WASP-43b

Nomenclature

In August 2022, this planet and its host star were included among 20 systems to be named by the third NameExoWorlds project. The approved names, proposed by a team from Romania, were announced in June 2023. WASP-43b is named Astrolábos and its host star is named Gnomon, after the gnomon and the Greek word for the astrolabe.

Observational history

WASP-43 was first flagged as host to a potential transiting event (when a body crosses in front of and dims its host star) by data collected by SuperWASP, a British organization working to discover transiting planets across the entirety of the sky. In particular, WASP-43 was observed first by the leg of WASP-South at the South African Astronomical Observatory between January and May 2009.

Later observation by both SuperWASPs in the Northern and Southern Hemispheres led to the collection of 13,768 data points between January and May 2010 and to the use of the CORALIE spectrograph at La Silla Observatory in Chile. Fourteen measurements using the radial velocity method confirmed WASP-43b as a planet, revealing its mass in the process. The use of La Silla's TRAPPIST telescope helped the science team working on the planet to create a light curve of the planet's transit in December 2010.

The initial discovery was published in the journal Astronomy and Astrophysics in 2011. and a full observation of the phases of the planet later that year.

Host star

Main article: WASP-43

WASP-43 is a K-type star in the Sextans constellation that is about 80 parsecs (261 light years) away. The star has a mass 0.58 times that of the Sun, but is more diffuse, with a radius 0.93 times that of the Sun. The star's effective temperature is 4,400 K, making the star cooler than the Sun, and is metal-poor with regards to the Sun because it has a metallicity of [Fe/H] = −0.05 (89% the amount of iron in the Sun). The star is young, and is estimated to be 598 million years old (as compared to the Sun's 4.6 billion years). Analysis of emission lines indicate that WASP-43 is an active star.

WASP-43 has one detected planet in its orbit, WASP-43b. The star has an apparent magnitude of 12.4, and thus is too faint to be seen with the unaided eye from Earth.

Characteristics

WASP-43b is a dense hot Jupiter with a mass 2.05 times the mass of Jupiter, but a radius 1.036 times that of Jupiter's. The planet orbits its host star at a mean distance of 0.01526 AU every 0.813478 days (19.5235 hours); this orbital period, at the time of WASP-43b's discovery, was the second-shortest orbit yet detected, surpassed only by WASP-19b. In comparison, Mercury has an orbital period of 87.97 days and lies at a mean distance of 0.387 AU from the Sun. In addition, WASP-43b had the closest orbit to its host star (among hot Jupiters) at the time of its discovery, comparable only to the super-Earth planet GJ 1214 b and to the planetary candidate orbiting KOI-961 (confirmed a year later as Kepler-42). While hot Jupiters are known to have small orbital periods, planets with exceptionally small periods below three or four days are extremely rare; however, in the case of WASP-43b, the planet's proximity can be explained because its host star has a very low mass. The rarity of systems like that of WASP-43 and its planet suggest that hot Jupiters do not usually occur around low-mass stars, or that such planets cannot maintain stable orbits around such stars.

WASP-43b, along with the planets WASP-19b and WASP-18b, conflicted with currently accepted models of tidal movements derived from observations of the orbits of binary star systems. Revisions to the model with regard to planets were proposed to help the models conform to the orbital parameters of these planets. Updated orbital period measurements have failed to detect orbital decay as of 2021.

Atmosphere

In 2019, the spectrum of WASP-43b was taken, with the best fit being water-containing clouds without significant amounts of alkali metals. In 2020, further analysis of the spectra revealed the presence of bivalent aluminum oxide (AlO) and water in the atmosphere, while carbon monoxide, carbon dioxide and methane were not detected. Climate modelling suggests the carbon monoxide concentration may be variable, while the atmospheric spectrum of WASP-43b is dominated by clouds made of refractory mineral particles, with a small contribution from hydrocarbon haze. Carbon to oxygen ratio in the planet (0.75) is elevated compared to the Solar ratio of 0.55. The planet is very dark overall, with no clouds on the dayside

There is a large difference in temperature between dayside (1479 K) and nightside (755 K).

References

References

1. (8 August 2022). "List of ExoWorlds 2022". [[International Astronomical Union.
2. (2014). "Broad-band transmission spectrum and K-band thermal emission of WASP-43b as observed from the ground". Astronomy and Astrophysics.
3. (2015-04-22). "Hubble Maps the Temperature and Water Vapor on an Extreme Exoplanet".
4. (2021). "Is the orbit of the exoplanet WASP-43b really decaying? TESS and MuSCAT2 observations confirm no detection". Monthly Notices of the Royal Astronomical Society.
5. (2021). "Investigation of Orbital Decay and Global Modeling of the Planet WASP-43 B". The Astronomical Journal.
6. (2019). "ACCESS: A Visual to Near-infrared Spectrum of the Hot Jupiter WASP-43b with Evidence of H₂O, but no evidence of Na or K". The Astronomical Journal.
7. (2020). "Aluminium oxide in the atmosphere of hot Jupiter WASP-43b". Astronomy & Astrophysics.
8. (2020). "Mineral cloud and hydrocarbon haze particles in the atmosphere of the hot Jupiter JWST target WASP-43b". Astronomy & Astrophysics.
9. (2022). "Exoplanet Atmosphere Retrievals in 3D Using Phase Curve Data with ARCiS: Application to WASP-43b". Astronomy & Astrophysics.
10. (30 April 2024). "NASA's Webb Maps Weather on Planet 280 Light-Years Away - NASA Science".
11. Jean Schneider. (2011). "Notes for star WASP-43".
12. (2011). "WASP-43b: The closest-orbiting hot Jupiter". [[Astronomy and Astrophysics]].
13. David Williams. (17 November 2010). "Mercury Fact Sheet". [[NASA]].
14. (2012). "The TRAPPIST survey of southern transiting planets. I. Thirty eclipses of the ultra-short period planet WASP-43 b". [[Astronomy and Astrophysics]].
15. (2021). "The Dark World: A Tale of WASP-43b in Reflected Light with HST WFC3/UVIS". The Astronomical Journal.
16. (2023). "A Lack of Variability between Repeated Spitzer Phase Curves of WASP-43b". The Astronomical Journal.
17. "2022 Approved Names". [[International Astronomical Union.