From Nova to Type Ia Supernova -- toward sophisticated binary evolution

• Project/Area Number: 15K05026
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: Keio University
• Principal Investigator: KATO Mariko 慶應義塾大学, 理工学部(日吉), 教授 (50185873)
• Project Period (FY): 2015-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000); Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
• Keywords: 新星 / 連星系 / 超新星 / 白色矮星 / Ｘ線 / 新星爆発 / 回帰新星 / 連星系の進化

Outline of Final Research Achievements

The decay phase of nova outbursts can be followed by Kato's optically thick wind theory. Based on this method, we analyzed a number of nova light curves to determine binary parameters such as the white dwarf mass. We proposed stretched color-magnitude diagram and found common paths. Using this property we determined the distance and interstellar absorption of each nova. The recurrent nova M31N 2008-12a, a most promising candidate of Type Ia supernova, is observed in detail by our international observation team and I contributed from the theoretical side. We also calculated silicon and heavy element production during He shell flash on very massive white dwarfs that explains high velocity feature commonly observed in early phase of SN Ia explosion.

Academic Significance and Societal Importance of the Research Achievements

Ia型超新星は爆発時に鉄をまきちらし宇宙の元素組成の進化に大きく寄与する天体である。また宇宙の加速膨張を検出する決め手になった天体でもある。このように重要な天体であるが、そのIa型超新星の爆発直前の天体（親天体）はいまだに確定していない。本研究は新星と回帰新星の理論的・観測的研究をおこない、連星系中の白色矮星がどのように重くなり爆発に至るかの道筋を理論的に緻密においかけて、Ia型超新星についての理解を深めるものである。

Research Products

• [Int'l Joint Research] San Diego University/Embry-Riddle Aeronautical University/Pennsylvania State University(米国)
• [Int'l Joint Research] Liverpool John Moores University/Lancaster University(英国)
• [Int'l Joint Research] Indian Institute of Astrophysics(インド)
• [Int'l Joint Research] Xinjiang Astronomical Observatory(中国)
• [Int'l Joint Research] Academy of Science/Carles University/University of Opava(チェコ)
• [Int'l Joint Research]
• [Int'l Joint Research] ＣＳＩＣ/ＥＳＡＣ/ＩＡＣ(スペイン)
• [Int'l Joint Research] Ｌｉｖｅｒｐｏｏｌ Ｊ． Ｍ Ｕｎｉｖ/Ｕ． Ｌｅｉｃｅｓｔｅｒ/Ｌａｎｃａｓｔｅｒ Ｕ．(英国)
• [Int'l Joint Research] ＡＩＡＳ/Ｃｈｓｒｌｅｓ Ｕ．(チェコ)
• [Int'l Joint Research] ＩＭＡＰＰ(オランダ)
• [Int'l Joint Research] Ｕ．Ｉｌｌｉｎｏｉ/ＡＭＮＨ/ＬＣＯＧＴＮ(米国)
• [Int'l Joint Research]
• [Int'l Joint Research] Institut de Ciencies de l'espai/ESAC(スペイン)
• [Int'l Joint Research] リバプール大学(英国)
• [Int'l Joint Research] サンディアゴ州立大学(米国)
• [Journal Article] The UBV color evolution of classical novae III. Time-stretched color-magnitude diagram of novae in outburst (2019)
  • Author(s): Hachisu, I. and Kato, M.
  • Journal Title: Ａｓｔｒｏｐｈｙｓical Ｊｏｕｒｎａｌ, Suppliment Volume: 241 Issue: 1 Pages: 1-67
  • DOI: 10.3847/1538-4365/ab0202
  • Peer Reviewed
• [Journal Article] Breaking the habit - the peculiar 2016 eruption of the unique recurrent nova M31N 2008-12a (2018)
  • Author(s): Henze, M., Darnley, M.J., Williams, S.C., Kato,M., Hachisu, I., Amupama,G.C., Arai, A., Boyd, D, Burke,D., Cialdullo, R., Chineti, K., Cook,L.M., Erdman, P, Gao, X,Harris,B.,Hartmann,D.H., Hontoch, K.Chuck, J. et al.
  • Journal Title: Ａｓｔｒｏｐｈｙｓical Ｊｏｕｒｎａｌ Volume: 857 Pages: 1-42
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A Light-curve Analysis of Gamma-ray Nova V959 Mon -- Distance and White Dwarf Mass (2018)
  • Author(s): Hachisu, I. and Kato, M.
  • Journal Title: Ａｓｔｒｏｐｈｙｓical Ｊｏｕｒｎａｌ Volume: 858 Issue: 2 Pages: 1-16
  • DOI: 10.3847/1538-4357/aabee0
  • Peer Reviewed
• [Journal Article] A light curve analysis of recurrent and very fast novae in our Galaxy, Magellanic Clouds, and M31 (2018)
  • Author(s): Hachisu, I. and Kato, M.
  • Journal Title: Ａｓｔｒｏｐｈｙｓical Ｊｏｕｒｎａｌ, Suppliment Volume: 237 Issue: 1 Pages: 1-51
  • DOI: 10.3847/1538-4365/aac833
  • Peer Reviewed
• [Journal Article] Production of Silicon on Mass Increasing White Dwarf -- Possible Origin of High-Velocity-Features in Type Ia Supernova (2018)
  • Author(s): Kato, M., Saio, H., and Hachisu, I.
  • Journal Title: Ａｓｔｒｏｐｈｙｓical Ｊｏｕｒｎａｌ Volume: 863 Issue: 2 Pages: 1-19
  • DOI: 10.3847/1538-4357/aad327
  • Peer Reviewed
• [Journal Article] A Millennium-long Evolution of the 1 yr Recurrence Period Nova - Search for Any Indication of the Forthcoming He Flash (2017)
  • Author(s): Kato Mariko、Saio Hideyuki、Hachisu Izumi
  • Journal Title: The Astrophysical Journal Volume: 844 Issue: 2 Pages: 143-143
  • DOI: 10.3847/1538-4357/aa7c5e
  • Peer Reviewed / Open Access
• [Journal Article] A Self-consistent Model for a Full Cycle of Recurrent Novae - Wind Mass-loss Rate and X-Ray Luminosity (2017)
  • Author(s): Kato Mariko、Saio Hideyuki、Hachisu Izumi
  • Journal Title: The Astrophysical Journal Volume: 838 Issue: 2 Pages: 153-153
  • DOI: 10.3847/1538-4357/838/2/153
  • Peer Reviewed / Open Access
• [Journal Article] The UBV Color Evolution of Classical Novae. II. Color--Magnitude Diagram (2016)
  • Author(s): Hachisu, Izumi; Kato, Mariko
  • Journal Title: The Astrophysical Journal Supplement Series Volume: 223 Issue: 2 Pages: 1-62
  • DOI: 10.3847/0067-0049/223/2/21
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Shortest recurrence periods of forced novae (2016)
  • Author(s): Hachisu, I., Saio, H., and Kato, M.
  • Journal Title: Astrophys. J. Volume: 824 Issue: 1 Pages: 1-10
  • DOI: 10.3847/0004-637x/824/1/22
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] X-ray flashes in recurrent novae (2016)
  • Author(s): Kato, M., Saio, H., Henze, M., J-W. Ness, J.P. Osborne, K.L. Page, M.J. Darnley, M.F. Bode, A. W. Shafter, M. Hernanz, N. Gehrels
  • Journal Title: Astrophys. J. Volume: 830 Issue: 1 Pages: 1-12
  • DOI: 10.3847/0004-637x/830/1/40
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] M31N 2008-12a - the remarkable recurrent nova in M31: Pan-chromatic observations of the 2015 eruption (2016)
  • Author(s): Darnley, M.J., Henze, M. F. Bode, I. Hachisu, M. Hernanz, K. Hornoch, R. Hounsell,
  • Journal Title: Astrophys, J. Volume: 833 Issue: 2 Pages: 1-38
  • DOI: 10.3847/1538-4357/833/2/149
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Light curve analysis of neon novae (2016)
  • Author(s): Izumi Hachisu and Mariko Kato
  • Journal Title: Astrophysica Journal Volume: 816 Issue: 1 Pages: 26-26
  • DOI: 10.3847/0004-637x/816/1/26
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Multi-wavelength light curve model of the one-year recurrence period nova M31N2008-12a (2015)
  • Author(s): Mariko Kato, Hideyuki Saio, and Izumi Hachisu
  • Journal Title: Astrophysical Journal Volume: 808 Issue: 1 Pages: 52-52
  • DOI: 10.1088/0004-637x/808/1/52
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] A remarkable recurrent nova in M 31: Discovery and optical/UV observations of the predicted 2014 eruption (2015)
  • Author(s): M. J. Darnley, M. Henze, Ｉ．Ａ．Ｓｔｅｅｌｅ，Ｍ．Ｆ．Ｂｏｄｅ，Ｖ．Ａ．Ｒ Ｍ．Ｒｉｂｅｉｒｏ，Ｐ．Ｒｏｄｒｉｇｅｚ－Ｇｉｌ，Ａ．Ｗ．Ｓｈａｆｔｅｒ，Ｓ．Ｃ．Ｗｉｌｌｉａｍｓ，Ｄ．Ｂａｅｒ，Ｉ．Ｈａｃｈｉｓｕ，Ｍ．Ｈｅｒｎａｎｚ，Ｋ．Ｈｏｒｎｏｃｈ，Ｒ．Ｈｏｕｎｓｅｌｌ，Ｍ．Ｋａｔｏ，＆ ９ ａｕｔｈｏｒｓ
  • Journal Title: Astronomy and Astrophysics Volume: 580 Pages: A45-A45
  • DOI: 10.1051/0004-6361/201526027
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] A remarkable recurrent nova in M 31: The predicted 2014 outburst in X-rays with Swift (2015)
  • Author(s): M. Henze, J.-U. Ness, M. J. Darnley, M. F. Bode, S. C. Williams, A. W. Shafter, G. Sala,
  • Journal Title: Astronomy and Astrophysics Volume: 580 Pages: A46-A46
  • DOI: 10.1051/0004-6361/201526028
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] A Millenium-long evolution of a very short recurrence period nova - 1500 outbursts until He ignition (2017)
  • Author(s): Kato, M.
  • Organizer: WS on M31N 2008-12a
  • Place of Presentation: バルセロナ（スペイン）
  • Year and Date: 2017-03-07
  • Int'l Joint Research / Invited
• [Presentation] Recurrent novae and long-term evolution of mass-accreting WDs-toward the accurate mass retention efficiency (2017)
  • Author(s): Kato, Mariko
  • Organizer: The Golden Age of Cataclysmic-Variables and Related Objects IV
  • Int'l Joint Research / Invited
• [Presentation] １年周期の回帰新星 M31N 2008-12a (2016)
  • Author(s): 加藤万里子
  • Organizer: 連星系・変光星・低温度星研究会
  • Place of Presentation: 横浜市（慶應義塾大学来往舎）
  • Year and Date: 2016-10-30
• [Presentation] Current theoretical understanding of M31N 2008-12a (2016)
  • Author(s): 加藤万里子
  • Organizer: nova WS
  • Place of Presentation: バルセロナ（スペイン）
  • Year and Date: 2016-03-03
  • Int'l Joint Research / Invited
• [Presentation] Ｔｈｅｏｒｙ ｏｆ ｃｌａｓｓｉｃａｌ ｎｏｖａｅ (2015)
  • Author(s): 加藤万里子
  • Organizer: The golden age of chatacrismic variables and related object
  • Place of Presentation: パレルモ（イタリア）
  • Year and Date: 2015-09-07
  • Int'l Joint Research / Invited