No Neutron Star Companion To The Lowest Mass SDSS White Dwarf

Details No Neutron Star Companion To The Lowest Mass SDSS White Dwarf No Neutron Star Companion To The Lowest Mass SDSS White Dwarf

2009-06-29

arxiv.org/abs/0906.5109v1

Astrophys.J.700:L123-L126,2009

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

4 pages, 1 table; to appear in the Astrophysical Journal Letters

Scientific paper

10.1088/0004-637X/700/2/L123

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; Kilic et al. 2007a,b). 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 (Kilic 2007b). 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.

Affiliated with

Also associated with

No associations

Rating

No Neutron Star Companion To The Lowest Mass SDSS White Dwarf does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with No Neutron Star Companion To The Lowest Mass SDSS White Dwarf, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and No Neutron Star Companion To The Lowest Mass SDSS White Dwarf will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-246975