matsumoto, T.
Astronomy & Astrophysics, 707, A103, 2026, ADS, arXiv:2509.19874

(15): “Observational diversity of bright long-lived Type II supernovae”
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., Muller-Bravo, T. E., Ragosta, F., Reguitti, A., Moran, S., González-Bañuelos, M., Kopsacheili, M., Petrushevska, T.
Astronomy & Astrophysics, 699, A283, 2025, ADS, arXiv:2504.01427

(14): “The aspherical explosions of the 03fg-like Type Ia supernovae 2021zny and 2022ilv revealed by polarimetry”
Nagao, T., Maeda, K. , Mattila, S., Kuncarayakti, H., Gutierrez, C. P., A., Cikota
Astronomy & Astrophysics Letters, 687, L19, 2024c, ADS, arXiv:2406.18110

(13): “Evidence for bipolar explosions in Type IIP supernovae”
Nagao, T., Maeda, K. , Mattila, S., Kuncarayakti, H., Kawabata, M., Taguchi, K., Nakaoka, T., Cikota, A., Bulla, M., Vasylyev, S., Gutierrez, C. P., Yamanaka, M., Isogai, K., Uno, K., Ogawa, M., Inutsuka, S., Tsurumi, M., Imazawa, R., Kawabata, K.S.
Astronomy & Astrophysics Letters, 687, L17, 2024b, ADS, arXiv:2406.14057

(12): “Spectropolarimetry of Type II supernovae. II. Intrinsic supernova polarization and its relations with the photometric/spectroscopic properties”
Nagao, T., Patat, F., Cikota, A., Baade, D., Mattila, S., Kotak, R., Kuncarayakti, H., Bulla, M., Ayala, B.
Astronomy & Astrophysics, 681, A11, 2024a, ADS, arXiv:2308.00996

(11): “Spectropolarimetry of Type II supernovae. I. Sample, observational data, and interstellar polarization”
Nagao, T., Mattila, S., Kotak, R., Kuncarayakti, H.
Astronomy & Astrophysics, 678, A43, 2023b, ADS, arXiv:2307.11455

(10): “Photometry and spectroscopy of the Type Icn supernova 2021ckj: The diverse properties of the ejecta and circumstellar matter of Type Icn SNe”
Nagao, T., Kuncarayakti, H., Maeda, K., Moore, T., Pastorello, A., Mattila, S., Uno, K., Smartt, S. J., Sim, S. A., Ferrari, L., Tomasella, L., Anderson, J. P., Chen, T.-W., Galbany, L., Gao, H., Gromadzki, M., Gutierrez, C. P., Inserra, C., Kankare, E., Magnier, E. A., Muller-Bravo, T. E., Reguitti, A. and Young, D. R.
Astronomy & Astrophysics, 673, A27, 2023a, ADS, arXiv:2303.07721

(9): “Diversity of dust properties in external galaxies confirmed by polarization signals from Type II supernovae”
Nagao, T., Patat, F., Maeda, K., Baade, D., Mattila, S., Taubenberger, S., Kotak, R., Cikota, A., Kuncarayakti, H., Bulla, M. and Maund, J. R.
The Astrophysical Journal Letters, 941, L4, 2022, ADS, arXiv:2211.11421

(8): “Evidence for multiple origins of fast declining Type II supernovae from spectropolarimetry
of SN 2013ej and SN 2017ahn”,
Nagao, T., Patat, F., Taubenberger, S., Baade, D., Faran, T., Cikota, A., Sand, D. J., Bulla, M., Kuncarayakti, H., Maund, J. R., Tartaglia, L., Valenti, S., Reichart, D. E.,
Monthly Notices of the Royal Astronomical Society, 505, 3664, 2021, ADS, arXiv:2105.13315

(7): “Early light curves of Type II supernovae interacting with a circumstellar disk”,
Nagao, T., Maeda, K. and Ouchi, R.,
Monthly Notices of the Royal Astronomical Society, 497, 5395, 2020, ADS, arXiv:2008.02160

(6): “The aspherical explosion of the Type IIP SN 2017gmr”,
Nagao, T., Cikota, A., Patat, F., Taubenberger, S., Bulla, M., Faran, T., Sand, D. J., Valenti, S., Andrews, J. E., and Reichart, D. E.,
Monthly Notices of the Royal Astronomical Society Letters, 489, L69, 2019, ADS, arXiv:1907.10505

(5): “Multi-band polarization of Type IIP supernovae due to light echo from circumstellar dust”,
Nagao, T., Maeda, K., and Tanaka, M.,
The Astrophysical Journal, 861, 1, 2018b
, ADS, arXiv:1805.11865

(4): “Polarization as a probe of dusty environments around Type Ia supernovae: radiative transfer models for SN 2012dn”,
Nagao, T., Maeda, K., and Yamanaka, M.,
Monthly Notices of the Royal Astronomical Society, 476, 4806, 2018a, ADS, arXiv:1802.08954

(3): “Circumstellar Light Echo as a Possible Origin of the Polarization of Type IIP Supernovae”,
Nagao, T., Maeda, K., and Tanaka, M.,
The Astrophysical Journal, 847, 111, 2017b, ADS, arXiv:1709.02077

(2): “The origin of the near-infrared excess in SN Ia 2012dn: Circumstellar dust around the super-Chandrasekhar supernova candidate”,
Nagao, T., Maeda, K., and Yamanaka, M.,
The Astrophysical Journal, 835, 143, 2017a, ADS, arXiv:1612.06632

(1): “Extinction Laws toward Stellar Sources within Dusty Circimstellar Medium and Implications for Type Ia Supernovae”,
Nagao, T., Maeda, K., and Nozawa, T.,
The Astrophysical Journal, 823, 104-114, 2016, ADS, arXiv:1603.07848

Co-author papers

(28) “SN 2024cld: unveiling the complex mass-loss histories of evolved supergiant progenitors to core collapse supernovae”
Killestein, T. L., Pursiainen, M., Kotak, R., Charalampopoulos, P., Lyman, J., Ackley, K., Belkin, S., Coppejans, D. L., Davies, B., Dyer, M. J., Galbany, L., Godson, B., Jarvis, D., Koivisto, N., Kumar, A., Magee, M., Mitchell, M., O’Neill, D., Sahu, A., Warwick, B., Breton, R. P., Butterley, T., Cai, Y.-Z., Casares, J., Dhillon, V. S., Elias-Rosa, N., Fraser, M., Galloway, D. K., Gompertz, B., González-Bañuelos, M., Gutiérrez, C. P., Kangas, T., Kankare, E., Kelsey, L., Kravtsov, T., Leloudas, G., Littlefair, S. P., Matilainen, K., Mattila, S., Nagao, T., Noysena, K., Nuttall, L. K., O’Brien, P., Pollacco, D., Ramsay, G., Reguitti, A., Reynolds, T. M., Salmaso, I., Starling, R. L. C., Steeghs, D., Stritzinger, M., Ulaczyk, K., Valerin, G., Wang, Z.-Y., Wilson, R.
Monthly Notices of the Royal Astronomical Society,  accepted, 2025, ADS

(27) “Massive stars exploding in a He-rich circumstellar medium: XII. SN 2024acyl: A fast, linearly declining Type Ibn supernova with early flash-ionisation features”
Cai, Y.-Z., Pastorello, A., Maeda, K., Zhao, J.-W., Wang, Z.-Y., Peng, Z.-H., Reguitti, A., Tartaglia, L., Filippenko, A. V., Pan, Y., Valerin, G., Kumar, B., Wang, Z., Fraser, M., Anderson, J. P., Benetti, S., Bose, S., Brink, T. G., Cappellaro, E., Chen, T.-W., Chen, X.-L., Elias-Rosa, N., Esamdin, A., Gal-Yam, A., González-Bañuelos, M., Gromadzki, M., Gutiérrez, C. P., Inserra, C., Iskandar, A., Kangas, T., Kankare, E., Kravtsov, T., Kuncarayakti, H., Li, L.-P., Liu, C.-X., Liu, X.-K., Lundqvist, P., Matilainen, K., Mattila, S., Moran, S., Müller-Bravo, T. E., Nagao, T., Petrushevska, T., Pignata, G., Salmaso, I., Smartt, S. J., Sollerman, J., Srivastav, S., Stritzinger, M. D., Wang, L.-T., Yan, S.-Y., Yang, Y., Yang, Y.-P., Zheng, W., Zou, X.-Z., Chen, L.-Y., Du, X.-L., Fang, Q.-L., Fiore, A., Ragosta, F., Zha, S., Zhang, J.-J., Liu, X.-W., Bai, J.-M., Wang, B., Wang, X.-F.
Astronomy & Astrophysics, 707, A157, 2026, ADS

(26) “Peculiar SN Ic 2022esa: An explosion of a massive Wolf-Rayet star in a binary as a precursor to a BH-BH binary?”
Maeda, K., Kuncarayakti, H., Nagao, T., Kawabata, M., Taguchi, K., Uno, K., De, K.
Publications of the Astronomical Society of Japan Letter, 78, L1, 2026, ADS

(25) “Formation of circumstellar material during double-white-dwarf mergers and the early excess emissions in Type Ia supernovae”
Inoue, Y., Maeda, K., Nagao, T., Matsumoto, T.
The Astrophysical Journal, 997, 312, 2026, ADS

(24) “The hydrogen-free circumstellar interaction in the Type Ib supernova 2021efd: A clue to the mechanism of the helium-layer stripping”
N. Pyykkinen, T. Nagao, H. Kuncarayakti, M. D. Stritzinger, T. Kangas, K. Maeda, P., Chen, J. Sollerman, C. Burns, S. Bose, G. Folatelli, L. Ferrari, N. Morrell, A., Reguitti, I. Salmaso, S. Mattila, A. Gal-Yam, C. Fremling, S. Anand, M. M. Kasliwal, C. P., Gutiérrez, L. Galbany, W. Hoogendam, S. Schulze, C. Ashall, K. Medler, C. M., Pfeffer, P. Lundqvist, B. Rusholme, and J. Adler
Astronomy & Astrophysics, 706, A183, 2026, ADS

(23) “SN 2023gpw: exploring the diversity and power sources of hydrogen-rich superluminous supernovae”
Kangas, T., Charalampopoulos, P., Nagao, T., Yan, L., Stritzinger, M., Schulze, S., Das, K., Elias-Rosa, N., Fremling, C., Perley, D., Sollerman, J., Müller-Bravo, T., Galbany, L., Groom, S. L., Gutiérrez, C., Kasliwal, M., Kotak, R., Laher, R., Lundqvist, P., Mattila, S., Smith, R.
Astronomy & Astrophysics, 705, A52, 2026, ADS

(22) “The ambiguous AT2022rze: Changing-look AGN mimicking a supernova in a merging galaxy system”
Pessi, P. J., Lunnan, R., Sollerman, J., Yan, L., Le Reste, A., Yao, Y., Nordblom, S., Sharma, Y., Gilfanov, M., Sunyaev, R., Schulze, S., Johansson, J., Gangopadhyay, A., Tristram, K., Hayes, M., Fransson, C., Hu, Y., Brennan, S. J., Rose, S., De, K., Charalampopoulos, P., Gkini, A., Graham, M. J., Gutiérrez, C. P., Mattila, S., Nagao, T., Pérez-Fournon, I., Poidevin, F., Bloom, J. S., Brugger, J., Chen, T. X., Kasliwal, M. M., Masci, F. J., Purdum, J. N.
MNRAS, 542, 3354, 2025, ADS

(21) “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”
Reynolds, T. M., Nagao, T., Maeda, K., Elias-Rosa, N., Fraser, M., Gutiérrez, C., Kangas, T., Kuncarayakti, H., Mattila, S., Pessi, P. J.
Astronomy & Astrophysics,  702, A213, 2025, ADS

(20) “The bright long-lived Type II SN 2021irp powered by aspherical circumstellar material interaction (I): Revealing the energy source with photometry and spectroscopy”
Reynolds, T. M., Nagao, T., Gottumukkala, R., Gutiérrez, C. P., Kangas, T., Kravtsov, T., Kuncarayakti, H., Maeda, K., Elias-Rosa, N., Fraser, M., Kotak, R., Mattila, S., Pastorello, A., Pessi, P. J., Cai, Y. -Z., Fynbo, J. P. U., Kawabata, M., Lundqvist, P., Matilainen, K., Moran, S., Reguitti, A., Taguchi, K., Yamanaka, M.
Astronomy & Astrophysics, 702, A212, 2025, ADS

(19) “Spectropolarimetry of a Nuclear Transient AT2023clx: Revealing the Geometrical Alignment between the Transient Outflow and the Nuclear Dusty Region”
Uno, K., Maeda, K., Nagao, T., Leloudas, G., Charalampopoulos, P., Mattila, S., Aoki, K., Taguchi, K., Kawabata, M., Moldon, J., Pérez-Torres, M., Pursiainen, M., Reynolds, T.
The Astrophysical Journal Letters,  986, L23, 2025, ADS

(18): “Optical evolution of AT 2024wpp: the high-velocity outflows in Cow-like transients are consistent with high spherical symmetry”
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.
Monthly Notices of the Royal Astronomical Society,  537, 3298, 2025, ADS

(17): “The enigmatic double-peaked stripped-envelope SN 2023aew”
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., Singh Teja, R., Valerin, G., Pastorello, A., Benetti, S., Cai, Y., Charalampopoulos, P., Gutiérrez, C. P., Kravtsov, T., Reguitti, A.
Astronomy & Astrophysics, 689, A182, 2024, ADS

(16): “The metamorphosis of the Type Ib SN 2019yvr: late-time interaction”
Ferrari, L., Folatelli, G., Kuncarayakti, H., Stritzinger, M., Maeda, K., Bersten, M., Román Aguilar, L. M., Sáez, M. M., Dessart, L., Lundqvist, P., Mazzali, P., Nagao, T., Ashall, C., Bose, S., Brennan, S. J., Cai, Y., Handberg, R., Holmbo, S., Karamehmetoglu, E., Pastorello, A., Reguitti, A., Anderson, J., Chen, T.-W., Galbany, L., Gromadzki, M., Gutiérrez, C. P., Inserra, C., Kankare, E., Müller Bravo, T. E., Mattila, S., Nicholl, M., Pignata, G., Sollerman, J., Srivastav, S., Young, D. R.
MNRAS, 529, L33, 2024, ADS

(15): “Intermediate-luminosity Type IIP SN 2021gmj: a low-energy explosion with signatures of circumstellar material”
Murai, Y., Tanaka, M., Kawabata, M., Taguchi, K., Teja, R. S., Nakaoka, T., Maeda, K., Kawabata, K. S., Nagao, T., Moriya, T. J., Sahu, D. K., Anupama, G. C., Tominaga, N., Morokuma, T., Imazawa, R., Inutsuka, S., Isogai, K., Kasuga, T., Kobayashi, N., Kondo, S., Maehara, H., Mori, Y., Niino, Y., Ogawa, M., Ohsawa, Ryou search by orcid ; Okumura, Shin-ichiro search by orcid ; Saito, Sei ; Sako, S., Takahashi, H., Uno, K., Yamanaka, M.,
MNRAS, 528, 4209, 2024, ADS

(14): “An aspherical distribution for the explosive burning ash of core-collapse supernovae”
Fang, Q., Maeda, K., Kuncarayakti, H., Nagao, T.
Nature Astronomy, 8, 111, 2024, ADS

(13): “SN 2020uem: A Possible Thermonuclear Explosion within A Dense Circumstellar Medium (II) The Properties of The CSM from Polarimetry and Light Curve Modeling”
Uno, K., Nagao, T., Maeda, K., Kuncarayakti, H., Tanaka, M., Kawabata, S. K., Nakaoka, T., Kawabata, M., Yamanaka, M., Aoki, K., Isogai, K., Ogawa, M., Tajitsu, A., Imazawa, R.
The Astrophysical Journal, 944, 204, 2023, ADS

(12): “SN 2020uem: A Possible Thermonuclear Explosion within A Dense Circumstellar Medium (I) The Nature of Type IIn/Ia-CSM SNe from Photometry and Spectroscopy”
Uno, K., Maeda, K., Nagao, T., Nakaoka, T., Motohara, K., Tajitsu, A., Konishi, M., Koyama, S., Takahashi, H., Tanaka, M., Kuncarayakti, H., Kawabata, M., Yamanaka, M., Aoki, K., Isogai, K., Taguchi, K., Ogawa, M., Kawabata, S. K., Yoshii, Y., Miyata, T., Imazawa, R.
The Astrophysical Journal, 944, 203, 2023, ADS

(11): “Late-time H/He-poor Circumstellar Interaction in the Type Ic Supernova SN 2021ocs: An Exposed Oxygen-Magnesium Layer and Extreme Stripping of the Progenitor”
Kuncarayakti, H., Maeda, K., Dessart, L., Nagao, T., Fulton, M., Gutierrez, C. P., Huber, M. E., Young, D. R., Kotak, R., Mattila, S., Anderson, J. P., Ferrari, L., Folatelli, G., Gao, H., Magnier, E., Smith, K. W., Srivastav, S
The Astrophysical Journal Letters, 941, L32, 2022, ADS

(10): “Calcium-rich Transient SN 2019ehk in a Star-forming Environment: Yet Another Candidate for a Precursor of a Double Neutron-star Binary”,
Nakaoka, T., Maeda, K., Yamanaka, M., Tanaka, M., Kawabata, M., Moriya, T. J., Kawabata, K. S., Tominaga, N., Takagi, K., Imazato, F., Morokuma, T., Sako, S., Ohsawa, R., Nagao, T., Jiang, J., Burgaz, U., Taguchi, K., Uemura, M., Akitaya, H., Sasada, M., Isogai, K., Otsuka, M., Maehara, H.,
The Astrophysical Journal, 912, 30, 2021, ADS

(9): “SN 2019ein: New Insights into the Similarities and Diversity among High-velocity Type Ia Supernovae”,
Kawabata, M., Maeda, K., Yamanaka, M., Nakaoka, T., Kawabata, K. S., Adachi, R., Akitaya, H., Burgaz, U., Hanayama, H., Horiuchi, T., Hosokawa, R., Iida, K., Imazato, F., Isogai, K., Jiang, J., Katoh, N., Kimura, H., Kino, M., Kuroda, D., Maehara, H., Matsubayashi, K., Morihana, K., Murata, K. L., Nagao, T., Niwano, M., Nogami, D., Oeda, M., Ono, T., Onozato, H., Otsuka, M., Saito, T., Sasada, M., Shiraishi, K., Sugiyama, H., Taguchi, K., Takahashi, J., Takagi, K., Takagi, S., Takayama, M., Tozuka, M., Sekiguchi, K.,
The Astrophysical Journal, 893, 143, 2020, ADS

(8): “SN 2018hna: 1987A-like Supernova with a Signature of Shock Breakout”,
Singh, A., Sahu, D. K., Anupama, G. C., Kumar, B., Kumar, H., Yamanaka, M., Baklanov, P, V., Tominaga, N., Blinnikov, S. I., Maeda, K., Dutta, A., Bhalerao, V., Anche, R. M., Barway, S., Akitaya, H., Nakaoka, T., Kawabata, M., Kawabata, K. S., Sasada, M., Takagi, K., Maehara, H., Isogai, K., Kino, M., Taguchi, K., and Nagao, T.,
The Astrophysical Journal, 882, L15, 2019, ADS

(7): “OISTER Optical and Near-Infrared Observations of the Super-Chandrasekhar Supernova Candidate SN 2012dn: Dust Emission from the Circumstellar Shell”,
Yamanaka, M., Maeda, K., Tanaka, M., Tominaga, N., Kawabata, K., Takaki, K., Kawabata, M., Nakaoka, T., Ueno, I., Akitaya, H., Nagayama, T., Takahashi, J., Honda, S., Omodaka, T., Miyanoshita, R., Nagao, T., Watanabe, M., Isogai, M., Arai, A., Itoh, R., Ui, T., Uemura, M., Yoshida, M., Hanayama, H., Kuroda, D., Ukita, N., Yanagisawa, K., Izumiura, H., Saito, Y., Masumoto, K., Ono, R., Noguchi, R., Matsumoto, K., Nogami, D., Morokuma, T., Oasa,Y., and Sekiguchi, K.,
Pabl. Astron. Soc. Japan, 68, 68, 2016, ADS

(6): “Constraining the amount of circumstellar matter and dust around Type Ia supernovae through near-infrared echoes”,
Maeda, K., Nozawa, T., Nagao, T., and Motohara, K.,
Monthly Notices of the Royal Astronomical Society, 452, 3281-3292, 2015, ADS

(5): “Superflares on Solar Type Stars Observed with Kepler I. Statistical Properties of Superflares”,
Shibayama,T., Maehara, H., Notsu, S., Notsu, Y., Nagao, T., Honda, S., Ishii, T. T., Nogami, D., and Shibata, K.,
The Astrophysical Journal Supplement, 209, 5, 2013, ADS

(4): “High-Dispersion Spectroscopy of the Superflare Star KIC6934317”,
Notsu, S., Honda, S., Notsu, Y., Nagao, T., Shibayama,T., Maehara, H., Nogami, D., and Shibata, K.,
Pabl. Astron. Soc. Japan, 65, 112, 2013, ADS

(3): “Superflares on Solar-Type Stars Observed with Kepler II. Photometric Variability of Superflare-Generating Stars : A Signature of Stellar Rotation and Starspots”,
Notsu, Y., Shibayama,T., Maehara, H., Notsu, S., Nagao, T., Honda, S., Ishii, T. T., Nogami, D., and Shibata, K.,
The Astrophysical Journal, 771 127, 2013, ADS

(2): “Can Superflares Occur on Our Sun?”,
Shibata, K., Isobe, H., Hillier, A., Choudhuri, A. R., Maehara, H., Ishii, T. T., Shibayama, T., Notsu, S., Notsu, Y., Nagao, T., Honda, S., and Nogami, D.,
Pabl. Astron. Soc. Japan, 65, 49, 2013, ADS

(1): “Superflares on solar-type stars”,
Maehara, H., Shibayama, T., Notsu, S., Notsu, Y., Nagao, T., Kusaba, S., Honda, S., Nogami, D., and Shibata, K.,
Nature, 485, 7399, 478-481, 2012, ADS