Notes for PSR B1620-26
by
Jean Schneider
update: 1 October 2004
The planet:
- Detection method: Timing
- Basic data:
| M.sini ( MJ): |
2.5 ± 1 | |
| Semi-major axis (AU): |
23 | |
| Orbital period (yrs): |
~ 100 | |
| Eccentricity: |
- | |
| Inclination (deg): |
55+14-8 | |
- Remarks:
10 Jul. 2003: Planet parameters determined with Hubble by
measurements of the white dwarf companion characteristics (Sigurdsson
et al, 2003)
Compare with old parameters
1999: The pulsar is in a binary system (period = 191.4428 d.)
with a white dwarf companion (Thorsett et al. 1999); this explains the
uncertainties in the fitting of the planet parameters.
- References:
- ARZOUMIAN Z., JOSHI K., RASIO F. & THORSETT S., 1996
Orbital Parameters of the PSR B1620-26 Triple System.
in
Pulsars: Problems and Progress,
eds. M. Bailes, S. Johnston, & M. Walker
(IAU Colloquium 160, Astronomical Soc. of the Pacific, Conf.
Series), p.525.
paper
- BACKER D. C., FOSTER R. S. & SALLMEN S., 1993
A second companion of the millisecond pulsar 1620-26
Nature, 365, 817
- BEER M., KING A., & PRINGLE J., 2004
The planet in M4: implications for planet formation in globular clusters.
MNRAS, accepted
preprint
- FORD E., JOSHI K., RASIO F. & ZBARSKI B., 1999
Theoretical Implications of the PSR B1620-26 Triple System
and its Planet
ApJ., 528, 336
paper
preprint
- JOSHI K. & RASIO F., 1997
Distant Companions and Planets around Millisecond Pulsars
ApJ., 479, 948
paper
(ApJ., 488, 901:
erratum)
- RASIO F., 1998
New Evidence for a Planet or Brown Dwarf in Orbit Around PSR B1620-26.
in Proc. of Texas Symposium on Relativistic Astrophysics, eds. A.
Olinto et al. (Ann. N.Y. Acad. Sci.), in press.
- RASIO F. A., 1994
Is there a planet in the PSR 1620-26 triple system?
ApJ. Letters, 427, 107L
abstract
and paper.
- RICHER H., IBATA R., FAHLMAN G. & HUBER M., 2003
The Pulsar-White Dwarf-Planet System in Messier 4:
Improved Astrometry.
ApJ, accepted
preprint
- SCHEARER A., BUTLER R., REDFERN R., CULLUM M.; & DANKS A., 1996
A Search for the Optical Counterpart of the Triple Pulsar System PSR
B1620-26 in M4.
ApJ.L., 473, L115
paper
- SIGURDSSON S., RICHER H., HANSEN B., STAIRS I & THORSETT S., 2003
A Young White Dwarf Companion to Pulsar B1620-26: Evidence for
Early Planet Formation.
Science, 301 193
paper
paper
- SIGURDSSON S., 1995
Assessing the Environmental Impact on PSR~B1620-26 in M4.
ApJ., 452, 323
abstract
- THORSETT S., ARZOUMANIAN Z., CAMILO F. & LYNE A., 1999
The Triple Pulsar System PSR B1620-26 in M4
ApJ. 523, 763
paper
The star (binary pulsar-WD):
- Distance: 3.8 kpc
This distance is deduced from a DM of 63 pc.cm-3, using the
on-line model of Taylor
and Cordes
(ApJ., 411, 674, 1993).
- Stellar type: WD, PSR
- Apparent magnitude: VWD = 24
- Coordinates (2000): RA = 16 23 38, DEC = -26 -21 -53
- Metallicity: [Fe/H] = -
- Mass (M_sun): MWD = 0.34 ± 0.04,
MPSR = 1.35
- Age: AWD = 0.5 Gy
- Binary orbit:
- Period: 191.4428 d.
- Eccentricity: 0.025
- Inclination (deg): 55+14-8
- More data:
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Extra-solar Planets Catalog