WASP-26

{{Short description|Yellow main sequence star in the constellation Cetus}} {{Starbox begin}} {{Starbox observe | epoch = J2000 | constell = Cetus<ref name="Roman1987"/> | ra = {{RA|00|18|24.7008}}<ref name=GaiaDR3/> | dec = {{DEC|-15|16|02.276}}<ref name=GaiaDR3/> | appmag_v = 11.30<ref name=TYC2>{{cite journal|title=The Tycho-2 catalogue of the 2.5 million brightest stars|author=Høg, E.|display-authors=etal|date=2000|journal=Astronomy and Astrophysics|volume=355|pages=L27–L30|bibcode=2000A&A...355L..27H}}</ref> }} {{Starbox character | type = subgiant<ref>{{cite thesis |bibcode=2015PhDT.........5I |date=2015 |title=Analysis of Angular Momentum in Planetary Systems and Host Stars |last1=Irwin |first1=Stacy Ann }}</ref><ref name=GaiaDR3/> | class = G0<ref name=Smalley2010/> | r-i =  | v-r =  | b-v = 0.32{{cn|date=May 2025}} | u-b =  | j-h = 0.246{{cn|date=May 2025}} | j-k = 0.411{{cn|date=May 2025}} | variable =  }} {{Starbox astrometry | radial_v = 9.07{{±|0.41}}<ref name=GaiaDR3/> | total_v =  | prop_mo_ra = +27.416<ref name=GaiaDR3/> | prop_mo_dec = −24.524<ref name=GaiaDR3/> | parallax = 3.9574 | p_error = 0.0247 | parallax_footnote = <ref name=GaiaDR3/> | absmag_v =  | absmag_bol =  }} {{Starbox detail | source = <ref name=Southworth2014/> | mass = {{val|1.095|0.043}} | radius = {{val|1.284|0.035}} | luminosity = 1.84<ref name=GaiaDR3/> | gravity = {{val|4.260|0.022}} | temperature = {{val|6015|55}} | metal_fe = {{val|-0.02|0.09}} | rotation =  | rotational_velocity = 3.9{{±|0.4}}<ref name=Anderson2011/> | age_gyr = {{val|4.0|5.9|4.0}} }} {{Starbox catalog | names = {{odlist | 2MASS=J00182469-1516022 | DENIS=J001824.6-151601 | TIC=32487566 | TOI=2386 | TYC=5839-876-1 | WASP=26}}<ref name=Simbad/> }} {{Starbox reference | Simbad = WASP-26 | NSTED = WASP-26 }} {{Starbox end}}

'''WASP-26''' is a G-type subgiant star about 824 light-years away in the constellation of Cetus.

== Star characteristics == WASP-26 is an old star close to leaving the main sequence and is part of a wide binary. The binary's projected separation is 3800 astronomical units, its companion star being a K-type star with an effective temperature of 4600K and a visual magnitude of 13.6.<ref name=Smalley2010/> WASP-26 produces a large amount of ultraviolet light due to frequent flares, with an average ultraviolet flux close to the F7 class main-sequence star WASP-1.<ref>{{cite journal |bibcode=2013ApJ...766....9S |title=An Ultraviolet Investigation of Activity on Exoplanet Host Stars |last1=Shkolnik |first1=Evgenya L. |journal=The Astrophysical Journal |date=2013 |volume=766 |issue=1 |page=9 |doi=10.1088/0004-637X/766/1/9 |arxiv=1301.6192 }}</ref>

== Planetary system == The hot Jupiter class planet WASP-26b was discovered around WASP-26 in 2010.<ref name=Smalley2010/> The planet would have an equilibrium temperature of 1660{{±|40}} K, but measured temperatures are slightly higher at 1775K and no noticeable difference exists between the day-side and the night-side of the planet.<ref>{{cite journal|arxiv=1303.4596|doi=10.1093/mnras/stt505|title=Warm Spitzer occultation photometry of WASP-26b at 3.6 and 4.5 μm|year=2013|last1=Mahtani|first1=D. P.|last2=Maxted|first2=P. F. L.|last3=Anderson|first3=D. R.|last4=Smith|first4=A. M. S.|last5=Smalley|first5=B.|last6=Tregloan-Reed|first6=J.|last7=Southworth|first7=J.|last8=Madhusudhan|first8=N.|last9=Collier Cameron|first9=A.|last10=Gillon|first10=M.|last11=Harrington|first11=J.|last12=Hellier|first12=C.|last13=Pollacco|first13=D.|last14=Queloz|first14=D.|last15=Triaud|first15=A. H. M. J.|last16=West|first16=R. G.|journal=Monthly Notices of the Royal Astronomical Society|volume=432|issue=1|pages=693–701|doi-access=free |bibcode=2013MNRAS.432..693M|s2cid=55842630}}</ref> A 2011 study using the Rossiter-McLaughlin effect failed to determine the inclination of the planetary orbit to the equatorial plane of the parent star due to high stellar noise,<ref name=Anderson2011/> but an initial constraint of -34{{±|36|26}}° was published in 2012.<ref>{{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>

{{OrbitboxPlanet begin | name = WASP-26 | table_ref = <ref name="Bonomo2017"/> }} {{OrbitboxPlanet | exoplanet = b | mass = {{val|1.038|0.020|0.021}} | period = {{val|2.7565972|(19)}} | semimajor = {{val|0.03997|0.00035|0.00036}} | radius = {{val|1.216|0.047}}<ref name=Southworth2014/> | eccentricity = <0.0039 | inclination = {{val|82.83|0.27}}<ref name=Southworth2014/> }} {{Orbitbox end}}

== References == {{Reflist|refs=

<ref name=Simbad>{{cite simbad|title=WASP-26|accessdate=2022-02-19}}</ref>

<ref name="Roman1987">{{Cite constellation|WASP-26}}</ref>

<ref name=Smalley2010>{{cite journal|arxiv=1004.1542|doi=10.1051/0004-6361/201014705|title=WASP-26b: A 1-Jupiter-mass planet around an early-G-type star|year=2010|last1=Smalley|first1=B.|last2=Anderson|first2=D. R.|last3=Collier Cameron|first3=A.|last4=Gillon|first4=M.|last5=Hellier|first5=C.|last6=Lister|first6=T. A.|last7=Maxted|first7=P. F. L.|last8=Queloz|first8=D.|last9=Triaud|first9=A. H. M. J.|last10=West|first10=R. G.|last11=Bentley|first11=S. J.|last12=Enoch|first12=B.|last13=Pepe|first13=F.|last14=Pollacco|first14=D. L.|last15=Segransan|first15=D.|last16=Smith|first16=A. M. S.|last17=Southworth|first17=J.|last18=Udry|first18=S.|last19=Wheatley|first19=P. J.|last20=Wood|first20=P. L.|last21=Bento|first21=J.|journal=Astronomy and Astrophysics|volume=520|pages=A56|bibcode=2010A&A...520A..56S|s2cid=55114421}}</ref>

<ref name=Anderson2011>{{cite journal|arxiv=1106.6092|doi=10.1051/0004-6361/201117597|title=Spin-orbit measurements and refined parameters for the exoplanet systems WASP-22 and WASP-26|year=2011|last1=Anderson|first1=D. R.|last2=Collier Cameron|first2=A.|last3=Gillon|first3=M.|last4=Hellier|first4=C.|last5=Jehin|first5=E.|last6=Lendl|first6=M.|last7=Queloz|first7=D.|last8=Smalley|first8=B.|last9=Triaud|first9=A. H. M. J.|last10=Vanhuysse|first10=M.|journal=Astronomy & Astrophysics|volume=534|pages=A16|bibcode=2011A&A...534A..16A|s2cid=31204371}}</ref>

<ref name=Southworth2014>{{cite journal|arxiv=1407.6253|doi=10.1093/mnras/stu1492|title=High-precision photometry by telescope defocussing – VI. WASP-24, WASP-25 and WASP-26★|year=2014|last1=Southworth|first1=John|last2=Hinse|first2=T. C.|last3=Burgdorf|first3=M.|last4=Calchi Novati|first4=S.|last5=Dominik|first5=M.|last6=Galianni|first6=P.|last7=Gerner|first7=T.|last8=Giannini|first8=E.|last9=Gu|first9=S.-H.|last10=Hundertmark|first10=M.|last11=Jørgensen|first11=U. G.|last12=Juncher|first12=D.|last13=Kerins|first13=E.|last14=Mancini|first14=L.|last15=Rabus|first15=M.|last16=Ricci|first16=D.|last17=Schäfer|first17=S.|last18=Skottfelt|first18=J.|last19=Tregloan-Reed|first19=J.|last20=Wang|first20=X.-B.|last21=Wertz|first21=O.|last22=Alsubai|first22=K. A.|last23=Andersen|first23=J. M.|last24=Bozza|first24=V.|last25=Bramich|first25=D. M.|last26=Browne|first26=P.|last27=Ciceri|first27=S.|last28=d'Ago|first28=G.|last29=Damerdji|first29=Y.|last30=Diehl|first30=C.|journal=Monthly Notices of the Royal Astronomical Society|volume=444|issue=1|pages=776–789|doi-access=free |bibcode=2014MNRAS.444..776S|s2cid=53641330|display-authors=29}}</ref>

<ref name="Bonomo2017">{{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}}</ref>

}}

Category:Planetary systems with one confirmed planet Category:Cetus Category:G-type subgiants Category:Binary stars Category:Planetary transit variables 26 2386

WASP-26

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