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WASP-29 is a binary star system in the constellation of Phoenix. The primary star is an orange main sequence star. Its comoving companion, a red dwarf star, was discovered in 2021.[1] The star system kinematically belongs to the thin disk of the Milky Way.[3]

WASP-29
Observation data
Epoch J2000      Equinox
Constellation Phoenix
Right ascension 23h 51m 31.0840s
Declination −39° 54′ 24.2600″
Apparent magnitude (V) 11.33
Characteristics
WASP-29A
Evolutionary stage main sequence star
Spectral type K4V
B−V color index 0.82
J−H color index 0.478
J−K color index 0.570
WASP-29B
Spectral type M3V[1]
Astrometry
Radial velocity (Rv)24.48±0.43 km/s
Proper motion (μ) RA: -56.853±0.041 mas/yr
Dec.: -88.865±0.048 mas/yr
Parallax (π)11.4349 ± 0.0151 mas[2]
Distance285.2 ± 0.4 ly
(87.5 ± 0.1 pc)
Position (relative to WASP-29A)[1]
ComponentWASP-29B
Epoch of observation2021
Angular distance125.2″
Observed separation
(projected)		10994 AU
Details[3]
WASP-29A
Mass0.83±0.03 M☉
Radius0.808±0.044 R☉
Surface gravity (log g)4.5±0.2 cgs
Temperature4800±150 K
Metallicity [Fe/H]0.11±0.14 dex
Rotational velocity (v sin i)1.5±0.6 km/s
Age9 Gyr
WASP-29B
Mass0.38[1] M☉
Other designations
CD-40 15273, WASP-29, TYC 8015-1020-1, DENIS J235131.0-395423, 2MASS J23513108-3954241, Gaia DR2 6534414719318224512
WASP-29A: Gaia EDR3 6534414719318886144
WASP-29B: Gaia EDR3 6534426740931264896
Database references
SIMBADdata

Star characteristics


Primary is an old star with small starspot activity and low x-ray flux.[4]


Planetary system


The "Hot Saturn" class planet WASP-29b was discovered around WASP-29 in 2010.[3] The planet would have an equilibrium temperature of 960±30 K.[5] The planetary atmosphere has abundant carbon monoxide but likely lacks methane[6] and sodium,[7] although high and dense cloud deck of WASP-29 b prevent the high-quality spectroscopic measurements.[8] A study in 2018 revealed the stability of planetary orbits in the habitable zone of WASP-29 is significantly affected by the WASP-29b planet.[9]


The WASP-29 planetary system[3][10][5]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.243+0.020
−0.019 MJ		 0.04566±0.00061 3.92274±0.00013 0.03+0.05
−0.03		 89.468+0.018
−0.017°		 0.755±0.031 RJ

References


  1. Fontanive, Clémence; Daniella Bardalez Gagliuffi (2021), The Census of Exoplanets in Visual Binaries: population trends from a volume-limited Gaia DR2 and literature search, arXiv:2101.12667
  2. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  3. Hellier, Coel; Anderson, D. R.; Collier Cameron, A.; Gillon, M.; Lendl, M.; Maxted, P. F. L.; Queloz, D.; Smalley, B.; Triaud, A. H. M. J.; West, R. G.; Brown, D. J. A.; Enoch, B.; Lister, T. A.; Pepe, F.; Pollacco, D.; Ségransan, D.; Udry, S. (2010). "WASP-29b: A SATURN-SIZED TRANSITING EXOPLANET". The Astrophysical Journal. 723 (1): L60–L63. arXiv:1009.5318. Bibcode:2010ApJ...723L..60H. doi:10.1088/2041-8205/723/1/L60. S2CID 64119308.
  4. Dos Santos, L. A.; Bourrier, V.; Ehrenreich, D.; Sanz-Forcada, J.; López-Morales, M.; Sing, D. K.; García Muñoz, A.; Henry, G. W.; Lavvas, P.; Lecavelier Des Etangs, A.; Mikal-Evans, T.; Vidal-Madjar, A.; Wakeford, H. R. (2021), "HST PanCET program: Non-detection of atmospheric escape in the warm Saturn-sized planet WASP-29 B", Astronomy & Astrophysics, 649: A40, arXiv:2103.15688, doi:10.1051/0004-6361/202140491, S2CID 232417342
  5. Critical Analysis of TESS Transit Photometric Data: Improved Physical Properties for Five Exoplanets, 2021, arXiv:2109.11366
  6. Matthew Hardin, Joseph Harrington, K. Stevenson, "WASP-29b: Another Cool Exoplanet With Abundant CO?"
  7. A Gemini ground-based transmission spectrum of WASP-29b: a featureless spectrum from 515 to 720 nm
  8. The Hubble PanCET Program: A Featureless Transmission Spectrum for WASP-29b and Evidence of Enhanced Atmospheric Metallicity on WASP-80b, 2022, arXiv:2205.10765
  9. Nikolaos Georgakarakos, Siegfried Eggl, and Ian Dobbs-Dixon1Giant, "Planets: Good Neighbors for Habitable Worlds?", 2018
  10. Dragomir, Diana; Kane, Stephen R.; Pilyavsky, Genady; Mahadevan, Suvrath; Ciardi, David R.; Zachary Gazak, J.; Gelino, Dawn M.; Payne, Alan; Rabus, Markus; Ramirez, Solange V.; von Braun, Kaspar; Wright, Jason T.; Wyatt, Pamela (2011). "Terms Photometry of Known Transiting Exoplanets". The Astronomical Journal. 142 (4): 115. arXiv:1108.2308. Bibcode:2011AJ....142..115D. doi:10.1088/0004-6256/142/4/115. S2CID 118606598.

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WASP-29 — звезда в созвездии Феникса на расстоянии приблизительно 260[1] световых лет от нас. Вокруг звезды обращается, как минимум, одна планета.


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