G4.8+6.2, a possible kilonova remnant?

Liu, Yu; Zou, Yuan‐Chuan; Jiang, Bin; Ma, Shuai-Bing; Liao, Bin

doi:10.1093/mnrasl/slz141

Cited by 6 publications

(10 citation statements)

References 43 publications

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“…The connection between G4.8+6.2 and the guest star AD 1163 was reported by Liu et al [44]. AD 1163 was recorded in a rather unique way concerning the occultation of a guest star by the Moon on a specific date.…”

Section: A Kilonova Remnantsmentioning

confidence: 58%

“…Hence, CCO found in this area may be association with G4.8+6.2. Unfortunately, X-ray emission from G4.8+6.2 was strongly contaminated by Kepler [44].…”

Section: B Isolated Neutron Starmentioning

confidence: 99%

“…remnants of kilonova explosions, KNR) in our Galaxy that contains a massive fast-rotating strongly magnetic NS. These physical properties make it an ideal directed search target for CWs [44].…”

mentioning

confidence: 99%

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Directed search for continuous gravitational waves from the possible kilonova remnant G4.8+6.2

Liu¹,

Zou²

2022

Preprint

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G4.8+6.2 was proposed as a possible kilonova remnant associated with the Korean guest star of AD 1163 in our Milky Way galaxy. Its age is about 860 years according to the historical record. If a neutron star was left in the center of G4.8+6.2, this young neutron star may radiate strong continuous gravitational waves, which could beat the indirect age-based upper limit with current LIGO sensitivity. In this work, we searched such continuous gravitational waves in the frequency band 20 − 1500 Hz. This search used two days of LIGO O3b data from the Hanford and Livingston detectors. While no signal was found, we placed upper limits on the gravitational wave strain. For comparison we also showed the latest results of all-sky searches obtained with various search pipelines. With upgrading of the LIGO detectors, it will provide the opportunity to see whether a black hole or a neutron star is harbored inside G4.8+6.2. I. INTRODUCTION

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Section: A Kilonova Remnantsmentioning

confidence: 58%

“…Hence, CCO found in this area may be association with G4.8+6.2. Unfortunately, X-ray emission from G4.8+6.2 was strongly contaminated by Kepler [44].…”

Section: B Isolated Neutron Starmentioning

confidence: 99%

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Directed search for continuous gravitational waves from the possible kilonova remnant G4.8+6.2

Liu¹,

Zou²

2022

Preprint

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“…The G4.8+6.2 associated with AD 1163 is one example, from the middle of Figure 11, that provides the requirement for the gamma-ray sensitivity needed to observe an NSM remnant with a known distance and age. The object is reported to be a young kilonova remnant with t ∼ 860 yr (Liu et al 2019). If it is an NSM remnant at d ∼ 10 kpc, then a sensitivity of 10 −8 and 10 −9 photons s −1 cm −2 is required to observe G4.8+6.2 in the hard X-ray and gamma-ray bands, respectively.…”

Section: Detectable Distance To Galactic Nsm Remnantsmentioning

confidence: 99%

Gamma-Ray Diagnostics of r-process Nucleosynthesis in the Remnants of Galactic Binary Neutron-star Mergers

Terada

Miwa

Ohsumi

et al. 2022

ApJ

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We perform a full nuclear-network numerical calculation of the r-process nuclei in binary neutron-star mergers (NSMs), with the aim of estimating gamma-ray emissions from the remnants of Galactic NSMs up to 106 yr old. The nucleosynthesis calculation of 4070 nuclei is adopted to provide the elemental composition ratios of nuclei with an electron fraction Y e between 0.10 and 0.45. The decay processes of 3237 unstable nuclei are simulated to extract the gamma-ray spectra. As a result, the NSMs have different spectral colors in the gamma-ray band from various other astronomical objects at less than 105 yr old. In addition, we propose a new line diagnostic method for Y e that uses the line ratios of either 137mBa/85K or 243Am/60mCo, which become larger than unity for young and old r-process sites, respectively, with a low-Y e environment. From an estimation of the distance limit for gamma-ray observations as a function of age, the high sensitivity in the sub-megaelectronvolt band, at approximately 10−9 photons s−1 cm−2 or 10−15 erg s−1 cm−2, is required to cover all the NSM remnants in our Galaxy, if we assume that the population of NSMs by Wu et al. A gamma-ray survey with sensitivities of 10−8–10−7 photons s−1 cm−2 or 10−14–10−13 erg s−1 cm−2 in the 70–4000 keV band is expected to find emissions from at least one NSM remnant under the assumption of an NSM rate of 30 Myr−1. The feasibility of gamma-ray missions observing Galactic NSMs is also studied.

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“…A guest star is a historical term for an astrophysical object that suddenly appears and hence is likely associated with a transient event such as a supernova (SN) or a nova (e.g., Stephenson & Green 2009). East Asian history books are rich in astronomical records and scrutinizing them helped in the investigation of SNRs and novae (e.g., Liu et al 2019; Miszalski et al 2016; Patterson et al 2013; Ruiz‐Lapuente 2004). Accordingly, efforts have been made to create and refine catalogues of guest stars (e.g., Chu 1968; Clark & Stephenson 1977; Ho 1962; Stephenson & Green 2009; Xi et al 1966; Yau 1988) and to identify their possible counterparts (e.g., Chin & Huang 1994; Göttgens et al 2019; Liu et al 2019; Stephenson & Yau 1987).…”

Section: Introductionmentioning

confidence: 99%

A list of guest‐star records in Korean history and their possible counterparts

Park

Jeon

2022

Astron Nachr

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We report on guest-star events recorded in Korean history in the period between A.D. 154 and 1807. We search five books, namely Joseonwangjosillok, Seungjeongwonilgi, Jeungbomoonheonbigo, Goryeosa, and Samguksagi for "guest star" and find 37 events. Seventeen of the guest stars are almost certainly comets as identified previously and are not astrophysical transient events of our interest; we list them for completeness but do not discuss them in detail. We review the historical recordings and the previous interpretations of the guest-star events and scrutinize them in order to better identify the guest stars. We infer the positions of 11 events and compare them to astrophysical objects in up-to-date catalogues of possible remnants of transient events: supernova remnants, pulsars, magnetars, novae, and cataclysmic variables. We consider the positions and visibility of the astrophysical events, select possible counterparts, and present a list of them for the guest stars with an inferred position.

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G4.8+6.2, a possible kilonova remnant?

Cited by 6 publications

References 43 publications

Directed search for continuous gravitational waves from the possible kilonova remnant G4.8+6.2

Directed search for continuous gravitational waves from the possible kilonova remnant G4.8+6.2

Gamma-Ray Diagnostics of r-process Nucleosynthesis in the Remnants of Galactic Binary Neutron-star Mergers

A list of guest‐star records in Korean history and their possible counterparts

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