Lateral spreading effects on VLBI radio images of neutron star merger jets

Fernandez, J.; Kobayashi, S.; Lamb, Gavin P.

doi:10.48550/arxiv.2101.05138

Cited by 3 publications

(4 citation statements)

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“…This resultant jet structure can be used as the fiducial energy and Lorentz factor profiles for structured jet afterglow models, such as those used to model the late time afterglow to GRB 170817A (e.g. Lyman et al 2018;Troja et al 2018Troja et al , 2019Lamb & Kobayashi 2018;Lamb et al 2019;Resmi et al 2018;Ryan et al 2020;Salafia et al 2019;Fernández et al 2021).…”

Section: Application To the Gw170817/grb 170817a Afterglowmentioning

confidence: 99%

Are Interactions with Neutron Star Merger Winds Shaping the Jets?

Nativi,

Lamb,

Rosswog

et al. 2021

Preprint

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Jets can become collimated as they propagate through dense environments and understanding such interactions is crucial for linking physical models of the environments to observations. In this work, we use 3D special-relativistic simulations to study how jets propagate through the environment created around a neutron star merger remnant by neutrino-driven winds. We simulate four jets with two different initial structures, top-hat and Gaussian, and two luminosities. After jet breakout, we study the angular jet structures and the resulting afterglow light curves. We find that the initial angular structures are efficiently washed out during the propagation, despite the small wind mass of only ∼ 10 −3 M . The final structures depend, however, on the jet luminosity, as less energetic jets are more strongly collimated. Although entrainment of baryons leads to only moderate outflow Lorentz factors (≈ 40), all simulated jets can well reproduce the afterglow observed in the aftermath of GW170817. The inferred physical parameters (e.g. inclination angle, ambient particle number density), however, vary substantially between the fits and appear to be sensitive to smaller details of the angular jet shape, indicating that observationally inferred parameters may depend sensitively on the employed jet models.

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Section: Application To the Gw170817/grb 170817a Afterglowmentioning

confidence: 99%

Are Interactions with Neutron Star Merger Winds Shaping the Jets?

Nativi,

Lamb,

Rosswog

et al. 2021

Preprint

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“…Radio imaging with micro-arcseconds astrometric precision will allow SKA to measure the source proper motion, thus constraining the viewing angle (e.g. [24]) through multi-wavelength modelling of the afterglow emission (e.g. [25,26]).…”

Section: The Square Kilometre Array (Ska) and Other Ground-based Radi...mentioning

confidence: 99%

Synergies of THESEUS with the large facilities of the 2030s and guest observer opportunities

Rosati,

Basa,

Blain

et al. 2021

Preprint

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The proposed THESEUS mission will vastly expand the capabilities to monitor the high-energy sky, and will exploit large samples of gamma-ray bursts to probe the early Universe back to the first generation of stars, and to advance multi-messenger astrophysics by detecting and localizing the counterparts of gravitational waves and cosmic neutrino sources. The combination and coordination of these activities with multiwavelength, multi-messenger facilities expected to be operating in the thirties will open new avenues of exploration in many areas of astrophysics, cosmology and fundamental physics, thus adding considerable strength to the overall scientific impact of THESEUS and these facilities. We discuss here a number of these powerful synergies.

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“…In the case of structured jets, the sideways expansion is introduced by the prescription of concentric top-hat jets (Ryan et al 2020;Fernández et al 2021). It is a rather provisional prescription that treats a structured jet as a superposion of top-hat jets with different equivalent isotropic energies and opening angles and assumes that each top-hat jet independently expands sideways.…”

Section: Effects Of Sideways Expansion Of the Jet On The Spectral Evo...mentioning

confidence: 99%

“…It is a rather provisional prescription that treats a structured jet as a superposion of top-hat jets with different equivalent isotropic energies and opening angles and assumes that each top-hat jet independently expands sideways. One prescription that models the spreading behaviour of top-hat jets resonably well in practice is the one given by (Granot & Piran 2012;Fernández et al 2021):…”

Section: Effects Of Sideways Expansion Of the Jet On The Spectral Evo...mentioning

confidence: 99%

Probing the particle acceleration at trans-relativistic shocks with gamma-ray burst afterglows

Takahashi¹,

Ioka²,

Ohira³

et al. 2021

Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)

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The detail of the particle acceleration at trans-relativistic shocks is still under debate. We propose a way to probe the particle acceleration at trans-relativistic shocks with observations of gamma-ray burst (GRB) afterglows. In the afterglow phase, the shock wave launched in a GRB is gradually decelerated from the relativistic to non-relativistic regimes by sweeping up the ambient interstellar matter. If the electron power-law index depends on the shock Lorentz factor, it is reflected to the evolution of the afterglow spectrum. We theoretically study the time evolution of the electron power-law index imprinted in GRB afterglow spectra. We introduce a particle acceleration model by a trans-relativistic shock into the standard GRB afterglow model and apply the formulation to structured jet models that are consistent with GRB 170817A, which is the counterpart of the gravitational-wave signal GW170817 from a binary neutron star merger. As a result, we find that it is possible to observe the transition of the electron acceleration from the relativistic phase to the non-relativistic phase in the evolution of the afterglow spectrum, if GRBs similar to GRB 170817A take place in a dense environment at 200 Mpc. The detection number of short GRBs will increase in the era of the multi-messenger astronomy including gravitational waves. Thus, we expect that future GRBs can give a constraint on particle acceleration models as proposed in our study.

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Lateral spreading effects on VLBI radio images of neutron star merger jets

Cited by 3 publications

References 0 publications

Are Interactions with Neutron Star Merger Winds Shaping the Jets?

Are Interactions with Neutron Star Merger Winds Shaping the Jets?

Synergies of THESEUS with the large facilities of the 2030s and guest observer opportunities

Probing the particle acceleration at trans-relativistic shocks with gamma-ray burst afterglows

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