Optical detection of a variable millisecond pulsar companion in 47 Tucanae

Peter D. Edmonds, Ronald L. Gilliland, Craig O. Heinke, Jonathan E. Grindlay, Fernando Camilo

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

Using results from radio and X-ray observations of millisecond pulsars in 47 Tucanae, and extensive Hubble Space Telescope U, V, and I imaging of the globular cluster core, we have derived a common astrometric solution good to less than 0″.1. A close positional coincidence is found for 47 Tue U, a 4.3 ms pulsar in a 0.429 day orbit, detected in radio and X-rays, with an mv = 20.9 blue star. Analysis of extensive time series data for this optical candidate shows a 0.004 mag semiamplitude variation at the period and phase expected from the radio ephemeris, and the optical variations are spatially coincident with the candidate. This provides secure optical detection of the white dwarf companion to the millisecond pulsar, the first such detection in a globular cluster, allowing for comparisons to recent models for such companions with dependencies on mass and age.

Original languageEnglish (US)
Pages (from-to)L57-L60
JournalAstrophysical Journal
Volume557
Issue number1 PART 2
DOIs
StatePublished - Aug 10 2001

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pulsars
radio
globular clusters
blue stars
Hubble Space Telescope
x rays
time series
orbits
detection
analysis
comparison

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Edmonds, P. D., Gilliland, R. L., Heinke, C. O., Grindlay, J. E., & Camilo, F. (2001). Optical detection of a variable millisecond pulsar companion in 47 Tucanae. Astrophysical Journal, 557(1 PART 2), L57-L60. https://doi.org/10.1086/323122
Edmonds, Peter D. ; Gilliland, Ronald L. ; Heinke, Craig O. ; Grindlay, Jonathan E. ; Camilo, Fernando. / Optical detection of a variable millisecond pulsar companion in 47 Tucanae. In: Astrophysical Journal. 2001 ; Vol. 557, No. 1 PART 2. pp. L57-L60.
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Edmonds, PD, Gilliland, RL, Heinke, CO, Grindlay, JE & Camilo, F 2001, 'Optical detection of a variable millisecond pulsar companion in 47 Tucanae', Astrophysical Journal, vol. 557, no. 1 PART 2, pp. L57-L60. https://doi.org/10.1086/323122

Optical detection of a variable millisecond pulsar companion in 47 Tucanae. / Edmonds, Peter D.; Gilliland, Ronald L.; Heinke, Craig O.; Grindlay, Jonathan E.; Camilo, Fernando.

In: Astrophysical Journal, Vol. 557, No. 1 PART 2, 10.08.2001, p. L57-L60.

Research output: Contribution to journalArticle

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Edmonds PD, Gilliland RL, Heinke CO, Grindlay JE, Camilo F. Optical detection of a variable millisecond pulsar companion in 47 Tucanae. Astrophysical Journal. 2001 Aug 10;557(1 PART 2):L57-L60. https://doi.org/10.1086/323122