Research & Activities


Genda, Hidenori

Genda, Hidenori
Genda, Hidenori
Associate PI
Planet formation


Main Publication List and Awards

24. Genda, H. (2016) Origin of Earth’s Oceans: An Assessment of the Total Amount, History and Supply of Water. Geochemical Journal 50, 27-42. doi:10.2343/geochemj.2.0398

23. Kodama, T., Genda, H., Abe, Y., and Zahnle, K. (2015) Rapid Water Loss can Extend the Lifetime of the Planetary Habitability. The Astrophysical Journal 812, 165 (11pp).

22. Genda, H., Fujita, T., Kobayashi, H., Tanaka, H., and Abe, Y. (2015) Resolution Dependence of Disruptive Collisions between Planetesimals in the Gravity Regime. Icarus 262, 58-66.

21. Genda, H., Kobayashi, H., and Kokubo, E. (2015) Warm Debris Disks Produced by Giant Impact During Terrestrial Planet Formation. Astrophysical Journal 810, 136 (8pp).

20. Citron, R. I., Genda, H., and Ida, S. (2015) Formation of Phobos and Deimos via a giant impact. Icarus 252, 334-338.

19. Sekine, Y., Genda, H., Muto, Y., Sugita, S., Kadono, T., and Matsui, M. (2014) Impact chemistry of methanol: Implications for volatile evolution on icy satellites and dwarf planets, and cometary delivery to the Moon. Icarus 243 39-47.

18. Genda, H., Kobayashi, H., and Kokubo, E. (2014) Giant impacts and debris disks. Proceedings IAU Symposium 293, 270-272.

17. Kodama, T., Genda, H., Abe, Y., and Zahnle, K. (2014) Re-evaluation of the inner edge of habitable zone. Proceedings IAU Symposium, 293 323-325.

16. Takao, Y., Genda, H., Wakida, M., and Abe, Y. (2014) The complete evaporation limit of land planets. Proceedings IAU Symposium 293, 336-338.

15. Hamano, K., Abe, Y., and Genda, H. (2013) Emergence of two types of terrestrial planet on solidification of magma ocean. Nature 497, 607-610.

14. Maruyama, S., Ikoma, M., Genda, H., Hirose, K., Yokoyama, T., and Santosh, M. (2013) The naked planet Earth: Most essential pre-requisite for the origin and evolution of life. Geoscience Frontiers 4, 141-165.

13. Genda, H., Kokubo, E., and Ida, S. (2012) Merging criteria for giant impacts of protoplanets. The Astrophysical Journal 744, 137(8pp).

12. Sekine, Y., and Genda, H. (2012) Giant impacts in the Saturnian System: a possible origin of diversity in the inner mid-sized satellites. Planetary and Space Science 63, 133-138.

11. Hong, P. K., Sugita, S., Okamura, N., Sekine, Y., Terada, H., Takatoh, N., Hayano, Y., Fuse, T., Pyo, T., Kawakita, H., Wooden, D. H., Young, E. F., Lucey, P. G., Kurosawa, K., Genda, H., Haruyama, J., Furusho, R., Kadono, T., Nakamura, R., Kamata, S., Hamura, T., Sekiguchi, T., Soma, M., Noda, H., and Watanabe, J. (2011) A ground-based observation of the LCROSS impact events using the Subaru Telescope. Icarus 214, 21-29.

10. Sekine, Y., Genda, H., Sugita, S., Kadono, T., and Matsui, T. (2011) Replacement and late formation of atmospheric N2 on undifferentiated Titan by impacts. Nature Geoscience 4, 359-362.

9. Kokubo, E., and Genda, H. (2010) Formation of terrestrial planets from protoplanets under a realistic accretion condition. The Astrophysical Journal Letter 714, L21-L25.

8. Fukuzaki, S., Sekine, Y., Genda, H., Sugita, S., Kadono, T., and Matsui, T. (2010) Impact-induced N2 production from ammonium sulfate: Implications for the origin and evolution of N2 in Titan's atmosphere. Icarus 209, 715-722.

7. Genda, H., Ikoma, M., Guillot, T., and Ida, S. (2008) Formation of heavy element rich giant planets by giant impacts. In: Sun, Y.-S., Ferraz-Mello, S. and Zhou, J.-L. (Eds), Exoplanets: Detection, Formation and Dynamics, Proceedings IAU Symposium 249, 267-270.

6. Genda, H., and Ikoma, M. (2008) Origin of the ocean on the Earth: Early evolution of water D/H in a hydrogen-rich atmosphere. Icarus 194, 42-52.

5. Ikoma, M., Guillot, T. Genda, H., Tanigawa, T., and Ida, S. (2006) On the origin of HD149026b. The Astrophysical Journal 650, 1150-1159.

4. Ikoma, M., and Genda, H. (2006) Constraints on the mass of a habitable planet with water of nebular origin. The Astrophysical Journal 648, 695-706.

3. Genda, H., and Abe, Y. (2005) Enhanced atmospheric loss on protoplanets at the giant impact phase in the presence of oceans. Nature 433, 842-844.

2. Genda, H., and Abe, Y. (2003) Survival of a proto-atmosphere through the stage of giant impacts: the mechanical aspects. Icarus 164, 149-162.

1. Genda, H., and Abe, Y. (2003) Modification of a proto-lunar disk by hydrodynamic escape of silicate vapor. Earth Planets and Space 55, 53-57.


Best Presentation Award at Fall Meeting of Japan Society of Planetary Science (2003)

Research Interests

My research interest is the origins of the characteristics of planets. I have researched to clarify how the characteristics of planets formed and evolved. For example, there is a different in size among the planets in our solar system, and the atmospheric composition and amount of the Earth are totally different from those of Venus despite the similarity of their planetary size. Moreover, the Earth has the ocean, and life emerged and evolved on it. My research goal is to understand how these characteristics formed. Recently, many planets beyond our solar system have been discovered. The variety of these exoplanets is found to be wider than that of the planets in our solar system. We are now at the stage of being able to understand what is the uniqueness or universality in the Earth.

My research approach is a blend of theory and computer simulation. It is impossible that we include all the processes hidden in nature into theory or computer simulation. Therefore, the most important thing is to extract the important processes from the nature. It is important to daily discuss with researchers who are in various research fields and approaches. ELSI is the best place where I can do so. Here I will do my best to answer the ultimate question “Why did life emerge and evolve?”