CHXR 73

Last updated
CHXR 73
Hubbledwarf.jpg
HST image of CHXR 73 and its companion
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
2MASS J11062877-7737331 [5]
Database references
SIMBAD data

CHXR 73 is a star in the constellation Chamaeleon, about 620 light-years away from Earth. [1] [6]

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

A 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.

The CHXR 73 planetary system [4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 13±6  MJ 210————

References

  1. 1 2 3 4 5 6 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.
  2. ↑ "Notes on CHXR 73 b". Extrasolar Planets Encyclopaedia . Retrieved 24 December 2016.
  3. 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. arXiv: 1304.1150 . Bibcode:2013A&A...554A..43D. doi:10.1051/0004-6361/201321220. S2CID   59440639.
  4. 1 2 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
  5. 1 2 "CHXR 73". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 13 November 2016.
  6. ↑ "Newfound Object Further Blurs Planet Definition". Space.com . Retrieved 13 November 2016.
  7. ↑ 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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