HD 24040

HD 24040 is a metal-rich G-type star located approximately 152 light-years away in the constellation of Taurus. In 2006 a long-period planet was discovered.[3]

HD 24040
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Right ascension  03h 50m 22.9678s[1]
Declination +17° 28′ 34.9254″[1]
Apparent magnitude (V) 7.52
Characteristics
Spectral type G0
Astrometry
Proper motion (μ) RA: 113.215±0.113[1] mas/yr
Dec.: −251.033±0.062[1] mas/yr
Parallax (π)21.4203 ± 0.0620[1] mas
Distance152.3 ± 0.4 ly
(46.7 ± 0.1 pc)
Details
Mass1.14 ± 0.02[2] M☉
Radius1.28 ± 0.03[2] R☉
Luminosity1.81 ± 0.01[2] L☉
Surface gravity (log g)4.27 ± 0.02[2] cgs
Temperature5917 ± 52[2] K
Age4.8 ± 0.8[2] Gyr
Other designations
BD+17°638, HIP 17960, LTT 11274, NLTT 11955, SAO 93630
Database references
SIMBADdata

Planetary system

A long period planet was discovered in 2006 based on observations made at the W. M. Keck Observatory in Hawaii. However because the observations covered less than one complete orbit there were only weak constraints on the period and mass.[3] The first reliable orbit for HD 24040b was obtained by astronomers at Haute-Provence Observatory in 2012 who combined the keck measurements with ones from the SOPHIE and ELODIE spectrographs.[4] The most recent orbit published in 2015 added additional keck measurements and refined the orbital parameters.[5]

A linear trend in the radial velocities indicating a possible additional companion was detected at Haute-Provence Observatory and was also detected at keck but at a much smaller amplitude.[4][5]

The HD 24040 planetary system[5]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >4.10±0.12 MJ 4.637±0.067 3490±25 0.047±0.020 — —
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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. Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951.
  3. Wright, J. T.; et al. (2007). "Four New Exoplanets and Hints of Additional Substellar Companions to Exoplanet Host Stars". The Astrophysical Journal. 657 (1): 533–545. arXiv:astro-ph/0611658. Bibcode:2007ApJ...657..533W. doi:10.1086/510553.
  4. Boisse, I.; et al. (2012). "The SOPHIE search for northern extrasolar planets. V. Follow-up of ELODIE candidates: Jupiter-analogs around Sun-like stars". Astronomy and Astrophysics. 545. A55. arXiv:1205.5835. Bibcode:2012A&A...545A..55B. doi:10.1051/0004-6361/201118419.
  5. Feng, Y. Katherina; et al. (2015). "The California Planet Survey IV: A Planet Orbiting the Giant Star HD 145934 and Updates to Seven Systems with Long-period Planets". The Astrophysical Journal. 800 (1). 22. arXiv:1501.00633. Bibcode:2015ApJ...800...22F. doi:10.1088/0004-637X/800/1/22.

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