HAT-P-20#Planetary system

{{Starbox begin

| name = HAT-P-20

}}

{{Starbox observe

| epoch = J2000

| constell = Gemini

| ra = {{RA|07|27|39.9489}}

| dec = {{DEC|+24|20|11.516}}

| appmag_v = 11.35

}}

{{Starbox character

| type = main sequence

| class = K3V

}}

{{Starbox astrometry

| radial_v = -18.559

| prop_mo_ra = {{val|−5.104|(18)}}

| prop_mo_dec = {{val|−96.090|(16)}}

| pm_footnote =

| parallax = 14.0065

| p_error = 0.0176

| parallax_footnote =

}}

{{Starbox detail

| mass = 0.798{{±|0.018}}

| radius = 0.744{{±|0.011}}

| gravity = 4.52{{±|0.09}}

| luminosity = 0.19

| temperature = 4595{{±|45}}

| metal = 0.22{{±|0.09}}

| rotation = 14.66{{±|0.03}} d

| rotational_velocity =2.0{{±|0.5}}

| age_myr = 334

}}

{{Starbox catalog

| names = {{odlist|2MASS=J07273995+2420118|Gaia DR2=869913435026514688}}

}}

{{Starbox reference

| Simbad = HAT-P-20

}}

HAT-P-20 is a K-type main-sequence star about 233 light-years away. The star has a strong starspot activity, and its equatorial plane is misaligned by 36{{±|10|12}}° with the planetary orbit. Although star with a giant planet on close orbit is expected to be spun-up by tidal forces, only weak indications of tidal spin-up were detected.

Planetary system

In 2010 a transiting hot super-Jovian planet was detected. Its equilibrium temperature is 996{{±|19}} K.

File:Exoplanet Comparison HAT-P-20 b.png

{{OrbitboxPlanet begin

| table_ref =

}}

{{OrbitboxPlanet

| exoplanet = b

| mass = 7.59{{±|0.12}}

| radius = 0.952{{±|0.017}}

| semimajor = 0.03671{{±|0.00027}}

| period = 2.8753172{{±|0.0000003}}

| eccentricity = 0.0172{{±|0.0016}}

| inclination = 86.3{{±|0.1}}

}}

References

{{Reflist|refs=

[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HAT-P-20 HAT-P-20 -- High proper-motion Star]

{{cite journal |bibcode=2017AJ....153...28S |title=Refined System Parameters and TTV Study of Transiting Exoplanetary System HAT-P-20 |last1=Sun |first1=Leilei |last2=Gu |first2=Shenghong |last3=Wang |first3=Xiaobin |last4=Collier Cameron |first4=Andrew |last5=Cao |first5=Dongtao |last6=Wang |first6=Yibo |last7=Xiang |first7=Yue |last8=Hui |first8=Ho-Keung |last9=Kwok |first9=Chi-Tai |last10=Yeung |first10=Bill |last11=Ng |first11=Eric |last12=Grau Horta |first12=Ferran |journal=The Astronomical Journal |date=2017 |volume=153 |issue=1 |page=28 |doi=10.3847/1538-3881/153/1/28 |doi-access=free }}

{{cite journal |bibcode=2022AJ....164...26H |title=Evidence for the Late Arrival of Hot Jupiters in Systems with High Host-star Obliquities |last1=Hamer |first1=Jacob H. |last2=Schlaufman |first2=Kevin C. |journal=The Astronomical Journal |date=2022 |volume=164 |issue=1 |page=26 |doi=10.3847/1538-3881/ac69ef |doi-access=free |arxiv=2205.00040 }}

{{cite journal |bibcode=2019A&A...630A.135U |title=Beyond the exoplanet mass-radius relation |last1=Ulmer-Moll |first1=S. |last2=Santos |first2=N. C. |last3=Figueira |first3=P. |last4=Brinchmann |first4=J. |last5=Faria |first5=J. P. |journal=Astronomy and Astrophysics |date=2019 |volume=630 |pages=A135 |doi=10.1051/0004-6361/201936049 |arxiv=1909.07392 }}

{{cite journal|arxiv=1502.00576|title=High-energy irradiation and mass loss rates of hot Jupiters in the solar neighborhood|year=2015|doi=10.1051/0004-6361/201425243|last1=Salz|first1=M.|last2=Schneider|first2=P. C.|last3=Czesla|first3=S.|last4=Schmitt|first4=J. H. M. M.|journal=Astronomy & Astrophysics|volume=576|pages=A42|bibcode=2015A&A...576A..42S |s2cid=55139248}}

{{cite journal |bibcode=2012yCat.1322....0Z |title=VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012) |last1=Zacharias |first1=N. |last2=Finch |first2=C. T. |last3=Girard |first3=T. M. |last4=Henden |first4=A. |last5=Bartlett |first5=J. L. |last6=Monet |first6=D. G. |last7=Zacharias |first7=M. I. |journal=Vizier Online Data Catalog |date=2012 }}

{{cite journal|arxiv=1008.3388|title=HAT-P-20b–HAT-P-23b: FOUR MASSIVE TRANSITING EXTRASOLAR PLANETS|year=2010|doi=10.1088/0004-637X/742/2/116|last1=Bakos|first1=G. Á.|last2=Hartman|first2=J.|last3=Torres|first3=G.|last4=Latham|first4=D. W.|last5=Kovács|first5=Géza|last6=Noyes|first6=R. W.|last7=Fischer|first7=D. A.|last8=Johnson|first8=J. A.|last9=Marcy|first9=G. W.|last10=Howard|first10=A. W.|last11=Kipping|first11=D.|last12=Esquerdo|first12=G. A.|last13=Shporer|first13=A.|last14=Béky|first14=B.|last15=Buchhave|first15=L. A.|last16=Perumpilly|first16=G.|last17=Everett|first17=M.|last18=Sasselov|first18=D. D.|last19=Stefanik|first19=R. P.|last20=Lázár|first20=J.|last21=Papp|first21=I.|last22=Sári|first22=P.|journal=The Astrophysical Journal|volume=742|issue=2|page=116|bibcode=2011ApJ...742..116B |s2cid=119182075}}

{{cite journal|arxiv=1702.03136|title=The GAPS Programme with HARPS-N at TNG. XIII. The orbital obliquity of three close-in massive planets hosted by dwarf K-type stars: WASP-43, HAT-P-20 and Qatar-2.|year=2017|doi=10.1051/0004-6361/201629720|last1=Esposito|first1=M.|last2=Covino|first2=E.|last3=Desidera|first3=S.|last4=Mancini|first4=L.|last5=Nascimbeni|first5=V.|last6=Zanmar Sanchez|first6=R.|last7=Biazzo|first7=K.|last8=Lanza|first8=A. F.|last9=Leto|first9=G.|last10=Southworth|first10=J.|last11=Bonomo|first11=A. S.|last12=Suárez Mascareño|first12=A.|last13=Boccato|first13=C.|last14=Cosentino|first14=R.|last15=Claudi|first15=R. U.|last16=Gratton|first16=R.|last17=Maggio|first17=A.|last18=Micela|first18=G.|last19=Molinari|first19=E.|last20=Pagano|first20=I.|last21=Piotto|first21=G.|last22=Poretti|first22=E.|last23=Smareglia|first23=R.|last24=Sozzetti|first24=A.|last25=Affer|first25=L.|last26=Anderson|first26=D. R.|last27=Andreuzzi|first27=G.|last28=Benatti|first28=S.|last29=Bignamini|first29=A.|last30=Borsa|first30=F.|journal=Astronomy & Astrophysics|volume=601|pages=A53|bibcode=2017A&A...601A..53E |s2cid=119341241|display-authors=29}}

}}

Category:Gemini (constellation)

Category:K-type main-sequence stars

Category:Planetary systems with one confirmed planet

Category:Planetary transit variables

J07273995+2420118