Ji-an Jiang

University of Science and Technology of China

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Masaomi Tanaka

Tohoku University

Nozomu Tominaga

National Astronomical Observatory of Japan

Keiichi Maeda

Kyoto University

Tomoki Morokuma

The University of Tokyo

Naoki Yasuda

Kavli Institute for the Physics and Mathematics of the Universe

Takashi J. Moriya

National Astronomical Observatory of Japan

N. Suzuki

Laboratoire de Physique Nucléaire et de Hautes Énergies

Lei Hu

Purple Mountain Observatory

Yongquan Xue

University of Science and Technology of China

Tinggui Wang

University of Science and Technology of China

Cooperative Institutions

Chinese Academy of Sciences

167

University of Science and Technology of China

104

University of Chinese Academy of Sciences

Purple Mountain Observatory

The University of Tokyo

National Astronomical Observatory of Japan

National Astronomical Observatories

Kyoto University

Institute of Modern Physics

Nanjing University

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A repeating FRB in a dense environment with a compact persistent radio source

arXiv (Cornell University) (2021)

Chenhui Niu K.K. Aggarwal Di Li X. Zhang Shami Chatterjee

Fast radio bursts (FRBs) are the most energetic radio transients in the Universe, the central engines of which remain unknown and could be diverse. The dispersion sweeps of FRBs provide a unique probe of the ionized baryon content of the intergalactic medium as well as FRBs natal environments. Here we report the discovery and localization of a new active repeater, FRB 190520B, which is co-located with a compact, persistent radio source (PRS) and identified with a dwarf host galaxy of high specific star formation rate at a redshift $z=0.241$. The estimated host galaxy dispersion measure (DM) $\rm DM_{\rm host} \approx 902^{+88}_{-128}$~pc~cm$^{-3}$ is nearly an order of magnitude higher than the average of FRB host galaxies and much larger than those of the intergalactic medium, suggesting caution in inferring redshifts for FRBs without accurate host galaxy identifications. This represents the second source after FRB 121102 with a confirmed association between a FRB and a compact PRS. The dense, complex host galaxy environment and the associated persistent radio source may point to a distinctive origin or an earlier evolutionary stage for active repeating FRBs.

Fast radio burst

Source counts

X-shaped radio galaxy

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Citations (4)

DESIRT Transient Discovery Report for 2021-04-12

Transient Name Server Discovery Report (2021)

X. Chen Lei Hu H. J. Yang Jun Tao L. Wang

Transient (computer programming)

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The unluckiest star: A spectroscopically confirmed repeated partial tidal disruption event AT 2022dbl

arXiv (Cornell University) (2024)

Zheyu Lin Ning Jiang Tinggui Wang Xu Kong Dongyue Li

The unluckiest star orbits a supermassive black hole elliptically. Every time it reaches the pericenter, it shallowly enters the tidal radius and gets partially tidal disrupted, producing a series of flares. Confirmation of a repeated partial tidal disruption event (pTDE) requires not only evidence to rule out other types of transients, but also proof that only one star is involved, as TDEs from multiple stars can also produce similar flares. In this letter, we report the discovery of a repeated pTDE, AT 2022dbl. In a quiescent galaxy at z=0.0284, two separate optical/UV flares have been observed in 2022 and 2024, with no bright X-ray, radio or mid-infrared counterparts. Compared to the first flare, the second flare has a similar blackbody temperature of ~26,000 K, slightly lower peak luminosity, and slower rise and fall phases. Compared to the ZTF TDEs, their blackbody parameters, bolometric energies and light curve shapes are all similar. The spectra taken during the second flare show a steeper continuum than the late-time spectra of the previous flare, consistent with a newly risen flare. More importantly, the possibility of two independent TDEs can be largely ruled out because the optical spectra taken around the peak of the two flares exhibit highly similar broad Balmer, N III and possible He II emission lines, especially the extreme ~4100{\AA} emission lines. This represents the first robust spectroscopic evidence for a repeated pTDE, which can soon be verified by observing the third flare, given its short orbital period.

Star (game theory)

10.48550/arxiv.2405.10895

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Theoretical Study on the Dual-wavelength Second Harmonic Generation with Transverse Gradient Nested Optical Superlattice

Journal of Physics Conference Series (2017)

Xuan Xiao Ji-an Jiang Yunqing Lu Jiandong Zhang Kai Wang

Dual-wavelength second harmonic generation with transverse gradient nested optical superlattice is investigated. The ratio of SHG of two fundamental wavelengths can be controlled by adjusting the position of incident light. This study shows that the efficiency of SHG is related to the temperature and coherent length of the nested structure.

Position (finance)

Harmonic

10.1088/1742-6596/844/1/012029

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DESIRT Transient Discovery Report for 2021-03-31

Transient Name Server Discovery Report (2021)

X. Chen Lei Hu H. J. Yang Jun Tao L. Wang

Transient (computer programming)

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A deep analysis for New Horizons’ KBO search images

Publications of the Astronomical Society of Japan (2024)

Fumi Yoshida Toshifumi Yanagisawa Takashi Itô Hirohisa Kurosaki Makoto Yoshikawa

Abstract Observation datasets acquired by the Hyper Suprime-Cam (HSC) on the Subaru Telescope for NASA’s New Horizons mission target search were analyzed through a method devised by JAXA. The method makes use of Field Programmable Gate arrays and was originally used to detect fast-moving objects such as space debris or near-Earth asteroids. Here we present an application of the method to detect slow-moving Kuiper Belt Objects (KBOs) in the New Horizons target search observations. A cadence that takes continuous images of one HSC field of view for half a night fits the method well. The observations for the New Horizons Kuiper Belt Extended Mission (NH/KEM) using HSC began in 2020 May, and are ongoing. Here we show our result of the analysis of the dataset acquired from 2020 May through 2021 June that have already passed the proprietary period and are open to the public. We detected 84 KBO candidates in the 2020 June and 2021 June datasets, when the observation field was close to opposition.

New horizons

Opposition (politics)

10.1093/pasj/psae043

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Citations (2)

Broadband mid-IR difference-frequency generation in 5 mol % MgO-doped periodically and aperiodically poled lithium niobate

Quantum Electronics (2018)

Jiandong Zhang Ji-an Jiang Kai Wang Xuan Xiao Siyao Yu

We have theoretically investigated broadband mid-infrared (mid-IR) difference-frequency generation (DFG) in 5 mol % MgO-doped periodically poled lithium niobate (5 mol % MgO : PPLN) based on quasi-phase-matching (QPM) with group-velocity matching (GVM) between the pump and the idler for the eee interaction of QPM. The acceptance bandwidths are 282.3 nm and 35.4 nm around 3.4 μm with the signal and pump wavelengths fixed at 1.550 μm and 1.064 μm, and the required QPM periods are 30.26 μm and 30.25 μm, respectively. A method which can broaden the flattop QPM DFG acceptance bandwidth (ABW) around the GVM wavelength for the idler wavelength in 5 mol % MgO-doped aperiodically poled lithium niobate (5 mol % MgO : APPLN) is proposed. The structure of 5 mol % MgO : APPLN is optimised using a genetic algorithm by adjusting its parameters. The simulation results show that under the GVM conditions, the maximum ABW for the idler is 1045.9 nm and 96.6 nm at a fixed signal wavelength of 1.550 μm and at a fixed pump wavelength of 1.064 μm, respectively. The tradeoff between the reduced effective nonlinear coefficient and DFG ABW is discussed.

10.1070/qel16475

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Calcium-rich Transient SN 2019ehk in a Star-forming Environment: Yet Another Candidate for a Precursor of a Double Neutron-star Binary

The Astrophysical Journal (2021)

Tatsuya Nakaoka Keiichi Maeda M. Yamanaka Masaomi Tanaka Miho Kawabata

Abstract We present optical and near-infrared observations of SN 2019ehk, which was initially reported as a Type Ib supernova (SN). We show that it evolved to a Ca-rich transient according to its spectral properties and evolution in late phases. However, it shows a few properties distinct from those of the canonical Ca-rich transients: a short-duration first peak in the light curve, high peak luminosity, and association with a star-forming environment. Indeed, some of these features are shared with iPTF14gqr and iPTF16hgs, which are candidates for a special class of core-collapse SNe: the so-called ultra-stripped envelope SNe, i.e., a relatively low-mass He (or C+O) star explosion in a binary as a precursor of short-period double neutron star (NS) binaries. The estimated ejecta mass (0.4 M ⊙ ) and explosion energy (1.7 × 10 50 erg) are consistent with this scenario. The analysis of the first peak suggests the existence of dense circumstellar material in the vicinity of the progenitor, implying a CCSN origin. Based on this analysis, we suggest SN 2019ehk is another candidate for a low-mass He star explosion. It might create a double NS binary, but with a wide separation. These candidates for low-mass stripped envelope SNe, including ultra-stripped envelope SN candidates, seem to form a subpopulation among Ca-rich transients, associated with young population. We propose that the key to distinguishing this population is the early first peak in their light curves.

Common envelope

Star (game theory)

Low Mass

10.3847/1538-4357/abe765

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Citations (4)

KISS: Discovery and Spectroscopic Classification of a Type Ia Supernova KISS15q

ATel (2015)

Tomoki Morokuma Nozomu Tominaga Masaomi Tanaka Ji-an Jiang Takumi Shibata

KISS (TNC)

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