WASP-72
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Fornax |
| Right ascension | 02h 44m 09.6098s[1] |
| Declination | −30° 10′ 08.5614″[1] |
| Apparent magnitude (V) | 10.96[1] |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | F7[2] |
| Apparent magnitude (B) | 11.54 [1] |
| Apparent magnitude (G) | 10.8378 [1] |
| Apparent magnitude (R) | 10.47 [1] |
| Astrometry | |
| Radial velocity (Rv) | 37.36 km/s |
| Proper motion (μ) | RA: 7.447[3] mas/yr Dec.: -7.817[3] mas/yr |
| Parallax (π) | 2.2718±0.0440 mas[3] |
| Distance | 1,440 ± 30 ly (440 ± 9 pc) |
| Orbit[4] | |
| Primary | WASP-72 |
| Companion | WASP-72B |
| Semi-major axis (a) | 0.639±0.003" (281 AU) |
| Details[4] | |
| WASP-72 | |
| Mass | 1.386 M☉ |
| Radius | 1.98 R☉ |
| Temperature | 6250 K |
| Rotational velocity (v sin i) | 6.0±2.1[5] km/s |
| Age | 3.55±0.82 Gyr |
| WASP-72B | |
| Mass | 0.66±0.02 M☉ |
| Temperature | 4234+80 −81 K |
| Other designations | |
| Diya, CD−30 1019, Gaia DR2 5065640460769428224, TYC 7011-487-1, 2MASS J02440959-3010085[1] | |
| Database references | |
| SIMBAD | 1019 data |
WASP-72 (also known as CD-30 1019) is a primary of a binary star system. It is F7 class dwarf star, with internal structure just on verge of Kraft break.[5] It is orbited by a planet WASP-72b. The age of WASP-72 is younger than Sun at 3.55±0.82 billion years.[4]
The primary seems to have UV-opaque matter on the line-of-sight, which may originate from atmosphere escaping from WASP-72b or from unknown object in the interstellar medium.[6]
WASP-72 was named Diya in 2019.[7]
A faint stellar companion WASP-72B was discovered in 2020 at projected separation of 281 AU. It may still be a false positive, with probability 0.02%.[4]
Planetary system
The transiting hot Jupiter exoplanet orbiting WASP-72 was discovered by the WASP in 2012.[8] The planetary orbit is well aligned to the equatorial plane of the star, misalignment equal to −7+11
−12°.[5] Despite of the close proximity of the planet to the parent star, an orbital decay was not detected as in 2020.[9]
The planet was named "Cuptor" in 2019 my Mauritian amateur astronomers as part of NameExoWorlds contest.[7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | — | 0.0344±0.0046 | 2.216789+0.000041 −0.000054 |
0 | 79.9+1.6 −1.3° |
1.24±0.15 RJ |
References
- ^ a b c d e f g "CD-30 1019". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ a b Systematic phase curve study of known transiting systems from year one of the TESS mission, 2020, arXiv:2003.06407
- ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d A multiplicity study of transiting exoplanet host stars. I. High-contrast imaging with VLT/SPHERE, 2020, arXiv:2001.08224
- ^ a b c Stellar Obliquities and Planetary Alignments (SOPA). I. Spin-orbit measurements of three transiting hot Jupiters: WASP-72b, WASP-100b, and WASP-109b, 2018, arXiv:1809.00314
- ^ SALT observations of the chromospheric activity of transiting planet hosts: mass-loss and star–planet interactions
- ^ a b "Methodology | IAU100 Name ExoWorlds - An IAU100 Global Event". Name Exoworlds. International Astronomical Union. Retrieved 2020-11-10.
- ^ WASP-64b and WASP-72b: two new transiting highly irradiated giant planets, 2012, arXiv:1210.4257
- ^ The continuing search for evidence of tidal orbital decay of hot Jupiters, 2020, arXiv:2002.02606
