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Title: PSR J1311-3430: A HEAVYWEIGHT NEUTRON STAR WITH A FLYWEIGHT HELIUM COMPANION

Abstract

We have obtained initial spectroscopic observations and additional photometry of the newly discovered P{sub b} = 94 minute {gamma}-ray black-widow pulsar PSR J1311-3430. The Keck spectra show a He-dominated, nearly H-free photosphere and a large radial-velocity amplitude of 609.5 {+-} 7.5 km s{sup -1}. Simultaneous seven-color GROND photometry further probes the heating of this companion, and shows the presence of a flaring infrared excess. We have modeled the quiescent light curve, constraining the orbital inclination and masses. Simple heated light-curve fits give M{sub NS} = 2.7 M{sub Sun }, but show systematic light-curve differences. Adding extra components allows a larger mass range to be fit, but all viable solutions have M{sub NS} > 2.1 M{sub Sun }. If confirmed, such a large M{sub NS} substantially constrains the equation of state of matter at supernuclear densities.

Authors:
 [1]; ; ;  [2]; ; ;  [3];  [4]
  1. Department of Physics, Stanford University, Stanford, CA 94305 (United States)
  2. Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States)
  3. Max-Planck-Instituet fuer Extraterrestrische Physik, D-85748 Garching (Germany)
  4. Max-Planck-Instituet fuer Gravitationsphysik (Albert-Einstein-Instituet), D-30167 Hannover (Germany)
Publication Date:
OSTI Identifier:
22078399
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 760; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COLOR; DENSITY; EQUATIONS OF STATE; FLARING; HEATING; HELIUM; INCLINATION; INFRARED RADIATION; MATHEMATICAL SOLUTIONS; NEUTRON STARS; PHOTOMETRY; PHOTOSPHERE; PULSARS; RADIAL VELOCITY; SPECTRA; VISIBLE RADIATION

Citation Formats

Romani, Roger W., Filippenko, Alexei V., Silverman, Jeffrey M., Cenko, S. Bradley, Greiner, Jochen, Rau, Arne, Elliott, Jonathan, and Pletsch, Holger J., E-mail: rwr@astro.stanford.edu. PSR J1311-3430: A HEAVYWEIGHT NEUTRON STAR WITH A FLYWEIGHT HELIUM COMPANION. United States: N. p., 2012. Web. doi:10.1088/2041-8205/760/2/L36.
Romani, Roger W., Filippenko, Alexei V., Silverman, Jeffrey M., Cenko, S. Bradley, Greiner, Jochen, Rau, Arne, Elliott, Jonathan, & Pletsch, Holger J., E-mail: rwr@astro.stanford.edu. PSR J1311-3430: A HEAVYWEIGHT NEUTRON STAR WITH A FLYWEIGHT HELIUM COMPANION. United States. doi:10.1088/2041-8205/760/2/L36.
Romani, Roger W., Filippenko, Alexei V., Silverman, Jeffrey M., Cenko, S. Bradley, Greiner, Jochen, Rau, Arne, Elliott, Jonathan, and Pletsch, Holger J., E-mail: rwr@astro.stanford.edu. Sat . "PSR J1311-3430: A HEAVYWEIGHT NEUTRON STAR WITH A FLYWEIGHT HELIUM COMPANION". United States. doi:10.1088/2041-8205/760/2/L36.
@article{osti_22078399,
title = {PSR J1311-3430: A HEAVYWEIGHT NEUTRON STAR WITH A FLYWEIGHT HELIUM COMPANION},
author = {Romani, Roger W. and Filippenko, Alexei V. and Silverman, Jeffrey M. and Cenko, S. Bradley and Greiner, Jochen and Rau, Arne and Elliott, Jonathan and Pletsch, Holger J., E-mail: rwr@astro.stanford.edu},
abstractNote = {We have obtained initial spectroscopic observations and additional photometry of the newly discovered P{sub b} = 94 minute {gamma}-ray black-widow pulsar PSR J1311-3430. The Keck spectra show a He-dominated, nearly H-free photosphere and a large radial-velocity amplitude of 609.5 {+-} 7.5 km s{sup -1}. Simultaneous seven-color GROND photometry further probes the heating of this companion, and shows the presence of a flaring infrared excess. We have modeled the quiescent light curve, constraining the orbital inclination and masses. Simple heated light-curve fits give M{sub NS} = 2.7 M{sub Sun }, but show systematic light-curve differences. Adding extra components allows a larger mass range to be fit, but all viable solutions have M{sub NS} > 2.1 M{sub Sun }. If confirmed, such a large M{sub NS} substantially constrains the equation of state of matter at supernuclear densities.},
doi = {10.1088/2041-8205/760/2/L36},
journal = {Astrophysical Journal Letters},
number = 2,
volume = 760,
place = {United States},
year = {Sat Dec 01 00:00:00 EST 2012},
month = {Sat Dec 01 00:00:00 EST 2012}
}