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TOI-4342
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Octans[1]
Right ascension 21h 37m 32.864s[2]
Declination −77° 58′ 43.51″[2]
Characteristics
Evolutionary stage main sequence star
Spectral type M0V
Variable type planetary transit
Astrometry
Radial velocity (Rv)−4.43±0.36[2] km/s
Proper motion (μ) RA: 120.333(19) mas/yr[2]
Dec.: −91.503(18) mas/yr[2]
Parallax (π)16.2487 ± 0.0184 mas[2]
Distance200.7 ± 0.2 ly
(61.54 ± 0.07 pc)
Details
Mass0.6296 ±0.0086 M☉
Radius0.599 ±0.013 R☉
Luminosity−1.13+0.03
−0.03 L☉
Temperature3901 ±69 K
Other designations
TOI-4342, TIC 354944123, 2MASS J21373286-7758435[3]
Database references
SIMBADdata

TOI-4342 is a red dwarf star in the constellation Octans located 201 light-years from Earth.

Planetary system

It hosts two planets discovered in 2023.[4][5] They are locked in a near 2:1 orbital resonance.

TOI-4342 b is a Neptune-like body located 0.05251 AU from its star. Its orbital period around the star is 5.5 days. TOI-4342 b has a radius that is 0.202 that of Jupiter and a mass of 5.76 that of Earth. Its discovery in early 2023 was made through the use of a transit detection method of TOI-4342. The transit method was performed by the Transiting Exoplanet Survey Satellite (TESS). TOI-4342 b was the first of two exoplanets found orbiting TOI-4342. The other planet is TOI-4342 c.[4]

TOI-4342 c is a Neptune-like body located 0.0814 AU from its star. Its orbital period around the star is 10.7 days. TOI-4342 c has a radius that is 0.215 that of Jupiter and a mass of 6.41 that of Earth. Its discovery in early 2023 was made through the use of a transit detection method of TOI-4342. The transit method was performed by the Transiting Exoplanet Survey Satellite (TESS). TOI-4342 b was the first of two exoplanets found orbiting TOI-4342. The other planet is TOI-4342 b.[5]

The TOI-4342 planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 5.76 M🜨 0.05251 5.5 0 — —
c 6.41 M🜨 0.0814 10.7 0 — —

References

  1. ^ "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008.
  2. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ "TOI-4342". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 September 2023.
  4. ^ a b "The Extrasolar Planet Encyclopaedia — TOI-4342 b". Extrasolar Planets Encyclopaedia. Retrieved 11 September 2023.
  5. ^ a b "The Extrasolar Planet Encyclopaedia — TOI-4342 c". Extrasolar Planets Encyclopaedia. Retrieved 11 September 2023.
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