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HD 93963

HD 93963
Observation data
Epoch J2000      Equinox ICRS
Constellation Leo Minor[1]
A
Right ascension 10h 51m 06.5137s[2]
Declination +25° 38′ 28.189″[2]
Apparent magnitude (V) +9.18±0.02[3]
B
Right ascension 10h 51m 06.8665s[4]
Declination +25° 38′ 24.800″[4]
Characteristics
A
Evolutionary stage main sequence[5]
Spectral type G0V[6]
B
Evolutionary stage main sequence[6]
Spectral type M5 V[6]
Apparent magnitude (G) 16.9[4]
Astrometry
A
Radial velocity (Rv)+13.37±0.16[2] km/s
Proper motion (μ) RA: −92.833 mas/yr[2]
Dec.: −22.911 mas/yr[2]
Parallax (π)12.1506±0.0171 mas[2]
Distance268.4 ± 0.4 ly
(82.3 ± 0.1 pc)
B
Proper motion (μ) RA: −90.705 mas/yr[4]
Dec.: −22.993 mas/yr[4]
Parallax (π)11.9396±0.1276 mas[4]
Distance273 ± 3 ly
(83.8 ± 0.9 pc)
Details[6]
A
Mass1.109±0.043 M☉
Radius1.043±0.009 R☉
Luminosity1.254±0.058 L☉
Surface gravity (log g)4.49±0.11 cgs
Temperature5,987±64 K
Metallicity [Fe/H]+0.10±0.04 dex
Rotation12.8±1.8 days
Rotational velocity (v sin i)5.9±0.8 km/s
Age1.4+0.8
−0.4 Gyr
B
Mass0.162 M☉
Radius0.196 R☉
Temperature3,090 K
Other designations
HD 93963, WDS J10511+2538, TOI-1797[7]
Database references
SIMBADHD 93963 A
HD 93963 B

HD 93963 is a binary star in the constellation Leo Minor. At an apparent magnitude of +9.18, it is not visible to the naked eye. Parallax measurements give a distance of 268 light-years (82.3 parsecs) and 273 light-years (83.8 parsecs) for the primary and secondary component, respectively. Interstellar extinction causes the system's magnitude to be reduced by 0.10±0.05 magnitudes.[6]

Characteristics

The primary, HD 93963 A, is main sequence star[6] of class G0V.[6] The star has a mass 1.11 times that of the Sun and a radius 1.043 times solar. It irradiates 25% more luminosity than the Sun and has an effective temperature of 5,987 K,[6] giving it a yellowish-white hue as typical of G-type stars.[8]

The companion, HD 93963 B, is a red dwarf star of class M5V. The star has 0.16 times the mass and 0.20 times the radius of the Sun, with a cool effective temperature of 3,060 K. It has a projected separation of 484 au from the primary.[6]

Planetary system

Two planets have been discovered around the primary star in 2022 with the joint use of transit photometry and radial velocity.[6]

  • HD 93963 A b is a super-Earth with an orbital period of 1.04 days. It orbits at a semi-major axis of 0.0209 AU and shows an inclination of 86.21 degrees. The planet has a radius of 1.35±0.042 Earth radii. Its mass estimate sits at 7.8±3.2 Earth masses.[6]
  • HD 93963 A c is a sub-Neptune planet that completes an orbit every 3.65 days. Its radius measures 3.228±0.059 Earth radii and its mass measures 19.2±4.1 Earth masses.[6]

References

  1. ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  2. ^ 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.
  3. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  4. ^ 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.
  5. ^ MacDougall, Mason G.; Petigura, Erik A.; Gilbert, Gregory J.; Angelo, Isabel; Batalha, Natalie M.; Beard, Corey; Behmard, Aida; Blunt, Sarah; Brinkman, Casey; Chontos, Ashley; Crossfield, Ian J. M.; Dai, Fei; Dalba, Paul A.; Dressing, Courtney; Fetherolf, Tara (2023-06-27). "The TESS-Keck Survey. XV. Precise Properties of 108 TESS Planets and Their Host Stars". The Astronomical Journal. 166 (1): 33. doi:10.3847/1538-3881/acd557. ISSN 0004-6256.
  6. ^ a b c d e f g h i j k l Serrano, L. M.; Gandolfi, D.; Hoyer, S.; Brandeker, A.; Hooton, M. J.; Sousa, S.; Murgas, F.; Ciardi, D. R.; Howell, S. B.; Benz, W.; Billot, N.; Florén, H.-G.; Bekkelien, A.; Bonfanti, A.; Krenn, A. (2022-11-01). "The HD 93963 A transiting system: A 1.04 d super-Earth and a 3.65 d sub-Neptune discovered by TESS and CHEOPS". Astronomy & Astrophysics. 667: A1. arXiv:2207.13920. doi:10.1051/0004-6361/202243093. ISSN 0004-6361.
  7. ^ "HD 93963". SIMBAD. Centre de données astronomiques de Strasbourg.
  8. ^ "The Colour of Stars". Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. Archived from the original on 2013-12-03. Retrieved 2012-01-16.

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