PSR J0108−1431

PSR J0108−1431
Données d'observation
(époque J2000.0)
Ascension droite 01h 08m 08,29s[1]
Déclinaison −14° 31′ 48,5″[1]
Constellation Baleine
Magnitude apparente ≥ 27,8[2]

Localisation dans la constellation : Baleine

(Voir situation dans la constellation : Baleine)
Astrométrie
Mouvement propre μα = 92 ± 44 mas/a[3]
μδ = −176 ± 70 mas/a[3]
Distance ∼ 424 a.l. (∼ 130 pc)[4]
Caractéristiques physiques
Température 88 000 K[5]
Âge 166 Ma[3]

PSR J0108−1431 est un pulsar situé à une distance d’environ environ 130 pc (∼424 al) dans la constellation de la Baleine. Ce pulsar a été découvert en 1994 lors du Parkes Southern Pulsar Survey[6]. Il est considéré comme un pulsar très ancien avec un âge estimé à 166 millions d’années et une période de rotation de 0,8 seconde[3]. L’énergie de rotation générée par le spin-down de ce pulsar est de 5,8 × 1023 W et le champ magnétique de surface est de 2,5 × 107 T. En 2008, c’est le deuxième pulsar le plus faible connu[2].

Une émission de rayons X avec un flux d’énergie de (9 ± 2) × 10−18 W m-2 a été détectée dans la bande 0,3 à 8 keV à l’aide du télescope spatial Chandra. Cette énergie de rayons X est générée par la conversion de 0,4 % de la puissance de spin-down du pulsar. En 2009, le PSR J0108-1431 est le moins puissant des pulsars ordinaires qui ont été détectés dans le domaine des rayons X[3].

Le Très Grand Télescope de l’ESO dans le nord du Chili a observé une possible contrepartie optique de cette étoile à neutrons. L’objet a une magnitude apparente qui est (X ≤ 27,8)[2]. Aucun compagnon n’a été découvert en orbite autour de cet objet[4].

Références

  1. a et b (en) G. Hobbs, A. G. Lyne, M. Kramer, C. E. Martin et C. Jordan, « Long-term timing observations of 374 pulsars », Monthly Notices of the Royal Astronomical Society, vol. 353, no 4,‎ , p. 1311–1344 (DOI 10.1111/j.1365-2966.2004.08157.x, Bibcode 2004MNRAS.353.1311H)
  2. a b et c (en) R. P. Mignani, G. G. Pavlov et O. Kargaltsev, « A possible optical counterpart to the old nearby pulsar J0108-1431 », Astronomy & Astrophysics, vol. 488, no 3,‎ , p. 1027–1030 (DOI 10.1051/0004-6361:200810212, Bibcode 2008A&A...488.1027M, arXiv 0805.2586, S2CID 15850807)
  3. a b c d et e (en) G. G. Pavlov, O. Kargaltsev, J. A. Wong et G. P. Garmire, « Detection of X-Ray Emission from the Very Old Pulsar J0108-1431 », The Astronomical Journal, vol. 691, no 1,‎ , p. 458–464 (DOI 10.1088/0004-637X/691/1/458, Bibcode 2009ApJ...691..458P, arXiv 0803.0761, S2CID 6283029)
  4. a et b (en) B. Posselt, R. Neuhäuser et F. Haberl, « Searching for substellar companions of young isolated neutron stars », Astronomy & Astrophysics, vol. 496, no 2,‎ , p. 533–545 (DOI 10.1051/0004-6361/200810156, Bibcode 2009A&A...496..533P, arXiv 0811.0398, S2CID 10639250)
  5. (en) Oleg Kargaltsev, George G. Pavlov et Roger W. Romani, « Ultraviolet Emission from the Millisecond Pulsar J0437-4715 », The Astronomical Journal, vol. 602, no 1,‎ , p. 327–335 (DOI 10.1086/380993, Bibcode 2004ApJ...602..327K, S2CID 15199158)
  6. (en) T. M. Tauris et al., « Discovery of PSR J0108-1431: The closest known neutron star? », The Astronomical Journal Letters, vol. 428, no 2,‎ , L53–L55 (DOI 10.1086/187391, Bibcode 1994ApJ...428L..53T, lire en ligne [PDF], consulté le )

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