HD 42936

Last updated
HD 42936
HD42936 location.png
Location of HD 42936 in the night sky. The star is marked within the red diamond.
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Mensa
Right ascension 06h 06m 29.8472s [1]
Declination −72° 30′ 45.5674″ [1]
Apparent magnitude  (V)9.10 [2]
Characteristics
HD 42936A
Evolutionary stage main sequence star
Spectral type K0 IV/V [3]
B−V color index +0.91 [4]
HD 42936B
Evolutionary stage main sequence star
Spectral type L [5]
Astrometry
Radial velocity (Rv)34.4 ± 2.6 [6]  km/s
Proper motion (μ)RA: −0.716 [1]   mas/yr
Dec.: −382.755 [1]   mas/yr
Parallax (π)21.2496 ± 0.1143  mas [1]
Distance 153.5 ± 0.8  ly
(47.1 ± 0.3  pc)
Absolute magnitude  (MV)5.78 [2]
Details [7]
HD 42936A
Mass 0.87 ± 0.05  M☉
Radius 0.91 ± 0.02  R☉
Luminosity 0.510 ± 0.003 [8]   L☉
Surface gravity (log g)4.44 [9]   cgs
Temperature 5,138 ± 99  K
Metallicity [Fe/H]0.18 ± 0.09 [10]   dex
Rotation 21.8+0.5
−16.5  d
Rotational velocity (v sin i)1.97 ± 0.14 km/s
Age 10.9  Gyr
HD 42936B
Mass 79.9[ citation needed ]  MJup
Age 10.9  Gyr
Other designations
DMPP-3, CD−72°312, CPD−72°451, GC  7845, HD  42936, HIP  28941, SAO  256269 [11]
Database references
SIMBAD data
Exoplanet Archive data
Extrasolar Planets
Encyclopaedia 		data

HD 42936 (DMPP-3) is a star located in the southern circumpolar constellation Mensa. With an apparent magnitude of 9.1, [2] it is too faint to be detected with the naked eye but can be seen with a telescope. The star is relatively close at a distance of about 153 light years [1] but is receding with a heliocentric radial velocity of 34.4  km/s . [6]

Contents

HD 42936 is an early K-type star with the blended luminosity class of a main sequence star and a subgiant. [3] At present it has 87% the mass of the Sun and 91% the radius of the Sun. [7] The object shines at 51% the luminosity of the Sun [8] from its photosphere at an effective temperature of 5,138 K, [7] which gives it an orangish yellow glow. HD 42936 has iron abundance 151% that of the Sun, meaning it is metal enriched [10] despite an age of 10.9 billion years. [7]

Planetary system

In 2019, an analysis carried out by a team of astronomers led by astronomer John R. Barnes of the Dispersed Matter Planet Project (DMPP) confirmed the existence of a super-Earth [7] in orbit around DMPP-3

The HD 42936 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
Ab≥ 2.58 +0.35
−0.58  M🜨 		0.0662 +0.02
−0.02		6.6732 +0.0011
−0.0003		0.14——

See also

Related Research Articles

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<span class="mw-page-title-main">HD 40307</span> Star in the constellation Pictor

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References

  1. 1 2 3 4 5 6 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics . 649: A1. arXiv: 2012.01533 . Bibcode:2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657 . S2CID   227254300. (Erratum:  doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. 1 2 3 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN   1063-7737. S2CID   255204555.
  3. 1 2 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.
  4. ↑ Cousins, A. W. J.; Stoy, R. H. (1962). "Photoelectric magnitudes and colours of Southern stars". Royal Greenwich Observatory Bulletins. 64: 103. Bibcode:1962RGOB...64..103C.
  5. ↑ Haswell, Carole A.; Staab, Daniel; Barnes, John R.; Anglada-Escudé, Guillem; Fossati, Luca; Jenkins, James S.; Norton, Andrew J.; Doherty, James P. J.; Cooper, Joseph (2019). "Dispersed Matter Planet Project discoveries of ablating planets orbiting nearby bright stars". Nature Astronomy. 4 (4): 408–418. arXiv: 1912.10874 . doi:10.1038/s41550-019-0973-y. S2CID   209444484.
  6. 1 2 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN   1063-7737. S2CID   119231169.
  7. 1 2 3 4 5 Barnes, John R.; Haswell, Carole A.; Staab, Daniel; Anglada-Escudé, Guillem; Fossati, Luca; Doherty, James P. J.; Cooper, Joseph; Jenkins, James S.; Díaz, Matías R.; Soto, Maritza G.; Peña Rojas, Pablo A. (2019). "An ablating 2.6-M🜨 planet in an eccentric binary from the Dispersed Matter Planet Project". Nature Astronomy. 4 (4): 419–426. arXiv: 1912.10793 . doi:10.1038/s41550-019-0972-z. S2CID   209444780.
  8. 1 2 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.
  9. ↑ Pavlenko, Y. V.; Kaminsky, B. M.; Jenkins, J. S.; Ivanyuk, O. M.; Jones, H. R. A.; Lyubchik, Y. P. (January 2019). "Masses, oxygen, and carbon abundances in CHEPS dwarf stars". Astronomy & Astrophysics. 621: A112. arXiv: 1811.05011 . Bibcode:2019A&A...621A.112P. doi: 10.1051/0004-6361/201834138 . ISSN   0004-6361.
  10. 1 2 Jenkins, J. S.; Jones, H. R. A.; Pavlenko, Y.; Pinfield, D. J.; Barnes, J. R.; Lyubchik, Y. (July 2008). "Metallicities and activities of southern stars". Astronomy & Astrophysics. 485 (2): 571–584. arXiv: 0804.1128 . Bibcode:2008A&A...485..571J. doi: 10.1051/0004-6361:20078611 . ISSN   0004-6361.
  11. ↑ HD 42936, entry, SIMBAD. Accessed online December 24, 2019.


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