WASP-44

Coordinates: Sky map 00h 15m 37s, −11° 56′ 17″
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WASP-44
Observation data
Epoch J2000      Equinox J2000
Constellation
Cetus
Right ascension 00h 15m 36.76947s[1]
Declination −11° 56′ 17.2848″[1]
Apparent magnitude (V) 13.05[2]
Characteristics
Spectral type G8V[3]
Distance
1,180 ± 8 ly
(362 ± 3 pc)
Details
Gyr
TIC 12862099, WASP-44, GSC 05264-00740, 2MASS J00153675-1156172[2]
Database references
SIMBADdata

WASP-44 is a G-type star about 1,180

WASP-46b on May 17, 2011 by a team of scientists testing the idea that hot Jupiters tend to have circular orbits, an assumption that is made when the orbital eccentricity of such planets are not well-constrained.[3]

Observational history

WASP-44 was observed between July and November 2009 by WASP-South, a station of the

SuperWASP planet-searching program based at the South African Astronomical Observatory. Observations of the star revealed a periodic decrease in its brightness. WASP-South, along with the SuperWASP-North station at the Roque de los Muchachos Observatory on the Canary Islands, collected 15,755 photometric observations, allowing scientists to produce a more accurate light curve.[3] Another set of observations yielded a 6,000 point photometric data set, but the light curve was prepared late and was not considered in the discovery paper.[3]

The South African Astronomical Observatory, base of the WASP-South station, where WASP-44 was first observed

In 2010, a European science team investigated the star using the

spectroscopic binary star, supporting the possibility that the body orbiting WASP-44 was indeed a planet, designated WASP-44b.[3]

The

transited, or crossed in front of, its host star. One transit was detected.[3]

WASP-44, its recently discovered planet, the planets orbiting WASP-45 and WASP-46, and a discussion exploring the validity of the common assumption amongst scientists that closely orbiting hot Jupiter planets have highly circular orbits unless proven otherwise, were reported in a single discovery paper that was published on May 17, 2011 by the Royal Astronomical Society.[3] The paper was submitted to the Monthly Notices of the Royal Astronomical Society on May 16, 2011.[3]

Characteristics

WASP-44 is a

K (cooler than the Sun). However, the star is metal-rich with relation to the Sun. Its measured metallicity is [Fe/H] = 0.06, or 1.148 times that the amount of iron found in the Sun.[6] WASP-44's chromosphere (outermost layer) is not active. The star also does not rotate at a high velocity.[3]

The star has an apparent magnitude of 12.9. It cannot be seen from Earth with the naked eye.[6]

Planetary system

There is one known planet in the orbit of WASP-44:

transit timing variations to search for additional planets was negative.[7]

The WASP-44 planetary system[4]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.860+0.072
−0.068 MJ 		0.03474+0.00040
−0.00043[5] 		2.4238133(23)[5] 0.039+0.047
−0.028 		85.98+0.39
−0.35° 		1.127+0.035
−0.034 RJ

References

  1. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  2. ^ a b "WASP-44". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 December 2023.
  3. ^
    S2CID 34406657
    .
  4. ^
    doi:10.1088/1538-3873/ab03aa
    .
  5. ^
    S2CID 118923163
    .
  6. ^ a b c d Schneider, J. (2011). "Notes for star WASP-44". Extrasolar Planets Encyclopaedia. Archived from the original on June 1, 2011. Retrieved 2011-05-30.
  7. S2CID 119087346
    .


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