CHXR 73 is a star in the constellation Chamaeleon, about 620 light-years away from Earth.[1][6]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 11h 06m 28.7626s[1] |
| Declination | −77° 37′ 33.1444″[1] |
| Characteristics | |
| Spectral type | M3[2] |
| Astrometry | |
| Proper motion (μ) | RA: −22.193±0.233[1] mas/yr Dec.: 0.215±0.206[1] mas/yr |
| Parallax (π) | 5.2343 ± 0.1759 mas[1] |
| Distance | 620 ± 20 ly (191 ± 6 pc) |
| Details[3] | |
| Mass | 0.32 ± 0.11 M☉ |
| Radius | 0.83 ± 0.04 R☉ |
| Luminosity | 0.09 ± 0.07 L☉ |
| Temperature | 3490 ± 180 K |
| Age | 2±1[4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The star is located within Cha I, a molecular cloud.[5] It has a low temperature of 3,490 K typical of red dwarfs, but unlike typical red dwarfs it has an unusually large radius of 0.83 R☉—this is because of its young age, only 8 million years.[3]
Planetary system
editA companion, CHXR 73 b, has been found via direct imaging. CHXR 73 has a mass of about 12 Jupiters.[7] This is close to the upper mass limit for planets, making its classification difficult.[citation needed]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 13±6 MJ | 210 | — | — | — | — |
References
edit- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ "Notes on CHXR 73 b". Extrasolar Planets Encyclopaedia. Retrieved 24 December 2016.
- ^ a b Daemgen, S.; Petr-Gotzens, M. G.; Correia, S.; Teixeira, P. S.; Brandner, W.; Kley, W.; Zinnecker, H. (2013). "Protoplanetary disk evolution and stellar parameters of T Tauri binaries in Chamaeleon I". Astronomy & Astrophysics. 554: A43. arXiv:1304.1150. Bibcode:2013A&A...554A..43D. doi:10.1051/0004-6361/201321220. S2CID 59440639.
- ^ a b Bowler, Brendan P. (2016), "Imaging Extrasolar Giant Planets", Publications of the Astronomical Society of the Pacific, 128 (968): 102001, arXiv:1605.02731, doi:10.1088/1538-3873/128/968/102001, S2CID 118614968
- ^ a b "CHXR 73". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 November 2016.
- ^ "Newfound Object Further Blurs Planet Definition". Space.com. Retrieved 13 November 2016.
- ^ Luhman, K. (2006). "Discovery of a Young Substellar Companion in Chamaeleon". The Astrophysical Journal. 649 (2): 894–899. arXiv:astro-ph/0609187. Bibcode:2006ApJ...649..894L. doi:10.1086/506517. S2CID 14609766.
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