Astronomy:PSR J0337+1715
Coordinates: 
03h 37m 43.82589s, +17° 15′ 14.8280″
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Taurus |
| Right ascension | 03h 37m 43.82589s |
| Declination | +17° 15′ 14.8280″ |
| Characteristics | |
| Spectral type | Pulsar |
| Details | |
| Other designations | |
PSR J0337+1715 | |
| Database references | |
| SIMBAD | data |
PSR J0337+1715 is a millisecond pulsar discovered in a Green Bank Telescope drift-scan survey from 2007. It is spinning nearly 366 times per second, 4200 light years away in the constellation Taurus. It is the first pulsar found in a stellar triple system. It is co-orbiting very closely with another star, a 0.2 solar-mass white dwarf, with a period of 1.6 days. There is a second white dwarf further out (within one astronomical unit) which is orbiting both the pulsar and the inner white dwarf, and has an orbit with a period of 327 days and a mass of 0.4 solar masses.[1][2] The fact that the pulsar is part of a triple system provides an opportunity to test the nature of gravity and the strong equivalence principle, with a sensitivity several orders of magnitude greater than before.[3][4][5]
Results were published in 2018 showing that if there is any departure from the equivalence principle it is no more than three parts per million[2][6][7] at 95% confidence level, improved to two parts per million in 2020.[8]
Planetary system
In 2022 evidence for a small planet on a wide orbit was found.[9]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| PSR J0337+1715 (AB) b (unconfirmed) | 0.01-0.03 M⊕ | — | ~ 3000 days | — | — | — |
References
- ↑ "Einstein's theory of relativity passes its toughest test yet". 5 July 2018. https://www.nbcnews.com/mach/science/einstein-s-theory-relativity-passes-its-toughest-test-yet-ncna889021.
- ↑ 2.0 2.1 Anne, Archibald (Jul 4, 2018). "Universality of free fall from the orbital motion of a pulsar in a stellar triple system". Nature 559 (7712): 73–76. doi:10.1038/s41586-018-0265-1. PMID 29973733. Bibcode: 2018Natur.559...73A.
- ↑ "Triple-Star System Can Give Clues to True Nature of Gravity | Astronomy | Sci-News.com" (in en-US). Breaking Science News | Sci-News.com. http://www.sci-news.com/astronomy/science-triple-star-nature-gravity-01664.html.
- ↑ "Bold Experiments Will Put General Relativity to the Test | DiscoverMagazine.com". Discover Magazine. http://discovermagazine.com/2015/april/13-defying-gravity.
- ↑ Ransom, S. M.; Stairs, I. H.; Archibald, A. M.; Hessels, J. W. T.; Kaplan, D. L.; van Kerkwijk, M. H.; Boyles, J.; Deller, A. T. et al. (2014-01-01). "A millisecond pulsar in a stellar triple system". Nature 505 (7484): 520–524. doi:10.1038/nature12917. ISSN 0028-0836. PMID 24390352. Bibcode: 2014Natur.505..520R.
- ↑ Leah Crane (Jul 7, 2018). "Einstein's theory passes triple-star test". New Scientist 239 (3185): 9. doi:10.1016/S0262-4079(18)31185-0. Bibcode: 2018NewSc.239....9C. https://www.newscientist.com/article/mg23931853-900-trio-of-stars-shows-einstein-is-still-right-about-relativity/.
- ↑ "Scientists Test Einstein's Theory of Gravity on Unique Triple-Star System". Jul 5, 2018. http://www.sci-news.com/astronomy/einsteins-theory-gravity-triple-star-system-06170.html.
- ↑ Voisin, G.; Cognard, I.; Freire, P. C. C.; Wex, N.; Guillemot, L.; Desvignes, G.; Kramer, M.; Theureau, G. (2020-06-01). "An improved test of the strong equivalence principle with the pulsar in a triple star system" (in en). Astronomy & Astrophysics 638: A24. doi:10.1051/0004-6361/202038104. ISSN 0004-6361. Bibcode: 2020A&A...638A..24V. https://www.aanda.org/articles/aa/abs/2020/06/aa38104-20/aa38104-20.html.
- ↑ Voisin, Guillaume; Luth, G.; Cognard, I.; Freire, P.; Wex, N.; Guillemot, L.; Desvignes, G.; Kramer, M.; Theureau, G.; Saillenfest, M. (2022). "One pulsar, two white dwarfs, and a planet confirming the strong equivalence principle". arXiv:2205.09345 [astro-ph.HE]. [1]
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