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Kazumasa Ohno

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Assistant Professor (NAOJ fellow)

National Astronomical Observatory of Japan

Japan

Research Interests

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Professors in Japan Professors in Astronomy Astronomy professors in Japan

About

Dr. Kazumasa Ohno is an Assistant Professor and NAOJ fellow at the National Astronomical Observatory of Japan. His research focuses on atmospheric characterization of exoplanets, including the study of hot Jupiters and sub-Neptunes, as evidenced by his recent articles on atmospheric spectra, cloud formation, and chemical dynamics. His work employs advanced observational techniques from telescopes like JWST to explore planetary atmospheres and their evolutionary processes.

Recent Grants

Grant: Close

Unveiling the Planetesimal Formation Processes by Next Generation Observations of Exoplanetary Atmospheres

Open Date: 2023-08-31

Close Date: 2025-03-31

Grant: Close

Exploration of Interior Structure and Formation Process of super-Earths with Cloud Microphysics

Open Date: 2018-04-25

Close Date: 2020-03-31

Articles (31)

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Collaborators (23)

Elspeth K H Lee

Research Group Leader

Max-Planck-Institut für Astronomie

GERMANY

Kazumasa Ohno

Research Interests

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About

Recent Grants

Articles (31)

Three-dimensional temporal evolution of photochemical hazes in exoplanet atmospheres: I. Description and test application to HD 189733b

The James Webb Space Telescope NIRSpec-PRISM Transmission Spectrum of the Super-puff, Kepler-51d

A Sulfur-rich Atmosphere for the Young Jupiter Analog AF Lep b Reveals Significant Solid Accretion

Radiatively Controlled Thermal Stability of High-altitude Clouds in Exoplanetary Atmospheres

Heavy element enrichment of gas in surface-accretion disks

A dichotomy of the mass–metallicity relation of exoplanetary atmospheres demarcated by their birthplace

The Compositions of the HR 8799 Planets Reflect Accretion of Both Solids and Metal-enriched Gas

Sulfur Enrichment in Close-in Exoplanet Atmospheres Induced by Pebble Drift across the Salt Line

Effects of Planetary Parameters on Disequilibrium Chemistry in Irradiated Planetary Atmospheres: From Gas Giants to Sub-Neptunes

A Panchromatic Characterization of the Evening and Morning Atmosphere of WASP-107 b: Composition and Cloud Variations, and Insight into the Effect of Stellar Contamination

A JWST Panchromatic Thermal Emission Spectrum of the Warm Neptune Archetype GJ 436b

A Possible Metal-dominated Atmosphere below the Thick Aerosols of GJ 1214 b Suggested by Its JWST Panchromatic Transmission Spectrum

Reassessing Sub-Neptune Structure, Radii, and Thermal Evolution

The HUSTLE Program: The UV to Near-IR Transmission Spectrum of the Hot Jupiter KELT-7b

Monosilane Worlds: Sub-Neptunes with Atmospheres Shaped by Reduced Magma Oceans

Cloud and haze parameterization in atmospheric retrievals: Insights from Titan's Cassini data and JWST observations of hot Jupiters

Three-dimensional dynamical evolution of cloud particle microphysics in sub-stellar atmospheres

Beyond monoculture: Polydisperse moment methods for sub-stellar atmosphere cloud microphysics: II. A three-moment gamma distribution formulation for GCM applications

Fractal Aggregate Aerosols in the Virga Cloud Code. I. Model Description and Application to a Benchmark Cloudy Exoplanet

Revising the Giant Planet Mass–Metallicity Relation: Deciphering the Formation Sequence of Giant Planets

Multiple Clues for Dayside Aerosols and Temperature Gradients in WASP-69 b from a Panchromatic JWST Emission Spectrum

A high internal heat flux and large core in a warm Neptune exoplanet

Photochemical Hazes in Exoplanetary Skies with Diamonds: Microphysical Modeling of Haze Composition Evolution via Chemical Vapor Deposition

Early Release Science of the exoplanet WASP-39b with JWST NIRCam

Early Release Science of the exoplanet WASP-39b with JWST NIRISS

Early Release Science of the exoplanet WASP-39b with JWST NIRSpec G395H

Early Release Science of the exoplanet WASP-39b with JWST NIRSpec PRISM

Methane throughout the atmosphere of the warm exoplanet WASP-80b

Stability and Detectability of Exomoons Orbiting HIP 41378 f, a Temperate Jovian Planet with an Anomalously Low Apparent Density

Nitrogen as a Tracer of Giant Planet Formation. II. Comprehensive Study of Nitrogen Photochemistry and Implications for Observing NH3 and HCN in Transmission and Emission Spectra

Nitrogen as a Tracer of Giant Planet Formation. I. A Universal Deep Adiabatic Profile and Semianalytical Predictions of Disequilibrium Ammonia Abundances in Warm Exoplanetary Atmospheres

Collaborators (23)

Elspeth K H Lee

Yuichi Ito

Hannah Wakeford

Quinn Konopacky

Katy Chubb

Ryan MacDonald

Satoshi Okuzumi

David Sing

Jeremy Leconte

Aurora Kesseli

Yuka Fujii

Eva-Maria Ahrer

Joseph Harrington

Adina D Feinstein

Luis Welbanks

Kevin Stevenson

Leonardo dos Santos

Zoe Leinhardt

Zachory Berta-Thompson

Ruth Murray-Clay

Matt Lodge

Thomas Beatty

Quentin Changeat

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