The spectrum of the recycled PSR J0437-4715 and its white dwarf companion

Martin Durant, Oleg Kargaltsev, George Pavlov, Piotr M. Kowalski, Bettina Posselt, Marten H. Van Kerkwijk, David L. Kaplan

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We present extensive spectral and photometric observations of the recycled pulsar/white dwarf binary containing PSR J0437-4715, which we analyzed together with archival X-ray and gamma-ray data, to obtain the complete mid-infrared to gamma-ray spectrum. We first fit each part of the spectrum separately, and then the whole multi-wavelength spectrum. We find that the optical-infrared part of the spectrum is well fit by a cool white dwarf atmosphere model with pure hydrogen composition. The model atmosphere (T eff = 3950 150K, log g = 6.98 ± 0.15, R WD = (1.9 ± 0.2) × 10 9cm) fits our spectral data remarkably well for the known mass and distance (M = 0.25 ± 0.02 M, d = 156.3 ± 1.3pc), yielding the white dwarf age (τWD = 6.0 ± 0.5Gyr). In the UV, we find a spectral shape consistent with thermal emission from the bulk of the neutron star surface, with surface temperature between 1.25 × 105 and 3.5 × 105K. The temperature of the thermal spectrum suggests that some heating mechanism operates throughout the life of the neutron star. The temperature distribution on the neutron star surface is non-uniform. In the X-rays, we confirm the presence of a high-energy tail which is consistent with a continuation of the cutoff power-law component (Γ = 1.56 ± 0.01, E cut = 1.1 ± 0.2GeV) that is seen in gamma rays and perhaps even extends to the near-UV.

Original languageEnglish (US)
Article number6
JournalAstrophysical Journal
Volume746
Issue number1
DOIs
StatePublished - Feb 10 2012

Fingerprint

neutron stars
gamma rays
atmospheres
gamma ray spectra
thermal emission
pulsars
atmosphere
surface temperature
temperature distribution
x rays
cut-off
power law
temperature
heating
hydrogen
wavelength
wavelengths
energy

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Durant, M., Kargaltsev, O., Pavlov, G., Kowalski, P. M., Posselt, B., Van Kerkwijk, M. H., & Kaplan, D. L. (2012). The spectrum of the recycled PSR J0437-4715 and its white dwarf companion. Astrophysical Journal, 746(1), [6]. https://doi.org/10.1088/0004-637X/746/1/6
Durant, Martin ; Kargaltsev, Oleg ; Pavlov, George ; Kowalski, Piotr M. ; Posselt, Bettina ; Van Kerkwijk, Marten H. ; Kaplan, David L. / The spectrum of the recycled PSR J0437-4715 and its white dwarf companion. In: Astrophysical Journal. 2012 ; Vol. 746, No. 1.
@article{3584d35c5abf45969a0f8327484f2f40,
title = "The spectrum of the recycled PSR J0437-4715 and its white dwarf companion",
abstract = "We present extensive spectral and photometric observations of the recycled pulsar/white dwarf binary containing PSR J0437-4715, which we analyzed together with archival X-ray and gamma-ray data, to obtain the complete mid-infrared to gamma-ray spectrum. We first fit each part of the spectrum separately, and then the whole multi-wavelength spectrum. We find that the optical-infrared part of the spectrum is well fit by a cool white dwarf atmosphere model with pure hydrogen composition. The model atmosphere (T eff = 3950 150K, log g = 6.98 ± 0.15, R WD = (1.9 ± 0.2) × 10 9cm) fits our spectral data remarkably well for the known mass and distance (M = 0.25 ± 0.02 M, d = 156.3 ± 1.3pc), yielding the white dwarf age (τWD = 6.0 ± 0.5Gyr). In the UV, we find a spectral shape consistent with thermal emission from the bulk of the neutron star surface, with surface temperature between 1.25 × 105 and 3.5 × 105K. The temperature of the thermal spectrum suggests that some heating mechanism operates throughout the life of the neutron star. The temperature distribution on the neutron star surface is non-uniform. In the X-rays, we confirm the presence of a high-energy tail which is consistent with a continuation of the cutoff power-law component (Γ = 1.56 ± 0.01, E cut = 1.1 ± 0.2GeV) that is seen in gamma rays and perhaps even extends to the near-UV.",
author = "Martin Durant and Oleg Kargaltsev and George Pavlov and Kowalski, {Piotr M.} and Bettina Posselt and {Van Kerkwijk}, {Marten H.} and Kaplan, {David L.}",
year = "2012",
month = "2",
day = "10",
doi = "10.1088/0004-637X/746/1/6",
language = "English (US)",
volume = "746",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

Durant, M, Kargaltsev, O, Pavlov, G, Kowalski, PM, Posselt, B, Van Kerkwijk, MH & Kaplan, DL 2012, 'The spectrum of the recycled PSR J0437-4715 and its white dwarf companion', Astrophysical Journal, vol. 746, no. 1, 6. https://doi.org/10.1088/0004-637X/746/1/6

The spectrum of the recycled PSR J0437-4715 and its white dwarf companion. / Durant, Martin; Kargaltsev, Oleg; Pavlov, George; Kowalski, Piotr M.; Posselt, Bettina; Van Kerkwijk, Marten H.; Kaplan, David L.

In: Astrophysical Journal, Vol. 746, No. 1, 6, 10.02.2012.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The spectrum of the recycled PSR J0437-4715 and its white dwarf companion

AU - Durant, Martin

AU - Kargaltsev, Oleg

AU - Pavlov, George

AU - Kowalski, Piotr M.

AU - Posselt, Bettina

AU - Van Kerkwijk, Marten H.

AU - Kaplan, David L.

PY - 2012/2/10

Y1 - 2012/2/10

N2 - We present extensive spectral and photometric observations of the recycled pulsar/white dwarf binary containing PSR J0437-4715, which we analyzed together with archival X-ray and gamma-ray data, to obtain the complete mid-infrared to gamma-ray spectrum. We first fit each part of the spectrum separately, and then the whole multi-wavelength spectrum. We find that the optical-infrared part of the spectrum is well fit by a cool white dwarf atmosphere model with pure hydrogen composition. The model atmosphere (T eff = 3950 150K, log g = 6.98 ± 0.15, R WD = (1.9 ± 0.2) × 10 9cm) fits our spectral data remarkably well for the known mass and distance (M = 0.25 ± 0.02 M, d = 156.3 ± 1.3pc), yielding the white dwarf age (τWD = 6.0 ± 0.5Gyr). In the UV, we find a spectral shape consistent with thermal emission from the bulk of the neutron star surface, with surface temperature between 1.25 × 105 and 3.5 × 105K. The temperature of the thermal spectrum suggests that some heating mechanism operates throughout the life of the neutron star. The temperature distribution on the neutron star surface is non-uniform. In the X-rays, we confirm the presence of a high-energy tail which is consistent with a continuation of the cutoff power-law component (Γ = 1.56 ± 0.01, E cut = 1.1 ± 0.2GeV) that is seen in gamma rays and perhaps even extends to the near-UV.

AB - We present extensive spectral and photometric observations of the recycled pulsar/white dwarf binary containing PSR J0437-4715, which we analyzed together with archival X-ray and gamma-ray data, to obtain the complete mid-infrared to gamma-ray spectrum. We first fit each part of the spectrum separately, and then the whole multi-wavelength spectrum. We find that the optical-infrared part of the spectrum is well fit by a cool white dwarf atmosphere model with pure hydrogen composition. The model atmosphere (T eff = 3950 150K, log g = 6.98 ± 0.15, R WD = (1.9 ± 0.2) × 10 9cm) fits our spectral data remarkably well for the known mass and distance (M = 0.25 ± 0.02 M, d = 156.3 ± 1.3pc), yielding the white dwarf age (τWD = 6.0 ± 0.5Gyr). In the UV, we find a spectral shape consistent with thermal emission from the bulk of the neutron star surface, with surface temperature between 1.25 × 105 and 3.5 × 105K. The temperature of the thermal spectrum suggests that some heating mechanism operates throughout the life of the neutron star. The temperature distribution on the neutron star surface is non-uniform. In the X-rays, we confirm the presence of a high-energy tail which is consistent with a continuation of the cutoff power-law component (Γ = 1.56 ± 0.01, E cut = 1.1 ± 0.2GeV) that is seen in gamma rays and perhaps even extends to the near-UV.

UR - http://www.scopus.com/inward/record.url?scp=84856238970&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84856238970&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/746/1/6

DO - 10.1088/0004-637X/746/1/6

M3 - Article

VL - 746

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 6

ER -

Durant M, Kargaltsev O, Pavlov G, Kowalski PM, Posselt B, Van Kerkwijk MH et al. The spectrum of the recycled PSR J0437-4715 and its white dwarf companion. Astrophysical Journal. 2012 Feb 10;746(1). 6. https://doi.org/10.1088/0004-637X/746/1/6