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  1. EAO Subaru Science Workshop 2019, KASI, 2019 January 17 A Possible Collaborationin Solar System Research for EAO Subaru • Masateru Ishiguro (Seoul National University)

  2. 1. Research Objectives • How did the planetary formation occur? • How was the Earth ocean created? • How did the life on Earth emerge? We solar system researchers look for answers in the most pristine objects in the current solar system.

  3. Altwegg et al. Science 23 Jan 2015, 347, 6220

  4. 2. From Hayabusa to Hayabusa2 Ordinary chondrite We should send another spacecraft to C-type asteroid. Image copy right: ISAS/JAXA

  5. Kuroda et al. PASJ 66, 3 (2014)

  6. Kuroda et al. PASJ 66, 3 (2014) Ryugu Moskovitz+2013

  7. Image credit (JAXA for Ryugu, NASA for Bennu) Ongoing Projects Asteroid Ryugu Asteroid Bennu The sample return is an ultimate technique for investigating the original ingredients of solar system materials. Observation research is about to shift from surfaces to interiors

  8. Cometary Outbursts

  9. Holmes Event Total dust mass (4–8)×1011 kg Total kinetic energy (1–6)×1015 J image credit John Pane via Astronomy Picture of the Day

  10. Analogical Phenomena Ishiguro, Jewitt, Hanayama et al. ApJ 787, 55 (2014) Ishiguro, Kuroda, Hanayama, et al. AJ 152, 169 (2016)

  11. *1 Ishiguro et al. AJ 152, 169, 2016 *2 Li, J. et al. ApJ 728, 1, 31, 2011 *3 Ishiguro, M. et al. ApJ 787, 1, 55, 2014 * Outbursts with E>1013 J occur annually.

  12. Asteroidal Outbursts

  13. 2-1. Impact (Cratering) (596)Scheila 50° 85° 10° Ishiguro et al. ApJ 741, 1, L24, 5 (2011)

  14. 2-1. Impacts (Catastrophe) Jewitt et al. Nature 467, 7317, 817, 2010 Kim, Y., et al. ApJL 2017, 842, 23

  15. 2-2. Rotational Breakup Jewitt et al. ApJ 784, L8 (2014) Jewitt et al. ApJ 778, L21 (2013)

  16. (596) Scheila P/2010 A2 (LINEAR) 6478 Gault 2019 January 13 (SNU Observatory)

  17. Frequencies of Asteroids and Comets Outbursts • Comet Outbursts • Finlay-class: 1~2 /year • Holmes-class: 1/100 /year • Asteroid Impacts • Catastrophe:1 /year • Cratering: 1/10 /year • Centrifugal disintegration • Asteroids >100-m: 10 /year * Ishiguro, Kuroda, Hanayama et al. AJ (2016) ** Jewitt, Hsieh & Agarwal, Asteroids IV221 (2015)

  18. Possible Research with Subaru Icy volatiles (Optical – NIR spectroscopy, e.g., Kawakita et al. 2014, Ootsubo et al. 2012) Dust morphology and mineralogy (Optical – NIR polarimetry, MIR spectroscopy, Kwon et al. 2018, Watanabe et al. 2011) Fresh internal materials, hydrated minerals (Optical – NIR spectroscopy, Usui et al. 2018)