# HD 142527

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Young star in the constellation of Lupus

HD 142527 Artist’s impression of the disc and gas streams around HD 142527 Observation data Epoch J2000 Equinox J2000 Constellation Lupus[1] Right ascension 15h 56m 41.88986s[2] Declination −42° 19′ 23.2746″[2] Apparent magnitude (V) 8.34[3] Characteristics Spectral type F6 III[3] Astrometry Radial velocity (Rv) -3.10[3] km/s Proper motion (μ) RA: -11.19[2] mas/yr Dec.: -24.46[2] mas/yr Parallax (π) 6.2791±0.0284 mas[4] Distance 519 ± 2 ly (159.3 ± 0.7 pc) Orbit[5] Primary HD 142527 A Name HD 142527 B Period (P) 23.50±0.85 yr Semi-major axis (a) 0.0678±0.014" (10.80±0.22 AU) Eccentricity (e) 0.47±0.01 Inclination (i) 149.47±0.71° Longitude of the node (Ω) 161.51±2.01° Periastron epoch (T) 2020.42±0.05 Argument of periastron (ω) (secondary) 186.45±0.48° Details HD 142527 A Mass 2.2±0.05[6] M☉ Radius 3.46±0.13[6] R☉ Luminosity 22.39±0.52[6] L☉ Surface gravity (log g) 3.15[7] cgs Temperature 6632[7] K Metallicity [Fe/H] 0.33[7] dex Age 4.4+0.49 −0.38[6] Myr HD 142527 B Mass 0.34±0.06[8] M☉ Radius 1.37±0.05[8] R☉ Luminosity 0.25±0.04[8] L☉ Temperature 3500±100[8] K Age 1.8+1.2 −-0.5[8] Myr Other designations CD−41°10447, HD 142527, HIP 78092, SAO 226389, WDS J15567-4219AB, 2MASS J15564188-4219232, TYC 846-688-1, Gaia DR2 5994826707951507200[3] Database references SIMBAD data

A [visual band](/source/Photometric_system#Photometric_letters) [light curve](/source/Light_curve) for HD 142527, plotted from *[ASAS-SN](/source/All_Sky_Automated_Survey_for_SuperNovae)* data[9]

**HD 142527** is a [binary star](/source/Binary_star) system in the [constellation of Lupus](/source/Lupus_(constellation)).[10][11] The primary star belongs to the [Herbig Ae/Be star](/source/Herbig_Ae%2FBe_star) class, while the companion, discovered in 2012, is a [red dwarf](/source/Red_dwarf) star or accreting protoplanet[12] with a projected separation of less than 0.1″.[13] The system is notable for its circumbinary protoplanetary disk and its discovery has helped refine models of planet formation. The orbit of companion is strongly inclined to the circumbinary protoplanetary disk.[12] A possible second companion was discovered in 2026.[14]

HD 142527 is listed in the International Variable star index as a UX Orionis variable, with a visible-light magnitude ranging from 8.27 to 8.60.[15]

## Protoplanetary disk

HD 142527 is an extremely young [star system](/source/Star_system), aged about 4.4 million years old[6] so it retains its [protoplanetary disk](/source/Protoplanetary_disk), which has a [mass](/source/Mass) of 15 [%](/source/Percent) of [the Sun](/source/Solar_mass) and a diameter of 980 [AU](/source/Astronomical_Unit).

Studies have shown eddies and vortex structures forming in the disk under the influence of two large [planets](/source/Planet).[11] The system is important as it allows [astronomers](/source/Astronomer) to observe the accretion process in [planetary formation](/source/Planet_formation).

In early 2013 an article was published by astronomers working with the ALMA telescope in [Chile](/source/Chile), which refers to the discovery of two massive flows of matter in the system.[11] Dust and gas is transferred from the periphery to the center through gravitational interaction with two giant planets that have a mass several times greater than the mass of [Jupiter](/source/Jupiter). Thus, the flows act as "pumps", pumping material from the edge of the center, "feeding" star. The planets themselves have not been detected so far, due to a dense shroud of gas. However, astronomers have proposed models that describe their existence.

[Japanese](/source/Japan) [astronomers](/source/Astronomer) have discovered particles of [ice](/source/Water)[16] in the disk.

The planetary system[13] Companion (in order from star) Mass Semimajor axis (AU) Orbital period (days) Eccentricity Inclination (°) Radius protoplanetary disk 140–550 AU 28° —

## References

1. **[^](#cite_ref-1)** [Roman, Nancy G.](/source/Nancy_Roman) (1987). ["Identification of a constellation from a position"](https://doi.org/10.1086%2F132034). *[Publications of the Astronomical Society of the Pacific](/source/Publications_of_the_Astronomical_Society_of_the_Pacific)*. **99** (617): 695. [Bibcode](/source/Bibcode_(identifier)):[1987PASP...99..695R](https://ui.adsabs.harvard.edu/abs/1987PASP...99..695R). [doi](/source/Doi_(identifier)):[10.1086/132034](https://doi.org/10.1086%2F132034). [Constellation record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?source=VI%2F42%2Fout&%2F%2Ftables=VI%2F42%2Fout&-c=HD+142527&-c.eq=J2000&-c.r=++2&-c.u=arcmin&-c.geom=r&-source=&-source=VI%2F42%2Fout&-out=RA1875&-out=DE1875&-out=Cst) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-van_Leeuwen2007_2-0) [***b***](#cite_ref-van_Leeuwen2007_2-1) [***c***](#cite_ref-van_Leeuwen2007_2-2) [***d***](#cite_ref-van_Leeuwen2007_2-3) van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". *Astronomy and Astrophysics*. **474** (2): 653–664. [arXiv](/source/ArXiv_(identifier)):[0708.1752](https://arxiv.org/abs/0708.1752). [Bibcode](/source/Bibcode_(identifier)):[2007A&A...474..653V](https://ui.adsabs.harvard.edu/abs/2007A&A...474..653V). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20078357](https://doi.org/10.1051%2F0004-6361%3A20078357). [S2CID](/source/S2CID_(identifier)) [18759600](https://api.semanticscholar.org/CorpusID:18759600). [Vizier catalog entry](http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=14774)

1. ^ [***a***](#cite_ref-SIMBAD_3-0) [***b***](#cite_ref-SIMBAD_3-1) [***c***](#cite_ref-SIMBAD_3-2) [***d***](#cite_ref-SIMBAD_3-3) ["HD 142527"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+142527). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 5 January 2017.

1. **[^](#cite_ref-4)** [Brown, A. G. A.](/source/Anthony_Brown_(scientist)); et al. (Gaia collaboration) (2021). ["*Gaia* Early Data Release 3: Summary of the contents and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202039657). *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **649**: A1. [arXiv](/source/ArXiv_(identifier)):[2012.01533](https://arxiv.org/abs/2012.01533). [Bibcode](/source/Bibcode_(identifier)):[2021A&A...649A...1G](https://ui.adsabs.harvard.edu/abs/2021A&A...649A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202039657](https://doi.org/10.1051%2F0004-6361%2F202039657). [S2CID](/source/S2CID_(identifier)) [227254300](https://api.semanticscholar.org/CorpusID:227254300). (Erratum: [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202039657e](https://doi.org/10.1051%2F0004-6361%2F202039657e)). [Gaia EDR3 record for this source](https://vizier.u-strasbg.fr/viz-bin/VizieR-S?Gaia%20EDR3%205994826707951507200) at [VizieR](/source/VizieR).

1. **[^](#cite_ref-Nowak2024_5-0)** Nowak, M.; Rowther, S.; Lacour, S.; Meru, F.; Nealon, R.; Price, D. J. (2024). ["The orbit of HD 142527 B is too compact to explain many of the disc features"](https://doi.org/10.1051%2F0004-6361%2F202347748). *Astronomy & Astrophysics*. **683**: A6. [arXiv](/source/ArXiv_(identifier)):[2402.03595](https://arxiv.org/abs/2402.03595). [Bibcode](/source/Bibcode_(identifier)):[2024A&A...683A...6N](https://ui.adsabs.harvard.edu/abs/2024A&A...683A...6N). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202347748](https://doi.org/10.1051%2F0004-6361%2F202347748).

1. ^ [***a***](#cite_ref-Guzman-Diaz2021_6-0) [***b***](#cite_ref-Guzman-Diaz2021_6-1) [***c***](#cite_ref-Guzman-Diaz2021_6-2) [***d***](#cite_ref-Guzman-Diaz2021_6-3) [***e***](#cite_ref-Guzman-Diaz2021_6-4) Guzmán-Díaz, J.; Mendigutía, I.; Montesinos, B.; Oudmaijer, R. D.; Vioque, M.; Rodrigo, C.; Solano, E.; Meeus, G.; Marcos-Arenal, P. (2021). ["Homogeneous study of Herbig Ae/Be stars from spectral energy distributions and *Gaia* EDR3"](https://doi.org/10.1051%2F0004-6361%2F202039519). *Astronomy & Astrophysics*. **650**: A182. [arXiv](/source/ArXiv_(identifier)):[2104.11759](https://arxiv.org/abs/2104.11759). [Bibcode](/source/Bibcode_(identifier)):[2021A&A...650A.182G](https://ui.adsabs.harvard.edu/abs/2021A&A...650A.182G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202039519](https://doi.org/10.1051%2F0004-6361%2F202039519).

1. ^ [***a***](#cite_ref-Luck_7-0) [***b***](#cite_ref-Luck_7-1) [***c***](#cite_ref-Luck_7-2) Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". *The Astronomical Journal*. **150** (3): 88. [arXiv](/source/ArXiv_(identifier)):[1507.01466](https://arxiv.org/abs/1507.01466). [Bibcode](/source/Bibcode_(identifier)):[2015AJ....150...88L](https://ui.adsabs.harvard.edu/abs/2015AJ....150...88L). [doi](/source/Doi_(identifier)):[10.1088/0004-6256/150/3/88](https://doi.org/10.1088%2F0004-6256%2F150%2F3%2F88). [S2CID](/source/S2CID_(identifier)) [118505114](https://api.semanticscholar.org/CorpusID:118505114).

1. ^ [***a***](#cite_ref-Christiaens2018_8-0) [***b***](#cite_ref-Christiaens2018_8-1) [***c***](#cite_ref-Christiaens2018_8-2) [***d***](#cite_ref-Christiaens2018_8-3) [***e***](#cite_ref-Christiaens2018_8-4) Christiaens, V.; Casassus, S.; Absil, O.; Kimeswenger, S.; Gomez Gonzalez, C. A.; Girard, J.; Ramírez, R.; Wertz, O.; Zurlo, A.; Wahhaj, Z.; Flores, C.; Salinas, V.; Jordán, A.; Mawet, D. (2018). ["Characterization of low-mass companion HD 142527 B"](https://doi.org/10.1051%2F0004-6361%2F201629454). *Astronomy & Astrophysics*. **617**: A37. [arXiv](/source/ArXiv_(identifier)):[1806.04792](https://arxiv.org/abs/1806.04792). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...617A..37C](https://ui.adsabs.harvard.edu/abs/2018A&A...617A..37C). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201629454](https://doi.org/10.1051%2F0004-6361%2F201629454).

1. **[^](#cite_ref-ASAS-SN_9-0)** ["ASAS-SN Variable Stars Database"](https://asas-sn.osu.edu/variables/lookup). *ASAS-SN Variable Stars Database*. ASAS-SN. Retrieved 6 January 2022.

1. **[^](#cite_ref-10)** ["Hd 142527"](http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+142527).

1. ^ [***a***](#cite_ref-casassus2013_11-0) [***b***](#cite_ref-casassus2013_11-1) [***c***](#cite_ref-casassus2013_11-2) Casassus, Simon; Van Der Plas, Gerrit M.; Perez, Sebastian; Dent, William R. F.; Fomalont, Ed; Hagelberg, Janis; Hales, Antonio; Jordán, Andrés; Mawet, Dimitri; Ménard, Francois; Wootten, Al; Wilner, David; Hughes, A. Meredith; Schreiber, Matthias R.; Girard, Julien H.; Ercolano, Barbara; Canovas, Hector; Román, Pablo E.; Salinas, Vachail (2013). "Flows of gas through a protoplanetary gap". *Nature*. **493** (7431): 191–194. [arXiv](/source/ArXiv_(identifier)):[1305.6062](https://arxiv.org/abs/1305.6062). [Bibcode](/source/Bibcode_(identifier)):[2013Natur.493..191C](https://ui.adsabs.harvard.edu/abs/2013Natur.493..191C). [doi](/source/Doi_(identifier)):[10.1038/nature11769](https://doi.org/10.1038%2Fnature11769). [PMID](/source/PMID_(identifier)) [23283173](https://pubmed.ncbi.nlm.nih.gov/23283173).

1. ^ [***a***](#cite_ref-Balmer2022_12-0) [***b***](#cite_ref-Balmer2022_12-1) Balmer, William O.; Follette, Katherine B.; Close, Laird M.; Males, Jared R.; De Rosa, Robert J.; Adams Redai, Jéa I.; Watson, Alex; Weinberger, Alycia J.; Morzinski, Katie M.; Morales, Julio; Ward-Duong, Kimberly; Pueyo, Laurent (2022). ["Improved Orbital Constraints and Hα Photometric Monitoring of the Directly Imaged Protoplanet Analog HD 142527 B"](https://doi.org/10.3847%2F1538-3881%2Fac73f4). *The Astronomical Journal*. **164** (1): 29. [arXiv](/source/ArXiv_(identifier)):[2206.00687](https://arxiv.org/abs/2206.00687). [Bibcode](/source/Bibcode_(identifier)):[2022AJ....164...29B](https://ui.adsabs.harvard.edu/abs/2022AJ....164...29B). [doi](/source/Doi_(identifier)):[10.3847/1538-3881/ac73f4](https://doi.org/10.3847%2F1538-3881%2Fac73f4). [S2CID](/source/S2CID_(identifier)) [249282495](https://api.semanticscholar.org/CorpusID:249282495).

1. ^ [***a***](#cite_ref-Hunziker2021_13-0) [***b***](#cite_ref-Hunziker2021_13-1) Hunziker, S.; Schmid, H. M.; Ma, J.; Menard, F.; Avenhaus, H.; Boccaletti, A.; Beuzit, J. L.; Chauvin, G.; Dohlen, K.; Dominik, C.; Engler, N.; Ginski, C.; Gratton, R.; Henning, T.; Langlois, M.; Milli, J.; Mouillet, D.; Tschudi, C.; Van Holstein, R. G.; Vigan, A. (2021), "HD 142527: Quantitative disk polarimetry with SPHERE", *Astronomy & Astrophysics*, **648**: A110, [arXiv](/source/ArXiv_(identifier)):[2103.08462](https://arxiv.org/abs/2103.08462), [Bibcode](/source/Bibcode_(identifier)):[2021A&A...648A.110H](https://ui.adsabs.harvard.edu/abs/2021A&A...648A.110H), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202040166](https://doi.org/10.1051%2F0004-6361%2F202040166), [S2CID](/source/S2CID_(identifier)) [232233697](https://api.semanticscholar.org/CorpusID:232233697)

1. **[^](#cite_ref-14)** Tran, T. M. H.; Langlois, M.; Flasseur, O.; Augereau, J.-C.; Boccaletti, A.; Delorme, P.; Gratton, R.; Kaszczyc, A.; Lagrange, A.-M. (2026-05-06), [*Exploration of the inner region of the system HD 142527*](http://arxiv.org/abs/2605.04869), arXiv, [doi](/source/Doi_(identifier)):[10.48550/arXiv.2605.04869](https://doi.org/10.48550%2FarXiv.2605.04869), arXiv:2605.04869, retrieved 2026-05-10

1. **[^](#cite_ref-IVSI_15-0)** ["NSV 20441"](https://www.aavso.org/vsx/index.php?view=detail.top&oid=58876). *The International Variable Star Index*. AAVSO. Retrieved 10 November 2022.

1. **[^](#cite_ref-16)** Honda, M.; Inoue, A. K.; Fukagawa, M.; Oka, A.; Nakamoto, T.; Ishii, M.; Terada, H.; Takato, N.; Kawakita, H.; Okamoto, Y. K.; Shibai, H.; Tamura, M.; Kudo, T.; Itoh, Y. (2009). "Detection of Water Ice Grains on the Surface of the Circumstellar Disk Around HD 142527". *The Astrophysical Journal*. **690** (2): L110–L113. [Bibcode](/source/Bibcode_(identifier)):[2009ApJ...690L.110H](https://ui.adsabs.harvard.edu/abs/2009ApJ...690L.110H). [doi](/source/Doi_(identifier)):[10.1088/0004-637X/690/2/L110](https://doi.org/10.1088%2F0004-637X%2F690%2F2%2FL110).

v t e Constellation of Lupus List of stars in Lupus Lupus in Chinese astronomy Stars Bayer α (Uridim) β γ δ ε ζ η θ ι κ λ μ ν1 ν2 ξ ο π ρ σ τ1 τ2 υ φ1 φ2 χ ψ1 ψ2 ω Flamsteed 1 (i) 2 (f) Variable RU EX GG GQ HR II IL IM KT (d) V407 V462 HR 5362 5364 5401 5651 (e) 5724 (k) 5825 (g) 5943 5967 HD 134004 135344 136164 141943 142527 143811 Other Gliese 588 HIP 70849 Lupus-TR-3 SSSPM J1549−3544 WASP-132 Exoplanets GQ Lupi b HIP 70849 b Lupus-TR-3b WASP-178b Star clusters NGC 5749 NGC 5822 NGC 5824 NGC 5927 NGC 5986 Nebulae IC 4406 NGC 5882 Galaxies IC 4444 NGC 5530 NGC 5643 Astronomical events SN 1006 Category

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