Astronomy:ROXs 12
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[2] mas |
| 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: {{{names1}}} | |
| 2MASS J16262774–2527247: {{{names2}}} | |
| Database references | |
| SIMBAD | ROXs 12 |
| ROXs 12b | |
| 2MASS J16262774–2527247 | |
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]
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
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 | — | — | |||
| ROXs 12 b (fr) | 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
- ↑ 1.0 1.1 1.2 1.3 "ROXs 12". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ROXs+12.
- ↑ 2.0 2.1 2.2 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.
- ↑ 3.0 3.1 Bowler, Brendan P.; Kraus, Adam L.; Bryan, Marta L.; Knutson, Heather A.; Brogi, Matteo; Rizzuto, Aaron C.; Mace, Gregory N.; Vanderburg, Andrew et al. (2017), "The young substellar companion ROXs 12 B: near-infrared spectrum, system architecture, and spin-orbit misalignment", The Astronomical Journal 154 (4): 165, doi:10.3847/1538-3881/aa88bd, Bibcode: 2017AJ....154..165B
- ↑ 4.0 4.1 4.2 4.3 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, doi:10.1088/0004-637X/781/1/20, Bibcode: 2014ApJ...781...20K
- ↑ 5.0 5.1 5.2 5.3 5.4 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, doi:10.3847/1538-4357/ab09f9, Bibcode: 2019ApJ...874..136S
- ↑ 6.0 6.1 Wu, Ya-Lin; Bowler, Brendan P.; Sheehan, Patrick D.; Andrews, Sean M.; Herczeg, Gregory J.; Kraus, Adam L.; Ricci, Luca; Wilner, David J. et al. (2020), "ALMA 0.88 mm survey of disks around planetary-mass companions", The Astronomical Journal 159 (5): 229, doi:10.3847/1538-3881/ab818c, Bibcode: 2020AJ....159..229W
- ↑ Ratzka, T.; Köhler, R.; Leinert, Ch. (2005), "A Multiplicity Survey of the Rho Ophiuchi Molecular Clouds", Astronomy & Astrophysics 437 (2): 611–626, doi:10.1051/0004-6361:20042107, Bibcode: 2005A&A...437..611R
Coordinates: 
16h 26m 28.0400s, −25° 26′ 47.7168″
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