Astronomy:WASP-71
WASP-71, also named Mpingo, is an ordinary star with a close-orbiting planetary companion in the equatorial constellation of Cetus. With an apparent visual magnitude of 10.56,[1] it is too faint to be visible to the naked eye. This star is located at a distance of 1,160 light-years based on parallax measurements, and is drifting further away with a heliocentric radial velocity of 7.7 km/s.[2]
This is classified as an F-type star with a stellar classification of F8.[3] It is more than double the diameter of the Sun with 1.5 times the Sun's mass. The star is younger than the Sun at about 3.6 billion years,[4] yet is already evolving away from the main sequence.[3] BD+00 316 is enriched in heavy elements, having 140% of the solar abundance of iron.[4] Imaging surveys in 2015 and 2020 failed to find any stellar companions for BD+00 316.[5][6]
Nomenclature
The designation WASP-71 comes from the Wide Angle Search for Planets and has been used since 2012;[3] BD+00 316 is the stellar identifier from the Bonner Durchmusterung catalogue.[7]
The star was named Mpingo by Tanzanian amateur astronomers in 2020 as part of the NameExoWorlds contest, after the mpingo tree (Dalbergia melanoxylon) whose wood is a type of ebony used in musical instruments.[8]
Planetary system
In 2012 a transiting superjovian planet, designated WASP-71b, was detected on a tight, circular orbit.[3] The planetary orbit is well aligned with the equatorial plane of the star, the misalignment angle being equal to −1.9+7.1−7.5°.[4] Its equilibrium temperature is 2,016.1+67.0−52.5 K.[4]
The planet was named Tanzanite by Tanzanian amateur astronomers in 2020 as part of the NameExoWorlds contest, after the mineral also known as tanzanite.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (Tanzanite) | 2.14±0.08 MJ | 0.0460±0.0006 | 2.903676±0.000008 | <0.019[9] | 85.8+2.4−2.1° | 1.35+0.13−0.07 RJ |
References
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedHøg_et_al_2000 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedGaiaDR2 - ↑ 3.0 3.1 3.2 3.3 Smith, A. M. S.; Anderson, D. R.; Bouchy, F.; Collier Cameron, A.; Doyle, A. P.; Fumel, A.; Gillon, M.; Hébrard, G. et al. (2013), "WASP-71b: a bloated hot Jupiter in a 2.9-day, prograde orbit around an evolved F8 star", Astronomy & Astrophysics 552: A120, doi:10.1051/0004-6361/201220727, Bibcode: 2013A&A...552A.120S
- ↑ 4.0 4.1 4.2 4.3 4.4 Brown, D. J. A.; Triaud, A. H. M. J.; Doyle, A. P.; Gillon, M.; Lendl, M.; Anderson, D. R.; Collier Cameron, A.; Hébrard, G. et al. (2016), "Rossiter–McLaughlin models and their effect on estimates of stellar rotation, illustrated using six WASP systems", Monthly Notices of the Royal Astronomical Society 464 (1): 810–839, doi:10.1093/mnras/stw2316, Bibcode: 2017MNRAS.464..810B
- ↑ Wöllert, Maria; Brandner, Wolfgang (2015), "A Lucky Imaging search for stellar sources near 74 transit hosts", Astronomy & Astrophysics 579: A129, doi:10.1051/0004-6361/201526525, Bibcode: 2015A&A...579A.129W
- ↑ Bohn, A. J.; Southworth, J.; Ginski, C.; Kenworthy, M. A.; Maxted, P. F. L.; Evans, D. F. (2020), "A multiplicity study of transiting exoplanet host stars. I. High-contrast imaging with VLT/SPHERE", Astronomy & Astrophysics 635: A73, doi:10.1051/0004-6361/201937127, Bibcode: 2020A&A...635A..73B
- ↑ "BD+00 316". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=BD%2B00+316.
- ↑ 8.0 8.1 The IAU announces names for WASP exoplanets
- ↑ Bonomo, A. S.; Desidera, S.; Benatti, S.; Borsa, F.; Crespi, S.; Damasso, M.; Lanza, A. F.; Sozzetti, A. et al. (2017), "The GAPS Programme with HARPS-N@TNG XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets", Astronomy & Astrophysics A107: 602, doi:10.1051/0004-6361/201629882, Bibcode: 2017A&A...602A.107B
<ref> tag with name "Roman1987" defined in <references> is not used in prior text.Coordinates: 
01h 57m 03.2041s, +00° 45′ 31.8789″
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