Searching for substellar companions of young isolated neutron stars

B. Posselt, R. Neuhäuser, F. Haberl

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Context. Only two planetary systems orbiting old ms-pulsars have been discovered. Young radio pulsars and radio-quiet neutron stars cannot be analysed by the usually-applied radio-pulse-timing technique. However, finding substellar companions orbiting these neutron stars would be of significant importance: the companion may have had an exotic formation, its observation may also enable us to study neutron-star physics. Aims. We investigate the closest young neutron stars to Earth to search for orbiting substellar companions. Methods. Young, thus warm, substellar companions are visible in the Near infrared, in which the neutron star itself is much fainter. Four young neutron stars are at sufficient speed to enable a common proper-motion search for substellar companions within few years. Results. For Geminga, RX J0720.4-3125, RX J1856.6-3754, and PSR J1932+1059 we found no comoving companion of masses as low as 12, 15, 11, and 42 Jupiter masses, respectively, for assumed ages of 1, 1, 1, and 3.1 Myr, and distances of 250, 361, 167, and 361 pc, respectively. Near infrared limits are presented for these four and five additional neutron stars for which we have observations for only one epoch. Conclusions. We conclude that young, isolated neutron stars rarely have brown-dwarf companions.

Original languageEnglish (US)
Pages (from-to)533-545
Number of pages13
JournalAstronomy and Astrophysics
Volume496
Issue number2
DOIs
StatePublished - Mar 1 2009

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neutron stars
radio
near infrared
pulsars
Jupiter
time measurement
physics
planetary systems
young
proper motion
Jupiter (planet)
pulses

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Posselt, B. ; Neuhäuser, R. ; Haberl, F. / Searching for substellar companions of young isolated neutron stars. In: Astronomy and Astrophysics. 2009 ; Vol. 496, No. 2. pp. 533-545.
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Searching for substellar companions of young isolated neutron stars. / Posselt, B.; Neuhäuser, R.; Haberl, F.

In: Astronomy and Astrophysics, Vol. 496, No. 2, 01.03.2009, p. 533-545.

Research output: Contribution to journalArticle

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AU - Haberl, F.

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N2 - Context. Only two planetary systems orbiting old ms-pulsars have been discovered. Young radio pulsars and radio-quiet neutron stars cannot be analysed by the usually-applied radio-pulse-timing technique. However, finding substellar companions orbiting these neutron stars would be of significant importance: the companion may have had an exotic formation, its observation may also enable us to study neutron-star physics. Aims. We investigate the closest young neutron stars to Earth to search for orbiting substellar companions. Methods. Young, thus warm, substellar companions are visible in the Near infrared, in which the neutron star itself is much fainter. Four young neutron stars are at sufficient speed to enable a common proper-motion search for substellar companions within few years. Results. For Geminga, RX J0720.4-3125, RX J1856.6-3754, and PSR J1932+1059 we found no comoving companion of masses as low as 12, 15, 11, and 42 Jupiter masses, respectively, for assumed ages of 1, 1, 1, and 3.1 Myr, and distances of 250, 361, 167, and 361 pc, respectively. Near infrared limits are presented for these four and five additional neutron stars for which we have observations for only one epoch. Conclusions. We conclude that young, isolated neutron stars rarely have brown-dwarf companions.

AB - Context. Only two planetary systems orbiting old ms-pulsars have been discovered. Young radio pulsars and radio-quiet neutron stars cannot be analysed by the usually-applied radio-pulse-timing technique. However, finding substellar companions orbiting these neutron stars would be of significant importance: the companion may have had an exotic formation, its observation may also enable us to study neutron-star physics. Aims. We investigate the closest young neutron stars to Earth to search for orbiting substellar companions. Methods. Young, thus warm, substellar companions are visible in the Near infrared, in which the neutron star itself is much fainter. Four young neutron stars are at sufficient speed to enable a common proper-motion search for substellar companions within few years. Results. For Geminga, RX J0720.4-3125, RX J1856.6-3754, and PSR J1932+1059 we found no comoving companion of masses as low as 12, 15, 11, and 42 Jupiter masses, respectively, for assumed ages of 1, 1, 1, and 3.1 Myr, and distances of 250, 361, 167, and 361 pc, respectively. Near infrared limits are presented for these four and five additional neutron stars for which we have observations for only one epoch. Conclusions. We conclude that young, isolated neutron stars rarely have brown-dwarf companions.

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