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Artist impression of fullerenes in front of a planetary nebulae.
The location of the C60 containing Planetary Nebulae (blue symbols) in the Milky Way
Herschel Detects a Massive Dust Reservoir in Supernova 1987A
Otsuka, Masaaki
Assistant Research Scholar
photo of Otsuka, Masaaki
Office: ASMAB 1302
TEL: +886-2-2366-5417
FAX: +886-2-2367-7849
Email: otsuka_replace2@_asiaa.sinica.edu.tw

Education and Positions

  • Assistant Research Scholar (2015~present)
  • Visiting Scholar (2015~present)
  • Subaru Telescope, National Astronomical Observatory of Japan (Support Astronomer) (2014~2015)
  • Academia Sinica Institute of Astronomy and Astrophysics (Posdoc) (2011~2014)
  • Space Telescope Science Institute (Postdoc) (2008~2011)
  • National Astronomical Observatory of Japan, Okayama Astrophysics Observatory (Research Assistant) (2004~2008)
  • Tohoku University (Ph.D) (2001~2007)

Honors & Awards

  • 2015 MOST (Ministry of Science and Technology, ROC) assistant research scholar with MOST subsidies (2015~2018)
  • Academia Sinica Regular Postdoctoral Fellows (2012~2014)

Research Interests

During the last stages of the stellar evolution, stars eject materials enriched with atoms, molecules, and dust grains into circumstellar shells, and eventually these materials are returned back to the interstellar medium of the host galaxies. An investigation of the ejected materials from evolved stars such as asymptotic giant branch stars, planetary nebulae, and supernovae provides useful information to increase our understanding of the stellar evolution, as well as the chemical evolution of galaxies, e.g., how much of the mass of the star becomes a planetary nebula, which and how much of the elements are synthesized in the inner core of the stars, and how galaxies became chemically rich. The aim of my research is to understand stellar and galaxy evolution by investigating elemental abundances, dust grains, and molecules (e.g., fullerenes, polycyclic aromatic hydrocarbons) in evolved stars based on multiple wavelength data taken using ground-based telescopes (e.g., Subaru Telescope) and space telescopes (e.g., GALEX, HST, AKARI, Spitzer, and Herschel). Ultimately I would like to know the origin of the terrestrial life.

Recent Journal Papers

Complete List of Publications

  1. Masaaki Otsuka, "Physical properties of the planetary nebula SaSt2-3 and its surrounding environment" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: submitted,, 2017-08 [SCI]
  2. Tajitsu, A., Otsuka, M., "Luminous Molecular Hydrogen in the Galactic Halo Planetary Nebula H4-1" , The Astrophysical Journal: ,, 2015-04, submitted [SCI]
  3. Masaaki Otsuka, Toshiya Ueta, Peter A. M. van Hoof, Raghvendra Sahai, Isabel Aleman, Albert A. Zijlstra, You-Hua Chu, Eva Villaver, Marcelo L. Leal-Ferreira, Joel Kastner, Ryszard Szczerba, Katrina M. Exter, "The Herschel Planetary Nebula Survey (HerPlaNS): A Comprehensive Dusty Photoionization Model of NGC6781" , ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES: 231, 22-52, 2017-07 [SCI] (Fulltext)
  4. Masaaki Otsuka, M. Parthasarathy, A. Tajitsu, and S. Hubrig, "Physical properties of the very young PN Hen3-1357 (Stingray Nebula) based on multiwavelength observations" , ASTROPHYSICAL JOURNAL: 838(1), 71-91, 2017-03, submitted [SCI] (Fulltext)
  5. Otsuka, M.; Kemper, F.; Leal-Ferreira, M.-L.; Aleman, I.; Bernard-Salas, J.; Cami, J.; Ochsendorf, B.; Peeters, E.; Scicluna, P., "XSHOOTER spectroscopy of the enigmatic planetary nebula Lin49 in the Small Magellanic Cloud" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 462(1), 12-34, 2016-10 [SCI] (Fulltext)
  6. Hirashita, H.; Koch, P.M.; Matsushita, S.; Takakuwa, S.; Nakamura, M.; Asada, K.; Liu, H.~B.; Urate, Y.; Wang, M.-J.; Wang, W.-H.; Takahashi, S.; Tang, Y.-W.; Chang, H.-H.; Huang, K.; Morata, O.; Otsuka, M.; Lin, K.-Y.; Tsai, A.-L.; Lin, Y.-T.; Srinivasan, S.; Martin-Cocher, P.; Pu, H.-Y.; Kemper, F.; Patel, N.; Grimes, P.; Huang, Y.-D.; Han, C.-C.; Huang, Y.-R.; Nishioka, H.; Lin, L.~C.-C.; Zhang, Q.; Keto, E.; Burgos, R.; Chen, M.-T.; Inoue, M.; Ho, P.T.P., "First-generation science cases for ground-based terahertz telescopes" , PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN: 68, R1, 2016-02 [SCI] (Fulltext)
  7. Otsuka, M., "Chemical Abundances in the PN Wray16-423 in the Sagittarius Dwarf Spheroidal Galaxy: Constraining the Dust Composition" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 452(4), 4070-4093, 2015-10 [SCI] (Fulltext)
  8. Otsuka, M., Hyung, S., Tajitsu, A., "Chemical Abundances and Dust in the Halo Planetary Nebula K648 in M15: Its Origin and Evolution Based on an Analysis of Multiwavelength Data" , The Astrophysical Journal Supplement Series: 217(2), 22-46, 2015-04 [SCI] (Fulltext)
  9. Naslim, N., Kemper, F., Madden, S.~C., Hony, S., Chu, Y.-H., Galliano, F., Bot, C., Yang, Y., Seok, J., Oliveira, J.~M., van Loon, J.~T., Meixner, M., Li, A., Hughes, A., Gordon, K.~D., Otsuka, M., Hirashita, H., Morata, O., Lebouteiller, V., Indebetouw, R., Srinivasan, S., Bernard, J.-P., Reach, W.~T., "Molecular hydrogen emission in the interstellar medium of the Large Magellanic Cloud" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 446(3), 2490-2504, 2015-01 [SCI] (Fulltext)
  10. Bruursema J; Meixner M; Long KS; Otsuka M, "A Search for Supernova Remnants in NGC 6946 Using the [Fe II] 1.64 μm Line" , ASTRONOMICAL JOURNAL: 148(3), 41, 2014-09 [SCI] (Fulltext)
  11. Ueta, T., Ladjal, D., Exter, K.M., Otsuka, M., Szczerba, R., Siódmiak, N., Aleman, I., van Hoof, P.A.M., Kastler, J.H., Montez, R., McDonald, I., Wittkowski, M., Sandin, C., Ramstedt, S., De Marco, O., Villaver, E., Chu, Y.-H., Vlemmings, W., Izumiura, H., Sahai, R., Lopez, J.A., Balick, B., Zijlstra, A., Tielens, A.G.G.M., Rattray, R.E., Behar, E., Blackman, E.G., Hebden, K., Hora, J.L., Murakawa, K., Nordhaus, J., Norden, R, Yamamura, I., "The Herschel Planetary Nebula Survey (HerPlaNS). I. Data overview and analysis demonstration with NGC 6781" , ASTRONOMY & ASTROPHYSICS: 565, A36, 2014-05 [SCI] (Fulltext)
  12. Matsuura, M., Bernard-Salas, J., Lloyd Evans, T., Volk, K.M., Hrivnak, B.J., Sloan, G.C., Chu, Y.-H., Gruendl, R., Kraemer, K.E., Peeters, E., Szczerba, R., Wood, P.R., Zijlstra, A.A., Hony, S., Ita, Y., Namath, D., Lagadec, E., Parker, Q.A., Reid, W.A., Shimonishi, T., Van Winckel, H., Woods, P.M., Kemper, F., Meixner, M., Otsuka, M., Sahai, R., Sargent, B.A., Hora, J.L., McDonald, I., "Spitzer Space Telescope spectra of post-AGB stars in the Large Magellanic Cloud - polycyclic aromatic hydrocarbons at low metallicities" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 439(2), 1472-1493, 2014-04 [SCI] (Fulltext)
  13. Otsuka, M., Kemper, F., Cami, J., Peeters, E., Bernard-Salas, J., "Physical properties of fullerene-containing Galactic planetary nebulae" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 437(3), 2577-2593, 2014-01 [SCI] (Fulltext)
  14. Otsuka, M.; Tajitsu, A., "Chemical Abundances in the Extremely Carbon and Xenon-Rich Halo Planetary Nebula H4-1" , ASTROPHYSICAL JOURNAL: 778(2), 146-157, 2013-12 [SCI] (Fulltext)
  15. Meixner, M., Panuzzo, P., Roman-Duval, J., Engelbracht, C., Babler, B., Seale, J., Hony, S., Montiel, E., Sauvage, M., Gordon, K., Misselt, K., Okumura, K., Chanial, P., Beck, T., Bernard, J.-P., Bolatto, A., Bot, C., Boyer, M. L., Carlson, L. R., Clayton, G. C., Chen, C.-H. R., Cormier, D., Fukui, Y., Galametz, M., Galliano, F., Hora, J. L., Hughes, A., Indebetouw, R., Israel, F. P., Kawamura, A., Kemper, F., Kim, S., Kwon, E., Lebouteiller, V., Li, A., Long, K. S., Madden, S. C., Matsuura, M., Muller, E., Oliveira, J. M., Onishi, T., Otsuka, M., Paradis, D., Poglitsch, A., Reach, W. T., Robitaille, T. P., Rubio, M., Sargent, B., Sewiło, M., Skibba, R., Smith, L. J., Srinivasan, S., Tielens, A. G. G. M., van Loon, J. Th., Whitney, B., "The HERSCHEL Inventory of The Agents of Galaxy Evolution in the Magellanic Clouds, a Herschel Open Time Key Program" , ASTRONOMICAL JOURNAL: 146(3), 62-96, 2013-09 [SCI] (Fulltext)
  16. Sargent, Benjamin A., Patel, N. A., Meixner, M., Otsuka, M., Riebel, D., Srinivasan, S., "CO J = 2-1 Emission from Evolved Stars in the Galactic Bulge" , The Astrophysical Journal: 765(1), 20-31, 2013-03 [SCI] (Fulltext)
  17. Otsuka, M., Kemper, F., Hyung, S., Sargent, B. A., Meixner, M., Tajitsu, A., Yanagisawa, K., "The Detection of C60 in the Well-characterized Planetary Nebula M1-11" , The Astrophysical Journal: 764(1), 77-96, 2013-01 [SCI] (Fulltext)
  18. Gallagher, Joseph S.; Sugerman, B. E. K.; Clayton, Geoffrey C.; Andrews, J. E.; Clem, J.; Barlow, M. J.; Ercolano, B.; Fabbri, J.; Otsuka, M.; Wesson, R.; Meixner, M., "Optical and Infrared Analysis of Type II SN 2006bc" , The Astrophysical Journal: 753(2), 109-117, 2012-07 [SCI] (Fulltext)
  19. Sugerman, Ben E. K.; Andrews, Jennifer E.; Barlow, Michael J.; Clayton, Geoffrey C.; Ercolano, Barbara; Ghavamian, Parviz; Kennicutt, Robert C., Jr.; Krause, Oliver; Meixner, Margaret; Otsuka, Masaaki, "Thirty Years of SN 1980K: Evidence for Light Echoes" , The Astrophysical Journal: 749(2), 170-183, 2012-04 [SCI] (Fulltext)
  20. Otsuka, Masaaki; Meixner, Margaret; Panagia, Nino; Fabbri, Joanna; Barlow, Michael J.; Clayton, Geoffrey C.; Gallagher, Joseph S.; Sugerman, Ben E. K.; Wesson, Roger; Andrews, Jennifer E.; Ercolano, Barbara; Welch, Douglas, "Late-time Light Curves of Type II Supernovae: Physical Properties of Supernovae and Their Environment" , The Astrophysical Journal: 744(1), 26-39, 2012-01 [SCI] (Fulltext)
  21. Fabbri, J.; Otsuka, M.; Barlow, M. J.; Gallagher, Joseph S.; Wesson, R.; Sugerman, B. E. K.; Clayton, Geoffrey C.; Meixner, M.; Andrews, J. E.; Welch, D. L.; Ercolano, B., "The effects of dust on the optical and infrared evolution of SN 2004et" , MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY: 418(2), 1285-1307, 2011-12 [SCI] (Fulltext)
  22. Matsuura, M.; Dwek, E.; Meixner, M.;Otsuka, M.; Babler, B.; Barlow, M. J.; Roman-Duval, J.; Engelbracht, C.; Sandstrom, K.; Lakićević, M.; van Loon, J. Th.; Sonneborn, G.; Clayton, G. C.; Long, K. S.; Lundqvist, P.; Nozawa, T.; Gordon, K. D.; Hony, S.; Panuzzo, P.; Okumura, K.; Misselt, K. A.; Montiel, E.; Sauvage, M., "Herschel Detects a Massive Dust Reservoir in Supernova 1987A" , SCIENCE: 333(6047), 1258-1261, 2011-09 [SCI] (Fulltext)
  23. Andrews, J. E.; Clayton, Geoffrey C.; Wesson, R.; Sugerman, B. E. K.; Barlow, M. J.; Clem, J.; Ercolano, B.; Fabbri, J.; Gallagher, J. S.; Landolt, A.; Meixner, M.;Otsuka, M.; Riebel, D.; Welch, D. L., "Evidence for Pre-existing Dust in the Bright Type IIn SN 2010jl" , The Astronomical Journal: 142(2), 45-50, 2011-08 [SCI] (Fulltext)
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