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. 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.

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. WASP-72 was named Diya in 2019.

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%.

Planetary system

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

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

References