203 citations · 632 across the 14 of their papers we have counts for
12 papers · 1 filter
Massive stars exploding in a He-rich circumstellar medium. I. Type Ibn (SN 2006jc-like) events
A. Pastorello, S. Mattila, L. Zampieri +26
We present new spectroscopic and photometric data of the type Ibn supernovae 2006jc, 2000er and 2002ao. We discuss the general properties of this recently proposed supernova family…
Variable Star Network: World Center for Transient Object Astronomy and Variable Stars
T. Kato, M. Uemura, R. Ishioka +4
Variable Star Network (VSNET, http://www.kusastro.kyoto-u.ac.jp/vsnet/) is a global professional-amateur network of researchers in variable stars and related objects, particularly…
Very high column density and small reddening towards GRB 020124 at z = 3.20
J. Hjorth, P. Møller, J. Gorosabel +27
We present optical and near-infrared observations of the dim afterglow of GRB 020124, obtained between 2 and 68 hours after the gamma-ray burst. The burst occurred in a very faint…
Superhumps in the Rarely Outbursting SU UMa-Type Dwarf Nova, HO Delphini
T. Kato, D. Nogami, M. Moilanen +1
We observed the 1994, 1996 and 2001 outbursts of HO Del. From the detection of secure superhumps, HO Del is confirmed to be an SU UMa-type dwarf nova with a superhump period of 0.0…
Photometric study of new southern SU UMa-type dwarf novae - II: Authentication of BF Ara as a Normal SU UMa-type Dwarf Nova with the Shortest Supercycle
T. Kato, G. Bolt, P. Nelson +5
We photometrically observed the 2002 August long outburst of BF Ara. The observation for the first time unambiguously detected superhumps (average period 0.08797(1) d), qualifying…
V463 Scuti (Nova Sct 2000): Rapidly Evolving Nova with a Prominent Premaximum Halt
T. Kato, M. Uemura, K. Haseda +3
We summarize photometric and spectroscopic observations of V463 Sct (Nova Sct 2000), which was originally thought to be a red variable. The spectrum taken on 2000 March 16.81 UT sh…
The Nature of V359 Centauri Revealed: New Long-Period SU UMa-Type Dwarf Nova
T. Kato, R. Stubbings, P. Nelson +12
We detected four outbursts of V359 Cen (possible nova discovered in 1939) between 1999 and 2002. Time-resolved CCD photometry during two outbursts (1999 and 2002) revealed that V35…
Deep Transient Optical Fading in the WC9 Star WR 106
T. Kato, K. Haseda, K. Takamizawa +1
We discovered that the WR9-type star WR 106 (HDE 313643) underwent a deep episodic fading in 2000. The depth of the fading (dV ~ 2.9 mag) surpassed those of all known similar "ecli…
Discovery of Extremely Large-Amplitude Quasi-Periodic Photometric Variability in WC9-Type Wolf-Rayet Binary, WR 104
T. Kato, K. Haseda, H. Yamaoka +1
We discovered that the Wolf-Rayet (WR)+OB star binary, WR 104, renowned for its associated "dusty pinwheel nebula" recently spatially resolved with infrared interferometry, exhibit…
Recurrent Nova IM Normae
T. Kato, H. Yamaoka, W. Liller +1
We detected the second historical outburst of the 1920 nova IM Nor. Accurate astrometry of the outbursting object revealed the true quiescent counterpart having a magnitude of R=17…
Discovery of a Dwarf Nova Breaking the Standard Sequence of Compact Binary Evolution
M. Uemura, T. Kato, R. Ishioka +1
We revealed that the dwarf nova 1RXS J232953.9+062814 is an SU UMa-type system with a superhump period of 66.774+/-0.010 min. The short period strongly indicates that the orbital p…
Discovery and Photometric Observation of the Optical Counterpart in a Possible Galactic Halo X-ray Transient, XTE J1118+480
M. Uemura, T. Kato, K. Matsumoto +7
We discovered the optical counterpart about 13 mag of a soft X-ray transient, XTE J1118+480 on 2000 March 30. We perform astrometry and provide the accurate position as R.A. = 11h1…