Astronomy:2MASS J01225093−2439505
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[3] mas |
| 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 | |
| Database references | |
| SIMBAD | data |
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]
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]
| 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
- ↑ 1.0 1.1 1.2 1.3 "LEHPM 1481". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=LEHPM+1481.
- ↑ 2.0 2.1 2.2 2.3 2.4 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. doi:10.1088/0004-637X/774/1/55. Bibcode: 2013ApJ...774...55B.
- ↑ 3.0 3.1 3.2 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 4.0 4.1 4.2 4.3 Hinkley, Sasha; Bowler, Brendan P.; Vigan, Arthur; Aller, Kimberly M.; Liu, Michael C.; Mawet, Dimitri; Matthews, Elisabeth; Wahhaj, Zahed et al. (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. doi:10.1088/2041-8205/805/1/L10. Bibcode: 2015ApJ...805L..10H.
- ↑ 5.0 5.1 5.2 5.3 5.4 Bryan, Marta L.; Chiang, Eugene; Bowler, Brendan P.; Morley, Caroline V.; Millholland, Sarah; Blunt, Sarah; Ashok, Katelyn B.; Nielsen, Eric et al. (2020). "Obliquity Constraints on an Extrasolar Planetary-mass Companion". The Astronomical Journal 159 (4): 181. doi:10.3847/1538-3881/ab76c6. Bibcode: 2020AJ....159..181B.
- ↑ Zhou, Yifan; Apai, Dániel; Lew, Ben W. P.; Schneider, Glenn; Manjavacas, Elena; Bedin, Luigi R.; Cowan, Nicolas B.; Marley, Mark S. et al. (2019). "Cloud Atlas: High-contrast Time-resolved Observations of Planetary-mass Companions". The Astronomical Journal 157 (3): 128. doi:10.3847/1538-3881/ab037f. Bibcode: 2019AJ....157..128Z.
- ↑ 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. doi:10.3847/0004-637X/827/2/100. Bibcode: 2016ApJ...827..100B.
Coordinates: 
12h 42m 28.4949s, −30° 38′ 23.5276″
 |  |
