HD 42936

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]

HD 42936

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]
Distance153.5 ± 0.8 ly
(47.1 ± 0.3 pc)
Absolute magnitude (MV)5.78[2]
Details[7]
HD 42936A
Mass0.87 ± 0.05 M☉
Radius0.91 ± 0.02 R☉
Luminosity0.510 ± 0.003[8] L☉
Surface gravity (log g)4.44[9] cgs
Temperature5,138 ± 99 K
Metallicity [Fe/H]0.18 ± 0.09[10] dex
Rotation21.8+0.5
−16.5 d
Rotational velocity (v sin i)1.97 ± 0.14 km/s
Age10.9 Gyr
HD 42936B
Mass79.9 MJup
Age10.9 Gyr
Other designations
DMPP-3, CD−72°312, CPD−72°451, GC 7845, HD 42936, HIP 28941, SAO 256269[11]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

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

References
  1. 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. 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. 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. 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. 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. 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. 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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