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 28.7626s[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[1] mas
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 M_J	210	—	—	—	—

References

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". Retrieved 24 December 2016.
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.
IMAGING EXTRASOLAR GIANT PLANETS, 2016, arXiv:1605.02731
"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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[Gaia_DR2-1] 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.

[EU-2] "Notes on CHXR 73 b". Retrieved 24 December 2016.

[Daemgen-3] 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.

[Bowler2016-4] IMAGING EXTRASOLAR GIANT PLANETS, 2016, arXiv:1605.02731

[SIMBAD-5] "CHXR 73". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 November 2016.

[space-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.