Star in the constellation Pegasus
HD 220773 is a star in the northern constellation of Pegasus . It has an apparent visual magnitude of 7.10,[ 1] parallax measurements, is 165 light years ,[ 2] radial velocity of −37.7 km/s.[ 5] proper motion , traversing the celestial sphere at an angular rate of −1 [ 10]
The spectrum of HD 220773 presents as a late type star F-type or early G-type main-sequence star with a stellar classification of F9 V[ 4] [ 3] [ 6] magnetic activity in the chromosphere is at a low level.[ 7] [ 6] metallicity , is slightly higher than solar.[ 7] photosphere at an effective temperature of 5,852 K.[ 6]
A survey in 2015 ruled out the existence of any additional stellar companions at projected distances from 31 to 337 astronomical units .[ 3]
Search for planets
The detection of an exoplanet , HD 220773 b, by the radial velocity method was claimed in 2012 based on observations at the McDonald Observatory . As the inclination of the orbital plane is unknown, only a lower bound on the mass can be determined. This object has at least 1.45 times the mass of Jupiter. It has a very eccentric orbit with a semimajor axis of around AU [ 7]
However, a follow-up study in 2024 found no evidence of this planet in radial velocity data from the HARPS-N spectrograph. In addition, astrometric data from the Gaia [ 11]
References
^ a b c d e Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv :1108.4971 Bibcode :2012AstL...38..331A . doi :10.1134/S1063773712050015 . S2CID 119257644 . ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1. arXiv :2208.00211 Bibcode :2023A&A...674A...1G . doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source at VizieR .^ a b c Mugrauer, M.; Ginski, C. (12 May 2015). "High-contrast imaging search for stellar and substellar companions of exoplanet host stars" . Monthly Notices of the Royal Astronomical Society . 450 (3): 3127– 3136. Bibcode :2015MNRAS.450.3127M . doi :10.1093/mnras/stv771 hdl :1887/49340 ^ a b Wittrock, Justin M.; et al. (2017). "Exclusion of Stellar Companions to Exoplanet Host Stars" . The Astronomical Journal . 154 (5): 184. arXiv :1709.05315 Bibcode :2017AJ....154..184W . doi :10.3847/1538-3881/aa8d69 S2CID 55789971 . ^ a b Soubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics . 616 : A7. arXiv :1804.09370 Bibcode :2018A&A...616A...7S . doi :10.1051/0004-6361/201832795 . S2CID 52952408 . ^ a b c d e f g h i Bonfanti, A.; et al. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy & Astrophysics . 585 : 14. arXiv :1511.01744 Bibcode :2016A&A...585A...5B . doi :10.1051/0004-6361/201527297 . S2CID 53971692 . A5. ^ a b c d Robertson, Paul; et al. (2012). "The McDonald Observatory Planet Search: New Long-period Giant Planets and Two Interacting Jupiters in the HD 155358 System". The Astrophysical Journal . 749 (1): 39. arXiv :1202.0265 Bibcode :2012ApJ...749...39R . doi :10.1088/0004-637X/749/1/39 . S2CID 59273311 . ^ Tejada Arevalo, Roberto A.; et al. (October 2021). "Further Evidence for Tidal Spin-up of Hot Jupiter Host Stars" . The Astrophysical Journal . 919 (2): 138. arXiv :2107.05759 Bibcode :2021ApJ...919..138T . doi :10.3847/1538-4357/ac1429 ^ "HD 220773" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 18 September 2020 .^ Luyten, W. J. (June 1995). "NLTT Catalogue (Luyten, 1979)". VizieR Online Data Catalog . Bibcode :1995yCat.1098....0L . ^ Carleo, Ilaria; Desidera, Silvano; et al. (June 2024). "Disproving the High-eccentricity Planet HD 220773b" . Research Notes of the AAS 8 (6): 161. doi :10.3847/2515-5172/ad57b5
