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Gliese 341 edit

Gliese 341
Observation data
Epoch J2000      Equinox J2000
Constellation Carina[1]
Right ascension 09h 21m 37.60154s[2]
Declination −60° 16′ 55.0300″[2]
Apparent magnitude (V) 9.465[3]
Characteristics
Evolutionary stage Main sequence
Spectral type M0.0[3]
Apparent magnitude (B) 10.955[3]
Apparent magnitude (V) 9.465[3]
Apparent magnitude (G) 8.681±0.003[2]
Apparent magnitude (J) 6.442±0.023[3]
Apparent magnitude (H) 5.793±0.033[3]
Apparent magnitude (K) 5.587±0.021[3]
Astrometry
Radial velocity (Rv)39.59±0.14[2] km/s
Proper motion (μ) RA: -840.185 mas/yr[2]
Dec.: 182.056 mas/yr[2]
Parallax (π)95.6982 ± 0.0145 mas[2]
Distance34.082 ± 0.005 ly
(10.450 ± 0.002 pc)
Details[4]
Mass0.522[5] M☉
Radius0.506 R☉
Surface gravity (log g)4.72±0.02 cgs
Temperature3770±40 K
Other designations
CD−59 2351, CPD−59 1362, GJ 341, HD 304636, HIP 45908, L 140-9, LFT 643, LHS 2128, LTT 3453, NLTT 21618, TOI-741, TIC 359271092, TYC 8940-2067-1[3]
Database references
SIMBADdata

Gliese 341 is a red dwarf star located 34.1 light-years (10.5 parsecs) away in the constellation Carina. It hosts one known exoplanet.

Planetary system edit

Evidence of a transiting exoplanet, Gliese 341 b, was found in data from TESS,[5] and was confirmed in January 2024 along with a spectrum from JWST. The spectrum is consistent with the planet having no atmosphere, a hazy atmosphere, or an atmosphere mainly composed of certain molecules such as water vapor, while ruling out other types of atmospheres.[4]

Gliese 341 b is slightly smaller than Earth, at 92% of its radius. Its mass is known to be less than 4.5 times that of Earth, and is predicted to be about 0.72±0.14 M🜨 based on its radius. It orbits close to its star, completing an orbit every 7.6 days, and has an equilibrium temperature of 540 K (267 °C; 512 °F).[4]

The Gliese 341 planetary system[4]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b <4.5 M🜨 0.0577[note 1] 7.576863 — 89.22+0.54
−0.96° 		0.92±0.05 R🜨

See also edit

Notes edit

  1. ^ Calculated from a/R*

References edit

  1. ^ "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008.
  2. ^ a b c d e f 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. ^ a b c d e f g h "GJ 341". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 15 January 2024.
  4. ^ a b c d Kirk, James; Stevenson, Kevin B.; et al. (March 2024). "JWST/NIRCam Transmission Spectroscopy of the Nearby Sub-Earth GJ 341b". The Astronomical Journal. 167 (3): 90. arXiv:2401.06043. Bibcode:2024AJ....167...90K. doi:10.3847/1538-3881/ad19df.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  5. ^ a b "ExoFOP TIC 359271092". exofop.ipac.caltech.edu. Retrieved 15 January 2024.
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TOI-540 edit

TOI-540
Observation data
Epoch J2000      Equinox J2000
Constellation Pictor[1]
Right ascension 05h 05m 14.42843s[2]
Declination −47° 56′ 15.5263″[2]
Apparent magnitude (V) 14.365[3]
Characteristics
Evolutionary stage Main sequence
Spectral type M[4]
Apparent magnitude (B) 15.960±0.07[3]
Apparent magnitude (V) 14.365±0.04[3]
Apparent magnitude (G) 12.874±0.003[2]
Apparent magnitude (J) 9.755±0.022[3]
Apparent magnitude (H) 9.170±0.022[3]
Apparent magnitude (K) 8.900±0.021[3]
Astrometry
Radial velocity (Rv)17.33±1.03[2] km/s
Proper motion (μ) RA: -65.901 mas/yr[2]
Dec.: 24.895 mas/yr[2]
Parallax (π)71.5134 ± 0.0215 mas[2]
Distance45.61 ± 0.01 ly
(13.983 ± 0.004 pc)
Details[4]
Mass0.159±0.014 M☉
Radius0.1895±0.0079 R☉
Luminosity (bolometric)0.00346±0.00021 L☉
Temperature3216±83 K
Rotation0.72610±0.00039 d
Rotational velocity (v sin i)13.5±1.5 km/s
Age0.1-2 Gyr
Other designations
TOI-540, TIC 200322593, 2MASS J05051443-4756154, UPM J0505-4756[3]
Database references
SIMBADdata

TOI-540 is a red dwarf star located 45.6 light-years (14.0 parsecs) away in the constellation Pictor. It has about 16% the mass and 19% the radius of the Sun, and a temperature of about 3,216 K (2,943 °C; 5,329 °F). This is a rapidly-rotating star, with a rotation period of only 17 hours. TOI-540 hosts one known exoplanet.

Planetary system edit

The exoplanet TOI-540 b is a transiting planet smaller than Earth, discovered in 2020 by TESS. It orbits very close to its star, completing an orbit in just over a day, and has an equilibrium temperature of 611 K (338 °C; 640 °F).[4]

The TOI-540 planetary system[4]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b — 0.01223±0.00036 1.2391491(17) 0 86.80±0.28° 0.903±0.052 R🜨

References edit

  1. ^ "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008.
  2. ^ a b c d e f 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. ^ a b c d e f g "TOI-540". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 15 January 2024.
  4. ^ a b c d Ment, Kristo; Irwin, Jonathan; et al. (January 2021). "TOI 540 b: A Planet Smaller than Earth Orbiting a Nearby Rapidly Rotating Low-mass Star". The Astronomical Journal. 161 (1): 23. arXiv:2009.13623. Bibcode:2021AJ....161...23M. doi:10.3847/1538-3881/abbd91.{{cite journal}}: CS1 maint: unflagged free DOI (link)


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