Luyten's Star

Coordinates: Sky map 07h 27m 24.4991s, +05° 13′ 32.827″
Source: Wikipedia, the free encyclopedia.
Luyten's Star
Luyten's Star is located in the constellation Canis Minor.
Luyten's Star is located in the constellation Canis Minor.
Luyten's Star
Location of Luyten's Star in the constellation Canis Minor

Observation data
Epoch J2000      Equinox J2000
Constellation Canis Minor
Right ascension 07h 27m 24.49897s[1]
Declination +05° 13′ 32.8415″[1]
Apparent magnitude (V) 9.872[2]
Characteristics
Spectral type M3.5V[3]
U−B color index 1.115[2]
B−V color index 1.571[2]
Variable type None
Distance
12.348 ± 0.002 ly
(3.7861 ± 0.0006 pc)
Absolute magnitude (MV)11.94[2]
Details
Gyr
MCC 17[7]
Database references
SIMBADdata

Luyten's Star

circumstellar habitable zone.[9]

Properties

This star is approximately a quarter the mass of the

M-type star.[5][13]

At present, Luyten's Star is moving away from the

space velocity components of Luyten's Star are U = +16, V = −66 and W = −17 km/s.[16][17][18]

Planetary system

The Luyten's Star planetary system[4]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
c ≥1.18±0.16 M🜨 0.036467±0.000002 4.7234±0.0004 0.17+0.13
−0.12 		~72°–90[b]° —
b ≥2.89+0.27
−0.26 M🜨 		0.091101+0.000019
−0.000017 		18.6498+0.0059
−0.0052 		0.10+0.09
−0.07 		~72°–90[b]° —
d (unconfirmed) ≥10.8+3.9
−3.5 M🜨 		0.712+0.062
−0.076 		413.9+4.3
−5.5 		0.17+0.18
−0.17 		~72°–90° —
e (unconfirmed) ≥9.3+4.3
−3.9 M🜨 		0.849+0.083
−0.092 		542±16 0.03+0.20
−0.03 		~72°–90° —

In March 2017, two candidate planets were discovered orbiting Luyten's Star.

equilibrium temperature could be anywhere between 206 and 293 Kelvin. The inner planet, GJ 273c, is one of the lightest exoplanets detected by radial velocities, with a mass of only 1.18 ± 0.16 Earth masses. However, it orbits much further in, with an orbital period of only 4.7234 ± 0.00004 days.[9]

GJ 273b is one of the closest known planets in its star's habitable zone.[9]

Both planets are near 4:1 resonance; it is possible that, with still undiscovered ones, the entire inner part of this system is trapped in a single simple-mean-motion resonance chain like TRAPPIST-1.

In 2019, two more candidate planets were detected by radial velocity, making a potential total of four known planets in the system.[19] If all four planets are present, their true masses must be close to their minimum masses for the system to be stable, with upper limits of 3.03 M🜨 for b, 1.24 M🜨 for c, 11.35 M🜨 for d, and 9.70 M🜨 for e.[4]

In October 2017, "

METI and the Sónar music festival in Barcelona, Spain[20] transmitted a series of radio signals towards Luyten's star from a radar antenna at Ramfjordmoen, Norway.[21]
The signal consisted of a scientific and mathematical tutorial on how to decode the messages and was accompanied by 33 encoded musical compositions by various musicians. A second signal series was transmitted in May 2018. Were anyone listening, the soonest response would be received by 2042.

See also

Notes

  1. ^ This is denoted by v sin i, where v is the rotational velocity at the equator and i is the inclination to the line of sight.
  2. ^ a b In a solution with 2 planets around Luyten's Star for Luyten b and Luyten c, the system was unstable when the inclination was below 50° and the planets were on very eccentric orbits. However, with lower eccentricities, the 2 planet system tolerated the full range of inclinations.

References

  1. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  2. ^
    doi:10.1046/j.1365-8711.2002.05403.x
    .
  3. ^ a b c The One Hundred Nearest Stars (Report). Research Consortium On Nearby Stars. 2009-01-01. Retrieved 2009-09-03.
  4. ^
    S2CID 219721292
    . GJ 273 is a planetary system orbiting an M dwarf only 3.75 pc away, composed of two confirmed planets, GJ 273b and GJ 273c, and two promising candidates, GJ 273d and GJ 273e ... the system remained stable only for values of inclinations ranging from 90◦ to ~72◦
  5. ^
    S2CID 18660955
    .
  6. ^
    S2CID 119181646
  7. ^ "BD+05 1668". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 October 2023.
  8. Bibcode:1935BHarO.900....1L
    .
  9. ^
    S2CID 119418595
    .
  10. doi:10.1086/190459
    .
  11. S2CID 15159121
    .
  12. S2CID 8672566
    .
  13. Commonwealth Scientific and Industrial Research Organisation. 21 December 2004. Archived from the original
    on 22 February 2012. Retrieved 2012-01-16.
  14. doi:10.1051/0004-6361:20011330
    .
  15. ISBN 978-0-471-70410-2
    .
  16. ^ a b "Annotations on LHS 33 object".
    Centre de Données astronomiques de Strasbourg
    . Retrieved 2010-04-21.
  17. Bibcode:1998A&A...331..581D
    .
  18. ^ "ARICNS star page of GJ 273". Astronomisches Rechen-Institut Heidelberg. Retrieved 2010-04-21.
  19. arXiv:1906.04644 [astro-ph.EP
    ].
  20. ^ "Sónar music festival". Sónar. Barcelona, ES.
  21. ^ "How to send a message to another planet". The Economist. 16 November 2017. Retrieved 19 November 2017.

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=Luyten%27s_Star&oldid=1216048469"