Neutron stars: structure, evolution and gravitational waves

• Grant number: 20/08518-2
• Support Opportunities: Regular Research Grants
• Start date: February 01, 2021
• End date: June 30, 2023
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
• Principal Investigator: Jorge Ernesto Horvath
• Grantee: Jorge Ernesto Horvath
• Host Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated researchers: Pedro Henrique Ribeiro da Silva Moraes

Abstract

This Plan aims to advance in the knowledge of the populations and structure of neutron stars. We propose to investigate the objects resulting from the mergers (fusions) of NSs detected in gravitational waves and electromagnetic frequencies: their final mass distribution, both for NSs remnants (if any) and BHs. We will help to establish the origin of the merging binary systems, their evolutionary channels and their diversity. We will study the issue of maximum mass (with important consequences for the state of super-dense matter), in particular that indicated by the "spider" binary systems that could produce the largest masses of NS in Nature, and possibly low-mass black holes to be searched for in real X-ray sources. Finally, we will calculate the nucleosynthesis resulting from fusion events where the two compact stars are "exotic" in composition and we will work to refine and firm NS-NS fusions as "standard sirens", in order to determine the Hubble constant with errors ~ 1 % independently. (AU)

Scientific publications

(10)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

HORVATH, JORGE E.; ROSAS FERNANDES, RODRIGO. Conceptual diagrams in Quantum Mechanics. ASTRONOMISCHE NACHRICHTEN, v. N/A, p. 10-pg., 2023-03-15. (20/08518-2)

BARAO, L. G.; DE SA, L. M.; BERNARDO, A.; HORVATH, J. E.. Describing the evolution and perturbations to biodiversity using a simple dynamical model. ASTRONOMISCHE NACHRICHTEN, v. N/A, p. 8-pg., 2023-02-02. (20/08518-2, 13/26258-4)

DE SA, LUCAS M.; BERNARDO, ANTONIO; BACHEGA, RIIS R. A.; ROCHA, LIVIA S.; HORVATH, JORGE E.. Effects of a non-universal IMF and binary parameter correlations on compact binary mergers. ASTRONOMISCHE NACHRICHTEN, v. N/A, p. 4-pg., 2022-12-16. (20/08518-2, 13/26258-4)

DE SA, L. M.; BERNARDO, A.; BACHEGA, R. R. A.; HORVATH, J. E.; ROCHA, L. S.; MORAES, P. H. R. S.. Quantifying the Evidence Against a Mass Gap between Black Holes and Neutron Stars. ASTROPHYSICAL JOURNAL, v. 941, n. 2, p. 13-pg., 2022-12-01. (20/08518-2, 13/26258-4)

HORVATH, JORGE E.; FERNANDES, RODRIGO ROSAS; IDIART, THAIS E.. On the ontological ambiguity of physics facing reality. ASTRONOMISCHE NACHRICHTEN, v. N/A, p. 10-pg., 2023-01-13. (20/08518-2)

HORVATH, JORGE E. E.. Concluding remarks to the IWARA 2022. ASTRONOMISCHE NACHRICHTEN, v. N/A, p. 7-pg., 2023-01-04. (20/08518-2)

HORVATH, JORGE E.; BERNARDO, ANTONIO L. C.; BACHEGA, RIIS R. A.; DE SA, LUCAS M.; ROCHA, LIVIA S.; MORAES, PEDRO H. R. S.. Filling the mass gap between neutron star and black hole masses. ASTRONOMISCHE NACHRICHTEN, v. N/A, p. 6-pg., 2022-12-19. (20/08518-2)

KOPP, F.; HORVATH, J. E.; HADJIMICHEF, D.; VASCONCELLOS, C. A. Z.; HESS, P. O.. Internal heating mechanisms in neutron stars. INTERNATIONAL JOURNAL OF MODERN PHYSICS D, v. 32, n. 07, p. 24-pg., 2023-05-12. (20/08518-2)

HORVATH, J. E.. A precursor interpretation for the Crab supernova 1054 AD very early light curve. ASTROPHYSICS AND SPACE SCIENCE, v. 367, n. 8, p. 6-pg., 2022-08-01. (20/08518-2)

HORVATH, J. E.; ROCHA, L. S.; DE SA, L. M.; MORAES, P. H. R. S.; BARAO, L. G.; DE AVELLAR, M. G. B.; BERNARDO, A.; BACHEGA, R. R. A.. A light strange star in the remnant HESS J1731-347: Minimal consistency checks. Astronomy & Astrophysics, v. 672, p. 5-pg., 2023-04-20. (20/08518-2)