Sign on

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:0906.5109)
· On-line Data
· References in the article
· Citations to the Article (2) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (6)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
No Neutron Star Companion to the Lowest Mass SDSS White Dwarf
Authors:
Agüeros, Marcel A.; Heinke, Craig; Camilo, Fernando; Kilic, Mukremin; Anderson, Scott F.; Freire, Paulo; Kleinman, Scot J.; Liebert, James W.; Silvestri, Nicole M.
Affiliation:
AA(Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027, USA ; NSF Astronomy & Astrophysics Postdoctoral Fellow. ; ), AB(Department of Physics, University of Alberta, Edmonton, AB T6G 2G7, Canada ), AC(Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027, USA ), AD(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA ; Spitzer Fellow.), AE(Department of Astronomy, University of Washington, Seattle, WA 98195, USA ), AF(Arecibo Observatory, Arecibo, PR 00612, USA ), AG(Gemini Observatory, Northern Operations Center, Hilo, HI 96720, USA ), AH(Steward Observatory, University of Arizona, Tucson, AZ 85721, USA ), AI(Department of Astronomy, University of Washington, Seattle, WA 98195, USA )
Publication:
The Astrophysical Journal Letters, Volume 700, Issue 2, pp. L123-L126 (2009). (ApJL Homepage)
Publication Date:
08/2009
Origin:
IOP
ApJ Keywords:
pulsars: general, stars: individual: SDSS J091709.55+463821.8, white dwarfs
DOI:
10.1088/0004-637X/700/2/L123
Bibliographic Code:
2009ApJ...700L.123A

Abstract

SDSS J091709.55+463821.8 (hereafter J0917+4638) is the lowest surface gravity white dwarf (WD) currently known, with log g = 5.55 ± 0.05 (M ≈ 0.17 M sun). Such low-mass white dwarfs (LMWDs) are believed to originate in binaries that evolve into WD/WD or WD/neutron star (NS) systems. An optical search for J0917+4638's companion showed that it must be a compact object with a mass >=0.28 M sun. Here we report on Green Bank Telescope 820 MHz and XMM-Newton X-ray observations of J0917+4638 intended to uncover a potential NS companion to the LMWD. No convincing pulsar signal is detected in our radio data. Our X-ray observation also failed to detect X-ray emission from J0917+4638's companion, while we would have detected any of the millisecond radio pulsars in 47 Tuc. We conclude that the companion is almost certainly another WD.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints