GW170817 Most Likely Made a Black Hole

@article{Pooley2018GW170817ML,
title={GW170817 Most Likely Made a Black Hole},
author={David Pooley and Pawan Kumar and J. Craig Wheeler and Bruce Grossan},
journal={The Astrophysical Journal},
year={2018}
}
There are two outstanding issues regarding the neutron-star merger event GW170817: the nature of the compact remnant and the interstellar shock. The mass of the remnant of GW170817, ~2.7 , implies that the remnant could be either a massive rotating neutron star, or a black hole. We report Chandra Director's Discretionary Time observations made in 2017 December and 2018 January, and we reanalyze earlier observations from 2017 August and 2017 September, in order to address these unresolved issues…

Figures and Tables from this paper

Chandra X-ray Observations of the Neutron Star Merger GW170817: Thermal X-Ray Emission From a Kilonova Remnant?
• Physics
• 2018
The recent discovery of the neutron star merger and multi-messenger event GW170817 (also known as kilonova GRB170817A) provides an unprecedented laboratory in which to study these mysterious objects,
Diagnosing the remnants of binary neutron star merger from GW170817/GRB170817A event
• Physics
Monthly Notices of the Royal Astronomical Society
• 2019
The event GW170817/GRB 170817A, discovered via the successful joint observation of its gravitational wave radiation and its multi-wavelength electromagnetic counterparts, was the first definite
A long-lived neutron star merger remnant in GW170817: constraints and clues from X-ray observations
• L. Piro, +12 authors T. Sakamoto
• Physics
Monthly Notices of the Royal Astronomical Society
• 2018
Multi-messenger observations of GW170817 have not conclusively established whether the merger remnant is a black hole (BH) or a neutron star (NS). We show that a long-lived magnetized NS with a
Search for Gravitational Waves from a Long-lived Remnant of the Binary Neutron Star Merger GW170817
One unanswered question about the binary neutron star coalescence GW170817 is the nature of its post-merger remnant. A previous search for post-merger gravitational waves targeted high-frequency
A Decline in the X-Ray through Radio Emission from GW170817 Continues to Support an Off-axis Structured Jet
We present new observations of the binary neutron star merger GW170817 at $\Delta t\approx 220-290$ days post-merger, at radio (Karl G. Jansky Very Large Array; VLA), X-ray (Chandra X-ray
A lesson from GW170817: most neutron star mergers result in tightly collimated successful GRB jets
• Physics
Monthly Notices of the Royal Astronomical Society
• 2018
The joint detection of gravitational waves (GWs) and $\gamma$-rays from a binary neutron-star (NS) merger provided a unique view of off-axis GRBs and an independent measurement of the NS merger rate.
Kilonovae
• B. Metzger
• Physics, Medicine
Living reviews in relativity
• 2017
The history and physics of Kilonovae are reviewed, leading to the current paradigm of week-long emission with a spectral peak at near-infrared wavelengths, and the prospects of kilonova detection following future GW detections of NS–NS/BH–NS mergers are assessed.
The Binary Neutron Star Event LIGO/Virgo GW170817 160 Days after Merger: Synchrotron Emission across the Electromagnetic Spectrum
We report deep Chandra, HST and VLA observations of the binary neutron star event GW170817 at $t<160$ d after merger. These observations show that GW170817 has been steadily brightening with time and
Kilonovae
• B. Metzger
• Physics, Medicine
Living reviews in relativity
• 2020
Joint GW and kilonova observations of GW170817 and future events provide a new avenue to constrain the astrophysical origin of the r-process elements and the equation of state of dense nuclear matter.
Brightening X-Ray/Optical/Radio Emission of GW170817/SGRB 170817A: Evidence for an Electron-Positron Wind from the Central Engine?
Recent follow-up observations of the binary neutron star (NS) merging event GW170817/SGRB 170817A reveal that its X-ray/optical/radio emissions are brightening continuously up to $\sim 100$ days

References

SHOWING 1-10 OF 34 REFERENCES
A Deep Chandra X-ray Study of Neutron Star Coalescence GW170817
We report Chandra observations of GW170817, the first neutron star-neutron star merger discovered by the joint LIGO-Virgo Collaboration, and the first direct detection of gravitational radiation
Multi-messenger Observations of a Binary Neutron Star Merger
• R. Poggiani
• Physics
Proceedings of Frontier Research in Astrophysics – III — PoS(FRAPWS2018)
• 2019
On 2017 August 17 the Advanced LIGO and Advanced Virgo detectors observed the merger of a binary neutron star system. The Fermi-GBM and INTEGRAL SPI-ACS instruments indepen- dently detected the
A mildly relativistic wide-angle outflow in the neutron-star merger event GW170817
The cocoon model explains the radio light curve of GW170817, as well as the γ-ray and X-ray emission (and possibly also the ultraviolet and optical emission), and is the model that is most consistent with the observational data.
The X-ray counterpart to the gravitational-wave event GW170817
The detection of X-ray emission at a location coincident with the kilonova transient provides the missing observational link between short γ-ray bursts and gravitational waves from neutron-star mergers, and gives independent confirmation of the collimated nature of the γ,ray-burst emission.
GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral.
The association of GRB 170817A, detected by Fermi-GBM 1.7 s after the coalescence, corroborates the hypothesis of a neutron star merger and provides the first direct evidence of a link between these mergers and short γ-ray bursts.
Brightening X-Ray Emission from GW170817/GRB 170817A: Further Evidence for an Outflow
• Physics
• 2018
The origin of the X-ray emission from neutron star coalescence GW170817/GRB 170817A is a key diagnostic of the unsettled post-merger narrative, and different scenarios predict distinct evolution in
The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. V. Rising X-Ray Emission from an Off-axis Jet
We report the discovery of rising X-ray emission from the binary neutron star (BNS) merger event GW170817. This is the first detection of X-ray emission from a gravitational-wave source. Observations
Optical and X-ray emission from stable millisecond magnetars formed from the merger of binary neutron stars
• Physics
• 2014
The coalescence of binary neutron stars (NSs) may in some cases produce a stable massive NS remnant rather than a black hole. Due to the substantial angular momentum from the binary, such a remnant
Illuminating gravitational waves: A concordant picture of photons from a neutron star merger
It is demonstrated that merging neutron stars are a long-sought production site forging heavy elements by r-process nucleosynthesis, which is dissimilar to classical short gamma-ray bursts with ultrarelativistic jets.
Swope Supernova Survey 2017a (SSS17a), the optical counterpart to a gravitational wave source
A rapid astronomical search located the optical counterpart of the neutron star merger GW170817 and shows how these observations can be explained by an explosion known as a kilonova, which produces large quantities of heavy elements in nuclear reactions.