HAT-P-15
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.[2] The star has no noticeable starspot activity.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 04h 24m 59.5348s[1] |
| Declination | +39° 27′ 38.3124″[1] |
| Apparent magnitude (V) | 12.41 |
| Characteristics | |
| Spectral type | G5V |
| Astrometry | |
| Radial velocity (Rv) | 31.21 km/s |
| Proper motion (μ) | RA: 14.403 mas/yr Dec.: -9.377 mas/yr |
| Parallax (π) | 5.1664 ± 0.0544[1] mas |
| Distance | 631 ± 7 ly (194 ± 2 pc) |
| Details[2] | |
| 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 |
The spectroscopic survey in 2015 have failed to find any stellar companions to it,[4] yet imaging survey have identified a possibly two companion red dwarf stars at projected separations 1210 and 1370 AU, respectively.[5]
The star was named Berehynia in December 2019 by the Ukrainian amateur astronomers.[6]
Planetary system
In 2010 a transiting hot superjovian planet b (named Tryzub in 2019[6]) was detected. It has an equilibrium temperature of 904±20 K.[7] The orbital simulation shown the planets inward of orbit of b would in-spiral and be destroyed within time-span of less than billion years.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 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
- HAT-P-15 -- Star
- Do Metal-Rich Stars Make Metal-Rich Planets? New Insights on Giant Planet Formation from Host Star Abundances, 2019, arXiv:1912.00255
- An Ultraviolet Investigation of Activity on Exoplanet Host Stars, 2013, arXiv:1301.6192
- FRIENDS OF HOT JUPITERS III: AN INFRARED SPECTROSCOPIC SEARCH FOR LOW-MASS STELLAR COMPANIONS, 2015, arXiv:1510.08062
- A Lucky Imaging search for stellar sources near 74 transit hosts, 2015, arXiv:1506.05456
- "Украина выбрала имена для звезды и экзопланеты". LIGA.net. Retrieved 2019-12-18.
- {{citation|arxiv=1005.5300|title=HAT-P-15b: A 10.9-DAY EXTRASOLAR PLANET TRANSITING A SOLAR-TYPE STAR|year=2010
- Small Inner Companions of Warm Jupiters: Lifetimes and Legacies, 2014, arXiv:1401.7217