WASP-13

Last updated
WASP-13 / Gloas
Observation data
Epoch J2000       Equinox J2000
Constellation Lynx
Right ascension 09h 20m 24.7145s [1]
Declination +33° 52′ 56.696″ [1]
Apparent magnitude  (V)10.42 [2]
Characteristics
Spectral type G1 V [3]
Astrometry
Radial velocity (Rv)10.00 [1]  km/s
Proper motion (μ)RA: −2.275±0.018 [1]   mas/yr
Dec.: −20.072±0.017 [1]   mas/yr
Parallax (π)4.3310 ± 0.0195  mas [1]
Distance 753 ± 3  ly
(231 ± 1  pc)
Details
Mass 1.2 [1]   M☉
Radius 1.5 [1]   R☉
Luminosity 2.895 [1]   L☉
Surface gravity (log g)4.04±0.2 [2]   cgs
Temperature 6,052 [1]   K
Metallicity [Fe/H]0.0±0.2 [4]   dex
Rotational velocity (v sin i)< 4.9 [2]  km/s
Age 5.1±2.0 [5]   Gyr
Other designations
Gloas, 2MASS J09202471+3352567, GPM 140.102992+33.882691, 1SWASP J092024.70+335256.6, USNO-B1.0 1238-00183620 [6]
Database references
SIMBAD data

WASP-13, also named Gloas, is a star in the Lynx constellation. The star is similar, in terms of metallicity and mass, to the Sun, although it is hotter and most likely older. The star was first observed in 1997, according to the SIMBAD database, and was targeted by SuperWASP after the star was observed by one of the SuperWASP telescopes beginning in 2006. Follow-up observations on the star led to the discovery of planet Cruinlagh in 2008; the discovery paper was published in 2009. [2] [7]

Contents

Observational history

The telescope, housed at the Haute-Provence Observatory, which was used to collect radial velocity measurements OHP telescope193.JPG
The telescope, housed at the Haute-Provence Observatory, which was used to collect radial velocity measurements

According to SIMBAD, WASP-13 was first observed in 1997, when it was catalogued by astronomers measuring the proper motion of stars in regions of the sky where galaxies are detected. [6] Between November 27, 2006, and April 1, 2007, the SuperWASP-North telescope in the Canary Islands observed WASP-13; analysis of the data suggested that a planet could be in the orbit of the star. [2]

Follow-up observations were conducted by a team of British, Spanish, French, Swiss and American astronomers using the photometer on the James Gregory Telescope in Scotland; using visual comparisons to the nearby bright star HD 80408, the star's light curve was better defined. In combination with measurements of WASP-13's spectrum measured using the SOPHIE échelle spectrograph at the Haute-Provence Observatory in France, the star's radial velocity was also discovered. The Fibre-Fed Echelle Spectrograph on the Nordic Optical Telescope gathered additional measurements of WASP-13's spectrum, allowing astronomers to determine WASP-13's characteristics. Use of SOPHIE's data led to the discovery of the planet Cruinlagh in 2008; the planet was reported in 2009. [2]

Based on SIMBAD's archive, WASP-13 was included in ten more papers between its discovery and 2010. [6]

Characteristics

WASP-13 is a sunlike, G-type star that is situated approximately 230 parsecs (750 light years) in the Lynx constellation. With an apparent magnitude of 10.42, the star cannot be seen with the unaided eye from the perspective of someone on Earth. The star's effective temperature, at 5,911  K , is slightly hotter than that of the Sun, and the radius of 1.58  R☉ is also larger, leading to a bolometric luminosity of 2.9  L☉. [1] However, its metallicity is similar; this can be seen in how the logarithm of the concentration of iron, or [Fe/H], is approximately 0. [4] WASP-13 has a mass of 1.2  M☉ and the logarithm of its surface gravity is measured at 4.04  cgs , while the rate at which it rotates is at most 4.9  km/s .

The evolutionary status of WASP-13, as shown from its position in the Hertsprung-Russel diagram is near the main sequence turnoff, and it is considered very close to exhausting its core hydrogen and becoming a subgiant. [1] Comparison with theoretical isochrones and stars with accurately-determined ages gives an age for WASP-13 of around 5.1  Gyr . [4] Earlier estimates had given an older age, but with a very large uncertainty. [2]

Planetary system

WASP-13 has a planet that orbits its host star at a distance of 0.0527 AU, or approximately 5.27% of the mean distance between the Earth and Sun. The planet completes an orbit every 4.35298 days, or approximately 4 days and 8.5 hours. Cruinlagh's estimated mass is 0.46 times the mass of Jupiter, while its radius is about 1.21 times that of the planet. [4]

The WASP-13 planetary system [4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b / Cruinlagh 0.485 +0.058
−0.052  MJ 		0.05379 +0.00059
−0.00077		4.353011±0.0000130——

Naming

The star was designated WASP-13 as it was discovered through the Wide Angle Search for Planets programme.

In 2019 the IAU announced as part of NameExoWorlds that WASP-13 and its planet WASP-13b would be given official names chosen by school children from the UK. [8] [9] The chosen names were Gloas for WASP-13 and Cruinlagh for WASP-13b, the Manx words for 'to shine' and 'to orbit' respectively. [10] [11]


Related Research Articles

HD 83443 is an orange dwarf star approximately 134 light-years away in the constellation of Vela. As of 2000, at least one extrasolar planet has been confirmed to be orbiting the star. The star HD 83443 is named Kalausi. The name was selected in the NameExoWorlds campaign by Kenya, during the 100th anniversary of the IAU. The word Kalausi means a very strong whirling column of wind in the Dholuo language.

HD 4208 is a star in the southern constellation of Sculptor. It has a yellow hue with an apparent visual magnitude of 7.78, making it too dim to be visible to the naked eye. But with binoculars or small telescope it should be an easy target. This object is located at a distance of 111.6 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +57 km/s.

14 Andromedae, abbreviated 14 And, also named Veritate, is a single, orange-hued giant star situated approximately 247 light-years away in the northern constellation of Andromeda. It is dimly visible to the naked eye with an apparent visual magnitude of 5.22. The star is moving closer to the Earth with a heliocentric radial velocity of −60 km/s. In 2008 an extrasolar planet was discovered to be orbiting the star.

HD 17156, named Nushagak by the IAU, is a yellow subgiant star approximately 255 light-years away in the constellation of Cassiopeia. The apparent magnitude is 8.17, which means it is not visible to the naked eye but can be seen with good binoculars. A search for a binary companion star using adaptive optics at the MMT Observatory was negative.

HD 8574 is a single star in the equatorial constellation of Pisces. It can be viewed with binoculars or a telescope, but not with the naked eye having a low apparent visual magnitude of +7.12. The distance to this object is 146 light years based on parallax, and it has an absolute magnitude of 3.88. The star is drifting further away from the Sun with a radial velocity of +18 km/s. It has a relatively high proper motion, advancing across the celestial sphere at the rate of 0.298 arc seconds per annum.

HD 221287, named Poerava, is a star in the southern constellation of Tucana. It has a yellow-white hue but is too faint to be viewed with the naked eye, having an apparent visual magnitude of 7.82. This object is located at a distance of 183 light years from the Sun, as determined from its parallax. It is drifting closer with a radial velocity of −22 km/s.

HD 118203 is a star located in the northern circumpolar constellation of Ursa Major. It has the proper name Liesma, which means flame, and it is the name of a character from the Latvian poem Staburags un Liesma. The name was selected in the NameExoWorlds campaign by Latvia, during the 100th anniversary of the IAU.

WASP-6 is a type-G yellow dwarf star located about 600 light-years away in the Aquarius constellation. Dim at magnitude 12, it is visible through a moderate sized amateur telescope. The star is about 80% of the size and mass of the Sun and it is a little cooler. Starspots in the WASP-6 system helped to refine the measurements of the mass and the radius of the planet WASP-6b.

<span class="mw-page-title-main">WASP-13b</span> Extrasolar planet in the orbit of the star WASP-13

WASP-13b, also known as Cruinlagh, is an extrasolar planet that was discovered in 2008 in the orbit of the sunlike star WASP-13. The planet has a mass of nearly half that of Jupiter, but a radius five-quarters of the size of Jupiter. This low relative mass might be caused by a core that is of low mass or that is not present at all.

HD 20868 is a star in the southern constellation Fornax. With an apparent visual magnitude of 9.92, it is much too dim to be visible to the naked eye. Parallax measurements give a distance estimate of 156 light years from the Sun. It is drifting further away with a radial velocity of +46.2 km/s, having come to within about 124 ly around 312,000 years ago.

HD 48265 is the Henry Draper Catalogue designation for a star in the southern constellation Puppis. It has an apparent visual magnitude of 8.07, which makes it too faint to be seen with the naked eye. Based upon parallax measurements made during the Hipparcos mission, it is located at a distance of roughly 293 light-years from Earth.

<span class="mw-page-title-main">WASP-43b</span> Extrasolar planet in the constellation Sextans

WASP-43b, formally named Astrolábos, is a transiting planet in orbit around the young, active, and low-mass star WASP-43 in the constellation Sextans. The planet is a hot Jupiter with a mass twice that of Jupiter, but with a roughly equal radius. WASP-43b was flagged as a candidate by the SuperWASP program, before they conducted follow-ups using instruments at La Silla Observatory in Chile, which confirmed its existence and provided orbital and physical characteristics. The planet's discovery was published on April 14, 2011.

WASP-43 is a K-type star about 284 light-years away in the Sextans constellation. It is about half the size of the Sun, and has approximately half the mass. WASP-43 has one known planet in orbit, a Hot Jupiter called WASP-43b. At the time of publishing of WASP-43b's discovery on April 15, 2011, the planet was the most closely orbiting Hot Jupiter discovered. The small orbit of WASP-43b is thought to be caused by WASP-43's unusually low mass. WASP-43 was first observed between January and May 2009 by the SuperWASP project, and was found to be cooler and slightly richer in metals than the Sun. WASP-43 has also been found to be an active star that rotates at a high velocity.

HD 106515 is a binary star in the constellation of Virgo.

HD 146389, is a star with a yellow-white hue in the northern constellation of Hercules. The star was given the formal name Irena by the International Astronomical Union in January 2020. It is invisible to the naked eye with an apparent visual magnitude of 9.4 The star is located at a distance of approximately 446 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −9 km/s. The star is known to host one exoplanet, designated WASP-38b or formally named 'Iztok'.

WASP-72 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.

BD+00 316, also known as WASP-71 since 2019, is an F-class main sequence star about 1200 light-years away. The star is younger than the Sun at approximately 3.6 billion years, yet is already close to leaving the main sequence. BD+00 316 is enriched in heavy elements, having 140% of the solar abundance of iron.

WASP-63, also known as CD-38 2551, is a single star with an exoplanetary companion in the southern constellation of Columba. It is too faint to be visible with the naked eye, having an apparent visual magnitude of 11.1. The distance to this system is approximately 942 light-years based on parallax measurements, but it is drifting closer with a radial velocity of −24 km/s.

WASP-60 is a F-type main-sequence star about 1420 light-years away. The stars age is much younger than the Sun's at 1.7±0.5 billion years. WASP-60 is enriched in heavy elements, having 180% of the solar abundance of iron. The star does not have noticeable starspot activity, an unexpected observation for a relatively young star. The age of WASP-60 determined by different methods is highly discrepant though, and it may actually be an old star which experienced an episode of spin-up in the past.

WASP-69, also named Wouri, is a K-type main-sequence star 164 light-years away. Its surface temperature is 4782±15 K. WASP-69 is slightly enriched in heavy elements compared to the Sun, with a metallicity Fe/H index of 0.10±0.01, and is much younger than the Sun at 2 billion years. The data regarding starspot activity of WASP-69 are inconclusive, but spot coverage of the photosphere may be very high.

References

  1. 1 2 3 4 5 6 7 8 9 10 11 12 Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics . arXiv: 2208.00211 . doi: 10.1051/0004-6361/202243940 . Gaia DR3 record for this source at VizieR.
  2. 1 2 3 4 5 6 7 Skillen, I.; et al. (2009). "The 0.5Mj transiting exoplanet WASP-13b". Astronomy and Astrophysics. 502 (1): 391–394. arXiv: 0905.3115 . Bibcode:2009A&A...502..391S. doi:10.1051/0004-6361/200912018. S2CID   16678658.
  3. ↑ Ehrenreich, D.; Désert, J.-M. (2011). "Mass-loss rates for transiting exoplanets". Astronomy & Astrophysics. 529: A136. arXiv: 1103.0011 . Bibcode:2011A&A...529A.136E. doi:10.1051/0004-6361/201016356. S2CID   119302960.
  4. 1 2 3 4 5 Jean Schneider (2009). "Notes for star WASP-13". Extrasolar Planets Encyclopedia. Archived from the original on 5 May 2011. Retrieved 28 May 2011.
  5. ↑ Fossati, L.; et al. (2015). "Far-UV Spectroscopy of the Planet-hosting Star WASP-13: High-energy Irradiance, Distance, Age, Planetary Mass-loss Rate, and Circumstellar Environment". Astrophysical Journal. 815 (2). 118. arXiv: 1512.00552 . Bibcode:2015ApJ...815..118F. doi:10.1088/0004-637X/815/2/118. S2CID   16155184.
  6. 1 2 3 "SIMBAD query result". SIMBAD . Centre de données astronomiques de Strasbourg. 2010. Retrieved 6 June 2011.
  7. ↑ "WASP-13". 2019. Retrieved 6 September 2019.
  8. ↑ "NameExoWorlds". 2019. Retrieved 6 September 2019.
  9. ↑ "IAU UK Exoworld Naming Competition". 2019. Retrieved 6 September 2019.
  10. ↑ "Gloas and Cruinlagh: Planet and star become first with Manx names". BBC News. 17 December 2019.
  11. ↑ "Approved names (§ United Kingdom)". Name Exo Worlds. IAU . Retrieved 19 December 2019.

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