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portfolio
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projects
project 1
One of my projects.
publications
Water-cooled (sub)-Neptunes get better gas mileage
Published:
In this work my colleague Tatsuya and I use a self-consistent hydrodynamic-radiative-chemical model of atmospheric outflow to show that sub-Neptunes with water vapor in their upper atmospheres can retain their envelopes against stellar radiation-driven escape. Since the water-vapor in the atmosphere is sensitive to the planet’s equilibrium temperature through the Clausius-Claperyon relation, this creates an ``oasis” for sub-Neptunes at intermediate distances and explains a puzzling feature of the demographics of kepler sub-Neptunes around M dwarfs. It also predicts that water-poor systems like those seen around M dwarfs will host fewer sub-Neptunes relative to rocky super-Earths, in accord with available observations.
Citation: Yoshida, T. and Gaidos, E. (2025) Astronomy & Astrophysics 696, L13.
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Mass, Gas, and Gauss around a T Tauri Star with SPIRou
Published:
At the time of this project, IRAS04125+2092b was the youngest known transiting planet. It orbits a 3 Myr-old, low-mass member of the Taurus Molecular Cloud that also hosts disk with a large central cavity. The planet is nearly the size of Jupiter and could either be a bona fide Jovian planet or low-mass planet with a highly inflated envelope of hydrogen and helium, i.e. an ancestor to the population of sub-Neptunes seen around middle-aged stars. Mu colleague Jean-François and I, with the help of members of the SPIRou team, used the SPIRou infrared spectropolarimeter on the CFHT telescope on Maunakea to constrain the mass of the object and study the star’s magnetic field. Serendipitously, we discovered that a wind from a highly-inclined, gas disk that could be interacting with the planet.
Citation: Donati, J.-F., Gaidos, E. et al. (2025). Astronomy & Astrophysics 698, L14.
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talks
Talk 1 on Relevant Topic in Your Field
Published:
This is a description of your talk, which is a markdown file that can be all markdown-ified like any other post. Yay markdown!
Conference Proceeding talk 3 on Relevant Topic in Your Field
Published:
This is a description of your conference proceedings talk, note the different field in type. You can put anything in this field.
teaching
ERTH/ASTR 707: Exoplanet Astronomy
Graduate Course, , 1900
Three decades ago, the only planetary system we were certain of was our own. Now we know of thousands of systems; their diversity challenges our theories of planet formation and evolution, provides required context for understanding the Solar System, and is the foundation upon which rigorous searches for habitats and life elsewhere in the Universe will be built. This course exposes students to the present state of knowledge of planetary systems using representative data at the field’s leading edge, introduce key theoretical concepts and analytic and numerical tools with broad application, and develops teamwork, presentation, and publishing skills.
ERTH 110: Voyage of the Vicariance: Earth and Life through Time
Undergraduate Course, , 1900
Exploration of Earth history via an imaginary sailing voyage around the world and back in time to Earth’s formation and the origin of life. Introduces fundamental concepts in geology, paleontology, living systems, and evolutionary biology.