A search for pulsar companions around low-mass white dwarfs

• Verfasst von: Athanasiadis, Tilemachos M. [VerfasserIn]
• Verfasst von: Berezina, Marina [VerfasserIn]
• Verfasst von: Antoniadis, John [VerfasserIn]
• Verfasst von: Champion, David J [VerfasserIn]
• Verfasst von: Cruces, Marilyn [VerfasserIn]
• Verfasst von: Spitler, Laura [VerfasserIn]
• Verfasst von: Kramer, Michael [VerfasserIn]
• Titel: A search for pulsar companions around low-mass white dwarfs
• Verf.angabe: Tilemachos M. Athanasiadis, Marina Berezina, John Antoniadis, David J. Champion, Marilyn Cruces, Laura Spitler and Michael Kramer
• E-Jahr: 2021
• Jahr: 31 May 2021
• Umfang: 8 S.
• Fussnoten: Gesehen am 18.11.2021
• Titel Quelle: Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
• Ort Quelle: Oxford : Oxford Univ. Press, 1827
• Jahr Quelle: 2021
• Band/Heft Quelle: 505(2021), 4 vom: Aug., Seite 4981-4988
• ISSN Quelle: 1365-2966
• DOI: doi:10.1093/mnras/stab1580
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1777962064

Abstract

We report on a search for pulsars at the positions of eight low-mass white dwarfs and one higher mass white dwarf with the 100-m Effelsberg Radio Telescope. These systems have orbital parameters suggesting that their unseen companions are either massive white dwarfs or neutron stars (NSs). Our observations were performed at 1.36 GHz, reaching sensitivities of 0.1-0.2 mJy. We searched our data accounting for the possible acceleration and jerk of the pulsar signals due to orbital motion, but found no significant pulsar signals. Considering our result jointly with 20 non-detections of similar systems with the Greenbank Radio Telescope, we infer fNS ≤ 0.10, for the fraction of NSs orbiting these white dwarfs. We discuss the sensitivity of this result to the underlying assumptions and conclude with a brief discussion on the prospects of targeted surveys for discovering millisecond pulsars.