HD 109749

HD 109749 is a binary star about 206 light years away in the constellation of Centaurus.

HD 109749
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension  12h 37m 16.3786s[1]
Declination −40° 48′ 43.6244″[1]
Apparent magnitude (V) 8.1
Characteristics
Spectral type G3IV
Astrometry
Proper motion (μ) RA: −157.374±0.092[1] mas/yr
Dec.: −6.481±0.120[1] mas/yr
Parallax (π)15.8240 ± 0.0736[1] mas
Distance206.1 ± 1.0 ly
(63.2 ± 0.3 pc)
Details
Other designations
CD−40 7393, HIP 61595, SAO 223556[2]
Database references
SIMBADdata

Stellar system

The primary star, HD 109749 A, is a G-type subgiant with a spectral type of G3IV,[3] indicating it is an evolved star with a luminosity higher than that of a main sequence star. It has a mass of 1.14 M☉ and a radius of 1.21 R☉. The star is shining with a luminosity of 1.55 L☉ and has an effective temperature of 5,860 K. Evolutionary models estimate an age of 4.1 billion years.[4] HD 109749 A is chromospherically inactive and has a high metallicity, with an iron abundance 78% larger than the Sun's.[3]

The secondary star, HD 109749 B, is a K-type main sequence star with an apparent magnitude of 10.3.[5] It has a mass of about 0.78 M☉ and is located at a separation of 8.4 arcseconds, which corresponds to a projected separation of 500 AU. This star has the same proper motion as the primary and seems to be at the same distance, confirming they form a physical binary system.[6]

Planetary system

In 2005, an exoplanet was discovered around HD 109749 A. It was detected by the radial velocity method as part of the N2K Consortium. It is a hot Jupiter with a minimum mass of 0.28 MJ and a semimajor axis of 0.06 AU.[3]

The HD 109749 planetary system[7]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥0.27±0.045 MJ 0.0615±0.004 5.239891±0.000099 0 (fixed) — —
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See also

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. "HD 109749". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-12-19.
  3. Fischer, Debra A.; et al. (2006). "The N2K Consortium. III. Short-Period Planets Orbiting HD 149143 and HD 109749". The Astrophysical Journal. 637 (2): 1094–1101. Bibcode:2006ApJ...637.1094F. doi:10.1086/498557.
  4. Bonfanti, A.; Ortolani, S.; Nascimbeni, V. (2016). "Age consistency between exoplanet hosts and field stars". Astronomy and Astrophysics. 585. A5. arXiv:1511.01744. Bibcode:2016A&A...585A...5B. doi:10.1051/0004-6361/201527297.
  5. "HD 109749B -- High proper-motion Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2018-01-20.
  6. Desidera, S.; Barbieri, M. (January 2007). "Properties of planets in binary systems. The role of binary separation". Astronomy and Astrophysics. 462 (1): 345–353. arXiv:astro-ph/0610623. Bibcode:2007A&A...462..345D. doi:10.1051/0004-6361:20066319.
  7. Ment, Kristo; et al. (2018). "Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810". The Astronomical Journal. 156 (5). 213. arXiv:1809.01228. Bibcode:2018AJ....156..213M. doi:10.3847/1538-3881/aae1f5.

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