 COCONUTS-2b with
unWISE. The planet in the center of the image stands out due to its red color. The host star is not pictured here. | |
| Discovery | |
|---|---|
| Discovered by | Zhoujian Zhang Michael Liu Zach Claytor William Best Trent Dupuy Robert Siverd [1] |
| Discovery date | August 2011
[2] July 2021 [3] |
| Direct imaging | |
| Designations | |
| WISEPA J075108.79-763449.6 [2] | |
| Orbital characteristics | |
| 7,506.0 AU (1.12288×1012 km) [4] or ~0.1185 ly (~0.03633 pc) | |
| 1101369.9 years [4] | |
| Star | L 34-26 |
| Physical characteristics | |
Mean radius | 1.12±0.04 RJ [5] |
| Mass | 6.3+1.5 −1.9 MJ [6] [4] |
| 4.11+0.11 −0.18 dex [6] | |
| Temperature | 434 ± 9 K [6] |
Spectral type | T9 |
COCONUTS-2 b, or WISEPA J075108.79-763449.6, is a gas giant exoplanet that orbits the M-type star L 34-26. With a mass of 6.3 Jupiters, it takes over one million years to complete one orbit around the star orbiting 7,506 AU away from it. [1]
The planet was discovered in 2011 and was initially identified as a T9 free-floating brown dwarf WISEPA J075108.79−763449.6. [2] During the COol Companions ON Ultrawide orbiTS (COCONUTS) survey, its association with L 34-26 was announced in 2021. [7] At a distance of 10.9 pc, COCONUTS-2b is the closest directly imaged exoplanet to Earth known to date. [8]
The researchers found that it is unlikely that COCONUTS-2b was formed inside the protoplanetary disk of the host star and it is more likely that the planet formed on its own via high entropy formation (aka hot-start process). [6] [9]
Atmosphere
The planet has a spectral type of T9, based on a low signal-to-noise near-infrared spectrum with Magellan/FIRE. [2] [6] This spectral type suggests high amounts of methane, water vapor and low amounts of carbon monoxide in the atmosphere of COCONUTS-2b.
COCONUTS-2b might have both clouds and a non-equilibrium process in its atmosphere. [6]
Due to its large orbital separation, COCONUTS-2b is a great laboratory to study the atmosphere and composition of young gas-giant exoplanets. [3] Astronomers estimate the planet’s temperature to be around 434 K (161 °C; 322 °F). [6]
Host star
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 07h 49m 12.71s |
| Declination | +76° 42′ 02.5″ |
| Apparent magnitude (V) | 11.3 [10] |
| Characteristics | |
| Evolutionary stage | Red dwarf |
| Spectral type | M3V [11] |
| Astrometry | |
| Radial velocity (Rv) | 1.19 [12] km/s |
| Proper motion (μ) |
RA: -102.154
mas/
yr
[12] Dec.: -192.918 mas/ yr [12] |
| Parallax (π) | 91.8263 mas [12] |
| Distance | 35.5±0.0065
[6]
ly (10.89±0.002 pc) |
| Details | |
| Mass | 0.37±0.02 [6] M☉ |
| Radius | 0.388±0.11 [6] R☉ |
| Temperature | 3,406±69 [6] K |
| Age | 475±325 [6] Myr |
| Other designations | |
L 34-26, COCONUTS-2A, WISEPA J075108.79-763449.6, 1RXS J074912.9-764202, 2MASS J07491271-7642065, ASAS J074912-7641.9, Gaia DR1 5213167326052013184, Gaia DR2 5213167330349528064, Gaia DR3 5213167330349528064, NLTT 18592
PM J07492-7642,RAVE J074912.7-764207, TIC 272232401, TYC 9381-1809-1, UCAC4 067-006518, USNO-B1.0 0132-00043434 | |
| Database references | |
| SIMBAD | data |
L 34-26, also known as COCONUTS-2A and TYC 9381-1809-1, is a M3-type dwarf star located 35 light-years away, in the constellation of Chamaeleon. The star is about one-third the mass of the Sun, with an age between 150 and 800 million years old. [13]
Researchers using TESS found that L 34-26 showed stellar flares about every 0.48 days. It was the most active planet hosting star in their sample. The team studying the host star also found that L 34-26 is fast rotating with a rotation period of 2.83 days. The planet should not be influenced by the flares, because of the large orbital separation. [14]
Gallery
-
The COCONUTS-2 system with unWISE -
The planet COCONUTS-2b with Gemini-South -
Allwise image by the discoverers, showing planet COCONUTS-2b
References
- ^ a b "Massive COCONUTS exoplanet discovery led by UH grad student | University of Hawaiʻi System News". University of Hawaiʻi News. University of Hawaiʻi at Mānoa. Archived from the original on 15 December 2021. Retrieved 21 December 2021.
- ^ a b c d Kirkpatrick, J. Davy; Cushing, Michael C.; Gelino, Christopher R.; Griffith, Roger L.; Skrutskie, Michael F.; Marsh, Kenneth A.; Wright, Edward L.; Mainzer, A.; Eisenhardt, Peter R.; McLean, Ian S.; Thompson, Maggie A.; Bauer, James M.; Benford, Dominic J.; Bridge, Carrie R.; Lake, Sean E. (2011-12-01). "The First Hundred Brown Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)". The Astrophysical Journal Supplement Series. 197 (2): 19. arXiv: 1108.4677. Bibcode: 2011ApJS..197...19K. doi: 10.1088/0067-0049/197/2/19. ISSN 0067-0049. S2CID 16850733.
- ^ a b Kooser, Amanda. "Massive exoplanet 'Coconuts-2b' could help reveal the secrets of young gas giants". CNET. Archived from the original on 21 December 2021. Retrieved 21 December 2021.
- ^ a b c "COCONUTS-2 b". Exoplanet Exploration: Planets Beyond our Solar System. National Aeronautics and Space Administration. Archived from the original on 22 November 2021. Retrieved 21 December 2021.
- ^ "COCONUTS-2". Open Exoplanet Catalogue. Archived from the original on 21 December 2021. Retrieved 21 December 2021.
- ^ a b c d e f g h i j k l Zhang, Zhoujian; Liu, Michael C.; Claytor, Zachary R.; Best, William M. J.; Dupuy, Trent J.; Siverd, Robert J. (2021-08-01). "The Second Discovery from the COCONUTS Program: A Cold Wide-orbit Exoplanet around a Young Field M Dwarf at 10.9 pc". The Astrophysical Journal. 916 (2): L11. arXiv: 2107.02805. Bibcode: 2021ApJ...916L..11Z. doi: 10.3847/2041-8213/ac1123. ISSN 0004-637X.
- ^ "Exoplanet-catalog". Exoplanet Exploration: Planets Beyond our Solar System. Archived from the original on 2021-11-22. Retrieved 2021-11-22.
- ^ Siegel, Ethan. "Astronomers Go Nuts For Closest Exoplanet Directly Imaged Ever: COCONUTS-2b". Forbes. Archived from the original on 2021-11-22. Retrieved 2021-11-22.
- ^ Marley, Mark S.; Fortney, Jonathan J.; Hubickyj, Olenka; Bodenheimer, Peter; Lissauer, Jack J. (2007-01-01). "On the Luminosity of Young Jupiters". The Astrophysical Journal. 655 (1): 541–549. arXiv: astro-ph/0609739. Bibcode: 2007ApJ...655..541M. doi: 10.1086/509759. ISSN 0004-637X. S2CID 7793365.
- ^ Martin, Pierre-Yves (2021). "Planet COCONUTS-2 b". Extrasolar Planets Encyclopaedia. Retrieved 2023-11-28.
- ^ Martin, Pierre-Yves (2021). "Planet COCONUTS-2 b". Extrasolar Planets Encyclopaedia. Retrieved 2023-11-28.
- ^ a b c "Simbad - Object view". simbad.cds.unistra.fr. Retrieved 2023-11-28.
- ^ "Giant Exoplanet Orbits Its Host Star Once Every 1.1 Million Years | Astronomy | Sci-News.com". Breaking Science News | Sci-News.com. Archived from the original on 2021-11-22. Retrieved 2021-11-22.
- ^ Stelzer, B.; Bogner, M.; Magaudda, E.; Raetz, St. (2022). "Flares and rotation of M dwarfs with habitable zones accessible to TESS planet detections". Astronomy and Astrophysics. 665: A30. arXiv: 2207.03794. Bibcode: 2022A&A...665A..30S. doi: 10.1051/0004-6361/202142088. S2CID 249662585.
