Stevanus Kristianto Nugroho, PhD

Research Interests

Observational astronomy | High-resolution spectroscopy | Exoplanet atmosphere

Employment

• Assistant professor, Dept. Earth and Planetary Sciences, Institute of Science Tokyo (October 2025-Present)
• Project research staff, Exo-planet Search Project Office, Astrobiology Center (November 2020-September 2025)
• Post-doctoral research fellow, Astrophyics Research Centre, Queen’s University Belfast (October 2018-October 2020)

Education

• PhD, Astronomy, Tohoku University, Japan (October 2015-September 2018)
• M.Sc., Astronomy, Tohoku University, Japan (October 2013-September 2015)
• B.Sc., Physics, Institut Teknologi Sepuluh Nopember Surabaya, Indonesia (August 2009-February 2013)

Grants

• JSPS Grants-in-Aid for Scientific Research – KAKENHI Number 22K14092, April 2022-March 2026, "Project Horizon: Exploring the Atmosphere of Tidally-locked Worlds using High-resolution Spectroscopy", 4.55 million JPY

Honors & Awards

• ASJ Young Astronomer Award from the Astronomical Society of Japan, 2025
• The 13th Izumihagikai Encouragement Award from Physics Alumni Association of Tohoku University Japan, 2021
• Indonesia Endowment Fund for Education Scholar Fellow (Doctoral degree), Sendai, Japan, 2015-2018
• Indonesia Endowment Fund for Education Scholar Fellow (Master degree), Sendai, Japan, 2013-2015
• Cawan Getsemani Scholarship, Surabaya, Indonesia, 2009-2013
• Honorable mention, 3rd International Olympiad on Astronomy and Astrophysics, Teheran, Iran, 2009
• Gold medal, National Olympic on Astronomy, Makassar, Indonesia, 2008

Other activities

• Referee for major astrophysical journals (Astronomy & Astrophysics, MNRAS, Astronomical Journal, and Astrophysical Journal)
• Member of InfraRed Seminar's Organiser at the Astrobiology Center (April 2024- September 2025)

Skills

• Programming: Git, Python, IRAF, Latex, JAX
• Languages: Bahasa Indonesia (Native), Javanese (Native), English (Fluent), Japanese (Basic)

Selected peer-reviewed papers | NASA ADS (click me)

• Evidence of Water Vapor in the Atmosphere of a Metal-Rich Hot Saturn with High-Resolution Transmission Spectroscopy
  Sayyed Ali Rafi, Stevanus K Nugroho, et al. 2024, AJ,
• High-resolution emission spectroscopy retrievals of MASCARA-1b with CRIRES+: strong detections of CO, H2O, and Fe emission lines and a C/O consistent with solar
  Swaetha Ramkumar, Neale Gibson, Stevanus K Nugroho, et al. 2023, MNRAS
• A Spectroscopic Thermometer: Individual Vibrational Band Spectroscopy with the Example of OH in the Atmosphere of WASP-33b
  Sam O. M. Wright, Stevanus K Nugroho, Matteo Brogi et al. 2023, AJ
• First Detection of Hydroxyl Radical Emission from an Exoplanet Atmosphere: High-dispersion Characterization of WASP-33b using Subaru/IRD
  Stevanus K. Nugroho, Hajime Kawahara, Neale P Gibson, et al. 2021. ApJ.
• High-resolution atmospheric retrievals of WASP-121b transmission spectroscopy with ESPRESSO: Consistent relative abundance constraints across multiple epochs and instruments
  Cathal Maguire, Neale P. Gibson, Stevanus K Nugroho, et al. 2023, MNRAS
• High-Resolution Transmission Spectroscopy of the Terrestrial Exoplanet GJ 486b
  Andrew Ridden-Harper, Stevanus K Nugroho, et al. 2023, AJ,
• Day-side Fe I Emission, Day-Night Brightness Contrast and Phase Offset of the Exoplanet WASP-33b
  Miranda K Herman, Ernst JW de Mooij, Stevanus K Nugroho, et al. 2022, AJ,
• Detection of Fe I Emission in the Dayside Spectrum of WASP-33b
  Stevanus. K. Nugroho, Neale P. Gibson, Ernst JW de Mooij, et al. 2020. ApJ.
• Searching for thermal inversion agents in the transmission spectrum of KELT-20b/MASCARA-2b: detection of neutral iron and ionised calcium H&K lines
  Stevanus K. Nugroho, N. P. Gibson, E. J. W. de Mooij, et al. 2020. MNRAS.
• Relative abundance constraints from high-resolution optical transmission spectroscopy of WASP-121b, and a fast model-filtering technique for accelerating retrievals
  Neale P Gibson, Stevanus K Nugroho, Joshua Lothringer, Cathal Maguire, David K Sing, 2022, MNRAS
• Detection of Fe I in the atmosphere of the ultra-hot Jupiter WASP-121b, and a new likelihood-based approach for Doppler-resolved spectroscopy
  Neale P Gibson, Stephanie Merritt, Stevanus K Nugroho, et al. 2020, MNRAS.
• High-resolution Spectroscopic Detection of TiO and a Stratosphere in the Day-side of WASP-33b
  Stevanus K. Nugroho, Hajime Kawahara, Kento Masuda, et al. 2017. AJ.

Selected approved telescope proposals

PI proposals

• Day-side Chemical Phase-curve of an Ultra-hot Jupiter, 113.26QQ, CRIRES+-VLT, 2 nights
• InfraRed Coolants in the Atmosphere of the Coldest Ultra Hot Jupiter, S24A-097, IRD-Subaru telescope, 1.5 night
• 3D Atmosphere of an Ultra-hot Jupiter, S23B-073, IRD-Subaru telescope, 1.5 night
• Probing the 3D Properties and the Variability of an Ultra Hot Jupiter's Atmosphere, S21A-OT22, HDS-Subaru telescope, 0.5 night
• Probing the 3D Properties and the Variability of an Ultra Hot Jupiter's Atmosphere, GN-2021A-FT-217, GRACES-Gemini North, 0.5 night
• Characterising the atmosphere of the extremely hot-Jupiter WASP-33b, S21B-111, IRD-Subaru telescope, 2 nights
• WASP-189b as a twin sibling of ultra hot jupiter WASP-33b, or is it?, 2021B034, SPIRou-CFHT, 1.5 nights
• Unveiling the Atmosphere of a Hot Jupiter around a Binary Stellar System, 2020B034, Veloce-AAT, 1 night
• WASP-189b as a twin sibling of ultra hot jupiter WASP-33b, or is it?, 2020A039, CARMENES-CAHA, 1.3 nights; SPIRou-CFHT, 1 night
• De-mystifying WASP-33b's atmosphere using CARMENES, 2019B043, CARMENES-CAHA, 1.5 nights
• CO detection of directly imaged exoplanet, S16B-075N, IRCS-Subaru telescope, 1 night

co-I proposals

• Spatially resolving the atmosphere of the Ultra-hot Jupiter MASCARA-1b with CRIRES+, 112.260X, CRIRES+-VLT, 0.5 night; PI: Neale Gibson
• Showcasing the potential of CRIRES+ for exoplanet spectroscopy: a phase curve of the ultra-hot Jupiter MASCARA-1b, 107.22TQ, CRIRES+-VLT, 5 hours; PI: Neale Gibson
• Peeking above the clouds: exoplanet atmospheres and winds at high spectral resolution with ESPRESSO, 106.21R1, ESPRESSO-VLT, 1.4 nights; PI: Neale Gibson
• Finding methane/ammonia in a cloudless warm Neptune, S20A0019N, IRD-Subaru telescope, 0.5 nights; PI: Hajime Kawahara
• Storms or Systematics? Investigating the changing eclipse depth of ultra-hot Jupiter WASP-12b, 2019B052, ANDOR-OHP120, 4 nights; BUSCA-CAHA22, 4 nights; ALFOSC-NOT, 4 nights; PI: Matthew Hooton
• Peeking above the clouds: Exoplanet atmospheres at high spectral resolution with ESPRESSO, 0104.C-0642(A), ESPRESSO-VLT, 1.4 nights; PI: Neale Gibson
• Probing thermal inversion in hot-Jupiter's atmosphere with IRD, S19A0074N, IRD-Subaru telescope, 1 night; PI: Masato Ishizuka