Planet tau Boo Ab

Detailed information about planet tau Boo Ab and its parameters.

Planet

Name
tau Boo Ab
Planet Status
Confirmed
Discovered in
1996
Update
2024-08-06
Mass
5.84 ( +0.99 -0.55 ) MJ
Mass*sin(i)
Semi-Major Axis
Orbital Period
Eccentricity
ω
Tperi
Radius
Inclination
Detection Method
Radial Velocity
Mass Meas. Method
Radius Meas. Method
Theoretical
Primary transit
Secondary transit
λ
Impact Parameter b
Time Vr=0
Velocity Semiamplitude K
Calculated temperature
Measured temperature
Hottest point longitude
Geometric albedo
Surface gravity log(g/gH)
Alternate Names
tau Boö b
Data Source Type Result Value Result Figure Notes Reference
Molecule Data Source Type Result Value Result Figure Notes Reference
CO
Measurements Detected 2021 - PELLETIER S.
H2O
Measurements Detected Controversial (see Pelletier et al. 2021) 2014 - LOCKWOOD A.
Measurements Detected not detected 2021 - PELLETIER S.

    24 Jul. 2000: the source of RV variation remains speculative, depending on completion of one full orbit (Fischer et al 2000).
  1. `Probable detection' of the reflected star-light by the planet (Cameron et. al, 1999). The albedo is claimed to be detected only from 456 to 524 nm.
  2. 22 Sep. 2000: the planet not so bright as previously announced (Cameron et al).
  3. Exhibits coherent variations in residual velocities consistent with additional companion.
  4. 20 Apr. 2003: Planet in wide (a ~ 240 AU) binary system (Eggenberger et al 2003)
  5. 10 Sep. 2003: New upper limit of 0.39 for the reflection albedo (Leigh et al 2003)
  6. 10 Apr. 2009: RV measurements with amateur spectrograph (Christian Buil).
28 Jul 2024: See also Planets in Binaries webpage.

Star

The star has an M dwarf companion star ( GJ 527B) 220 AUs away tracing a highly eccentric orbit (e = 0.87, i =47.2°, P = 2420 y).
Pinfield et al. (2006) reported a widely separated (a = 664 AUs) candidate L-type brown dwarf companion. If confirmed it would be a circumbinary substellar object.

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