LTT 9779 is a G-type main-sequence star located 264 light-years (81 parsecs) away from the Solar System in the constellation of Sculptor. The star is about 95% the radius and about the same mass as the Sun, but younger than the Sun at 1.7 billion years old, hence its lower luminosity (about 0.7 L☉). It has a temperature of 5,443 K (5,170 °C; 9,338 °F) and a rotation period of 45 days.[3] LTT 9779 is orbited by one known exoplanet.
In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project.[5] The approved names, proposed by a team from Colombia, were announced in June 2023. LTT 9779 is named Uúba and its planet is named Cuancoá, after the U'wa language word referring to "stars", "seeds", or "eyes" and the name for the morning star, respectively.[6]
Planetary systemedit
The discovery of the exoplanet LTT 9779 b using TESS was published in 2020. It is an ultra-hot Neptune with about 29 times the mass and 4.7 times the radius of Earth and an orbital period of less than a day. These parameters make it one of the very few known planets in the Neptunian desert.[3] Observations using the Spitzer Space Telescope have measured the planet's dayside temperature at 2,305 K (2,032 °C; 3,689 °F),[7][8] and observations by CHEOPS have shown the planet to be highly reflective, with an albedo of 80%.[9][10]
A study published in 2019, prior to the confirmation of LTT 9779 b, proposed a second candidate planet in the system based on transit timing variations, but this has not been confirmed,[11] and the study that confirmed LTT 9779 b found no evidence of transit timing variations.[3]: 23
^"Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008. Retrieved 30 August 2022.
^ abcdefVallenari, 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.
^ abcdefghijklmJenkins, James S.; Díaz, Matías R.; et al. (September 2020). "An Ultra-Hot Neptune in the Neptune desert". Nature Astronomy. 4 (12): 1148–1157. arXiv:2009.12832. Bibcode:2020NatAs...4.1148J. doi:10.1038/s41550-020-1142-z. S2CID 256707813.
^"List of ExoWorlds 2022". nameexoworlds.iau.org. IAU. 8 August 2022. Retrieved 27 August 2022.
^"2022 Approved Names". nameexoworlds.iau.org. IAU. Retrieved 7 June 2023.
^ abDragomir, Diana; Crossfield, Ian J. M.; et al. (November 2020). "Spitzer Reveals Evidence of Molecular Absorption in the Atmosphere of the Hot Neptune LTT 9779b". The Astrophysical Journal Letters. 903 (1): L6. arXiv:2010.12744. Bibcode:2020ApJ...903L...6D. doi:10.3847/2041-8213/abbc70. S2CID 225067568.
^Crossfield, Ian J. M.; Dragomir, Diana; et al. (November 2020). "Phase Curves of Hot Neptune LTT 9779b Suggest a High-metallicity Atmosphere". The Astrophysical Journal Letters. 903 (1): L7. arXiv:2010.12745. Bibcode:2020ApJ...903L...7C. doi:10.3847/2041-8213/abbc71. S2CID 225067727.
^"Cheops shows scorching exoplanet acts like a mirror". ESA. 10 July 2023. Retrieved 10 July 2023.
^Hoyer, S.; Jenkins, J. S.; et al. (July 2023). "The extremely high albedo of LTT 9779 b revealed by CHEOPS". Astronomy & Astrophysics. 675: A81. doi:10.1051/0004-6361/202346117.
^Pearson, Kyle A. (December 2019). "A Search for Multiplanet Systems with TESS Using a Bayesian N-body Retrieval and Machine Learning". The Astronomical Journal. 158 (6): 243. arXiv:1907.03377. Bibcode:2019AJ....158..243P. doi:10.3847/1538-3881/ab4e1c. S2CID 195833716.
May 02, 2024
9779, type, main, sequence, star, located, light, years, parsecs, away, from, solar, system, constellation, sculptor, star, about, radius, about, same, mass, younger, than, billion, years, hence, lower, luminosity, about, temperature, rotation, period, days, o. LTT 9779 is a G type main sequence star located 264 light years 81 parsecs away from the Solar System in the constellation of Sculptor The star is about 95 the radius and about the same mass as the Sun but younger than the Sun at 1 7 billion years old hence its lower luminosity about 0 7 L It has a temperature of 5 443 K 5 170 C 9 338 F and a rotation period of 45 days 3 LTT 9779 is orbited by one known exoplanet LTT 9779 Uuba Observation dataEpoch J2000 Equinox J2000 Constellation Sculptor 1 Right ascension 23h 54m 40 20731s 2 Declination 37 37 40 5244 2 Apparent magnitude V 9 76 0 03 3 Characteristics Evolutionary stage Main sequence Spectral type G7V 3 Apparent magnitude B 10 55 0 04 3 Apparent magnitude V 9 76 0 03 3 Apparent magnitude G 9 606 0 003 2 Apparent magnitude J 8 45 0 02 3 Apparent magnitude H 8 15 0 02 3 Apparent magnitude K 8 02 0 03 3 AstrometryRadial velocity Rv 10 72 0 22 2 km sProper motion m RA 247 634 mas yr 2 Dec 69 752 mas yr 2 Parallax p 12 3381 0 0166 mas 2 Distance264 3 0 4 ly 81 0 0 1 pc Absolute magnitude MV 5 30 0 07 3 Details 3 Mass1 00 0 02 0 03 M Radius0 949 0 006 R Luminosity bolometric 0 71 0 01 L Surface gravity log g 4 51 0 01 cgsTemperature5443 14 13 KMetallicity Fe H 0 27 0 03 dexRotation 45 dRotational velocity v sin i 1 06 0 37 km sAge1 9 1 7 1 2 Gyr Other designationsUuba CD 38 15670 CPD 38 8578 HIP 117883 SAO 214854 PPM 304331 LTT 9779 NLTT 58368 TOI 193 TIC 183985250 TYC 8015 1162 1 2MASS J23544020 3737408 WISEA J235440 43 373741 2 4 Database referencesSIMBADdataNomenclature editThe designation LTT 9779 comes from one of Luyten s catalogues of stars with high proper motion In August 2022 this planetary system was included among 20 systems to be named by the third NameExoWorlds project 5 The approved names proposed by a team from Colombia were announced in June 2023 LTT 9779 is named Uuba and its planet is named Cuancoa after the U wa language word referring to stars seeds or eyes and the name for the morning star respectively 6 Planetary system editThe discovery of the exoplanet LTT 9779 b using TESS was published in 2020 It is an ultra hot Neptune with about 29 times the mass and 4 7 times the radius of Earth and an orbital period of less than a day These parameters make it one of the very few known planets in the Neptunian desert 3 Observations using the Spitzer Space Telescope have measured the planet s dayside temperature at 2 305 K 2 032 C 3 689 F 7 8 and observations by CHEOPS have shown the planet to be highly reflective with an albedo of 80 9 10 A study published in 2019 prior to the confirmation of LTT 9779 b proposed a second candidate planet in the system based on transit timing variations but this has not been confirmed 11 and the study that confirmed LTT 9779 b found no evidence of transit timing variations 3 23 The LTT 9779 planetary system 3 7 Companion in order from star Mass Semimajor axis AU Orbital period days Eccentricity Inclination Radius b Cuancoa 29 32 0 78 0 81 M 0 01679 0 00014 0 00012 0 7920520 0 0000093 lt 0 01 76 39 0 43 4 72 0 23 R References edit Finding the constellation which contains given sky coordinates djm cc 2 August 2008 Retrieved 30 August 2022 a b c d e f 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 amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR a b c d e f g h i j k l m Jenkins James S Diaz Matias R et al September 2020 An Ultra Hot Neptune in the Neptune desert Nature Astronomy 4 12 1148 1157 arXiv 2009 12832 Bibcode 2020NatAs 4 1148J doi 10 1038 s41550 020 1142 z S2CID 256707813 LTT 9779 SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 30 August 2022 List of ExoWorlds 2022 nameexoworlds iau org IAU 8 August 2022 Retrieved 27 August 2022 2022 Approved Names nameexoworlds iau org IAU Retrieved 7 June 2023 a b Dragomir Diana Crossfield Ian J M et al November 2020 Spitzer Reveals Evidence of Molecular Absorption in the Atmosphere of the Hot Neptune LTT 9779b The Astrophysical Journal Letters 903 1 L6 arXiv 2010 12744 Bibcode 2020ApJ 903L 6D doi 10 3847 2041 8213 abbc70 S2CID 225067568 Crossfield Ian J M Dragomir Diana et al November 2020 Phase Curves of Hot Neptune LTT 9779b Suggest a High metallicity Atmosphere The Astrophysical Journal Letters 903 1 L7 arXiv 2010 12745 Bibcode 2020ApJ 903L 7C doi 10 3847 2041 8213 abbc71 S2CID 225067727 Cheops shows scorching exoplanet acts like a mirror ESA 10 July 2023 Retrieved 10 July 2023 Hoyer S Jenkins J S et al July 2023 The extremely high albedo of LTT 9779 b revealed by CHEOPS Astronomy amp Astrophysics 675 A81 doi 10 1051 0004 6361 202346117 Pearson Kyle A December 2019 A Search for Multiplanet Systems with TESS Using a Bayesian N body Retrieval and Machine Learning The Astronomical Journal 158 6 243 arXiv 1907 03377 Bibcode 2019AJ 158 243P doi 10 3847 1538 3881 ab4e1c S2CID 195833716 Retrieved from https en wikipedia org w index php title LTT 9779 amp oldid 1188065174, wikipedia, wiki, book, books, library,
