PSR J1719-1438 b

From the Science Archives, the open-project database of science information
Jump to navigation Jump to search
PSR J1719-1438 b
Exoplanet List of exoplanets
Parent star
Star PSR J1719-1438
Constellation Serpens
Right ascension (α) 17h 19m 10s
Declination (δ) −14° 38′ 01″
Distance~3900 ly
(~1200 pc)
Spectral type Pulsar
Mass (m) ~1.4 M
Age >12.5 Gyr
Orbital elements
Semi-major axis(a) 0.004 AU
Eccentricity (e) < 0.06
Orbital period(P) 0.090706293 d
    (2.176951032 h)
Time of periastron (T0) 2,455,235.51652439 JD
Physical characteristics
Mass(m)~1.02 MJ
(~330 M)
Radius(r)≤0.4 RJ
(≤4 R)
Density(ρ)≥23 g cm−3
Discovery information
Discovery date 25 August 2011
Discoverer(s) Matthew Bailes et al.
Discovery method Pulsar timing
Discovery site Parkes Observatory, Australia
Discovery status Confirmed
Database references
Extrasolar Planets
Exoplanet Archivedata
Open Exoplanet Cataloguedata

PSR J1719-1438 b is an extrasolar planet that was discovered on August 25, 2011 in orbit around PSR J1719-1438, a millisecond pulsar. The pulsar planet is most likely composed largely of crystalline carbon, but with a density far greater than diamond.[1][2] PSR J1719-1438 b orbits so closely to its host star, the planet's orbit would fit inside the Sun. The existence of such carbon planets had been theoretically postulated.

Observational history[edit]

PSR J1719-1438 was first observed in 2009 by a team headed by Matthew Bailes of Swinburne University of Technology in Melbourne, Australia. The orbiting planet was published in the journal Science on August 25, 2011.[3] The planet was confirmed through pulsar timing, in which small modulations detected in the highly regular pulsar signature are measured and extrapolated.[4] Observatories in Britain, Hawaii, and Australia were used to confirm these observations.[1]

Host star[edit]

PSR J1719-1438 is a pulsar some 4,000 light years away from Earth in the Serpens Cauda constellation, approximately one minute from the border with Ophiuchus. The pulsar completes more than 10,000 rotations a minute. It is approximately 12 miles across, but has a mass that is 1.4 solar masses.[3]


PSR J1719-1438 b was, at the time of its August 25, 2011 discovery, the densest planet ever discovered, at nearly 20 times the density of Jupiter (about 23 times the density of water).[1] It is slightly more massive than Jupiter.[1] It is thought to be composed of oxygen and carbon (as opposed to hydrogen and helium, the main components of gas giants like Jupiter and Saturn).

The oxygen is most likely on the surface of the planet, with increasingly higher quantities of carbon deeper inside the planet. The intense pressure acting upon the planet suggests that the carbon is crystallized, much like diamond is.[1]

PSR J1719-1438 b orbits its host star with a period of 2.177 hours and at a distance of a little bit less than one (0.89) solar radius.[1]

See also[edit]

  • WASP-12b, a carbon planet
  • BPM 37093, a carbon star
  • EF Eridani, a star system with a compact star and a degraded planetary-mass former star


  1. 1.0 1.1 1.2 1.3 1.4 1.5 Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).
  2. Bailes, M.; Bates, S. D.; Bhalerao, V.; Bhat, N. D. R.; Burgay, M.; Burke-Spolaor, S.; d'Amico, N.; Johnston, S. et al. (2011). "Transformation of a Star into a Planet in a Millisecond Pulsar Binary". Science 333 (6050): 1717–20. arXiv:1108.5201. Bibcode 2011Sci...333.1717B. doi:10.1126/science.1208890. PMID 21868629.
  3. 3.0 3.1 Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).
  4. Lua error in Module:Citation/CS1 at line 379: attempt to call method 'match' (a nil value).

Add your comment
The Science Archives welcomes all comments. If you do not want to be anonymous, register or log in. It is free.

As a reminder, article comments are only for discussions on how to improve the article. Please direct other comments to a user's talk page. Please be formal and do not use excessive uppercase. Please be advised you may receive an automatic block if you break the article comments policy. For information regarding what is acceptable/not acceptable in article comments, please message Icons-flag-ru.png Joey (talk), Natalia (talk), Icons-flag-fr.png ynoss (talk), or Icons-flag-ca.png Daniel (older account/talk).

Further reading[edit]

Preceded by
Most dense planet
2011 —2015
Succeeded by