Astronomy:HAT-P-27
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Virgo |
| Right ascension | 14h 51m 04.1870s[1] |
| Declination | +05° 56′ 50.5482″[1] |
| Apparent magnitude (V) | 12.214[2] |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | G8 |
| Astrometry | |
| Radial velocity (Rv) | -15.901[1] km/s |
| Proper motion (μ) | RA: -28.621[1] mas/yr Dec.: -2.757[1] mas/yr |
| Parallax (π) | 4.9922 ± 0.0360[3] mas |
| Distance | 653 ± 5 ly (200 ± 1 pc) |
| Orbit[4] | |
| Primary | HAT-P-27 |
| Companion | HAT-P-27 B |
| Semi-major axis (a) | 0.656±0.021" (131 AU) |
| Details[2] | |
| Mass | 0.945±0.035 M☉ |
| Radius | 0.898+0.054−0.039 R☉ |
| Luminosity | 0.57+0.09−0.07 L☉ |
| Surface gravity (log g) | 4.51±0.04 cgs |
| Temperature | 5300±90 K |
| Metallicity [Fe/H] | 0.29±0.10 dex |
| Rotation | 0.4±0.4 |
| Rotational velocity (v sin i) | 0.6+0.7−0.4[5] km/s |
| Age | 4.4+3.8−2.6 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HAT-P-27, also known as WASP-40, is the primary of a binary star system about 650 light-years away. It is a G-type main-sequence star. The star's age is similar to the Sun's at 4.4 billion years.[2] HAT-P-27 is enriched in heavy elements, having a 195% concentration of iron compared to the Sun.
The very dim stellar companion was detected in 2015 at a projected separation of 0.656″[4] and proven to be physically bound to the system in 2016.[6]
Planetary system
In 2011 a transiting hot Jupiter type planet b was detected in a mildly eccentric orbit. The planetary equilibrium temperature is 1207±41 K.[2] The survey in 2013 failed to find any Rossiter-McLaughlin effect and therefore was unable to constrain the inclination of planetary orbit to the equatorial plane of the parent star.[5] No orbital decay was detected as in 2018, despite the close proximity of the planet to the star.[7]
The presence of an additional planet in the system has been suspected since 2015.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.660±0.033 MJ | 0.0403±0.0005 | 3.039586±0.000012 | 0.078±0.047 | 85.0±0.2[5]° | 1.038+0.077−0.058 RJ |
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "HAT-P-27". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HAT-P-27.
- ↑ 2.0 2.1 2.2 2.3 2.4 Béky, B.; Bakos, G. Á.; Hartman, J.; Torres, G.; Latham, D. W.; Jordán, A.; Arriagada, P.; Bayliss, D. et al. (2011), "HAT-P-27b: A HOT JUPITER TRANSITING A G STAR ON A 3 DAY ORBIT", The Astrophysical Journal 734 (2): 109, doi:10.1088/0004-637X/734/2/109, Bibcode: 2011ApJ...734..109B
- ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 4.0 4.1 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
- ↑ 5.0 5.1 5.2 Brown, D. J. A.; Collier Cameron, A.; Díaz, R. F.; Doyle, A. P.; Gillon, M.; Lendl, M.; Smalley, B.; Triaud, A. H. M. J. et al. (2013), "Analysis of Spin-Orbit Alignment in the Wasp-32, Wasp-38, and Hat-P-27/Wasp-40 Systems", The Astrophysical Journal 760 (2): 139, doi:10.1088/0004-637X/760/2/139
- ↑ 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
- ↑ Penev, Kaloyan; Bouma, L. G.; Winn, Joshua N.; Hartman, Joel D. (2018), "EMPIRICAL TIDAL DISSIPATION IN EXOPLANET HOSTS FROM TIDAL SPIN–UP", The Astronomical Journal 155 (4): 165, doi:10.3847/1538-3881/aaaf71, PMID 31080254, Bibcode: 2018AJ....155..165P
- ↑ Ground-based transit observations of the HAT-P-18,HAT-P-19, HAT-P-27/WASP40 and WASP-21 systems
Coordinates: 
14h 51m 04.1870s, +05° 56′ 50.5482″
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