Astronomy:HAT-P-29
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Perseus |
| Right ascension | 02h 12m 31.47875s[1] |
| Declination | +51° 46′ 43.5637″[1] |
| Apparent magnitude (V) | 11.83 |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | G |
| Astrometry | |
| Radial velocity (Rv) | −21.91±0.69[1] km/s |
| Proper motion (μ) | RA: -9.972[1] mas/yr Dec.: 1.790[1] mas/yr |
| Parallax (π) | 3.1358 ± 0.0201[1] mas |
| Distance | 1,040 ± 7 ly (319 ± 2 pc) |
| Orbit[2] | |
| Primary | HAT-P-29 |
| Companion | HAT-P-29 B |
| Semi-major axis (a) | 3.290±0.002" (1041 AU) |
| Details[3] | |
| Mass | 1.198+0.065−0.063 M☉ |
| Radius | 1.229+0.080−0.073 R☉ |
| Luminosity | 1.89+0.3−0.25 L☉ |
| Surface gravity (log g) | 4.337+0.045−0.045 cgs |
| Temperature | 6112±88 K |
| Metallicity [Fe/H] | 0.128+0.079−0.080 dex |
| Age | 2.2±1.0[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HAT-P-29, also known as Muspelheim since 2019 (as part of the IAU's NameExoWorlds project),[6] is a star about 1,040 light-years (320 parsecs) away. It is a G-type main-sequence star. The star's age of 2.2±1.0 billion years is less than half that of the Sun.[4] HAT-P-29 is slightly enriched in heavy elements, having 35% more iron than the Sun.
A very faint 19th-magnitude stellar companion was detected in 2016 at a projected separation of 3.290±0.002″,[2] but Gaia DR2 astrometry suggests that this is an unrelated background object.[7]
Planetary system
In 2011 a transiting hot Jupiter planet, HAT-P-29b, was detected on a mildly eccentric orbit.[4] The planet was named "Surt" by Denmark in 2019.[8] The planetary orbit is likely aligned with the equatorial plane of the star, with a misalignment equal to 26±16 degrees.[9]
In 2018, a transit-timing variation survey indicated additional planets with masses exceeding approximately half of Earth are absent in the system.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (Surt) | 0.767+0.046−0.045 MJ | 0.0665±0.0012 | 5.723376±0.000021 | 0.073+0.029−0.028 | 88.06+0.78−0.59° | 1.055+0.079−0.072 RJ |
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 Ngo, Henry; Knutson, Heather A.; Hinkley, Sasha; Bryan, Marta; Crepp, Justin R.; Batygin, Konstantin; Crossfield, Ian; Hansen, Brad et al. (2016), "FRIENDS OF HOT JUPITERS. IV. STELLAR COMPANIONS BEYOND 50 au MIGHT FACILITATE GIANT PLANET FORMATION, BUT MOST ARE UNLIKELY TO CAUSE KOZAI–LIDOV MIGRATION", The Astrophysical Journal 827 (1): 8, doi:10.3847/0004-637X/827/1/8, Bibcode: 2016ApJ...827....8N
- ↑ 3.0 3.1 3.2 Wang, Songhu; Wang, Xian-Yu; Wang, Yong-Hao; Liu, Hui-Gen; Hinse, Tobias C.; Eastman, Jason; Bayliss, Daniel; Hori, Yasunori et al. (2018), "Transiting Exoplanet Monitoring Project (TEMP). I. Refined System Parameters and Transit Timing Variations of HAT-P-29b", The Astronomical Journal 156 (4): 181, doi:10.3847/1538-3881/aadcfc, Bibcode: 2018AJ....156..181W
- ↑ 4.0 4.1 4.2 Buchhave, L. A.; Bakos, G. Á.; Hartman, J. D.; Torres, G.; Latham, D. W.; Andersen, J.; Kovács, G.; Noyes, R. W. et al. (2011), "HAT-P-28b AND HAT-P-29b: TWO SUB-JUPITER MASS TRANSITING PLANETS", The Astrophysical Journal 733 (2): 116, doi:10.1088/0004-637X/733/2/116, Bibcode: 2011ApJ...733..116B
- ↑ "HAT-P-29". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HAT-P-29.
- ↑ IAU100 NameExoWorlds APPROVED NAMES
- ↑ Mugrauer, M. (2019). "Search for stellar companions of exoplanet host stars by exploring the second ESA-Gaia data release". Monthly Notices of the Royal Astronomical Society 490 (4): 5088. doi:10.1093/mnras/stz2673. Bibcode: 2019MNRAS.490.5088M.
- ↑ Denmark names new planet after Norse fire giant Surt
- ↑ Mancini, L. et al. (2022), "The GAPS Programme at TNG", Astronomy & Astrophysics 664: A162, doi:10.1051/0004-6361/202243742
Coordinates: 
02h 12m 31.4785s, +51° 46′ 43.5621″
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