1RXS J160929.1−210524: Difference between revisions
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| image = [[File:1RXS J160929.1- |
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| caption = The star and its ~8 x [[Jupiter]] mass [[Exoplanet|planetary]] companion |
| caption = The star and its ~8 x [[Jupiter]] mass [[Exoplanet|planetary]] companion |
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'''1RXS J160929.1- |
'''1RXS J160929.1-220624''' is a [[pre-main sequence star]] approximately 470 [[light-year]]s away in the [[constellation]] of [[Scorpius (constellation)|Scorpius]]. The [[star]] was identified as a 5 million year-old member of the Upper [[Scorpius]] subgroup of the [[Scorpius-Centaurus Association]] by Thomas Preibisch and coauthors in 1998. |
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== Planetary system == |
== Planetary system == |
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Revision as of 02:46, 2 July 2010
File:1RXS J160929.1-220564 b.jpg The star and its ~8 x Jupiter mass planetary companion Credit: Gemini Observatory | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 09m 30.3s[1] |
| Declination | −21° 04′ 58″[1] |
| Characteristics | |
| Spectral type | K7V[2] |
| Variable type | T Tauri star |
| Astrometry | |
| Distance | 470 ± 70 ly (145 ± 20[3] pc) |
| Details | |
| Mass | 0.85+0.20 −0.10[2] M☉ |
| Radius | 1.35[2] R☉ |
| Temperature | 4060+300 −200[2] K |
| Age | 5 million[3] years |
| Other designations | |
| Database references | |
| SIMBAD | data |
1RXS J160929.1-220624 is a pre-main sequence star approximately 470 light-years away in the constellation of Scorpius. The star was identified as a 5 million year-old member of the Upper Scorpius subgroup of the Scorpius-Centaurus Association by Thomas Preibisch and coauthors in 1998.
Planetary system
On 8 September 2008, it was announced that astronomer David Lafrenière and collaborators used the Gemini Observatory to take pictures of the star which appeared to show a planet (designated 1RXS J160929.1-210524 b), about eight times the mass of Jupiter,[4] orbiting the star at a great distance, some 330 times the distance that the Earth orbits the Sun (approximately 50 billion kilometres, or 31 billion miles; in comparison, Pluto orbits the Sun at an average distance of 5.8 billion km (3.6 billion mi).).[5] The orbital status of the companion planet was confirmed in a paper submitted on 15 June 2010 to the The Astrophysical Journal.[6][7] This makes it the smallest known exoplanet orbiting its host at such a distance. It is also the first directly imaged exoplanet orbiting a sun-like star.[4]
The discoverers note that the object's location far from its star presents serious challenges to current models of planetary formation: the timescale to form a planet by core accretion at this distance from the star would be longer than the age of the system itself. One possibility is that the planet may have formed closer to the star and migrated outwards as a result of interactions with the disk or with other planets in the system. An alternative is that the planet formed in situ via the disk instability mechanism, where the disk fragments due to gravitational instability, though this would require an unusually massive protoplanetary disk.[2]
| Companion | Mass | Observed separation (AU) |
| b | 8+4 −1[2] MJ | ~330[2] |
See also
References
- ^ a b GSC 06213-01358 -- Pre-main sequence Star (optically detected), database entry, SIMBAD. Accessed on line September 17, 2008.
- ^ a b c d e f g Table 1, Direct Imaging and Spectroscopy of a Planetary Mass Candidate Companion to a Young Solar Analog, David Lafrenière, Ray Jayawardhana, and Marten H. van Kerkwijk, submitted to Astrophysical Journal Letters, arXiv:0809.1424, Bibcode:2008arXiv0809.1424L.
- ^ a b p. 1, Lafrenière et al. 2008.
- ^ a b Fazekas, Andrew (June 30, 2010). ""First" Picture of Planet Orbiting Sunlike Star Confirmed". National Geographic. Retrieved July 1, 2010.
- ^ "Exoplanet 'circles normal star'". BBC News. September 15, 2008. Retrieved September 17, 2008.
- ^ Lafrenière, David; Jayawardhana, Ray; van Kerkwijk, Marten H. (2010). "The Directly Imaged Planet around the Young Solar Analog 1RXS J160929.1-210524: Confirmation of Common Proper Motion, Temperature and Mass". v1. arXiv:1006.3070 [astro-ph.EP].
{{cite arXiv}}: Unknown parameter|accessdate=ignored (help) - ^ Kruesi, Liz (June 22, 2010). "Astronomers verify directly imaged planet". Astronomy Magazine. Retrieved July 1, 2010.
External links
- "First Picture of Likely Planet around Sun-like Star". Gemini Observatory. 2008-09-15. Retrieved 2008-09-16.
- Lafrenière, David; Jayawardhana, Ray; van Kerkwijk, Marten H. (2008). "Direct Imaging and Spectroscopy of a Planetary Mass Candidate Companion to a Young Solar Analog". ARXIV. doi:2008arXiv0809.1424L.
{{cite journal}}: Check|doi=value (help)CS1 maint: multiple names: authors list (link) - "Notes for star 1RXS1609". The Extrasolar Planet Encyclopedia. Retrieved 2008-09-16.