WASP-69#Planetary system

{{Starbox begin

|name=WASP-69 / Wouri

}}

{{Starbox observe

| epoch = J2000

| constell = Aquarius

| ra = {{RA|21|00|06.19682}}

| dec = {{DEC|-05|05|40.0349}}

| appmag_v = 9.87{{±|0.03}}

}}

{{Starbox character

| type = main sequence

| class = K5V{{citation|arxiv=1809.07342|year=2018|doi=10.3847/1538-4365/aae1a3|last1=France|first1=Kevin|last2=Arulanantham|first2=Nicole|last3=Fossati|first3=Luca|last4=Lanza|first4=Antonino F.|last5=Loyd|first5=R. O. Parke|last6=Redfield|first6=Seth|last7=Schneider|first7=P. Christian|title=Far-ultraviolet Activity Levels of F, G, K, and M Dwarf Exoplanet Host Stars|journal=The Astrophysical Journal Supplement Series|volume=239|issue=1|page=16|bibcode=2018ApJS..239...16F|s2cid=119368148 |doi-access=free }}

}}

{{Starbox astrometry

| radial_v = {{val|−9.83|0.13}}

| prop_mo_ra = 33.778

| prop_mo_dec = −93.581

| pm_footnote =

| parallax = 19.8858

| p_error = 0.0170

| parallax_footnote =

}}

{{Starbox detail

| mass = 0.826{{±|0.029}}

| radius = 0.813

| temperature = 4,782{{±|15}}

| luminosity = 0.34

| gravity = 4.59{{±|0.02}}

| metal_fe = 0.10{{±|0.01}}

| rotation = 23.07 d

| rotational_velocity = 1.27{{±|0.22}}

| age_gyr = 2

}}

{{Starbox catalog

| names = {{odlist | name = Wouri | BD=−05 5432 | 2MASS = J21000618-0505398 | GSC=05200-01560 | TYC=5200-1560-1 | WASP = 69}}

}}

{{Starbox reference

| Simbad = BD-05+5432

}}

WASP-69, also named Wouri, is a K-type main-sequence star {{convert|164|ly|pc|lk=on|abbr=off}} away from Earth. 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.

Multiplicity surveys did not detect any stellar companions to WASP-69 as of 2020.{{citation|arxiv=2001.08224|year=2020|title=A multiplicity study of transiting exoplanet host stars. I. High-contrast imaging with VLT/SPHERE|doi=10.1051/0004-6361/201937127|last1=Bohn|first1=A. J.|last2=Southworth|first2=J.|last3=Ginski|first3=C.|last4=Kenworthy|first4=M. A.|last5=Maxted|first5=P. F. L.|last6=Evans|first6=D. F.|journal=Astronomy & Astrophysics|volume=635|pages=A73|bibcode=2020A&A...635A..73B|s2cid=210861118}}

Nomenclature

The designation WASP-69 indicates that this was the 69th star found to have a planet by the Wide Angle Search for Planets.

In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project.{{cite web |url=https://www.nameexoworlds.iau.org/2022exoworlds |title=List of ExoWorlds 2022 |date=8 August 2022 |website=nameexoworlds.iau.org |publisher=IAU |access-date=27 August 2022}} The approved names, proposed by a team from Cameroon, were announced in June 2023. WASP-69 is named Wouri and its planet is named Makombé, after the Wouri and Makombé rivers.

Planetary system

In 2013, one planet, named WASP-69b,{{cite news |last=Andrews |first=Robin George |title=This Distant Planet Has a 350,000-Mile-Long Comet-Like Tail - The stream of helium trailing WASP-69b, a "Hot Jupiter," allows astronomers to study how planets lose their atmospheres. |url=https://www.nytimes.com/2024/01/12/science/wasp-69b-tail-planet.html |date=12 January 2024 |work=The New York Times |url-status=live |archiveurl=https://archive.today/20240112135452/https://www.nytimes.com/2024/01/12/science/wasp-69b-tail-planet.html |archivedate=12 January 2024 |accessdate=12 January 2024 }} was discovered on a tight, circular orbit. Its equilibrium temperature is 886 K, but the measured terminator temperature is significantly higher by at least 200 K. The planet is losing mass at a moderate rate of 0.5 {{Earth mass|sym=y}} per billion years, not producing a visible cometary tail, although it was detected in 2024 and measured to be at least 7 times its own radius.{{cite journal|last1=Tyler|first1=Dakotah|last2=Petigura|first2=Erik A.|last3=Oklopčić|first3=Antonija|last4=David|first4=Trevor J.|date=9 January 2024|title=WASP-69b's Escaping Envelope Is Confined to a Tail Extending at Least 7 R_p|journal=The Astrophysical Journal|volume=960|issue=2|page=123|doi=10.3847/1538-4357/ad11d0|doi-access=free |arxiv=2312.02381 |bibcode=2024ApJ...960..123T }}

The planetary atmosphere is extremely hazy and contains a partial cloud deck with cloud tops rising to a pressure of 100 Pa. Its composition is mostly hydrogen and helium, and sodium was also detected in low concentration.{{citation|arxiv=1710.06479|year=2017|title=Detection of sodium in the atmosphere of WASP-69b|doi=10.1051/0004-6361/201731956|last1=Casasayas-Barris|first1=N.|last2=Palle|first2=E.|last3=Nowak|first3=G.|last4=Yan|first4=F.|last5=Nortmann|first5=L.|last6=Murgas|first6=F.|journal=Astronomy & Astrophysics|volume=608|pages=A135|bibcode=2017A&A...608A.135C|s2cid=67777582}} The sodium may originate from volcanic moons, not from the planet itself.{{citation|arxiv=1908.10732|year=2019|title=Sodium and Potassium Signatures of Volcanic Satellites Orbiting Close-in Gas Giant Exoplanets|doi=10.3847/1538-4357/ab40cc|last1=Oza|first1=Apurva V.|last2=Johnson|first2=Robert E.|last3=Lellouch|first3=Emmanuel|last4=Schmidt|first4=Carl|last5=Schneider|first5=Nick|last6=Huang|first6=Chenliang|last7=Gamborino|first7=Diana|last8=Gebek|first8=Andrea|last9=Wyttenbach|first9=Aurelien|last10=Demory|first10=Brice-Olivier|last11=Mordasini|first11=Christoph|last12=Saxena|first12=Prabal|last13=Dubois|first13=David|last14=Moullet|first14=Arielle|last15=Thomas|first15=Nicolas|journal=The Astrophysical Journal|volume=885|issue=2|page=168|bibcode=2019ApJ...885..168O|s2cid=201651224 |doi-access=free }}

By 2021, the presence of hazes in atmosphere of WASP-69b was confirmed, along with a solar or super-solar water abundance.{{citation|arxiv=2109.06335|year=2021|title=Probing the atmosphere of WASP-69 b with low- and high-resolution transmission spectroscopy|doi=10.1051/0004-6361/202141191 |last1=Khalafinejad |first1=S. |last2=Molaverdikhani |first2=K. |last3=Blecic |first3=J. |last4=Mallonn |first4=M. |last5=Nortmann |first5=L. |last6=Caballero |first6=J. A. |last7=Rahmati |first7=H. |last8=Kaminski |first8=A. |last9=Sadegi |first9=S. |last10=Nagel |first10=E. |last11=Carone |first11=L. |last12=Amado |first12=P. J. |last13=Azzaro |first13=M. |last14=Bauer |first14=F. F. |last15=Casasayas-Barris |first15=N. |last16=Czesla |first16=S. |last17=von Essen |first17=C. |last18=Fossati |first18=L. |last19=Güdel |first19=M. |last20=Henning |first20=Th. |last21=López-Puertas |first21=M. |last22=Lendl |first22=M. |last23=Lüftinger |first23=T. |last24=Montes |first24=D. |last25=Oshagh |first25=M. |last26=Pallé |first26=E. |last27=Quirrenbach |first27=A. |last28=Reffert |first28=S. |last29=Reiners |first29=A. |last30=Ribas |first30=I. |journal=Astronomy & Astrophysics |volume=656 |pages=A142 |bibcode=2021A&A...656A.142K |s2cid=237503489 |display-authors=1 }}

{{OrbitboxPlanet begin

| name = WASP-69

| table_ref =

}}

{{OrbitboxPlanet

| exoplanet = b / Makombé

| mass = {{val|0.260|0.017}}

| radius = {{val|0.945|0.007|0.017}}

| semimajor = {{val|0.04525|0.00053}}

| period = {{val|3.8681382|0.0000017}}

| eccentricity = 0

| inclination = {{val|86.71|0.20}}

}}

References

{{Reflist|refs=

{{cite journal |bibcode=2023ApJS..264...41Y |title=Revised Extinctions and Radii for 1.5 Million Stars Observed by APOGEE, GALAH, and RAVE |last1=Yu |first1=Jie |last2=Khanna |first2=Shourya |last3=Themessl |first3=Nathalie |last4=Hekker |first4=Saskia |last5=Dréau |first5=Guillaume |last6=Gizon |first6=Laurent |last7=Bi |first7=Shaolan |journal=The Astrophysical Journal Supplement Series |date=2023 |volume=264 |issue=2 |page=41 |doi=10.3847/1538-4365/acabc8 |doi-access=free |arxiv=2206.00046 }}

{{cite journal | title=Three newly discovered sub-Jupiter-mass planets: WASP-69b and WASP-84b transit active K dwarfs and WASP-70Ab transits the evolved primary of a G4+K3 binary | date=2014 | last1=Anderson | first1=D. R. | last2=Collier Cameron | first2=A. | last3=Delrez | first3=L. | last4=Doyle | first4=A. P. | last5=Faedi | first5=F. | last6=Fumel | first6=A. | last7=Gillon | first7=M. | last8=Gómez Maqueo Chew | first8=Y. | last9=Hellier | first9=C. | last10=Jehin | first10=E. | last11=Lendl | first11=M. | last12=Maxted | first12=P. F. L. | last13=Pepe | first13=F. | last14=Pollacco | first14=D. | last15=Queloz | first15=D. | last16=Ségransan | first16=D. | last17=Skillen | first17=I. | last18=Smalley | first18=B. | last19=Smith | first19=A. M. S. | last20=Southworth | first20=J. | last21=Triaud | first21=A. H. M. J. | last22=Turner | first22=O. D. | last23=Udry | first23=S. | last24=West | first24=R. G. | journal=Monthly Notices of the Royal Astronomical Society | volume=445 | issue=2 | pages=1114–1129 |arxiv=1310.5654 | doi=10.1093/mnras/stu1737 | doi-access=free |s2cid=54750890 }}

{{cite journal|arxiv=1801.06106|title=The atmospheric parameters of FGK stars using wavelet analysis of CORALIE spectra|year=2018|doi=10.1051/0004-6361/201731954|last1=Gill|first1=S.|last2=Maxted|first2=P. F. L.|last3=Smalley|first3=B.|journal=Astronomy & Astrophysics|volume=612|pages=A111|bibcode=2018A&A...612A.111G|s2cid=119331772}}

{{cite journal|arxiv=2007.02741|year=2020|title=The GTC exoplanet transit spectroscopy survey XI. Possible detection of Rayleigh scattering in the atmosphere of the Saturn-mass planet WASP-69b|doi=10.1051/0004-6361/202038161|last1=Murgas|first1=F.|last2=Chen|first2=G.|last3=Nortmann|first3=L.|last4=Pallé|first4=E.|last5=Nowak|first5=G.|journal=Astronomy & Astrophysics|volume=A158|page=641|bibcode=2020A&A...641A.158M|s2cid=220363912}}

{{cite journal|arxiv=2101.00042|year=2021|title=Metastable Helium Absorptions with 3D Hydrodynamics and Self-consistent Photochemistry. I. WASP-69b, Dimensionality, X-Ray and UV Flux Level, Spectral Types, and Flares|last1=Wang|first1=Lile|last2=Dai|first2=Fei|journal=The Astrophysical Journal|volume=914|issue=2|page=98|doi=10.3847/1538-4357/abf1ee|bibcode=2021ApJ...914...98W |s2cid=230433986 |doi-access=free }}

{{cite web |url=https://www.nameexoworlds.iau.org/2022approved-names |title=2022 Approved Names |website=nameexoworlds.iau.org |publisher=IAU |access-date=7 June 2023}}

}}

Category:Aquarius (constellation)

Category:Planetary transit variables

Category:K-type main-sequence stars

Category:Planetary systems with one confirmed planet