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{{Short description|Extrasolar planet that has an orbital period of less than one day}} |
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{{Planetbox begin |
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{{Infobox planet |
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| name = WASP-18b |
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| name = WASP-18b |
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| image = Exoplanet Comparison WASP-18 b.png |
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| caption = Size comparison of WASP-18b with Jupiter. |
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<!-- DISCOVERY --> |
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| discovery_ref = <ref name="Hellier2009" /> |
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| discoverer = Hellier et al. ([[SuperWASP]]) |
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| discovered = August 27, 2009 |
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| discovery_method = [[Astronomical transit|Transit]] (including secondary eclipses) |
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<!-- DESIGNATIONS --> |
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<!-- ORBITAL --> |
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| orbit_ref = <ref name="Cortés-Zuleta2020"/> |
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| apsis = astron |
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| aphelion = |
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| perihelion = |
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| semimajor = {{convert|0.02024|±|0.00030|AU|km|abbr=on}} |
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| eccentricity = {{val|0.0051|0.0070|0.0037}} |
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| period = {{val|0.94145223|(24)|ul=d}}<br />22.59485352 [[hour|h]] |
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| inclination = {{val|83.5|2.0|1.6|u=deg}} |
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| arg_peri = {{val|−85|72|96|u=deg}} |
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| semi-amplitude = {{val|1814|23|24|ul=m/s}} |
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| star = [[WASP-18]] |
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<!-- PHYS CHARS --> |
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| physical_ref = <ref name="Cortés-Zuleta2020"/> |
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| mean_radius = {{val|1.240|0.079|ul=Jupiter radius}} |
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| mass = {{val|10.20|0.35|ul=Jupiter mass}} |
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| density = {{val|6.6|1.2|1.1|ul=g/cm3}} |
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| single_temperature = {{val|3029|50|ul=K|fmt=commas}} ({{convert|3029|K|C F|disp=out}})<ref name=Wong2020/><br>{{val|2781|25|13|u=K|fmt=commas}} ({{convert|2781|K|C F|disp=out}})<ref name="Coulombe2023"/> |
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<!-- ATMOSPHERE --> |
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<!-- NOTES --> |
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}} |
}} |
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'''WASP-18b''' is an [[exoplanet]] that is notable for having an orbital period of less than one day. It has a mass equal to 10 [[Jupiter mass]]es,<ref name="Hellier2009" /> just below the boundary line between planets and [[brown dwarf]]s (about 13 Jupiter masses). Due to [[Tidal acceleration#Tidal deceleration|tidal deceleration]], it is expected to spiral toward and eventually merge with its host star, [[WASP-18]], in less than a million years.<ref name="Hellier2009" /> The planet is approximately {{Convert|3.1|e6km|e6mi AU|lk=on|abbr=unit}} from its star, which is about {{convert|400|ly|pc|abbr=off|lk=on}} from Earth. A team led by Coel Hellier, a professor of astrophysics at [[Keele University]] in England, discovered the exoplanet in 2009.<ref name="Hellier2009" /> |
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{{Planetbox image |
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| image = Exoplanet Comparison WASP-18 b.png |
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Scientists at Keele and at the [[University of Maryland]] are working to understand whether the discovery of this planet so shortly before its expected demise (with less than 0.1% of its lifetime remaining) was fortuitous, or whether tidal dissipation by WASP-18 is actually much less efficient than astrophysicists typically assume.<ref name="Hellier2009" /><ref name="Hamilton"/> Observations made over the next decade should yield a measurement of the rate at which WASP-18b's orbit is decaying.<ref name="Thompson"/> |
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| caption = Size comparison of WASP-18b with Jupiter. |
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}} |
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The closest example of a similar situation in the [[Solar System]] is [[Mars]]' moon [[Phobos (moon)|Phobos]]. Phobos orbits Mars at a distance of only about {{convert|9000|km|mi|abbr=on}}, 40 times closer than the Moon is to the Earth<ref>Johnson, John Jr.; [http://www.latimes.com/news/nationworld/nation/la-sci-planet27-2009aug27,0,5882308.story Astrophysicists puzzle over planet that's too close to its sun], ''Los Angeles Times'' (August 27, 2009).</ref> and is expected to be destroyed in about eleven million years.<ref>{{cite arXiv |
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{{Planetbox star |
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| last = Sharma | first = Bijay Kumar |
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| star = [[WASP-18]] |
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| title = Theoretical Formulation of the Phobos, moon of Mars, rate of altitudinal loss |
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| constell = [[Phoenix (constellation)|Phoenix]]<ref name="cz">{{cite web |
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| date = 2008-05-10 |
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| title=WASP-18b |
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| eprint = 0805.1454 |
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| work=Exoplanet Transit Database |
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| class = astro-ph |
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| url=http://var2.astro.cz/ETD/etd.php?STARNAME=WASP-18&PLANET=b |
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}}</ref> |
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| RA = {{RA|01|37|24.95}}<ref name="cz" /> |
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The planet's dayside temperature, as measured in 2020, is {{Convert|3029|±|50|K|C F|lk=on}}.<ref name=Wong2020/> A 2023 study found an average dayside temperature of {{val|2781|25|13|u=K|fmt=commas}} ({{convert|2781|K|C F|disp=out}}).<ref name="Coulombe2023"/> |
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| DEC = {{DEC|-45|40|40.8}}<ref name="cz" /> |
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| app_mag = 9.29<ref name="cz" /> |
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A study in 2012, utilizing the [[Rossiter–McLaughlin effect]], determined that the planetary orbit is well aligned with the equatorial plane of the star, with a misalignment equal to 13{{±|7}}°.<ref name="Albrecht2012"/> |
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| dist_ly = 325 |
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| dist_pc = 100 ± 10<ref name="EPE" /> |
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A 2017 study detected [[carbon monoxide]] in the planet's atmosphere, without signs of [[water vapor]].<ref name="Sheppard2017"/><ref name="NASA-20171129a"/> However, in 2023, the [[James Webb Space Telescope]] detected water vapor in the planet's atmosphere.<ref name="Coulombe2023"/><ref>{{Cite web |date=2023-06-01 |title=Webb telescope discovers traces of water in atmosphere of exoplanet with mass of 10 Jupiters |url=https://www.cbsnews.com/news/webb-telescope-discovers-traces-of-water-in-atmosphere-of-exoplanet-with-mass-of-10-jupiters/ |access-date=2023-06-12 |website=www.cbsnews.com |language=en-US}}</ref> |
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| class = F6<ref name="EPE" /> |
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| mass = 1.25<ref>[http://exep.jpl.nasa.gov/atlas/atlas_profile.cfm?Star=474 PlanetQuest: WASP-18 b]</ref> |
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[[File:PIA22087-Exoplanet-Wasp18b-COinStratosphere-20171129.jpg|thumb|center|300px|{{center|Exoplanet WASP-18b − high [[carbon monoxide]] levels detected in [[stratosphere]] (artist concept)<ref name="NASA-20171129a"/>}}]] |
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}} |
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{{Planetbox orbit |
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== See also == |
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| semimajor = 0.02026 ± 0.00068<ref name="EPE">{{cite web |url=http://exoplanet.eu/planet.php?p1=WASP-18&p2=b |title=Notes for planet WASP-18b |work=The Extrasolar Planets Encyclopaedia |accessdate=2009-09-15 }}</ref> |
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* [[SuperWASP]] |
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| periastron = 0.02007 |
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| apastron = 0.02045 |
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== References == |
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| period = 0.94145299<ref name="cz"/> |
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{{reflist|refs= |
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| period_hour = 22.59487 |
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| eccentricity = 0.0092 ± 0.0028<ref name="EPE" /> |
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| inclination = 86 ± 2.5<ref name="EPE" /> |
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| arg_peri = 96 ± 10<ref name="EPE" /> |
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| t_transit = 2454221.48163 ± 0.00038<ref name="EPE" /> |
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}} |
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{{Planetbox character |
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| mass = 10.3 ± 0.69<ref name="EPE" /> |
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| radius = 1.106{{±|0.072|0.054}}<ref name="EPE" /> |
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}} |
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{{Planetbox discovery |
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| discovery_date = August 27, 2009<ref name="Hellier2009" /> |
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| discoverers = Hellier et al. ([[SuperWASP]])<ref name="Hellier2009" /> |
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| discovery_site = |
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| discovery_method = [[Astronomical transit|Transit]]<ref name="Hellier2009" /> (including secondary eclipses) |
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| detection_methods = Radial velocity |
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| discovery_status = Published<ref name="Hellier2009" /> |
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}} |
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{{Planetbox catalog |
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| names = HD 10069 b, HIP 7562 b |
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}} |
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{{Planetbox reference |
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| star = WASP-18 |
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| planet = b |
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}} |
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{{Planetbox end}} |
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<ref name="Hellier2009">{{cite journal | title=An orbital period of 0.94days for the hot-Jupiter planet WASP-18b | url=http://orbi.ulg.ac.be/bitstream/2268/28276/1/nature08245.pdf | last1=Hellier | first1=Coel | last2=Anderson | first2=D. R. | last3=Collier Cameron | first3=A. | last4=Gillon | first4=M. | last5=Hebb | first5=L. | last6=Maxted | first6=P. F. L. | last7=Queloz | first7=D. | last8=Smalley | first8=B. | last9=Triaud | first9=A. H. M. J. | last10=West | first10=R. G. | last11=Wilson | first11=D. M. | last12=Bentley | first12=S. J. | last13=Enoch | first13=B. | last14=Horne | first14=K. | last15=Irwin | first15=J. | last16=Lister | first16=T. A. | last17=Mayor | first17=M. | last18=Parley | first18=N. | last19=Pepe | first19=F. | last20=Pollacco | first20=D. L. | last21=Segransan | first21=D. | last22=Udry | first22=S. | last23=Wheatley | first23=P. J. | display-authors=1 | journal=Nature | volume=460 | issue=7259 | pages=1098–1100 | year=2009 | bibcode=2009Natur.460.1098H | doi=10.1038/nature08245 | pmid=19713926| hdl=2268/28276 | s2cid=205217669 }}</ref> |
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'''WASP-18b''' is an [[extrasolar planet]] that is notable for having an orbital period of less than one day. It has a mass equal to 10 [[Jupiter mass]]es,<ref name="Hellier2009" /> just below the boundary line between planets and [[brown dwarf]]s, about 13 Jupiter masses. Due to [[Tidal acceleration#Tidal deceleration|tidal deceleration]], it is expected to spiral towards and eventually merge with its host star, [[WASP-18]], in less than a million years.<ref name="Hellier2009" /> The planet is approximately 3.1 million kilometres (1.9 million miles) from its star, which is about 325 [[light-year]]s from Earth. It was discovered by a team led by Coel Hellier, a professor of astrophysics at [[Keele University]] in England.<ref name="Hellier2009" /> |
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<ref name="Hamilton">{{cite journal |
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Scientists at Keele and at the [[University of Maryland]] are working to understand whether the discovery of this planet so shortly before its expected demise (with less than 0.1% of its lifetime remaining) was fortuitous, or whether tidal dissipation by WASP-18 is actually much less efficient than astrophysicists typically assume.<ref name="Hellier2009" /><ref name="Hamilton">{{cite journal |
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| last = Hamilton |
| last = Hamilton |
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| first = Douglas P. |
| first = Douglas P. |
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Line 65: | Line 69: | ||
| publisher = [[Nature Publishing Group]] |
| publisher = [[Nature Publishing Group]] |
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| date = 2009-08-27 |
| date = 2009-08-27 |
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| url = http://www.nature.com/nature/journal/v460/n7259/full/4601086a.html |
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| doi = 10.1038/4601086a |
| doi = 10.1038/4601086a |
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| pmid = 19713920 |bibcode = 2009Natur.460.1086H | s2cid = 6247145 |
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| accessdate = 2009-08-28 |
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}}</ref> |
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| pmid = 19713920 |bibcode = 2009Natur.460.1086H }}</ref> Observations made over the next decade should yield a measurement of the rate at which WASP-18b's orbit is decaying.<ref name="Thompson">{{cite web |
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<ref name="Thompson">{{cite web |
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| last = Thompson |
| last = Thompson |
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| first = Andrea |
| first = Andrea |
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| authorlink = |
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| title = Newfound Planet Might Be Near Death |
| title = Newfound Planet Might Be Near Death |
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| work = Space.Com |
| work = Space.Com |
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| date = 2009-08-26 |
| date = 2009-08-26 |
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| url = http://www.space.com/scienceastronomy/090826-strange-planet.html |
| url = http://www.space.com/scienceastronomy/090826-strange-planet.html |
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| access-date = 2009-08-28}}</ref> |
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| doi = |
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| accessdate = 2009-08-28}}</ref> |
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<ref name="Albrecht2012">{{citation|arxiv=1206.6105|title=Obliquities of Hot Jupiter Host Stars: Evidence for Tidal Interactions and Primordial Misalignments|year=2012|doi=10.1088/0004-637X/757/1/18 |last1=Albrecht |first1=Simon |last2=Winn |first2=Joshua N. |last3=Johnson |first3=John A. |last4=Howard |first4=Andrew W. |last5=Marcy |first5=Geoffrey W. |last6=Butler |first6=R. Paul |last7=Arriagada |first7=Pamela |last8=Crane |first8=Jeffrey D. |last9=Shectman |first9=Stephen A. |last10=Thompson |first10=Ian B. |last11=Hirano |first11=Teruyuki |last12=Bakos |first12=Gaspar |last13=Hartman |first13=Joel D. |journal=The Astrophysical Journal |volume=757 |issue=1 |page=18 |bibcode=2012ApJ...757...18A |s2cid=17174530 }}</ref> |
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The closest example of a similar situation in the [[Solar System]] is [[Mars]]' moon [[Phobos (moon)|Phobos]]. Phobos orbits Mars at a distance of only about {{convert|9,000|km|mi|abbr=on}}, 40 times closer than the Moon is to the Earth,<ref>Johnson, John Jr.; [http://www.latimes.com/news/nationworld/nation/la-sci-planet27-2009aug27,0,5882308.story Astrophysicists puzzle over planet that's too close to its sun], ''Los Angeles Times'' (August 27, 2009).</ref> and is expected to be destroyed in about eleven million years.<ref>{{cite arXiv |
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| last = Sharma | first = Bijay Kumar |
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| title = Theoretical Formulation of the Phobos, moon of Mars, rate of altitudinal loss |
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| date = 2008-05-10 |
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| eprint = 0805.1454 |
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| class = astro-ph |
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}}</ref> |
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<!-- |
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[[File:PIA22087-Exoplanet-Wasp18b-COinStratosphere-20171129.jpg|thumb|center|300px|<center>Exoplanet WASP-18b − high [[carbon monoxide]] levels detected in [[stratosphere]] (artist concept)<ref name="NASA-20171129a">{{cite web |last1=Landau |first1=Elizabeth |last2=Zubritsky |first2=Elizabeth |title=Exoplanet Has Smothering Stratosphere Without Water |url=https://www.jpl.nasa.gov/news/news.php?feature=7012 |date=29 November 2017 |work=[[NASA]] |accessdate=29 November 2017 }}</ref> |
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<ref name="Zhou2015">{{cite journal|arxiv=1509.04147|doi=10.1093/mnras/stv2138|title=Secondary eclipse observations for seven hot-Jupiters from the Anglo-Australian Telescope|year=2015|last1=Zhou|first1=G.|last2=Bayliss|first2=D. D. R.|last3=Kedziora-Chudczer|first3=L.|last4=Tinney|first4=C. G.|last5=Bailey|first5=J.|last6=Salter|first6=G.|last7=Rodriguez|first7=J.|journal=Monthly Notices of the Royal Astronomical Society|volume=454|issue=3|pages=3002–3019|bibcode=2015MNRAS.454.3002Z}}</ref> |
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</center>]] |
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--> |
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== See also == |
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* [[SuperWASP]] |
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<ref name="Sheppard2017">{{cite journal |last1=Sheppard |first1=Kyle B. |last2=Mandell |first2=Avi M. |display-authors=etal |date=December 2017 |title=Evidence for a Dayside Thermal Inversion and High Metallicity for the Hot Jupiter WASP-18b |journal=[[The Astrophysical Journal Letters]] |volume=850 |issue=2 |pages=L32 |doi=10.3847/2041-8213/aa9ae9 |arxiv=1711.10491 |bibcode=2017ApJ...850L..32S |doi-access=free }}</ref> |
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== References == |
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{{reflist|refs= |
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<ref name="NASA-20171129a">{{cite web |last1=Landau |first1=Elizabeth |last2=Zubritsky |first2=Elizabeth |title=Exoplanet Has Smothering Stratosphere Without Water |url=https://www.jpl.nasa.gov/news/news.php?feature=7012 |date=29 November 2017 |work=[[NASA]] |access-date=29 November 2017 }}</ref> |
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<ref name="Hellier2009">{{cite journal | title=An orbital period of 0.94days for the hot-Jupiter planet WASP-18b | url=http://orbi.ulg.ac.be/bitstream/2268/28276/1/nature08245.pdf | format=PDF | last1=Hellier | first1=Coel | last2=Anderson | first2=D. R. | last3=Collier Cameron | first3=A. | last4=Gillon | first4=M. | last5=Hebb | first5=L. | last6=Maxted | first6=P. F. L. | last7=Queloz | first7=D. | last8=Smalley | first8=B. | last9=Triaud | first9=A. H. M. J. | last10=West | first10=R. G. | last11=Wilson | first11=D. M. | last12=Bentley | first12=S. J. | last13=Enoch | first13=B. | last14=Horne | first14=K. | last15=Irwin | first15=J. | last16=Lister | first16=T. A. | last17=Mayor | first17=M. | last18=Parley | first18=N. | last19=Pepe | first19=F. | last20=Pollacco | first20=D. L. | last21=Segransan | first21=D. | last22=Udry | first22=S. | last23=Wheatley | first23=P. J. | display-authors=1 | journal=Nature | volume=460 | issue=7259 | pages=1098–1100 | year=2009 | bibcode=2009Natur.460.1098H | doi=10.1038/nature08245 | pmid=19713926}}</ref> |
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<!-- |
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<ref name="McDonald2018">{{cite journal | title=Pre-discovery transits of the exoplanets WASP-18b and WASP-33b from Hipparcos | last1=McDonald | first1=I. | last2=Kerins | first2=E. | journal=Monthly Notices of the Royal Astronomical Society: Letters | volume=477 | issue=1 | pages=L21–L24 | year=2018 | arxiv=1803.06187 | bibcode=2018MNRAS.477L..21M | doi=10.1093/mnrasl/sly045 }}</ref> |
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--> |
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<ref name="Cortés-Zuleta2020">{{cite journal |last1=Cortés-Zuleta |first1=Pía |last2=Rojo |first2=Patricio |display-authors=etal |date=April 2020 |title=TraMoS. V. Updated ephemeris and multi-epoch monitoring of the hot Jupiters WASP-18Ab, WASP-19b, and WASP-77Ab |journal=[[Astronomy & Astrophysics]] |volume=636 |issue= |pages=A98 |doi=10.1051/0004-6361/201936279 |arxiv=2001.11112 |bibcode=2020A&A...636A..98C|s2cid=241596186 }}</ref> |
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<ref name=Wong2020>{{citation|arxiv=2003.06407|title=Systematic Phase Curve Study of Known Transiting Systems from Year One of the TESS Mission|year=2020|doi=10.3847/1538-3881/ababad |last1=Wong |first1=Ian |last2=Shporer |first2=Avi |last3=Daylan |first3=Tansu |last4=Benneke |first4=Björn |last5=Fetherolf |first5=Tara |last6=Kane |first6=Stephen R. |last7=Ricker |first7=George R. |last8=Vanderspek |first8=Roland |last9=Latham |first9=David W. |last10=Winn |first10=Joshua N. |last11=Jenkins |first11=Jon M. |last12=Boyd |first12=Patricia T. |last13=Glidden |first13=Ana |last14=Goeke |first14=Robert F. |last15=Sha |first15=Lizhou |last16=Ting |first16=Eric B. |last17=Yahalomi |first17=Daniel |journal=The Astronomical Journal |volume=160 |issue=4 |page=155 |bibcode=2020AJ....160..155W |s2cid=212717799 |doi-access=free }}</ref> |
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<ref name="Coulombe2023">{{cite journal |last1=Coulombe |first1=Louis-Philippe |last2=Benneke |first2=Björn |display-authors=etal |date=August 2023 |title=A broadband thermal emission spectrum of the ultra-hot Jupiter WASP-18b |journal=[[Nature (journal)|Nature]] |volume=620 |issue=7973 |pages=292–298 |doi=10.1038/s41586-023-06230-1 |pmid=37257843 |pmc=10412449 |arxiv=2301.08192 |bibcode=2023Natur.620..292C}}</ref> |
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}} |
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==External links== |
== External links == |
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{{ |
{{Wikinews|Extrasolar planet may eventually collide into its star}} |
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{{commonscat-inline|WASP-18 b|WASP-18b}} |
{{commonscat-inline|WASP-18 b|WASP-18b}} |
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{{Sky|01|37|25|-|45|40|41}} |
{{Sky|01|37|25|-|45|40|41}}{{Phoenix (constellation)}} |
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[[Category:Exoplanets discovered by WASP]] |
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[[Category:Exoplanets]] |
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[[Category:Exoplanets discovered in 2009]] |
[[Category:Exoplanets discovered in 2009]] |
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[[Category:Giant planets]] |
[[Category:Giant planets]] |
Latest revision as of 21:07, 27 November 2023
Discovery[1] | |
---|---|
Discovered by | Hellier et al. (SuperWASP) |
Discovery date | August 27, 2009 |
Transit (including secondary eclipses) | |
Orbital characteristics[2] | |
0.02024 ± 0.00030 AU (3,028,000 ± 45,000 km) | |
Eccentricity | 0.0051+0.0070 −0.0037 |
0.94145223(24) d 22.59485352 h | |
Inclination | 83.5°+2.0° −1.6° |
−85°+72° −96° | |
Semi-amplitude | 1814+23 −24 m/s |
Star | WASP-18 |
Physical characteristics[2] | |
Mean radius | 1.240±0.079 RJ |
Mass | 10.20±0.35 MJ |
Mean density | 6.6+1.2 −1.1 g/cm3 |
Temperature | 3,029±50 K (2,756 °C; 4,993 °F)[3] 2,781+25 −13 K (2,508 °C; 4,546 °F)[4] |
WASP-18b is an exoplanet that is notable for having an orbital period of less than one day. It has a mass equal to 10 Jupiter masses,[1] just below the boundary line between planets and brown dwarfs (about 13 Jupiter masses). Due to tidal deceleration, it is expected to spiral toward and eventually merge with its host star, WASP-18, in less than a million years.[1] The planet is approximately 3.1 million km (1.9 million mi; 0.021 AU) from its star, which is about 400 light-years (120 parsecs) from Earth. A team led by Coel Hellier, a professor of astrophysics at Keele University in England, discovered the exoplanet in 2009.[1]
Scientists at Keele and at the University of Maryland are working to understand whether the discovery of this planet so shortly before its expected demise (with less than 0.1% of its lifetime remaining) was fortuitous, or whether tidal dissipation by WASP-18 is actually much less efficient than astrophysicists typically assume.[1][5] Observations made over the next decade should yield a measurement of the rate at which WASP-18b's orbit is decaying.[6]
The closest example of a similar situation in the Solar System is Mars' moon Phobos. Phobos orbits Mars at a distance of only about 9,000 km (5,600 mi), 40 times closer than the Moon is to the Earth[7] and is expected to be destroyed in about eleven million years.[8]
The planet's dayside temperature, as measured in 2020, is 3,029 ± 50 K (2,755.8 ± 50.0 °C; 4,992.5 ± 90.0 °F).[3] A 2023 study found an average dayside temperature of 2,781+25
−13 K (2,508 °C; 4,546 °F).[4]
A study in 2012, utilizing the Rossiter–McLaughlin effect, determined that the planetary orbit is well aligned with the equatorial plane of the star, with a misalignment equal to 13±7°.[9]
A 2017 study detected carbon monoxide in the planet's atmosphere, without signs of water vapor.[10][11] However, in 2023, the James Webb Space Telescope detected water vapor in the planet's atmosphere.[4][12]
See also
References
- ^ a b c d e Hellier, Coel; et al. (2009). "An orbital period of 0.94days for the hot-Jupiter planet WASP-18b" (PDF). Nature. 460 (7259): 1098–1100. Bibcode:2009Natur.460.1098H. doi:10.1038/nature08245. hdl:2268/28276. PMID 19713926. S2CID 205217669.
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External links
Media related to WASP-18b at Wikimedia Commons