Tau Boötis

Coordinates: Sky map 13h 47m 15.7s, +17° 27′ 25″
Source: Wikipedia, the free encyclopedia.
Not to be confused with T Boötis.
τ Boötis

Location of τ Boötis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Boötes
Right ascension 13h 47m 15.7382s[1]
Declination +17° 27′ 24.810″[1]
Apparent magnitude (V) 4.50[2] (4.46 to 4.52)[3]
Characteristics
Spectral type F6V + M2[4]
B−V color index 0.48[2]
Variable type Suspected[3]
Distance
50.92 ± 0.09 ly
(15.61 ± 0.03 pc)
Absolute magnitude (MV)3.38[5]
Argument of periastron
(ω)
(secondary)		290.7+13
−10°
Details
τ Boo A
Rotational velocity (v sin i)
5.0[7] km/s
LTT
 14021
Database references
SIMBADdata
A
B

Tau Boötis,

radio emissions from a planet beyond the Solar System. According to the researchers: "The signal is from the Tau Boötis system, which contains a binary star and an exoplanet. We make the case for an emission by the planet itself."[8][9]

Stellar components

The system is a

spectral type F6V) and secondary is a dim red dwarf (spectral type M2).[4] The system is relatively nearby, distance being about 51 light-years
. The primary star should be easily visible to the unaided eye under dark skies.

The primary star, Tau Boötis A is a yellow-white dwarf. It is 35 percent more massive and 42 percent larger than the

magnetic activity cycle for this star shows a period of 122 days—much shorter than the solar cycle.[11]

Tau Boötis B (with a capital B, as opposed to the planet) is a dim, 11 mag red dwarf with only about half the mass and radius of the Sun. It orbits the primary star at an average distance of about 220

arcseconds) but comes as close as about 28 AU to the primary, giving its orbit a very high eccentricity of about 0.87. One orbit around the primary would take approximately 2400 years to complete.[4]

Planetary system

In 1996 the

tidally locked to each other.[14]

The Tau Boötis A planetary system[15]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 6±0.28 MJ 0.0481 ± 0.028 3.312463 ± 0.000014 0.023 ± 0.015 44.5 ± 1.5° —

Naming controversy

The planet and its host star was one of the planetary systems selected by the International Astronomical Union as part of NameExoWorlds, their public process for giving proper names to exoplanets and their host star (where no proper name already exists).[16][17] The process involved public nomination and voting for the new names, and the IAU announced the new names in mid-December 2015.[18] However, the IAU annulled the vote for the system, as the winning names ("Shri Ram Matt" for the star and "Bhagavatidevi" for the planet)[17] were judged not to conform with the IAU rules for naming exoplanets due to the political activities of the namesake people.[19] The names garnered the majority of the votes cast for the system, and also making up a significant proportion of all votes cast as part of the contest.[17]

See also

References

  1. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  2. ^
    Bibcode:1999A&A...352..495M
    .
  3. ^
    S2CID 125853869
    . Search for: NSV 6444.
  4. ^
    ISSN 0004-6361
    .
  5. S2CID 8642707
    .
  6. ^
    S2CID 53490623
    .
  7. ^
    ISSN 0004-6361
    .
  8. ^ Friedlander, Blaine (16 December 2020). "Astronomers detect possible radio emission from exoplanet". Phys.org. Retrieved 16 December 2020.
  9. doi:10.1051/0004-6361/201937201
    .
  10. S2CID 119089082
    .
  11. doi:10.1051/0004-6361/201629156
    . A119.
  12. doi:10.1086/310444
    .
  13. S2CID 118503912
    .
  14. S2CID 56317105
    .
  15. S2CID 119067572
    .
  16. ^ "NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars". International Astronomical Union. 9 July 2014. Retrieved 8 January 2016.
  17. ^ a b c "The ExoWorlds". NameExoWorlds. International Astronomical Union. n.d. Retrieved 8 January 2016.
  18. ^ "The Process". NameExoWorlds. International Astronomical Union. 30 November 2015. Archived from the original on 15 August 2015. Retrieved 8 January 2016.
  19. ^ "Final Results of NameExoWorlds Public Vote Released". International Astronomical Union. 15 December 2015. Retrieved 8 January 2016.

External links


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