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Yasuhiro Hasegawa

Photo of Yasuhiro Hasegawa


4800 Oak Grove Drive
M/S 169-238

Pasadena, CA 91109





Curriculum Vitae:

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Member of:

Exoplanet Discovery and Science


Yasuhiro Hasegawa is a research scientist at NASA's Jet Propulsion Laboratory. His research is focused on the overlap between exoplanetary and planetary sciences. He develops a number of theoretical modeling of planet formation, and performs a comprehensive investigation of planet formation in star-forming regions, covering a full size range from tiny, micron-mm dust grains to planetesimals and up to fully formed planets. He actively builds up a number of independent and collaborative projects, wherein observations, numerical simulations, theoretical modeling, and lab experiments are all combined to take the best advantage of each approach. In addition, he works on a newly developing area of planet formation in which formation processes that are intimately coupled with disk evolution are statistically examined, through comparison with the extrasolar and solar planetary systems.


  • Ph.D., McMaster University, Canada (2012)
  • M.Sc., McMaster University, Canada (2008)
  • B.Sc., Tokyo University of Science, Japan (2006)

Professional Experience

  • JPL: Research Scientists, 2017-present, Exoplanetary Science Initiative Postdoctoral Fellow, 2015-2017
  • EACOA Postdoctoral Fellow, 2012-2015
  • National Astronomical Observatory of Japan (NAOJ), 2014-2015
  • Academia Sinica, Institute of Astronomy and Astrophysics (ASIAA), 2012-2014

Research Interests

  • Formation of stars and planetary systems
  • Evolution of protoplanetary disks, planetary systems, and planetary atmospheres Origins of the solar and extrasolar systems
  • Big data and machine learning

Selected Awards

CASCA Plaskett Medal for the best PhD thesis in Canada (2013)

Selected Publications

44. Bi, J., van der Marel, N., Dong, R., Muto, T., Martin, R. G., Smallwood, J. L., Hashimoto, J., Liu, H. B., Nomura, N., Hasegawa, Y., Takami, M., Konishi, M., Momose, M., Kanagawa, K. D., Kataoka, A., Ono T., Sitko, M. L., Takahashi, S. Z., Tomida, K., & Tsukagoshi, T. (2020), "GW Ori: Interactions Between a Triple-star System and its Circumtriple Disk in Action", ApJL, 895, L18

43. Kim, S., Takahashi, S., Nomura, H., Tsukagoshi, T., Lee, S., Muto, T., Dong, R., Hasegawa, Y., Hashimoto, J., Kanagawa, K., Kataoka, A., Konishi, M., Liu, H. B., Momose,M., Sitko,M., & Tomida, K.(2019), "The detection of dust gap-ring structure in the outer region of the CR Cha protoplanetary disk", ApJ, 888, 72

42. Matsumoto, Y., Wakita, S., Hasegawa, Y., & Oshino, S. (2019), "Aggregate Growth and Internal structures of Chondrite Parent Bodies Forming from Dense Clumps", ApJ, 887, 248

41. Liu, H. B., Merand, A., Green, J. D., Perez, S., Hales, A. S., Yang, Y.-L., Dunham, M. M., Hasegawa, Y., Henning, T., Galvan-Madrid, R., Kospal, A., Takami, M., Vorobyov, E. I., & Zhu, Z. (2019), "Diagnosing 0.1-10 au scale morphology of the FU Ori disk using ALMA and VLTI/GRAVITY", ApJ, 884, 97

40. Oshino, S., Hasegawa, Y., Wakita, S., & Matsumoto, Y. (2019), "The Properties of Planetesimal Collisions under Jupiter's Perturbation and the Application to Chondrule Formation via Impact Jetting", ApJ, 884, 37

39. Flock, M., Turner, N. J., Mulders, G. D., Hasegawa, Y., Nelson, R. P., & Bitsch, B..(2019), "Planet formation and migration near the silicate sublimation front in protoplanetary disks", A&A, 630, A147

38. Hasegawa, Y., Yu, T. Y. M., & Hansen, B. M. S. (2019), "Close-in giant-planet formation via in-situ gas accretion and their natal disk properties", A&A, 629, L1

37. Cazzoletti, P., Manara, C. F., Baobab Liu, H., van Dishoeck, E. F., Facchini, S., Alcala, J. M., Ansdell, M., Testi, L., Williams, J. P., Carrasco-Gonzalez, C., Dong, R., Forbrich, J., Fukagawa, M., Galvan-Madrid, R., Hirano, N., Hogerheijde, M., Hasegawa, Y., Muto, T., Pinilla, P., Takami, M., Tamura, M.;,Tazzari, M., & Wisniewski, J. P. (2019), "ALMA survey of Class II protoplanetary disks in Corona Australis: a young region with low disk masses", A&A, 626, A11

36. Hasegawa, Y., Hansen, B. M. S., & Vasisht, G. (2019), "The Heavy-element Content Trend of Planets: A Tracer of Their Formation Sites", ApJL, 876, L32

35. Sengupta, D., Dodson-Robinson, S., Hasegawa, Y., & Turner, N. J. (2019), "Growth and Settling of Dust Particles in Protoplanetary Nebulae: Implications for Opacity, Thermal Profile, and Gravitational Instability", ApJ, 874, 26

34. Kudo, T., Hashimoto, J., Muto, T., Liu, H. B., Dong, R., Hasegawa, Y., Tsukagoshi, T., & Konishi, M. (2018), "A Spatially Resolved AU-scale Inner Disk around DM Tau", ApJL, 868, L5

33. Hasegawa, Y., Bryden, G., Ikoma, M., Vasisht, G., & Swain, M. (2018), "The Origin of Heavy-element Content Trend in Giant Planets via Core Accretion", ApJ, 865, 32

32. Liu, H. B., Hasegawa, Y., Ching, T.-C., Lai, S.-P., Hirano, N., & Rao, R. (2018), "Detection of 40-48 GHz dust continuum linear polarization towards the Class 0 young stellar object IRAS 16293-2422", A&A, 617, A3

31. Wakita, S., Hasegawa, Y., & Nozawa, T. (2018), "Abundances of ordinary chondrites in thermally evolving planetesimals", ApJ, 863, 100

30. Dong, R., Liu, S.-Y., Eisner, J., Andrews, S., Fung, J., Zhu, Z., Chiang, E., Hashimoto, J., Liu, H. B., Casassus, S., Esposito, T., Hasegawa, Y., Muto, T., Pavlyuchenkov, Y., Wilner, D., Akiyama, E., Tamura, M., & Wisniewski, J. (2018), "The Eccentric Cavity, Triple Rings, Two-armed Spirals, and Double Clumps of the MWC 758 Disk", ApJ, 860, 124

29. Long, Z. C., Akiyama, E., Sitko, M., Fernandes, R. B., Assani, K., Grady, C. A., Cure, M., Danchi, W. C., Dong, R., Fukagawa, M., Hasegawa, Y., Hashimoto, J., Henning, T., Inutsuka, S-I., Kraus, S., Kwon, J., Lisse, C. M., Liu, H. B., Mayama, S., Muto, T., Nakagawa, T., Takami, M., Tamura, M., Currie, T., Wisniewski, J. P., & Yang, Y. (2018), "Differences in the Gas and Dust Distribution in the Transitional Disk of a Sun-like Young Star, PDS 70", ApJ, 858, 112

28. Hasegawa, Y., Okuzumi, S., Flock, M., & Turner, N. J. (2017), "Magnetically Induced Disk Winds and Transport in the HL Tau Disk", ApJ, 845, 31

27. Liu, H. B., Vorobyov, E. I., Dong, R., Dunham, M. M., Takami, M., Galvan-Madrid, R., Hashimoto, J., Kospal, A., Henning, T., Tamura, M., Rodriguez, L. F., Hirano, N., Hasegawa, Y., Fukagawa, M., Carrasco-Gonzalez, C., & Tazzari, M. (2017), "A Concordant Scenario to Explain FU Ori from Deep Centimeter and Millimeter Interferometric Observations", A&A, 602, 19

26. Li, J. I-H., Liu, H. B., Hasegawa, Y., & Hirano, N. (2017), "Systematic Analysis of Spectral Energy Distributions and the Dust Opacity Indices for Class 0 Young Stellar Objects", ApJ, 840, 72

25. Long, Z. C., Fernandes, R. B., Sitko, M., Wanger, K., Muto, T., Hashimoto, J., Follette, K., Grady, C. A., Fukagawa, M., Hasegawa, Y., Kluska, J., Kraus, S., Miyama, S., McElwain, M. W., Oh, D., Tamura, M., Uyama, T., Wisniewski, J. P., & Yang, Y. (2017), "The Shadow Knows: Using Shadows to Investigate the Structure of the Pretransitional Disk of HD 100453", ApJ, 838, 62

24. Matsumoto, Y., Oshino, S., Hasegawa, Y., & Wakita, S. (2017), "Chondrule Accretion with a Growing Protoplanet", ApJ, 837, 103

23. Harada, N., Hasegawa, Y., Aikawa, Y., Hirashita, H., Liu, H. B., & Hirano, N. (2017), "Effects of Grain Growth on Molecular Abundances in Young Stellar Objects", ApJ, 837, 78

22. Wakita, S., Nozawa, T., & Hasegawa, Y. (2017), "Diffusion of Oxygen Isotopes in Thermally Evolving Planetesimals and Size Ranges of Presolar Silicate Grains", ApJ, 836, 106

21. Wakita, S., Matsumoto, Y., Oshino, S., & Hasegawa, Y. (2017), "Planetesimal Collisions as a Chondrule Forming Event", ApJ, 834, 125

20. Akiyama, E., Hashimoto, J., Liu, H. B., Li, I-H., Bonnefoy, M., Dong, R., Hasegawa, Y., Henning, T., Sitko, M. L., Janson, M., Feldt, M., Wisniewski, J. P., Kudo, T., Kusakabe, N., Tsukagoshi, T., Momose, M., Muto, T., Taki, T., Kuzuhara, M., Mayama, S., Takami, M., Ohashi, N., Grady, C. A., Kwon, J., Thalmann, C., Abe, L., Brandner, W., Brandt, T. D., Carson, J. C., Egner, S., Goto, M., Guyon, O., Hayano, Y., Hayashi, M., Hayashi, S. S., Hodapp, K. W., Ishii, M., Iye, M., Knapp, G. R., Kandori, R., Matsuo, T., McElwain, M. W., Miyama, S., Morino, J.-I., Moro-Martin, A., Nishimura, T., Pyo, T.-S., Serabyn, E., Suenaga, T., Suto, H., Suzuki, R., Takahashi, Y. H., Takato, N., Terada, H., Tomono, D., Turner, E. L., Watanabe, M., Yamada, T., Takami, H., Usuda, T., & Tamura, M. (2016), "Spiral Structure and Differential dust size Distribution in the LkHa 330 Disk", AJ, 152, 222

  1. Hasegawa, Y. (2016), "Super-Earths as Failed Cores in Orbital Migration Traps", ApJ, 832, 83
  2. Liu, H. B., Lai, S.-Pi., Hasegawa, Y., Hirano, N., Rao, R., Li, I-H., Fukagawa, M., Girart, Carrasco-Gonzalez, C., & Rodriguez, L. F. (2016). "Detection of Linearly Polarized 6.9 mm Continuum Emission from the Class 0 Young Stellar Object NGC1333 IRAS4A", ApJ, 821, 41
  3. Hasegawa, Y., Turner, N. J., Masiero, J., Wakita, S., Matsumoto, Y., & Oshino, S. (2016), "Forming Chondrites in a Solar Nebula with Magnetically induced Turbulence", ApJ, 820, L12
  4. Akiyama, E., Hasegawa, Y., Hayashi, M., & Iguchi, S. (2016), "Planet System Formation in Protoplanetary Disk around HL Tauri", ApJ, 818, 158
  5. Liu, H. B., Galvan-Madrid, R., Vorobyov, E. I., Kospal, A., Rodriguez, L. F., Dunham, M. M., Hirano, N., Henning, T., Takami, M., Dong, R., Hashimoto, J., Hasegawa, Y., & Carrasco-Gonzalez, C. (2016), "Absence of Significant Cold Disks in Young Stellar Objects Exhibiting Repetitive Optical Outbursrs", ApJ, 816, L29
  6. Hasegawa, Y., Wakita, S., Matsumoto, Y., & Oshino, S. (2016), "Chondrule Formation via Impact Jetting Triggered by Planetary Accretion", ApJ, 816, 8
  7. Hasegawa, Y., & Takeuchi, T. (2015) ,"Viscous Instability Triggered by Layered Accretion in Protoplanetary Disks", ApJ, 815, 99
  8. Nozawa, T., Wakita, S., Hasegawa, Y. & Kozasa, T. (2015), "Probing the Physical Conditions of Supernova Ejecta with the Measured Sizes of Presolar Al$_2$O$_3$ Grains", ApJL, 811, L39
  9. Takami, M., Hasegawa, Y., Muto, T., Gu, P.-G., Dong, R., Karr, J. L., Hashimoto, J., Kusakabe, N., Chapillon, E., Tang, Y.-W., Itoh, Y.,; Carson, J., Follette, K. B., Mayama, S., Sitko, M., Janson, M., Grady, C. A., Kudo, T., Akiyama, E., Kwon, J., Takahashi, Y., Suenaga, T., Abe, L., Brandner, W., Brandt, T. D., Currie, T., Egner, S. E., Feldt, M., Guyon, O., Hayano, Y., Hayashi, M., Hayashi, S., Henning, T., Hodapp, K. W., Honda, M., Ishii, M., Iye, M., Kandori, R., Knapp, G. R., Kuzuhara, M., McElwain, M. W., Matsuo, T., Miyama, S., Morino, J.-I., Moro-Martin, A., Nishimura, T., Pyo, T.-S., Serabyn, E., Suto, H., Suzuki, R., Takato, N., Terada, H., Thalmann, C., Tomono, D., Turner, E. L., Wisniewski, J. P., Watanabe, M., Yamada, T., Takami, H., Usuda, T., & Tamura, M. (2014), "Surface Geometry of Protoplanetary Disks Inferred From Near-Infrared Imaging Polarimetry", ApJ, 795, 71
  10. Hasegawa, Y. & Pudrtiz, R. E. (2014), "Planet Traps and Planetary Cores: Origins of the Planet-Metallicity Correlation", ApJ, 794, 25
  11. Galvan-Madrid, R., Liu, H. B., Manara, C. F., Forbrich, J., Pascucci, I., Carrasco-Gonzalez, C., Goddi, C., Hasegawa, Y., Takami, M., & Testi, L. (2014), "Constraints on Photoevaporation Models from (Lack of) Radio Emission in the Corona Austrails Protoplanetary Disks", A&A, 570, L9
  12. Hasegawa, Y. & Hirashita, H. (2014), "Planet Traps and First Planets: the Critical Metallicity for Gas Giant Formation", ApJ, 788, 62
  13. Hasegawa, Y. & Pudrtiz, R. E. (2013), "Planetary Populations in the Mass-Period Diagram: A Statistical Treatment of Exoplanet Formation and the Role of Planet Traps", ApJ, 778, 78
  14. Hasegawa, Y. & Ida, S. (2013), "Do Giant Planets Survive Type II Migration?", ApJ, 774, 146
  15. Hasegawa, Y. & Pudritz, R. E. (2012), "Evolutionary Tracks of Trapped, Accreting Protoplanets: the Origin of the Observed Mass-Period Relation", ApJ, 760, 117
  16. Hasegawa, Y. & Pudritz, R. E. (2011), "The Origin of Planetary System Architectures -I. Multiple Planet Traps in Gaseous Discs", MNRAS, 417, 1236
  17. Hasegawa, Y. & Pudritz, R. E. (2011), "Dust Settling and Rapid Planetary Migration", MNRAS, 413, 286
  18. Hasegawa, Y. & Pudritz, R. E. (2010), "Dead Zones as Thermal Barriers to Rapid Planetary Migration in Protoplanetary Disks", ApJ, 710, L167
  19. Hasegawa, Y. & Pudritz, R. E. (2010), "Radiatively Heated, Protoplanetary Discs with Dead Zones -I. Dust Settling and Thermal Structure of Discs around M Stars", MNRAS, 401, 143