A luminous blue kilonova and an off-axis jet from a compact binary merger at z = 0.1341

Troja, E.; Ryan, Geoffrey; Piro, L.; Eerten, Hendrik van; Cenko, S. Bradley; Yoon, Yongmin; Lee, Seong-Kook; Im, Myungshin; Sakamoto, T.; Gatkine, Pradip; Kutyrev, A.; Veilleux, Sylvain

doi:10.1038/s41467-018-06558-7

Cited by 130 publications

(144 citation statements)

References 67 publications

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“…A further comparison of optical emission from short GRBs to the kilonova of GW170817 (compiled in Villar et al 2017) clearly demonstrates that for on-axis events, short GRB afterglows are likely to outshine their optical kilonovae at all epochs if the luminosity and evolution of GW170817 is representative of the population. However, the overlap between the kilonova of GW170817 and the low-luminosity end of the short GRB distribution, including the claimed kilonovae in the short GRBs 150101B and 160821B (Troja et al 2018b;Lamb et al 2019b;Troja et al 2019) leaves open the possibility that a small subset of short GRBs are discovered slightly off-axis and the optical emission is in fact dominated by the kilonova in these cases. Finally, Figure 5 shows that if GW170817 had not been in solar conjunction at ≈ 15 − 100 days, we would have been able to witness the rise of the optical afterglow starting at ≈ 20 days and potentially the intersection with the kilonova emission.…”

Section: Comparison To Short Grb Afterglowsmentioning

confidence: 99%

The Optical Afterglow of GW170817: An Off-axis Structured Jet and Deep Constraints on a Globular Cluster Origin

Fong

Blanchard

Alexander

et al. 2019

ApJL

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We present a revised and complete optical afterglow light curve of the binary neutron star merger GW170817, enabled by deep Hubble Space Telescope (HST) F606W observations at ≈584 days post-merger, which provide a robust optical template. The light curve spans ≈ 110 − 362 days, and is fully consistent with emission from a relativistic structured jet viewed off-axis, as previously indicated by radio and X-ray data. Combined with contemporaneous radio and X-ray observations, we find no spectral evolution, with a weighted average spectral index of β = −0.583 ± 0.013, demonstrating that no synchrotron break frequencies evolve between the radio and X-ray bands over these timescales. We find that an extrapolation of the post-peak temporal slope of GW170817 to the luminosities of cosmological short GRBs matches their observed jet break times, suggesting that their explosion properties are similar, and that the primary difference in GW170817 is viewing angle. Additionally, we place a deep limit on the luminosity and mass of an underlying globular cluster of L 6.7 × 10 3 L , or M 1.3 × 10 4 M , at least 4 standard deviations below the peak of the globular cluster mass function of the host galaxy, NGC4993. This limit provides a direct and strong constraint that GW170817 did not form and merge in a globular cluster. As highlighted here, HST (and soon JWST) enables critical observations of the optical emission from neutron star merger jets and outflows.

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Section: Comparison To Short Grb Afterglowsmentioning

confidence: 99%

The Optical Afterglow of GW170817: An Off-axis Structured Jet and Deep Constraints on a Globular Cluster Origin

Fong

Blanchard

Alexander

et al. 2019

ApJL

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“…This galaxy present a very high mass and a low star formation rates (Im et al 2017;Blanchard et al 2017;Hjorth et al 2017;Levan et al 2017;Pan et al 2017). The host galaxy of GRB150101B presented as a analogue of GRB170817A (Troja et al 2018) is also a vary massive galaxy. In the light of those information we chose to focus on the stellar mass for the selection of gravitational waves host galaxy candidates.…”

Section: Introductionmentioning

confidence: 98%

Optimizing gravitational waves follow-up using galaxies stellar mass

Ducoin

Corre

Leroy

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We present a new strategy to optimise the electromagnetic follow-up of gravitational wave triggers. This method is based on the widely used galaxy targeting approach where we add the stellar mass of galaxies in order to prioritise the more massive galaxies. We crossmatched the GLADE galaxy catalog with the AllWISE catalog up to 400Mpc with an efficiency of ∼93%, and derived stellar masses using a stellar-to-mass ratio using the WISE1 band luminosity. We developed a new grade to rank galaxies combining their 3D localisation probability associated to the gravitational wave event with the new stellar mass information. The efficiency of this new approach is illustrated with the GW170817 event, which shows that its host galaxy, NGC4993, is ranked at the first place using this new method. The catalog, named Mangrove, is publicly available and the ranking of galaxies is automatically provided through a dedicated web site for each gravitational wave event.

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“…host galaxy properties, etc.). Signatures of specific progenitor systems, like locations in their host galaxies (Bloom et al 2002;Fong et al 2010;Fong & Berger 2013;Lyman et al 2017), or coincident emission associated with a supernova (Galama et al 1998;Hjorth et al 2003;Woosley & Bloom 2006;Hjorth & Bloom 2012), kilonova (Metzger et al 2010;Tanvir et al 2013;Troja et al 2018), or the presence of gravitational wave emission (Abbott et al 2017) can potentially help distinguish among progenitor systems for both long and short GRBs. In addition, there are many correlations present among observed and fitted GRB variables (e.g.…”

Section: Introductionmentioning

confidence: 99%

The evolution of gamma-ray burst jet opening angle through cosmic time

Lloyd-Ronning

Hurtado

Aykutalp

et al. 2020

Monthly Notices of the Royal Astronomical Society

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Jet opening angles of long gamma-ray bursts (lGRBs) appear to evolve in cosmic time, with lGRBs at higher redshifts being on average more narrowly beamed than those at lower redshifts. We examine the nature of this anti-correlation in the context of collimation by the progenitor stellar envelope. First, we show that the data indicate a strong correlation between gamma-ray luminosity and jet opening angle, and suggest this is a natural selection effect -only the most luminous GRBs are able to successfully launch jets with large opening angles. Then, by considering progenitor properties expected to evolve through cosmic time, we show that denser stars lead to more collimated jets, and argue that the observed anti-correlation between opening angle and redshift can be accounted for if lGRB massive star progenitors at high redshifts have higher average density compared to those at lower redshifts. This may be viable for an evolving IMF, and under the assumption that average density scales directly with mass, this relationship is consistent with the form of the IMF characteristic mass evolution suggested in the literature. The jet angle-redshift anti-correlation may also be explained if the lGRB progenitor population is dominated by massive stars at high redshift, while lower redshift lGRBs allow for a greater diversity of progenitor systems. Overall, however, we find both the jet angle-redshift anti-correlation and jet angle-luminosity correlation are consistent with the conditions of jet launch through, and collimation by, the envelope of a massive star progenitor.In this paper, we consider how different progenitor systems connect to GRB observables over cosmic time. We are motivated by the results of Lloyd-Ronning et al. (2019b) who found that certain intrinsic long gamma-ray burst (lGRB) properties appear to evolve

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A luminous blue kilonova and an off-axis jet from a compact binary merger at z = 0.1341

Cited by 130 publications

References 67 publications

The Optical Afterglow of GW170817: An Off-axis Structured Jet and Deep Constraints on a Globular Cluster Origin

The Optical Afterglow of GW170817: An Off-axis Structured Jet and Deep Constraints on a Globular Cluster Origin

Optimizing gravitational waves follow-up using galaxies stellar mass

The evolution of gamma-ray burst jet opening angle through cosmic time

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