TYC 9486-927-1

TYC 9486-927-1 (also known as 2MASS J21252752-8138278) is a star located at a distance of 26.7 (+5.7, -4.7) parsecs from Earth in the southern direction in the constellation of Octans. It is a dwarf (luminosity class V) red (spectral class M1) variable by rotation.

TYC 9486-927-1 1
Observation data
Epoch       Equinox
Constellation Octans
Right ascension  21h 25m 27.4899s[1]
Declination –81° 38′ 27.673″[1]
Apparent magnitude (V) 11.821[1]
Characteristics
Spectral type M1 V[2]
Astrometry
Radial velocity (Rv)8.7 ± 4.6[2] km/s
Distance26.7+5.7
−4.7[3] pc
Details
Mass0.4[3] M☉
Temperature3,490[3] K
Rotational velocity (v sin i)43.5 ± 1.2[3] km/s
Age10-45[3] Myr
Other designations
2MASS J21252752-8138278
Database references
SIMBADdata

The star is the primary object of a planetary system having the secondary object 2MASS J21265040-8140293. This substellar object, being an exoplanet, is the most extensive planetary system known to date.

TYC 9486-927-1 has rapid rotation and coronal and chromospheric activity suggestive of a young age. Observations and multi-epoch radial velocity data suggest that TYC 9486-927-1 is a single, rapidly rotating star rather than a spectroscopic or tight, visual binary. However, it is still possible that TYC 9486-927-1 is an equal mass binary with a face-on orbit and close separation.[2]

2MASS J21265040-8140293

2MASS J21265040-8140293 orbits TYC 9486-927-1 at a distance of 4500 AU . With a mass from 11.6 to 15 Jupiter masses, it is considered to be either a star, a brown dwarf, or a giant planet.[4][5]

References
  1. Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2012). "VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012)". VizieR On-line Data Catalog: I/322A. Originally Published in: 2012yCat.1322....0Z; 2013AJ....145...44Z. 1322. Bibcode:2012yCat.1322....0Z.
  2. Torres, C. A. O.; Quast, G. R.; Da Silva, L.; de la Reza, R.; Melo, C. H. F.; Sterzik, M. (2006). "Search for associations containing young stars (SACY). I. Sample and searching method". Astronomy and Astrophysics. 460 (3): 695. arXiv:astro-ph/0609258. Bibcode:2006A&A...460..695T. doi:10.1051/0004-6361:20065602.
  3. Deacon, N. R.; Schlieder, J. E.; Murphy, S. J. (2016). "A nearby young M dwarf with a wide, possibly planetary-mass companion". Monthly Notices of the Royal Astronomical Society. 457 (3): 3191. arXiv:1601.06162. Bibcode:2016MNRAS.457.3191D. doi:10.1093/mnras/stw172.
  4. Gagné, Jonathan; Lafrenière, David; Doyon, René; Malo, Lison; Artigau, Étienne (2014). "BANYAN. II. Very Low Mass and Substellar Candidate Members to Nearby, Young Kinematic Groups with Previously Known Signs of Youth". The Astrophysical Journal. 783 (2): 121. arXiv:1312.5864. Bibcode:2014ApJ...783..121G. doi:10.1088/0004-637X/783/2/121.
  5. Reid, I. Neill; Cruz, Kelle L.; Kirkpatrick, J. Davy; Allen, Peter R.; Mungall, F.; Liebert, James; Lowrance, Patrick; Sweet, Anne (2008). "Meeting the Cool Neighbors. X. Ultracool Dwarfs from the 2MASS All-Sky Data Release". The Astronomical Journal. 136 (3): 1290. arXiv:0806.3413. Bibcode:2008AJ....136.1290R. doi:10.1088/0004-6256/136/3/1290.
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