WASP-17

{{Starbox begin

| name = WASP-17 / Dìwö

}}

{{Starbox observe

| epoch = J2000.0

| constell = Scorpius

| ra = {{RA|15|59|50.9492}}

| dec = {{Dec|−28|03|42.313}}

| appmag_v = 11.500

}}

{{Starbox character

| class = F6V

| r-i =

| v-r =

| b-v =

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|-48.34|1.07}}

| prop_mo_ra = {{val|−8.263|(29)}}

| prop_mo_dec = {{val|−9.427|(22)}}

| pm_footnote =

| parallax = 2.4811

| p_error = 0.0255

| parallax_footnote =

| absmag_v =

}}

{{Starbox detail

| mass = {{val|1.306|0.026}}

| radius = {{val|1.572|0.056}}

| gravity = 4.14 ± 0.03

| luminosity =

| temperature = 6509 ± 86

| metal_fe = –0.02 ± 0.09

| rotational_velocity = 10.6 ± 1.3

| age_gyr = {{val|2.65|0.25}}

}}

{{Starbox catalog

| names = {{odlist | name=Dìwö | 2MASS=J15595095-2803422 | CD=-27 10695 | TIC=66818296 | TOI=1050 | TYC=6787-1927-1 | WASP=17}}, 1SWASP J155950.94−280342.3

}}

{{Starbox reference

| Simbad = WASP-17

| EPE = WASP-17

| NSTED = WASP-17

}}

WASP-17, also named Dìwö, is an F-type main sequence star approximately 1,310 light-years away in the constellation Scorpius. It hosts the planet WASP-17b.{{Cite web|url=http://www.space.com/scienceastronomy/090812-backward-planet.html|title = Newfound Planet Orbits Backward| website=Space.com |date = 12 August 2009}}

The star, although similar to the Sun in terms of overall contents of heavy elements, is depleted of carbon. The carbon to oxygen molar ratio of 0.18{{±|0.04}} for WASP-17 is well below the solar ratio of 0.55.{{citation|arxiv=2207.13662|year=2022|title=Chemical Abundances for 25 JWST Exoplanet Host Stars with KeckSpec|last1=Polanski |first1=Alex S. |last2=Crossfield |first2=Ian J. M. |last3=Howard |first3=Andrew W. |last4=Isaacson |first4=Howard |last5=Rice |first5=Malena |journal=Research Notes of the American Astronomical Society |volume=6 |issue=8 |page=155 |doi=10.3847/2515-5172/ac8676 |doi-access=free |bibcode=2022RNAAS...6..155P }}

Nomenclature

The planet was discovered by the SuperWASP project, hence the name WASP-17.

This was one of the systems selected to be named in the 2019 NameExoWorlds campaign during the 100th anniversary of the IAU, which assigned each country a star and planet to be named. This system was assigned to Costa Rica. WASP-17 is named Dìwö, which in the Bribri language means the Sun, and its planet is named Ditsö̀.{{Cite web|url=http://www.nameexoworlds.iau.org/final-results|title=Approved names|website=NameExoworlds|language=en|access-date=2020-01-02}}{{Cite web|url=https://www.iau.org/news/pressreleases/detail/iau1912/|title=International Astronomical Union {{!}} IAU|website=www.iau.org|access-date=2020-01-02}}

Planetary system

As of 2009, an exoplanet has been confirmed to orbit the star. The planet, WASP-17b, is unusual in that it is believed to orbit in the opposite direction to the star's spin (a retrograde orbit), and is twice the size of Jupiter, but half its mass.{{Cite news|url=http://news.bbc.co.uk/2/hi/science/nature/8197683.stm|title=New exoplanet orbits 'backwards'|date=August 12, 2009|via=news.bbc.co.uk}}{{Cite web|url=https://news.yahoo.com/s/space/20090812/sc_space/newfoundplanetorbitsbackward|title=New-found Planet Orbits Backward}} The planet is also named Ditsö̀. It is subject to intensive photo-evaporation, and may be completely destroyed within one billion years from now.[https://www.aanda.org/articles/aa/full_html/2011/05/aa16356-10/T2.html D. Ehrenreich and J.-M. Désert, "Mass-loss rates for transiting exoplanets", 2011]

{{OrbitboxPlanet begin

| table_ref =

}}

{{OrbitboxPlanet

| exoplanet = b / Ditsö̀

| mass = {{val|0.512|0.037}}

| semimajor = {{val|0.05151|0.00035}}

| period = {{val|3.7354845|(19)}}

| eccentricity = <0.020

| inclination = {{val|86.83|0.68|0.53}}

| radius = {{val|1.991|0.081}}

}}

References

{{reflist|refs=

{{cite journal | title=WASP-17b: An Ultra-Low Density Planet in a Probable Retrograde Orbit | last1=Anderson | first1=D. R. | last2=Hellier | first2=C. | last3=Gillon | first3=M. | last4=Triaud | first4=A. H. M. J. | last5=Smalley | first5=B. | last6=Hebb | first6=L. | last7=Collier Cameron | first7=A. | last8=Maxted | first8=P. F. L. | last9=Queloz | first9=D. | last10=West | first10=R. G. | last11=Bentley | first11=S. J. | last12=Enoch | first12=B. | last13=Horne | first13=K. | last14=Lister | first14=T. A. | last15=Mayor | first15=M. | last16=Parley | first16=N. R. | last17=Pepe | first17=F. | last18=Pollacco | first18=D. | last19=Ségransan | first19=D. | last20=Udry | first20=S. | last21=Wilson | first21=D. M. | display-authors=1 | journal=The Astrophysical Journal | volume=709 | issue=1 | pages=159–167 | year=2010 | arxiv=0908.1553 | bibcode=2010ApJ...709..159A | doi=10.1088/0004-637X/709/1/159 | s2cid=53628741 }}

{{cite journal | title=UBV(RI)C photometry of transiting planet hosting stars | last1=Maxted | first1=P. F. L. | last2=Koen | first2=C. | last3=Smalley | first3=B. | display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society | volume=418 | issue=2 | pages=1039–1042 | year=2011 | arxiv=1108.0349 | bibcode=2011MNRAS.418.1039M | doi=10.1111/j.1365-2966.2011.19554.x | doi-access=free | s2cid=117056033 }}

{{cite journal | title=Improved Spectroscopic Parameters for Transiting Planet Hosts | last1=Torres | first1=Guillermo | last2=Fischer | first2=Debra A. | last3=Sozzetti | first3=Alessandro | last4=Buchhave | first4=Lars A. | last5=Winn | first5=Joshua N. | last6=Holman | first6=Matthew J. | last7=Carter | first7=Joshua A. | display-authors=1 | journal=The Astrophysical Journal | volume=757 | issue=2 | at=161 | year=2012 | arxiv=1208.1268 | bibcode=2012ApJ...757..161T | doi=10.1088/0004-637X/757/2/161 | s2cid=16580774 }}

{{cite journal |last1=Bonomo |first1=A. S. |last2=Desidera |first2=S. |display-authors=etal |date=June 2017 |title=The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets |journal=Astronomy & Astrophysics |volume=602 |issue= |pages=A107 |doi=10.1051/0004-6361/201629882 |arxiv=1704.00373 |bibcode=2017A&A...602A.107B |s2cid=118923163}}

}}

Category:Scorpius

Category:F-type main-sequence stars

Category:Planetary systems with one confirmed planet

Category:Planetary transit variables