SAO 206462

Last updated
SAO 206462
Observation data
Epoch J2000        Equinox J2000
Constellation Lupus [1]
Right ascension 15h 15m 48.4460s [2]
Declination −37° 09′ 16.024″ [2]
Apparent magnitude  (V)8.708 [3]
Characteristics
Evolutionary stage main sequence [2]
Spectral type F8V [3]
Astrometry
Radial velocity (Rv)−5.34±1.48 [2] km/s
Proper motion (μ)RA: −19.210 mas/yr [2]
Dec.: −23.268 mas/yr [2]
Parallax (π)7.4074±0.0240  mas [2]
Distance 440 ± 1  ly
(135.0 ± 0.4  pc)
Details
Mass 1.5 [2]   M☉
Radius 2.1 [2]   R☉
Luminosity 6.4 [2]   L☉
Surface gravity (log g)3.80 [2]   cgs
Temperature 6,313 [2]   K
Age 10.5 [4]   Myr
Other designations
HD 135344B, SAO 206462, CPD−36°6759, TYC 7324-1676-1, 2MASS J15154844-3709160
Database references
SIMBAD data

SAO 206462, also known as HD 135344B, is a young star, part of a binary star system, surrounded by a circumstellar disc of gas and clearly defined spiral arms. It is situated about 440 light-years away from Earth in the constellation Lupus. [5] The presence of these spiral arms seems to be related to the existence of planets inside the disk of gas surrounding the star. The disk's diameter is about twice the size of the orbit of Pluto. [6]

Contents

Discovery

The disc has been known since the 1990s, first detected based on an infrared excess. [7] Observations of the structure of the disc were presented in July 2009 by Carol Grady, astronomer of Eureka Scientific, headquartered in the Goddard Space Flight Center at NASA. It was the first of this class that exhibited a high degree of clarity and was observed using several space telescopes (Hubble, FUSE, Spitzer) and ground-based telescopes (Gemini Observatory and Subaru Telescope, situated in Hawaii), through an international research program of young stars and of stars with planets. A number of astronomers of different observatories collaborated. [8]

Planetary system

The pair of spiral arms around SAO 206462 have a rotation rate of −0.85  degrees per year, which are thought to be caused by a dynamically driving protoplanet within the disk, at a distance of 66±3  astronomical units and an orbital period of 424±25 years. This planet should be a challenge to be detected using direct imaging due to the presence of dust particles obscuring it, but could be detected and confirmed via high-resolution spectroscopic observations. [9]

Another planet candidate around SAO 206462 has been detected using observations of the JWST's NIRCam imaging instrument, with low signal-to-noise ratio, a mass of 0.8±0.3 MJ and a separation of 300 astronomical units. It has been dubbed CC1 (Companion candidate 1). Objects more massive than 2.2 MJ at distances of up to 120 AU have been ruled out by the observations. [10]

The SAO 206462 planetary system [9] [10]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(years)		 Eccentricity Inclination Radius
b(unconfirmed)—66±3424±25———
CC1(unconfirmed)0.8±0.3 MJ 300.8+9.9
−9.5		————

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific . 99 (617): 695. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 "SAO 206462". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 26 December 2016.
  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", Astronomy & Astrophysics, 650: A182, arXiv: 2104.11759 , Bibcode:2021A&A...650A.182G, doi:10.1051/0004-6361/202039519, S2CID   233393918
  5. ↑ http://informe21.com/ciencia-tecnologia/nasa-capta-fotografia-sao-206462-primera-estrella-forma-espiral La NASA capta una fotografía de SAO 206462, la primera estrella con forma espiral] Archived 2016-03-04 at the Wayback Machine . Informe21.com, 3 November 2011
  6. ↑ https://science.nasa.gov/science-news/science-at-nasa/2011/31oct_spiralarms/ 31 October 2011. Nasa Science.
  7. ↑ Coulson, I. M.; Walther, D. M. (June 1995). "SAO 206462 - a solar-type star with a dusty, organically rich environment". Monthly Notices of the Royal Astronomical Society . 274 (4): 977–986. Bibcode:1995MNRAS.274..977C. doi: 10.1093/mnras/274.4.977 .
  8. ↑ Grady, C. A.; Schneider, G.; Sitko, M. L.; Williger, G. M.; Hamaguchi, K.; Brittain, S. D.; Ablordeppey, K.; Apai, D.; Beerman, L.; Carpenter, W. J.; Collins, K. A.; Fukagawa, M.; Hammel, H. B.; Henning, Th.; Hines, D.; Kimes, R.; Lynch, D. K.; Ménard, F.; Pearson, R.; Russell, R. W.; Silverstone, M.; Smith, P. S.; Troutman, M.; Wilner, D.; Woodgate, B.; Clampin, M. (2009). "Revealing the Structure of a Pre-Transitional Disk: The Case of the Herbig F Star SAO 206462 (HD 135344B)". The Astrophysical Journal. 699 (2): 1822. Bibcode:2009ApJ...699.1822G. doi: 10.1088/0004-637X/699/2/1822 . S2CID   9298646.
  9. 1 2 Xie, Chen; Xie, Chengyan; Ren, Bin B.; Benisty, Myriam; Ginski, Christian; Fang, Taotao; Casassus, Simon; Bae, Jaehan; Facchini, Stefano (2024-12-18). "Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): Dynamical Evidence of a Spiral-Arm-Driving and Gap-Opening Protoplanet from SAO 206462 Spiral Motion". Universe. 10 (12): 465. arXiv: 2412.14402 . Bibcode:2024Univ...10..465X. doi: 10.3390/universe10120465 .
  10. 1 2 Cugno, Gabriele; Leisenring, Jarron; Wagner, Kevin R.; Mullin, Camryn; Dong, Roubing; Greene, Thomas; Johnstone, Doug; Meyer, Michael R.; Wolff, Schuyler G. (2024-01-05). "JWST/NIRCam Imaging of Young Stellar Objects. II. Deep Constraints on Giant Planets and a Planet Candidate Outside of the Spiral Disk Around SAO 206462". The Astronomical Journal. 167 (4): 182. arXiv: 2401.02834 . Bibcode:2024AJ....167..182C. doi: 10.3847/1538-3881/ad1ffc .
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