WASP-12

{{Starbox begin

| name = WASP-12

}}

{{Starbox observe

| epoch = J2000.0

| constell = Auriga

| ra = {{RA|06|30|32.7966}}

| dec = {{DEC|+29|40|20.264}}

| appmag_v = {{val|11.560|0.068}}

}}

{{Starbox character

| class = G0V or F{{cn|date=December 2020}}

| appmag_1_passband = B

| appmag_1 = {{val|12.138|0.019}}

| appmag_2_passband = R

| appmag_2 = ~11.6

| appmag_3_passband = J

| appmag_3 = {{val|10.477|0.021}}

| appmag_4_passband = H

| appmag_4 = {{val|10.228|0.022}}

| appmag_5_passband = K

| appmag_5 = {{val|10.188|0.020}}

| variable =

}}

{{Starbox astrometry

| radial_v =

| prop_mo_ra = {{val|−1.519|(19)}}

| prop_mo_dec = {{val|−6.761|(15)}}

| pm_footnote =

| parallax = 2.4213

| p_error = 0.0166

| parallax_footnote =

| absmag_v =

}}

{{Starbox detail

| age =

| mass = {{Val|1.434|0.11|0.09}}

| radius = {{Val|1.657|0.046|0.044}}

| rotation =

| luminosity = {{Val|4.05|0.54|0.53}}

| temperature = {{val|6360|130|140}}

| metal = {{val|+0.33|0.14|0.17}}

}}

{{Starbox catalog

| names = TYC 1891-1178-1, 2MASS J06303279+2940202, UCAC2 42216354, Gaia DR2 3435282862461427072

}}

{{Starbox reference

| Simbad = WASP-12

| EPE = WASP-12

}}

WASP-12 is a magnitude 11 yellow dwarf star located approximately 1347 light-years away in the constellation Auriga.{{cite web

| url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=WASP-12

| title =SIMBAD query result: WASP-12 -- Star

| publisher=Centre de Données astronomiques de Strasbourg

| access-date=2009-04-24 }} WASP-12 has a mass and radius similar to the Sun and is known for being orbited by a planet that is extremely hot and has a retrograde orbit around WASP-12. WASP-12 forms a triple star system with two red dwarf companions. Both of them have spectral types of M3V and are only 38% and 37% as massive as the Sun, respectively.{{cite journal|bibcode=2014ApJ...788....2B|doi=10.1088/0004-637X/788/1/2|arxiv=1307.6857|title=WASP-12b AND HAT-P-8b ARE MEMBERS OF TRIPLE STAR SYSTEMS|journal=The Astrophysical Journal|volume=788|issue=1|pages=2|year=2014|last1=Bechter|first1=Eric B.|last2=Crepp|first2=Justin R.|last3=Ngo|first3=Henry|last4=Knutson|first4=Heather A.|last5=Batygin|first5=Konstantin|last6=Hinkley|first6=Sasha|last7=Muirhead|first7=Philip S.|last8=Johnson|first8=John Asher|last9=Howard|first9=Andrew W.|last10=Montet|first10=Benjamin T.|last11=Matthews|first11=Christopher T.|last12=Morton|first12=Timothy D.|s2cid=36306243}}

Planetary system

In 2008, the extrasolar planet WASP-12b was discovered orbiting WASP-12 by the transit method. Its high carbon-to-oxygen ratio indicates that rocky planets might have formed in the star system, and it may be a carbon planet.{{Cite journal |first1=Nikku |last1=Madhusudhan |last2=Harrington |date=December 8, 2010 |first2=Joseph |pages=64–7 |last3=Stevenson |first3=Kevin B. |last4=Nymeyer |first4=Sarah |last5=Campo |first5=Christopher J. |last6=Wheatley |first6=Peter J. |last7=Deming |first7=Drake |last8=Blecic |first8=Jasmina |last9=Hardy |first9=Ryan A. |last10=Lust |first10=Nate B. |last11=Anderson |first11=David R. |last12=Collier-Cameron |first12=Andrew |last13=Britt |first13=Christopher B. T. |last14=Bowman |first14=William C. |last15=Hebb |first15=Leslie |last16=Hellier |first16=Coel |last17=Maxted |first17=Pierre F. L. |last18=Pollacco |first18=Don |last19=West |first19=Richard G. |title=A high C/O ratio and weak thermal inversion in the atmosphere of exoplanet WASP-12b |volume=469 |journal=Nature |doi=10.1038/nature09602 |arxiv=1012.1603 |bibcode = 2011Natur.469...64M |issue=7328 |pmid=21150901|s2cid=4415171 |display-authors=8 }}. 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]

In 2015, no indications of additional planets were found in the WASP-12 system.{{cite journal|arxiv=1512.00464|last1=Collins|first1=Karen A.|last2=Kielkopf|first2=John F.|last3=Stassun|first3=Keivan G.|title=TRANSIT TIMING VARIATION MEASUREMENTS OF WASP-12b AND QATAR-1b: NO EVIDENCE OF ADDITIONAL PLANETS|journal=The Astronomical Journal|year=2015|volume=153|issue=2|page=78|doi=10.3847/1538-3881/153/2/78|s2cid=55191644 |doi-access=free }}

File:WASP-12b a Hot, Carbon-Rich Planet.jpg

File:WASP-12b.jpg

File:WASP-12b (NASA).jpg|Artist's conception of WASP-12 & WASP-12b

{{OrbitboxPlanet

| exoplanet = b

| mass = {{val|1.41|0.1}}

| period = {{val|1.091423|0.000003}}

| semimajor = {{val|0.0229|0.0008}}

| eccentricity = {{val|0.049|0.015}}

| inclination = {{val|86.0|3.0}}{{cite encyclopedia |author=Staff |title=Planet WASP-12 b |url=https://exoplanet.eu/catalog/wasp_12_b--459/ |date=2015 |encyclopedia=Extrasolar Planets Encyclopaedia |access-date=4 August 2017 }}

| radius = {{val|1.736|0.092}}

}}

References

{{reflist|refs=

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{{cite journal |doi=10.1086/498708 |last1=Skrutskie |first1=Michael F. |last2=Cutri |first2=Roc M. |last3=Stiening |first3=Rae |last4=Weinberg |first4=Martin D. |last5=Schneider |first5=Stephen E. |last6=Carpenter |first6=John M. |last7=Beichman |first7=Charles A. |last8=Capps |first8=Richard W. |last9=Chester |first9=Thomas |last10=Elias |first10=Jonathan H. |last11=Huchra |first11=John P. |last12=Liebert |first12=James W. |last13=Lonsdale |first13=Carol J. |last14=Monet |first14=David G. |last15=Price |first15=Stephan |last16=Seitzer |first16=Patrick |last17=Jarrett |first17=Thomas H. |last18=Kirkpatrick |first18=J. Davy |last19=Gizis |first19=John E. |last20=Howard |first20=Elizabeth V. |last21=Evans |first21=Tracey E. |last22=Fowler |first22=John W. |last23=Fullmer |first23=Linda |last24=Hurt |first24=Robert L. |last25=Light |first25=Robert M. |last26=Kopan |first26=Eugene L. |last27=Marsh |first27=Kenneth A. |last28=McCallon |first28=Howard L. |last29=Tam |first29=Robert |last30=Van Dyk |first30=Schuyler D. |last31=Wheelock |first31=Sherry L. |title=The Two Micron All Sky Survey (2MASS) |journal=The Astronomical Journal |date=1 February 2006 |volume=131 |issue=2 |pages=1163–1183 |bibcode=2006AJ....131.1163S |s2cid=18913331 |issn=0004-6256 |doi-access=free }} [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=II/246/out&2MASS===06535708%2b3830178 Vizier catalog entry ]

}}