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ROXs 12 
Summary
ROXs 12 is a binary system of pre-main-sequence stars. It belongs to the Rho Ophiuchi cloud complex.[4] The surface temperature of the primary star is 3900±100 K.[3] ROXs 12 is much younger than the Sun with an age of 7.6+4.1
−2.5 million years.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 26m 28.0400s[1] |
| Declination | −25° 26′ 47.7168″[1] |
| Apparent magnitude (V) | 14.29 |
| Characteristics | |
| Evolutionary stage | pre-main-sequence star |
| Spectral type | M0e[1] |
| Astrometry | |
| Proper motion (μ) | RA: -6.858[2] mas/yr Dec.: -24.815[2] mas/yr |
| Parallax (π) | 7.2170 ± 0.0172 mas[2] |
| Distance | 452 ± 1 ly (138.6 ± 0.3 pc) |
| Details[3] | |
| ROXs 12 | |
| Mass | 0.65+0.05 −0.09 M☉ |
| Radius | 1.14±0.07 R☉ |
| Temperature | 3900±100 K |
| Rotation | 9.1±0.4 d |
| Age | 7.6+4.1 −2.5 Myr |
| 2MASS J16262774–2527247 | |
| Mass | 0.535+0.006 −0.007 M☉ |
| Radius | 1.17+0.06 −0.04 R☉ |
| Luminosity | 0.24+0.05 −0.04 L☉ |
| Surface gravity (log g) | 3.6+0.6 −0.7 cgs |
| Temperature | 3746+139 −122 K |
| Other designations | |
| ROXs 12: 2MASS J16262803-2526477, DENIS J162628.0-252647 | |
| 2MASS J16262774–2527247: DENIS J162627.7-252724 | |
| Database references | |
| SIMBAD | ROXs 12 |
| ROXs 12b | |
| 2MASS J16262774–2527247 | |
A multiplicity survey detected a stellar companion to ROXs 12 in 2017, named 2MASS J16262774–2527247,[5] at a projected separation of 5100 AU.[6]
Planetary system edit
In 2005, one planet was discovered on a wide orbit by direct imaging,[7] was confirmed in 2013 and named ROXs 12 b.[4] The planet's measured temperature is 3100+400
−500 K.[6]
The primary star is surrounded by a protoplanetary disk, although it is not very massive, being less than 4 MJ.[4] The secondary star also has a protoplanetary disk, and it is much more massive, equal to 10-1.07+0.49
−0.87M☉. The disk is inclined to the equatorial plane of the star.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| Protoplanetary or debris disk | ? AU | — | — | |||
| b | 16±4 MJ | 210±20 | — | ~0 | — | — |
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| Protoplanetary disk | 4.1–25.8[5] AU | — | — | |||
References edit
- ^ a b c d "ROXs 12". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-18.
- ^ a b c 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.
- ^ a b Bowler, Brendan P.; Kraus, Adam L.; Bryan, Marta L.; Knutson, Heather A.; Brogi, Matteo; Rizzuto, Aaron C.; Mace, Gregory N.; Vanderburg, Andrew; Liu, Michael C.; Hillenbrand, Lynne A.; Cieza, Lucas A. (2017), "The young substellar companion ROXs 12 B: near-infrared spectrum, system architecture, and spin-orbit misalignment", The Astronomical Journal, 154 (4): 165, arXiv:1708.07611, Bibcode:2017AJ....154..165B, doi:10.3847/1538-3881/aa88bd, S2CID 119187671
- ^ a b c d Kraus, Adam L.; Ireland, Michael J.; Cieza, Lucas A.; Hinkley, Sasha; Dupuy, Trent J.; Bowler, Brendan P.; Liu, Michael C. (2013), "Three Wide Planetary-Mass Companions to FW Tau, ROXs 12, and ROXs 42B", The Astrophysical Journal, 781: 20, arXiv:1311.7664, Bibcode:2014ApJ...781...20K, doi:10.1088/0004-637X/781/1/20, S2CID 41086512
- ^ a b c d e Sheehan, Patrick D.; Wu, Ya-Lin; Eisner, Josh A.; Tobin, John J. (2019), "High Precision Dynamical Masses of Pre-Main Sequence Stars with ALMA and Gaia", The Astrophysical Journal, 874 (2): 136, arXiv:1903.00032, Bibcode:2019ApJ...874..136S, doi:10.3847/1538-4357/ab09f9, S2CID 119218828
- ^ a b Wu, Ya-Lin; Bowler, Brendan P.; Sheehan, Patrick D.; Andrews, Sean M.; Herczeg, Gregory J.; Kraus, Adam L.; Ricci, Luca; Wilner, David J.; Zhu, Zhaohuan (2020), "ALMA 0.88 mm survey of disks around planetary-mass companions", The Astronomical Journal, 159 (5): 229, arXiv:2003.08658, Bibcode:2020AJ....159..229W, doi:10.3847/1538-3881/ab818c, S2CID 213004809
- ^ Ratzka, T.; Köhler, R.; Leinert, Ch. (2005), "A Multiplicity Survey of the Rho Ophiuchi Molecular Clouds", Astronomy & Astrophysics, 437 (2): 611–626, arXiv:astro-ph/0504593, Bibcode:2005A&A...437..611R, doi:10.1051/0004-6361:20042107, S2CID 119464112