89 citations · 175 across the 7 of their papers we have counts for
16 papers
A Greedy and Optimistic Approach to Clustering with a Specified Uncertainty of Covariates
Akifumi Okuno, Kohei Hattori
In this study, we examine a clustering problem in which the covariates of each individual element in a dataset are associated with an uncertainty specific to that element. More spe…
Dippers from TESS Full-frame Images. II. Spectroscopic Characterization of Four Young Dippers
Yui Kasagi, Takayuki Kotani, Hajime Kawahara +9
Photometric monitoring by the Transiting Exoplanet Survey Satellite (TESS) has discovered not only periodic signals by transiting exoplanets but also episodic or quasi-periodic dim…
A Very Metal-poor RR Lyrae Star with a Disk Orbit Found in the Solar Neighborhood
Noriyuki Matsunaga, Akinori Itane, Kohei Hattori +28
Metal-deficient stars are important tracers for understanding the early formation of the Galaxy. Recent large-scale surveys with both photometric and spectroscopic data have report…
Action-based distribution function modelling for constraining the shape of the Galactic dark matter halo
Kohei Hattori, Monica Valluri, Eugene Vasiliev
We estimate the 3D density profile of the Galactic dark matter (DM) halo within kpc from the Galactic centre by using the astrometric data for halo RR Lyrae stars f…
591 high velocity stars in the Galactic halo selected from LAMOST DR7 and Gaia DR2
Yin-Bi Li, A-Li Luo, You-Jun Lu +14
In this paper, we report 591 high velocity star candidates (HiVelSCs) selected from over 10 million spectra of the data release seven (DR7) of the Large Sky Area Multi-object Fiber…
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…