WASP-45#Planetary system
{{Short description|K-type main sequence star in the constellation of Sculptor}}
{{Starbox begin}}
{{Starbox observe
| epoch = J2000
| constell = Sculptor
| dec = {{DEC|-35|59|53.7466}}
}}
{{Starbox character
| type = main sequence
}}
{{Starbox astrometry
| radial_v = {{val|4.71|0.33}}
| prop_mo_ra = 52.831
| prop_mo_dec = −46.940
| parallax = 4.6520
| p_error = 0.0226
}}
{{Starbox detail
| mass = {{val|0.932|0.045|0.046}}
| radius = {{val|0.891|0.013}}
| luminosity = {{val|0.510|0.013}}
| gravity = {{val|4.508|0.023|0.025}}
| temperature = {{val|5167|29}}
| metal_fe = {{val|0.388|0.090|0.10}}
| rotation =
| rotational_velocity = {{val|2.3|0.7}}
| age_gyr = {{val|5.4|4.7|3.5}}
}}
{{Starbox catalog
| names = {{odlist | 2MASS=J00205699-3559537 | GSC=06996-00583 | TIC=120610833 | TOI=229 | TYC=6996-583-1 | WASP=45}}
}}
{{Starbox reference
| Simbad = WASP-45
}}
{{Starbox end}}
WASP-45 is a K-type main-sequence star about {{convert|701|ly|pc|lk=on|abbr=off}} away. The star's age cannot be well constrained, but it is probably older than the Sun. Yet WASP-45 is enriched in heavy elements compared to the Sun, having 240% of the solar abundance.
WASP-45 has low ultraviolet emission, therefore it is suspected to have a low starspot activity,{{citation|doi=10.1088/0004-637X/766/1/9|title=An Ultraviolet Investigation of Activity on Exoplanet Host Stars|year=2013|last1=Shkolnik|first1=Evgenya L.|s2cid=118415788|journal=The Astrophysical Journal|volume=766|issue=1|page=9|arxiv=1301.6192|bibcode=2013ApJ...766....9S}} although chromospheric activity was reported elsewhere.
There is a companion star at a separation of 4.4 arcseconds, corresponding to 929 AU. The companion is estimated to have a mass of {{solar mass|0.157|link=y}} and a temperature of {{val|fmt=commas|3,154|ul=K}}. Although it shares a similar distance and common proper motion with the primary star, its relative space velocity appears to be high enough that the pair are not gravitationally bound.
Planetary system
In 2011 a transiting hot Jupiter planet, WASP-45b, was detected. The planet equilibrium temperature is {{val|fmt=commas|1170|24|ul=K}}. No Rayleigh scattering was detected in the planetary atmosphere, implying the existence of hazes or a high cloud deck.
{{OrbitboxPlanet begin
}}
{{OrbitboxPlanet
| exoplanet = b
| mass = {{val|1.018|0.046|0.045}}
| radius = {{val|0.978|0.026|0.024}}
| semimajor = {{val|0.04089|0.00065|0.00069}}
| period = {{val|3.1260876|(35)}}
| inclination = {{val|84.686|0.098}}
}}
{{Orbitbox end}}
References
{{Reflist|refs=
{{cite simbad |title=WASP-45 |access-date=10 December 2023}}
{{Cite Gaia DR3|2308834780352875904}}
{{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}}
{{cite journal |last1=Mugrauer |first1=M. |date=December 2019 |title=Search for stellar companions of exoplanet host stars by exploring the second ESA-Gaia data release |journal=Monthly Notices of the Royal Astronomical Society |volume=490 |issue=4 |pages=5088–5102 |doi=10.1093/mnras/stz2673 |bibcode=2019MNRAS.490.5088M|doi-access=free }}
{{Cite constellation|WASP-45}}
}}
{{Sky|00|20|56.9940|-|35|59|53.7474}}
{{Sculptor (constellation)}}
{{DEFAULTSORT:WASP-45}}
Category:Sculptor (constellation)
Category:K-type main-sequence stars
Category:Planetary systems with one confirmed planet