astro.wikisort.org - StarROXs 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]
ROXs 12
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
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]
The ROXs 12 planetary system[5]
Companion (in order from star) |
Mass |
Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
Inclination |
Radius |
Protoplanetary or debris disk |
? AU |
— |
— |
b [fr] |
16±4 MJ |
210±20 |
— |
~0 |
— |
— |
The 2MASS J16262774–2527247 planetary system[5]
Companion (in order from star) |
Mass |
Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
Inclination |
Radius |
Protoplanetary disk |
4.1–25.8[5] AU |
— |
— |
References
- "ROXs 12". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-18.
- 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.
- 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
- 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, doi:10.1088/0004-637X/781/1/20, S2CID 41086512
- 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
- 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
Constellation of Scorpius |
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