TOI-1136
Observation data
Epoch J2000      Equinox J2000
Constellation Draco[1]
Right ascension 12h 48m 44.37261s[2]
Declination +64° 51′ 19.1475″[2]
Apparent magnitude (V) 9.534[3]
Characteristics
Evolutionary stage Main sequence
Spectral type G5[4]
Apparent magnitude (B) 10.16±0.03[4]
Apparent magnitude (V) 9.534±0.003[3]
Apparent magnitude (G) 9.376±0.003[2]
Apparent magnitude (J) 8.363±0.020[4]
Apparent magnitude (H) 8.088±0.018[4]
Apparent magnitude (K) 8.034±0.021[4]
Astrometry
Radial velocity (Rv)7.51±0.20[2] km/s
Proper motion (μ) RA: 1.216 mas/yr[2]
Dec.: -10.045 mas/yr[2]
Parallax (π)11.8236 ± 0.0108 mas[2]
Distance275.9 ± 0.3 ly
(84.58 ± 0.08 pc)
Details[3]
Mass1.022±0.027 M☉
Radius0.968±0.036 R☉
Surface gravity (log g)4.47±0.04 cgs
Temperature5770±50 K
Metallicity [Fe/H]0.07±0.06 dex
Rotation8.42±0.09 d[5]
Rotational velocity (v sin i)6.7±0.6 km/s
Age700±150 Myr
Other designations
BD+65 902, SAO 15908, PPM 18379, TOI-1136, TIC 142276270, TYC 4165-581-1, GSC 04165-00581, 2MASS J12484436+6451191[4]
Database references
SIMBADdata

TOI-1136 is a G-type main-sequence star 276 light-years (85 parsecs) away in the constellation Draco. It is slightly smaller than the Sun and similar in mass and temperature, but is much younger, with an age of about 700 million years. It hosts a system of at least six, and possibly seven, exoplanets.[3]

Planetary system

TOI-1136 was discovered to have six transiting planets in 2022 using the Transiting Exoplanet Survey Satellite (TESS), all orbiting closer to their star than Mercury is to the Sun.[3] All of them are Neptune-sized or mini-Neptunes, and their masses have been measured using a combination of radial velocity and transit-timing variations, showing them to have low densities.[5] The planets are in an orbital resonance, with period ratios near 3:2, 2:1, 3:2, 7:5, and 3:2.[3]

A possible single transit of a seventh planet was also identified. This candidate planet would also be sub-Neptune-sized, but its orbit is poorly constrained. If this is confirmed, it would make TOI-1136 one of the largest known planetary systems.[5]

The TOI-1136 planetary system[3][5]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 3.50+0.8
−0.7 M🜨 		0.05106±0.0009 4.1727±0.0003 0.027±0.009 86.44+0.27
−0.21° 		1.90+0.21
−0.15 R🜨
c 6.32+1.1
−1.3 M🜨 		0.0669±0.0005 6.2574±0.0002 0.11±0.01 89.42+0.39
−0.55° 		2.879+0.060
−0.062 R🜨
d 8.35+1.8
−1.6 M🜨 		0.1062±0.0008 12.5199±0.0004 0.042±0.004 89.41±0.28° 4.627+0.077
−0.072 R🜨
e 6.07+1.09
−1.01 M🜨 		0.139±0.002 18.801±0.001 0.0425±0.004 89.31+0.26
−0.18° 		2.639+0.072
−0.088 R🜨
f 9.7+3.9
−3.7 M🜨 		0.174±0.002 26.321±0.001 0.001±0.001 89.38+0.22
−0.17° 		3.88±0.11 R🜨
g 5.6+4.1
−3.2 M🜨 		0.229±0.003 39.545±0.002 0.04±0.01 89.65+0.18
−0.13° 		2.53+0.11
−0.12 R🜨
h (unconfirmed) <18.8 M⊕ ~0.36 ~77 0.04+0.05
−0.03 		89.68±0.02° 2.68+0.20
−0.18 R⊕

See also

References

  1. ^ "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008. Archived from the original on 15 August 2019. Retrieved 11 December 2023.
  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 Dai, Fei; Masuda, Kento; et al. (February 2023). "TOI-1136 is a Young, Coplanar, Aligned Planetary System in a Pristine Resonant Chain". The Astronomical Journal. 165 (2): 33. arXiv:2210.09283. Bibcode:2023AJ....165...33D. doi:10.3847/1538-3881/aca327.
  4. ^ a b c d e f "TOI-1136". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 10 December 2023.
  5. ^ a b c d Beard, Corey; Robertson, Paul; et al. (December 2023). "The TESS-Keck Survey XVII: Precise Mass Measurements in a Young, High Multiplicity Transiting Planet System using Radial Velocities and Transit Timing Variations". The Astronomical Journal. arXiv:2312.04635.


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