CHXR 73

CHXR 73

HST image of CHXR 73 and its companion
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Chamaeleon
Right ascension 11h 06m 28.774s[1]
Declination −77° 37′ 33.16″[1]
Characteristics
Spectral type M3[2]
Astrometry
Distance550[3] ly
Details[4]
Mass0.32 ± 0.11 M☉
Radius0.83 ± 0.04 R☉
Luminosity0.09 ± 0.07 L☉
Temperature3490 ± 180 K
Age8+70
−5 Myr
Other designations
2MASS J11062877-7737331[1]
Database references
SIMBADdata

CHXR 73 is a star in the constellation Chamaeleon, about 550 light-years away from Earth.[3]

The star is located within Cha I, a molecular cloud.[1] 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.[4] A companion, CHXR 73 b, has been found via direct imaging. CHXR 73 has a mass of about 12 Jupiters.[5] This is close to the upper mass limit for planets, making its classification difficult.

The CHXR 73 system
Companion MassObserved separation
(AU)		Discovery year
b12+8
−5 MJ		2002006

References

  1. 1 2 3 4 "CHXR 73". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 November 2016.
  2. ↑ "Notes on CHXR 73 b". Retrieved 24 December 2016.
  3. 1 2 "Newfound Object Further Blurs Planet Definition". Space.com. Retrieved 13 November 2016.
  4. 1 2 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. Bibcode:2013A&A...554A..43D. arXiv:1304.1150 Freely accessible. doi:10.1051/0004-6361/201321220.
  5. ↑ Luhman, K. (2006). "Discovery of a Young Substellar Companion in Chamaeleon". The Astrophysical Journal. 649 (2): 894–899. Bibcode:2006ApJ...649..894L. doi:10.1086/506517.


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