WASP-72

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.^[6] 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.^[4]

WASP-72 / Diya

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Fornax
Right ascension	02h 44m 09.60960s[1]
Declination	−30° 10′ 08.5637″[1]
Apparent magnitude (V)	10.96[2]
Characteristics
Evolutionary stage	main-sequence star
Spectral type	F7[3]
Apparent magnitude (B)	11.454[2]
Apparent magnitude (R)	10.47[2]
Apparent magnitude (I)	10.428[2]
Astrometry
Radial velocity (Rv)	36.20±0.31[1] km/s
Proper motion (μ)	RA: +7.614 mas/yr[1] Dec.: −7.673 mas/yr[1]
Parallax (π)	2.3889±0.0252 mas[1]
Distance	1,370 ± 10 ly (419 ± 4 pc)
Orbit[4]
Primary	WASP-72
Companion	WASP-72B
Semi-major axis (a)	0.639±0.003" (281 AU)
Details[5]
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[4] Gyr
WASP-72B
Mass	0.66±0.02[4] M☉
Temperature	4234+80 −81[4] K
Other designations
Diya, CD−30 1019, TOI-264, TIC 122612091, WASP-72, TYC 7011-487-1, 2MASS J02440959-3010085[2]
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.^[7] WASP-72 was named Diya in 2019.^[8]

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%.^[4]

Planetary system

The transiting hot Jupiter exoplanet orbiting WASP-72 was discovered by WASP in 2012.^[5] The planetary orbit is well aligned to the equatorial plane of the star, with misalignment equal to −7°+11°
−12°.^[6] Despite the close proximity of the planet to the parent star, orbital decay was not detected as of 2020.^[9] The planetary equilibrium temperature is 2210⁺¹²⁰
₋₁₃₀ K,^[5] compatible with the measured dayside temperature of 2098⁺³³⁵
₋₃₆₄ K.^[10]

WASP-72b was named "Cuptor" in 2019 by Mauritian amateur astronomers as part of the NameExoWorlds contest.^[8]

The WASP-72 planetary system^[11]

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[3]°	1.24±0.15[3] RJ