Astronomy:HAT-P-15
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Perseus |
| Right ascension | 04h 24m 59.5350s[1] |
| Declination | +39° 27′ 38.313″[1] |
| Apparent magnitude (V) | 12.41 |
| Characteristics | |
| Spectral type | G5V |
| Variable type | planetary transit[2] |
| Astrometry | |
| Radial velocity (Rv) | 31.21 km/s |
| Proper motion (μ) | RA: 14.233(21)[1] mas/yr Dec.: −9.407(15)[1] mas/yr |
| Parallax (π) | 5.1856 ± 0.0166[1] mas |
| Distance | 629 ± 2 ly (192.8 ± 0.6 pc) |
| Details[3] | |
| Mass | 1.013±0.043 M☉ |
| Radius | 1.080±0.039 R☉ |
| Luminosity | 1.00±0.11 L☉ |
| Surface gravity (log g) | 4.38±0.03 cgs |
| Temperature | 5684±25 K |
| Metallicity | 0.272±0.031 |
| Rotational velocity (v sin i) | 2.0±0.5 km/s |
| Age | 6.8+2.5−1.6 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HAT-P-15 is a G-type main-sequence star about 630 light-years away. The star is older than Sun yet has a concentration of heavy elements roughly 190% of solar abundance.[3] The star has no noticeable starspot activity.[5]
The spectroscopic survey in 2015 have failed to find any stellar companions to it,[6] yet imaging survey have identified a possibly two companion red dwarf stars at projected separations 1210 and 1370 AU, respectively.[7]
The star was named Berehynia in December 2019 by Ukrainian amateur astronomers.[8]
Planetary system
In 2010 a transiting hot superjovian planet b (named Tryzub in 2019[8]) was detected. It has an equilibrium temperature of 904±20 K.[2] An orbital simulation shows that any planets inward of the orbit of b would spiral inward and be destroyed within a time-span of less than a billion years.[9] The planetary orbit is well aligned with the equatorial plane of the star, misalignment equal to 13±6 degrees.[10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Tryzub | 1.946±0.066 MJ | 0.0964±0.0014 | 10.863502±0.000027 | 0.19±0.019 | 89.1±0.2° | 1.072±0.043 RJ |
References
- ↑ 1.0 1.1 1.2 1.3 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 2.2 Kovács, G.; Bakos, G. Á.; Hartman, J. D.; Torres, G.; Noyes, R. W.; Latham, D. W.; Howard, A. W.; Fischer, D. A. et al. (2010), "HAT-P-15b: A 10.9-Day Extrasolar Planet Transiting a Solar-Type Star", The Astrophysical Journal 724 (2): 866–877, doi:10.1088/0004-637X/724/2/866, Bibcode: 2010ApJ...724..866K
- ↑ 3.0 3.1 Teske, Johanna K.; Thorngren, Daniel; Fortney, Jonathan J.; Hinkel, Natalie; Brewer, John M. (2019), "Do Metal-Rich Stars Make Metal-Rich Planets? New Insights on Giant Planet Formation from Host Star Abundances", The Astronomical Journal 158 (6): 239, doi:10.3847/1538-3881/ab4f79, Bibcode: 2019AJ....158..239T
- ↑ HAT-P-15 -- Star
- ↑ Shkolnik, Evgenya L. (2013), "An Ultraviolet Investigation of Activity on Exoplanet Host Stars", The Astrophysical Journal 766 (1): 9, doi:10.1088/0004-637X/766/1/9, Bibcode: 2013ApJ...766....9S
- ↑ Piskorz, Danielle; Knutson, Heather A.; Ngo, Henry; Muirhead, Philip S.; Batygin, Konstantin; Crepp, Justin R.; Hinkley, Sasha; Morton, Timothy D. (2015), "Friends of Hot Jupiters III: An Infrared Spectroscopic Search for Low-Mass Stellar Companions", The Astrophysical Journal 814 (2): 148, doi:10.1088/0004-637X/814/2/148, Bibcode: 2015ApJ...814..148P
- ↑ Wöllert, Maria; Brandner, Wolfgang (2015), "A Lucky Imaging search for stellar sources near 74 transit hosts", Astronomy & Astrophysics 579: A129, doi:10.1051/0004-6361/201526525, Bibcode: 2015A&A...579A.129W
- ↑ 8.0 8.1 "Украина выбрала имена для звезды и экзопланеты". 18 December 2019. https://news.liga.net/society/news/ukraina-vybrala-imena-dlya-zvezdy-i-ekzoplanety.
- ↑ Van Laerhoven, Christa; Greenberg, Richard (2014), "Small Inner Companions of Warm Jupiters: Lifetimes and Legacies", The Astrophysical Journal 778 (2): 182, doi:10.1088/0004-637X/778/2/182
- ↑ Mancini, L. et al. (2022), "The GAPS Programme at TNG", Astronomy & Astrophysics 664: A162, doi:10.1051/0004-6361/202243742
Coordinates: 
04h 24m 59.5348s, +39° 27′ 38.3124″
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