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

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 mas[1]
Distance620 ± 20 ly
(191 ± 6 pc)
Details[3]
Mass0.32 ± 0.11 M☉
Radius0.83 ± 0.04 R☉
Luminosity0.09 ± 0.07 L☉
Temperature3490 ± 180 K
Age2±1[4] Myr
Other designations
2MASS J11062877-7737331[5]
Database references
SIMBADdata

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. 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". Retrieved 24 December 2016.
  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.
  4. 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. "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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На других языках

[de] CHXR 73

CHXR 73 ist ein Stern im Sternbild Chamäleon. Er befindet sich in der Molekülwolke Cha I in circa 620 Lichtjahren Entfernung zur Erde.[10][11] Mit einer Temperatur von 3490 K und einer Masse von 0,32 M☉ liegt er im typischen Spektrum Roter Zwerge, sein Radius von 0,83 R☉ ist jedoch verhältnismäßig groß, was durch sein junges Alter von nur 8 Millionen Jahren zu erklären ist.[12]
- [en] CHXR 73


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