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SDSSJ1156-0207: A 0.54 M_sun + 0.19 M_sun Double-lined M Dwarf Eclipsing Binary System
Chien-Hsiu Lee
Eclipsing binaries are instrumental to our understanding of fundamental stellar parameters. With the arrival of ultra-wide cameras and large area photometric monitoring programs, n…
Evidence that the planetary candidate CVSO30c is a background star from optical, seeing-limited data
Chien-Hsiu Lee, Po-Shih Chiang
We report serendipitous optical imaging of CVSO30c, an exoplanet candidate associated with the pre-main sequence T Tauri star CVSO30 resides in the 25 Ori stellar cluster. We perfo…
Microlensing and its Degeneracy Breakers: Parallax, Finite Source, High-resolution Imaging, and Astrometry
Chien-Hsiu Lee
First proposed by Paczynski in 1986, microlensing has been instrumental in the search of compact dark matter as well as discovery and characterization of exoplanets. In this articl…
Magnification by Gravity
Chien-Hsiu Lee
Gravitational lensing time-delays using standard candles can provide tremendous leverage to cosmology. A recently discovered gravitationally lensed type Ia supernova, iPTF16geu, ma…
Identifying Rings in IFU Surveys
Chien-Hsiu Lee
Gravitational lensings provide unique opportunities to study distant galaxies. Despite their usefulness, only a dozens of gravitational arcs have been reported up-to-date, hampered…
SILVERRUSH. V. Census of Lya, [OIII]5007, Ha, and [CII]158um Line Emission with ~1000 LAEs at z=4.9-7.0 Revealed with Subaru/HSC
Yuichi Harikane, Masami Ouchi, Takatoshi Shibuya +23
We investigate Lya, [OIII]5007, Ha, and [CII]158um emission from 1124 galaxies at z=4.9-7.0. Our sample is composed of 1092 Lya emitters (LAEs) at z=4.9, 5.7, 6.6, and 7.0 identifi…
Kilonova from post-merger ejecta as an optical and near-infrared counterpart of GW170817
Masaomi Tanaka, Yousuke Utsumi, Paolo A. Mazzali +42
Recent detection of gravitational waves from a neutron star (NS) merger event GW170817 and identification of an electromagnetic counterpart provide a unique opportunity to study th…
J-GEM observations of an electromagnetic counterpart to the neutron star merger GW170817
Yousuke Utsumi, Masaomi Tanaka, Nozomu Tominaga +57
The first detected gravitational wave from a neutron star merger was GW170817. In this study, we present J-GEM follow-up observations of SSS17a, an electromagnetic counterpart of G…
Subaru Hyper Suprime-Cam Survey for An Optical Counterpart of GW170817
Nozomu Tominaga, Masaomi Tanaka, Tomoki Morokuma +31
We perform a -band survey for an optical counterpart of a binary neutron star coalescence GW170817 with Subaru/Hyper Suprime-Cam. Our untargeted transient search covers d…
GOLDRUSH. III. A Systematic Search of Protoclusters at Based on the Area
Jun Toshikawa, Hisakazu Uchiyama, Nobunari Kashikawa +15
We conduct a systematic search for galaxy protoclusters at based on the latest internal data release (S16A) of the Hyper SuprimeCam Subaru strategic program (HSC-SSP). I…
Accurate spectroscopic redshift of the multiply lensed quasar PSOJ0147 from the Pan-STARRS survey
Chien-Hsiu Lee
Context: The gravitational lensing time delay method provides a one-step determination of the Hubble constant (H0) with an uncertainty level on par with the cosmic distance ladder…
Extra-galactic distances with massive stars: the role of stellar variability in the case of M33
Chien-Hsiu Lee
In modern cosmology, determining the Hubble constant (H0) using distance ladder to percent level and comparing with the results from Planck satellite can shed light on the nature o…
SILVERRUSH. III. Deep Optical and Near-Infrared Spectroscopy for Lya and UV-Nebular Lines of Bright Lya Emitters at z=6-7
Takatoshi Shibuya, Masami Ouchi, Yuichi Harikane +23
We present Lya and UV-nebular emission line properties of bright Lya emitters (LAEs) at z=6-7 with a luminosity of log L_Lya/[erg s-1] = 43-44 identified in the 21-deg2 area of the…
Clustering of quasars in a wide luminosity range at redshift 4 with Subaru Hyper Suprime-Cam wide field imaging
Wanqiu He, Masayuki Akiyama, James Bosch +25
We examine the clustering of quasars over a wide luminosity range, by utilizing 901 quasars at with photometrically se…
The Quasar Luminosity Function at Redshift 4 with Hyper Suprime-Cam Wide Survey
Masayuki Akiyama, Wanqiu He, Hiroyuki Ikeda +24
We present the luminosity function of z=4 quasars based on the Hyper Suprime-Cam Subaru Strategic Program Wide layer imaging data in the g, r, i, z, and y bands covering 339.8 deg^…
SILVERRUSH. II. First Catalogs and Properties of ~2,000 Lya Emitters and Blobs at z~6-7 Identified over the 14-21 deg2 Sky
Takatoshi Shibuya, Masami Ouchi, Akira Konno +19
We present an unprecedentedly large catalog consisting of 2,230 > L* Lya emitters (LAEs) at z=5.7 and 6.6 on the 13.8 and 21.2 deg2 sky, respectively, that are identified by the SI…
Luminous Quasars Do Not Live in the Most Overdense Regions of Galaxies at z~4
Hisakazu Uchiyama, Jun Toshikawa, Nobunari Kashikawa +22
We present the cross-correlation between 151 luminous quasars () and 179 protocluster candidates at , extracted from the Wide imaging survey ($…
The Hyper Suprime-Cam SSP Survey: Overview and Survey Design
H. Aihara, N. Arimoto, R. Armstrong +139
Hyper Suprime-Cam (HSC) is a wide-field imaging camera on the prime focus of the 8.2m Subaru telescope on the summit of Maunakea in Hawaii. A team of scientists from Japan, Taiwan…
Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). II. Discovery of 32 Quasars and Luminous Galaxies at 5.7 < z < 6.8
Yoshiki Matsuoka, Masafusa Onoue, Nobunari Kashikawa +43
We present spectroscopic identification of 32 new quasars and luminous galaxies discovered at 5.7 < z < 6.8. This is the second in a series of papers presenting the results of the…
Survey of Gravitationally-lensed Objects in HSC Imaging (SuGOHI). I. Automatic search for galaxy-scale strong lenses
Alessandro Sonnenfeld, James H. H. Chan, Yiping Shu +12
The Hyper Suprime-Cam Subaru Strategic Program (HSC SSP) is an excellent survey for the search for strong lenses, thanks to its area, image quality and depth. We use three differen…
A Computer Vision Approach To Identify Einstein Rings And Arcs
Chien-Hsiu Lee
Einstein rings are rare gem of the strong lensing phenomena. Unlike doubly or quadruply lensed systems, the ring images can be used to probe the underlying lens gravitational poten…
Double-lined M dwarf eclipsing binaries from Catalina Sky Survey and LAMOST
Chien-Hsiu Lee, Chien-Cheng Lin
Eclipsing binaries provide a unique opportunity to determine fundamental stellar properties. In the era of wide-field cameras and all-sky imaging surveys, thousands of eclipsing bi…
A Double-lined M-dwarf Eclipsing Binary from CSSxSDSS
Chien-Hsiu Lee
Eclipsing binaries offer a unique opportunity to determine basic stellar properties. With the advent of wide-field camera and all-sky time-domain surveys, thousands of eclipsing bi…
Time-domain Studies of M31
Chien-Hsiu Lee
M31, our closest neighboring galaxy, is a stepping stone to studies of stellar evolution, star formation, galaxy evolution, and cosmology. However, due to the difficulties of perfo…