54 citations · 136 across the 7 of their papers we have counts for
8 papers
New assignments of the CaH transitions in the sunspot umbral spectrum and effective temperature estimation using molecular lines
Kosei Usami, Kaori Kobayashi, Hiroyuki Maehara
High-resolution spectroscopy observations of sunspots offer a unique natural laboratory for detailed molecular spectroscopy. Calcium monohydride (CaH) is a vital spectroscopic trac…
Discovery of a compact hierarchical triple main-sequence star system while searching for binary stars with compact objects
Ataru Tanikawa, Akito Tajitsu, Satoshi Honda +5
We have discovered a compact hierarchical triple main-sequence star system, which is cataloged as Gaia DR3 1010268155897156864 or TIC 21502513. Hereafter, we call it ``G1010''. G10…
Time evolution of white-light flare accompanied by probable postflare loops on M-type dwarf EV Lacertae
Shinnosuke Ichihara, Daisaku Nogami, Kosuke Namekata +6
White-light flares are explosive phenomena accompanied by brightening of continuum from near-ultraviolet to optical, which occur on the Sun and stars. In order to investigate the m…
Optical Observations of the High Mass X-ray Binary MAXI J0709159/LY CMa
Megumi Shidatsu, Nobuyuki Kawai, Hiroyuki Maehara +12
We report on the optical spectroscopic monitoring of the X-ray transient MAXI J0709159 (identified as the Be star LY CMa) performed for about 1.5 months after the X-ray detectio…
MASTER OT J030227.28+191754.5: an unprecedentedly energetic dwarf nova outburst
Yusuke Tampo, Taichi Kato, Keisuke Isogai +60
We present a detailed study of the MASTER OT J030227.28+191754.5 outburst in 2021-2022, reaching an amplitude of 10.2 mag and a duration of 60 d. The detections of (1) the double-p…
Kojima-1Lb Is a Mildly Cold Neptune around the Brightest Microlensing Host Star
A. Fukui, D. Suzuki, N. Koshimoto +56
We report the analysis of additional multiband photometry and spectroscopy and new adaptive optics (AO) imaging of the nearby planetary microlensing event TCP J05074264+2447555 (Ko…
A remarkable recurrent nova in M31: Discovery and optical/UV observations of the predicted 2014 eruption
M. J. Darnley, M. Henze, I. A. Steele +20
The Andromeda Galaxy recurrent nova M31N 2008-12a had been caught in eruption eight times. The inter-eruption period of M31N 2008-12a is ~1 year, making it the most rapidly recurri…
The Hydrogen Burning Turn-off of RS Ophiuchi 2006
Izumi Hachisu, Mariko Kato, Seiichiro Kiyota +11
We report a coordinated multi-band photometry of the RS Oph 2006 outburst and highlight the emission line free y-band photometry that shows a mid-plateau phase at y ~ 10.2 mag from…