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==Diamond planet==
==Diamond planet==
{{main|PSR J1719-1438 b}}
{{main|PSR J1719-1438 b}}
PSR J1719-1438 was discovered in 2011 by the High Time Resolution Survey, a [[radio astronomy]] search for astronomical objects which rapidly vary in radio brightness, such as pulsars.<ref name=bailes/> Timing measurements using the [[Parkes Telescope]] and [[Lovell Telescope]] showed that it has a low-mass companion: [[PSR J1719-1438 b]].<ref name=bailes/> The companion has a mass similar to that of [[Jupiter]], but at about 40% of the diameter. It orbits the pulsar with a period of 2.17 hours at a distance of around 600,000 km (0.89 [[Solar_radius|solar radii]]).<ref name=bailes/> The companion is likely the remnant of a star whose outer layers were siphoned off by the more massive pulsar. Calculations show the companion has a minimum density of 23 [[grams]] per [[cubic centimeter]] and is probably an ultra-low mass carbon-oxygen [[white dwarf]].<ref name=bailes/>
PSR J1719-1438 was discovered in 2011 by the High Time Resolution Survey, a [[radio astronomy]] search for astronomical objects which rapidly vary in radio brightness, such as pulsars.<ref name=bailes/> Timing measurements using the [[Parkes Telescope]] and [[Lovell Telescope]] showed that it has a low-mass companion: [[PSR J1719-1438 b]].<ref name=bailes/> The companion has a mass similar to that of [[Jupiter]], but at about 40% of the diameter. It orbits the pulsar with a period of 2 hours 10 minutes and 37 seconds, at a distance of around 600,000 km (0.89 [[Solar_radius|solar radii]]).<ref name=bailes/> The companion is likely the remnant of a star whose outer layers were siphoned off by the more massive pulsar. Calculations show the companion has a minimum density of 23 [[grams]] per [[cubic centimeter]] and is probably an ultra-low mass carbon-oxygen [[white dwarf]].<ref name=bailes/>


Because the companion to PSR J1719-1438 is planet sized, made primarily of carbon (with an unknown amount of oxygen), and is very dense, it may be similar to a very large diamond. In the science press, the object has been called the [[Carbon planet|"Diamond Planet"]]<ref name=UniverseToday>{{cite web|title=Star Transforms Into A Diamond Planet|url=http://www.universetoday.com/88449/star-transforms-into-a-diamond-planet|work=Universe Today|accessdate=8/26/2011}}</ref><ref name=Space.com>{{cite web|title=Surprise! Alien Planet Made of Diamond Discovered|url=http://www.space.com/12731-diamond-alien-planet-discovered-neutron-star.html|work=Space.com|accessdate=8/25/2011}}</ref><ref name= MaxPlanck>{{cite web|title=A Planet made of Diamond|url=http://www.mpifr-bonn.mpg.de/public/pr/pr-pulsar-august2011-en.html|work=Max Planck Institut for Radio Astronomy|accessdate=8/26/2011}}</ref>.
Because the companion to PSR J1719-1438 is planet sized, made primarily of carbon (with an unknown amount of oxygen), and is very dense, it may be similar to a very large diamond. In the science press, the object has been called the [[Carbon planet|"Diamond Planet"]]<ref name=UniverseToday>{{cite web|title=Star Transforms Into A Diamond Planet|url=http://www.universetoday.com/88449/star-transforms-into-a-diamond-planet|work=Universe Today|accessdate=8/26/2011}}</ref><ref name=Space.com>{{cite web|title=Surprise! Alien Planet Made of Diamond Discovered|url=http://www.space.com/12731-diamond-alien-planet-discovered-neutron-star.html|work=Space.com|accessdate=8/25/2011}}</ref><ref name= MaxPlanck>{{cite web|title=A Planet made of Diamond|url=http://www.mpifr-bonn.mpg.de/public/pr/pr-pulsar-august2011-en.html|work=Max Planck Institut for Radio Astronomy|accessdate=8/26/2011}}</ref>.

Revision as of 20:32, 20 December 2011

PSR J1719-1438

Observation data
Epoch MJD 55411.0[1]      Equinox J2000
Constellation Serpens
Right ascension 17:19:10.0730(1)[1]
Declination −14:38:00.96(2)[1]
Characteristics
Spectral type millisecond pulsar[1]
Apparent magnitude (R) >25.4[1]
Apparent magnitude (g) >24.1[1]
Apparent magnitude (I) >22.5[1]
Astrometry
Distance~1,200[1] pc
Orbit[1]
PrimaryPSR J1719-1438
CompanionPSR J1719-1438b
Period (P)0.090706293(2) days
Semi-major axis (a)0.001819(1) light seconds
Eccentricity (e)<0.06
Periastron epoch (T)MJD 55411.0
Details
Other designations
Database references

PSR J1719-1438 is a millisecond pulsar with a spin period of 5.7 ms located about 4000 ly from Earth in the direction of Serpens Cauda,[1][2] approximately one minute from the border with Ophiuchus. Millisecond pulsars are generally thought to begin as normal pulsars and then spin up by accreting matter from a binary companion.

Diamond planet

Main article: PSR J1719-1438 b

PSR J1719-1438 was discovered in 2011 by the High Time Resolution Survey, a radio astronomy search for astronomical objects which rapidly vary in radio brightness, such as pulsars.[1] Timing measurements using the Parkes Telescope and Lovell Telescope showed that it has a low-mass companion: PSR J1719-1438 b.[1] The companion has a mass similar to that of Jupiter, but at about 40% of the diameter. It orbits the pulsar with a period of 2 hours 10 minutes and 37 seconds, at a distance of around 600,000 km (0.89 solar radii).[1] The companion is likely the remnant of a star whose outer layers were siphoned off by the more massive pulsar. Calculations show the companion has a minimum density of 23 grams per cubic centimeter and is probably an ultra-low mass carbon-oxygen white dwarf.[1]

Because the companion to PSR J1719-1438 is planet sized, made primarily of carbon (with an unknown amount of oxygen), and is very dense, it may be similar to a very large diamond. In the science press, the object has been called the "Diamond Planet"[2][3][4].

See also

  • EF Eridani, a star system with a compact star and a degraded planetary-mass former star

References

  1. ^ a b c d e f g h i j k l m n Bailes, M.; Bates, S. D.; Bhalerao, V.; Bhat, N. D. R.; Burgay, M.; Burke-Spolaor, S.; d'Amico, N.; Johnston, S.; Keith, M. J. (2011). "Transformation of a Star into a Planet in a Millisecond Pulsar Binary". Science. Bibcode:2011Sci...333.1717B. doi:10.1126/science.1208890.
  2. ^ a b "Star Transforms Into A Diamond Planet". Universe Today. Retrieved 8/26/2011. {{cite web}}: Check date values in: |accessdate= (help)
  3. ^ "Surprise! Alien Planet Made of Diamond Discovered". Space.com. Retrieved 8/25/2011. {{cite web}}: Check date values in: |accessdate= (help)
  4. ^ "A Planet made of Diamond". Max Planck Institut for Radio Astronomy. Retrieved 8/26/2011. {{cite web}}: Check date values in: |accessdate= (help)
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