WASP-72
Star in the constellation Fornax
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WASP-72 (also known as CD-30 1019 and officially named Diya) is the primary of a binary star system. It is an F7 class dwarf star, with an internal structure just on the verge of the Kraft break.[7] It is orbited by a planet, WASP-72b. The age of WASP-72 is younger than the Sun at 3.55±0.82 billion years.[5]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Fornax[1] |
| Right ascension | 02h 44m 09.60960s[2] |
| Declination | −30° 10′ 08.5637″[2] |
| Apparent magnitude (V) | 10.96[3] |
| Characteristics | |
| Spectral type | F7[4] |
| Apparent magnitude (B) | 11.454[3] |
| Apparent magnitude (R) | 10.47[3] |
| Apparent magnitude (I) | 10.428[3] |
| Astrometry | |
| Radial velocity (Rv) | 36.20±0.31[2] km/s |
| Proper motion (μ) | RA: +7.614 mas/yr[2] Dec.: −7.673 mas/yr[2] |
| Parallax (π) | 2.3889±0.0252 mas[2] |
| Distance | 1,370 ± 10 ly (419 ± 4 pc) |
| Orbit[5] | |
| Primary | WASP-72 |
| Name | WASP-72B |
| Semi-major axis (a) | 0.639±0.003" (281 AU) |
| Details[6] | |
| WASP-72 | |
| Mass | 1.386±0.055 M☉ |
| Radius | 1.98±0.24 R☉ |
| Luminosity | 5.3+1.5 −1.3 L☉ |
| Surface gravity (log g) | 4.08±0.13 cgs |
| Temperature | 6250±100 K |
| Metallicity [Fe/H] | −0.06±0.09 dex |
| Rotational velocity (v sin i) | 6.0±0.7 km/s |
| Age | 3.55±0.82[5] Gyr |
| WASP-72B | |
| Mass | 0.66±0.02[5] M☉ |
| Temperature | 4234+80 −81[5] K |
| Other designations | |
| Diya, CD−30 1019, TOI-264, TIC 122612091, WASP-72, TYC 7011-487-1, 2MASS J02440959-3010085[3] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
The primary seems to have UV-opaque matter in the line-of-sight, which may originate from atmosphere escaping from WASP-72b or from an unknown object in the interstellar medium.[8] WASP-72 was named Diya in 2019.[9]
A faint stellar companion WASP-72B was discovered in 2020 at a projected separation of 281 AU. It may still be a false positive, with a probability of 0.02%.[5]
Planetary system
The transiting hot Jupiter exoplanet orbiting WASP-72 was discovered by WASP in 2012.[6] The planetary orbit is well aligned to the equatorial plane of the star, with misalignment equal to −7°+11°
−12°.[7] Despite the close proximity of the planet to the parent star, orbital decay was not detected as of 2020.[10] The planetary equilibrium temperature is 2210+120
−130 K,[6] compatible with the measured dayside temperature of 2098+335
−364 K.[11]
WASP-72b was named "Cuptor" in 2019 by Mauritian amateur astronomers as part of the NameExoWorlds contest.[9]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Cuptor | 1.446+0.054 −0.053 MJ |
0.03711+0.00048 −0.00051 |
2.2167421(81) | <0.017 | 79.9+1.6 −1.3[4]° |
1.24±0.15[4] RJ |