277 citations · 3k across the 69 of their papers we have counts for
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Dippers from the TESS Full-Frame Images I: The Results of the first 1 year data and Discovery of A Runaway dipper
Tomoyuki Tajiri, Hajime Kawahara, Masataka Aizawa +9
We present a comprehensive catalog of the dippers---young stellar objects that exhibit episodic dimming---derived from the one year's worth of data of Transiting Exoplanet Survey S…
Bayesian Dynamic Mapping of an Exo-Earth from Photometric Variability
Hajime Kawahara, Kento Masuda
Photometric variability of a directly imaged exo-Earth conveys spatial information on its surface and can be used to retrieve a two-dimensional geography and axial tilt of the plan…
Detection of Fe\,{\sc i} Emission in the Day-side Spectrum of WASP-33b
Stevanus K. Nugroho, Neale P. Gibson, Ernst J. W. de Mooij +4
We analyze the high-resolution emission spectrum of WASP-33b taken using the High Dispersion Spectrograph (R\,\,165,000) on the 8.2-m Subaru telescope. The data cover \…
Obliquity of an Earth-like planet from frequency modulation of its direct imaged lightcurve: mock analysis from general circulation model simulation
Yuta Nakagawa, Takanori Kodama, Masaki Ishiwatari +8
Direct-imaging techniques of exoplanets have made significant progress recently, and will eventually enable to monitor photometric and spectroscopic signals of earth-like habitable…
Global Mapping of an Exo-Earth using Sparse Modeling
Masataka Aizawa, Hajime Kawahara, Siteng Fan
We develop a new retrieval scheme for obtaining two-dimensional surface maps of exoplanets from scattered light curves. In our scheme, the combination of the L1-norm and Total Squa…
Global Mapping of the Surface Composition on an Exo-Earth using Color Variability
Hajime Kawahara
Photometric variation of a directly imaged planet contains information on both the geography and spectra of the planetary surface. We propose a novel technique that disentangles th…