HD 169142

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HD 169142
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension 18h 24m 29.7800s[1]
Declination −29° 46′ 49.3286″[1]
Apparent magnitude (V) 8.16
Characteristics
Evolutionary stage Herbig Ae/Be star
Spectral type A9III/IVe[2]
Astrometry
Radial velocity (Rv)−3±2[3] km/s
Proper motion (μ) RA: −2.335[4] mas/yr
Dec.: −37.879[4] mas/yr
Parallax (π)8.7053 ± 0.0268[4] mas
Distance375 ± 1 ly
(114.9 ± 0.4 pc)
Details[2]
Mass1.65 M☉
Radius1.6 R☉
Luminosity8.6 L☉
Surface gravity (log g)4.05±0.05 cgs
Temperature7650±150 K
Metallicity [Fe/H]−0.375±0.125 dex
Rotational velocity (v sin i)55±5 km/s
Age7.5±4.5 Myr
Other designations
CD−29 14904, TYC 6856-876-1, GSC 06856-00876, 2MASS J18242978-2946492[1]
Database references
SIMBADdata

HD 169142 is a single Herbig Ae/Be star. Its surface temperature is 7650±150 K. HD 169142 is depleted of heavy elements compared to the Sun, with a metallicity Fe/H index of −0.375±0.125, but is much younger at an age of 7.5±4.5 million years.[2] The star is rotating slowly and has relatively low stellar activity for a Herbig Ae/Be star.[3] The star is suspected to be a binary with separation 9.9 AU.[5]

Planetary system[]

The star is surrounded by a complex, rapidly evolving protoplanetary disk with two gaps. In the 1995-2005 period the disk inner edge has moved inward by 0.3 AU.[6] Besides concentric dust rings, the disk contains spiral and globular structures.[7] The dust of the disk is rich in polycyclic aromatic hydrocarbons[8] and carbon monoxide.[9]

The first planet, a superjovian planet named , was suspected of carving a gap in the protoplanetary disk since 2013[2] and was directly imaged in 2014.[10] The knot (blob) which may be an accretion disk around outer planet was detected in 2015.[11]


Another planet, , was discovered in 2015.[11]

The HD 169142 planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
2.2+1.8
−1.2[12] MJ 		36.4 — — — —
hypothetical 0.2-2.1[12] MJ 50[11] — — — —
protoplanetary disk 20–250[2] AU 13[12]° —

References[]

  1. ^ a b c "CD-29 9873". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-03-22.
  2. ^ a b c d e Quanz, Sascha P.; Avenhaus, Henning; Buenzli, Esther; Garufi, Antonio; Schmid, Hans Martin; Wolf, Sebastian (2013), "Gaps in the Hd 169142 Protoplanetary Disk Revealed by Polarimetric Imaging: Signs of Ongoing Planet Formation?", The Astrophysical Journal, 766 (1): L2, arXiv:1302.3029, Bibcode:2013ApJ...766L...2Q, doi:10.1088/2041-8205/766/1/L2, S2CID 118643209
  3. ^ a b High-resolution spectroscopy of Vega-like stars — II. Age indicators, activity and circumstellar gas
  4. ^ a b c 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. Gaia EDR3 record for this source at VizieR.
  5. ^ The protoplanetary disc around HD 169142: circumstellar or circumbinary?, 2021, arXiv:2111.12732
  6. ^ Wagner, Kevin R.; Sitko, Michael L.; Grady, Carol A.; Swearingen, Jeremy R.; Champney, Elizabeth H.; Johnson, Alexa N.; Werren, Chelsea; Whitney, Barbara A.; Russell, Ray W.; Schneider, Glenn H.; Momose, Munetake; Muto, Takayuki; Inoue, Akio K.; Lauroesch, James T.; Hornbeck, Jeremy; Brown, Alexander; Fukagawa, Misato; Currie, Thayne M.; Wisniewski, John P.; Woodgate, Bruce E. (2014), "Variability of Disk Emission in Pre-Main Sequence and Related Stars. III. Exploring Structural Changes in the Pre-Transitional Disk in Hd 169142", The Astrophysical Journal, 798 (2): 94, arXiv:1410.8606, doi:10.1088/0004-637X/798/2/94, S2CID 118745797
  7. ^ Gratton, R.; Ligi, R.; Sissa, E.; Desidera, S.; Mesa, D.; Bonnefoy, M.; Chauvin, G.; Cheetham, A.; Feldt, M.; Lagrange, A. M.; Langlois, M.; Meyer, M.; Vigan, A.; Boccaletti, A.; Janson, M.; Lazzoni, C.; Zurlo, A.; De Boer, J.; Henning, T.; d'Orazi, V.; Gluck, L.; Madec, F.; Jaquet, M.; Baudoz, P.; Fantinel, D.; Pavlov, A.; Wildi, F. (2019), "Blobs, spiral arms, and a possible planet around HD 169142", Astronomy & Astrophysics, 623: A140, arXiv:1901.06555, Bibcode:2019A&A...623A.140G, doi:10.1051/0004-6361/201834760, S2CID 118873911
  8. ^ Seok, Ji Yeon; Li, Aigen (2016), "Dust and Polycyclic Aromatic Hydrocarbon in the Pre-Transitional Disk Around Hd 169142", The Astrophysical Journal, 818 (1): 2, arXiv:1512.04992, Bibcode:2016ApJ...818....2S, doi:10.3847/0004-637X/818/1/2, S2CID 118543568
  9. ^ MacÍas, Enrique; Anglada, Guillem; Osorio, Mayra; Torrelles, José M.; Carrasco-González, Carlos; Gómez, José F.; Rodríguez, Luis F.; Sierra, Anibal (2017), "Imaging a Central Ionized Component, a Narrow Ring, and the CO Snowline in the Multigapped Disk of HD 169142", The Astrophysical Journal, 838 (2): 97, arXiv:1703.02957, Bibcode:2017ApJ...838...97M, doi:10.3847/1538-4357/aa6620, S2CID 119267132
  10. ^ Reggiani, Maddalena; Quanz, Sascha P.; Meyer, Michael R.; Pueyo, Laurent; Absil, Olivier; Amara, Adam; Anglada, Guillem; Avenhaus, Henning; Girard, Julien H.; Gonzalez, Carlos Carrasco; Graham, James; Mawet, Dimitri; Meru, Farzana; Milli, Julien; Osorio, Mayra; Wolff, Schuyler; Torrelles, Jose-Maria (2014), "Discovery of a Companion Candidate in the Hd 169142 Transition Disk and the Possibility of Multiple Planet Formation", The Astrophysical Journal, 792 (1): L23, arXiv:1408.0813, Bibcode:2014ApJ...792L..23R, doi:10.1088/2041-8205/792/1/L23, S2CID 37427761
  11. ^ a b c Kanagawa, Kazuhiro D.; Muto, Takayuki; Tanaka, Hidekazu; Tanigawa, Takayuki; Takeuchi, Taku; Tsukagoshi, Takashi; Momose, Munetake (2015), "Mass Estimates of a Giant Planet in a Protoplanetary Disk from the Gap Structures", The Astrophysical Journal, 806 (1): L15, arXiv:1505.04482, Bibcode:2015ApJ...806L..15K, doi:10.1088/2041-8205/806/1/L15, S2CID 54708198
  12. ^ a b c Dong (董若冰), Ruobing; Fung (馮澤之), Jeffrey (2017), "What is the Mass of a Gap-opening Planet?", The Astrophysical Journal, 835 (2): 146, arXiv:1612.04821, Bibcode:2017ApJ...835..146D, doi:10.3847/1538-4357/835/2/146, S2CID 118989219
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