2MASS J01225093−2439505

2MASS J01225093−2439505 is a M-type main-sequence star. Its surface temperature is 3530±50 K. 2MASS J01225093−2439505 is much younger than the Sun at an age of 0.12 billion years. Kinematically, the star belongs to the AB Doradus moving group.^[6]

2MASS J01225093−2439505

Observation data Epoch J2000      Equinox J2000
Constellation	Cetus
Right ascension	01h 22m 50.9353s[1]
Declination	−24° 39′ 50.6933″[1]
Apparent magnitude (V)	14.24±0.07[1]
Characteristics
Evolutionary stage	main-sequence star
Spectral type	M3.5V[2]
Astrometry
Proper motion (μ)	RA: 120.215[3] mas/yr Dec.: −123.561[3] mas/yr
Parallax (π)	29.6409 ± 0.0273 mas[3]
Distance	110.0 ± 0.1 ly (33.74 ± 0.03 pc)
Details
Mass	0.4[4] M☉
Luminosity	0.019[2] L☉
Temperature	3530±50[2] K
Rotation	1.49±0.02 d[5]
Age	0.12[citation needed] Gyr
Other designations
Gaia DR2 5040416186560252416, TIC 11614485, 2MASS J01225093−2439505[1]
Database references
SIMBAD	data

Multiplicity surveys did not detect any stellar companions to 2MASS J01225093−2439505 as of 2016.^[7]

Planetary system

In 2013, one superjovian planet (may be a brown dwarf),^[5] named 2MASS J01225093−2439505 b, was discovered by direct imaging.^[2] The measured planetary temperature is 1600±100 K,^[4] and it exhibits an unusual, short-lived atmospheric dust type due to its relatively low surface gravity and young age.^[2] The planetary spectrum is classified as L3.7±1.0.^[4] The planetary rotation axis is inclined to its orbit, obliquity is 33⁺¹⁷
₋₉°, while the orbit is well aligned with the equatorial plane of the star, misalignment is 1⁺²⁸
₋₁°. The planet is rotating rapidly, with a period of 6.8±1.8 hours.^[5]

The 2MASS J01225093−2439505 planetary system^[4]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	19.5±7.5 MJ	50	—	—	103+16 −6[5]°	1.04±0.18[5] RJ

References

1. "LEHPM 1481". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-08.
2. Bowler, Brendan P.; Liu, Michael C.; Shkolnik, Evgenya L.; Dupuy, Trent J. (2013). "Planets Around Low-Mass Stars. III. A Young Dusty L Dwarf Companion at the Deuterium-Burning Limit". The Astrophysical Journal. 774 (1): 55. arXiv:1307.2237. Bibcode:2013ApJ...774...55B. doi:10.1088/0004-637X/774/1/55. S2CID 119107288.
3. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
4. Hinkley, Sasha; Bowler, Brendan P.; Vigan, Arthur; Aller, Kimberly M.; Liu, Michael C.; Mawet, Dimitri; Matthews, Elisabeth; Wahhaj, Zahed; Kraus, Stefan; Baraffe, Isabelle; Chabrier, Gilles (2015). "Early Results from VLT Sphere: Long-Slit Spectroscopy of 2Mass 0122–2439 B, A Young Companion Near the Deuterium Burning Limit". The Astrophysical Journal. 805 (1): L10. arXiv:1504.07240. Bibcode:2015ApJ...805L..10H. doi:10.1088/2041-8205/805/1/L10. S2CID 20992122.
5. Bryan, Marta L.; Chiang, Eugene; Bowler, Brendan P.; Morley, Caroline V.; Millholland, Sarah; Blunt, Sarah; Ashok, Katelyn B.; Nielsen, Eric; Ngo, Henry; Mawet, Dimitri; Knutson, Heather A. (2020). "Obliquity Constraints on an Extrasolar Planetary-mass Companion". The Astronomical Journal. 159 (4): 181. arXiv:2002.11131. Bibcode:2020AJ....159..181B. doi:10.3847/1538-3881/ab76c6. S2CID 211505793.
6. Zhou, Yifan; Apai, Dániel; Lew, Ben W. P.; Schneider, Glenn; Manjavacas, Elena; Bedin, Luigi R.; Cowan, Nicolas B.; Marley, Mark S.; Radigan, Jacqueline; Karalidi, Theodora; Lowrance, Patrick J.; Miles-Páez, Paulo A.; Metchev, Stanimir; Burgasser, Adam J. (2019). "Cloud Atlas: High-contrast Time-resolved Observations of Planetary-mass Companions". The Astronomical Journal. 157 (3): 128. arXiv:1902.00085. Bibcode:2019AJ....157..128Z. doi:10.3847/1538-3881/ab037f. S2CID 119074052.
7. Bryan, Marta L.; Bowler, Brendan P.; Knutson, Heather A.; Kraus, Adam L.; Hinkley, Sasha; Mawet, Dimitri; Nielsen, Eric L.; Blunt, Sarah C. (2016). "Searching for Scatterers: High-Contrast Imaging of Young Stars Hosting Wide-Separation Planetary-Mass Companions". The Astrophysical Journal. 827 (2): 100. arXiv:1606.06744. Bibcode:2016ApJ...827..100B. doi:10.3847/0004-637X/827/2/100. S2CID 8681056.