Astronomy:HD 141569
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Libra |
| Right ascension | 15h 49m 57.7483s[1] |
| Declination | −03° 55′ 16.342″[1] |
| Apparent magnitude (V) | 7.12[2] |
| Characteristics | |
| Spectral type | A2 Ve |
| Astrometry | |
| Proper motion (μ) | RA: −17.420(31)[1] mas/yr Dec.: −19.113(26)[1] mas/yr |
| Parallax (π) | 8.9597 ± 0.0293[1] mas |
| Distance | 364 ± 1 ly (111.6 ± 0.4 pc) |
| Details | |
| Mass | 3.1[3] M☉ |
| Luminosity | 24.2[3] L☉ |
| Temperature | 10,500[3] K |
| Age | 5 million[3] years |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 141569 is an isolated[5] Herbig Ae/Be star[6] of spectral class A2Ve[7] approximately 364 light-years away in the constellation of Libra. The primary star has two red dwarf companions (orbiting each other) at about nine arcseconds. In 1999, a protoplanetary disk was discovered around the star. A gap in the disk led to speculation about a possible extrasolar planet forming in the disk.
In November 2019, researchers studied HD 141569A (pre-main sequence B9.5 star) and made the first polarimetric detection of the inner ring circling the star. This may help better determine essential features of planetary development. According to the researchers, "Considering resolved imaging data from other high-contrast facilities, the HD 1415169A debris disc shapes up to be made of at least three, and potentially four nested rings, with spiral structures on the three spatially resolved rings [...] As such, it is an excellent laboratory for studying dynamically perturbed discs."[8][9]
Planetary system
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| Inner dust ring[10] | 0.7–1.3 AU | — | — | |||
| Inner disk | 86 AU | — | — | |||
| b (unconfirmed) | — | 225 | — | — | — | — |
| Outer disk | 250 AU | — | — | |||
Protoplanetary disk
In January 1999, NASA announced a protoplanetary disk around HD 141569. The Hubble Space Telescope showed that the disk appears to come in two parts (inner and outer). It superficially resembles the largest gap in Saturn's rings (known as the Cassini division).
The vast disk is 75 billion miles across (13 times the diameter of Neptune's orbit). The inner edge of the gap is 21 billion miles from the star. The relatively narrow gap lies approximately halfway between the inner and outer edges of the disk. Though already a fully formed star, HD 141569 is relatively young, probably only 1% through its lifetime as a stable star. The star is nearly three times more massive and 22 times brighter than the Sun. [11]
HD 141569 was first identified as a source that might have a disk in 1986 as a result of observations done with the Infrared Astronomical Satellite (IRAS). Thermal radiation emitted by the warmed dust was observed in images taken in June 2016 at the W. M. Keck Observatory.
Light from the central star which was reflected from dust particles in the disk was captured by Hubble's Near Infrared Camera and Multi-Object Spectrometer (NICMOS) at a wavelength of 1.1 micrometres. At the distance of HD 141569, the crisp resolution of the telescope and camera combination reveals structures as small as 1 billion miles across. Dust disks surrounding newly forming stars are common, but only a small number of adult stars are known to have disks; of these, only a handful have been imaged. Astronomers believe these disks must form and/or be replenished when older rocks and debris collide and break up into small particles.
The inner disk is strongly asymmetric for reasons unknown as of 2021.[12]
About 1 AU from the star, a faint dust ring was detected in 2021.[10]
Possible planet
The gap in the disk leads to the conclusion of a protoplanet in formation around the star. The planet does not have to be in the gap, however. It could either be sweeping up the dust and rocks from the disk as it travels in its orbit around the star, or the gravity of the planet could knock the dust out of one part of the disk.[11]
See also
References
- ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ Høg, E. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. doi:10.1888/0333750888/2862. ISBN 978-0333750889. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 3.2 3.3 Wyatt, M. C. et al. (July 2007), "Steady State Evolution of Debris Disks around A Stars", The Astrophysical Journal 663 (1): 365–382, doi:10.1086/518404, Bibcode: 2007ApJ...663..365W
- ↑ "HD 141569". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+141569.
- ↑ Aarnio, Alicia N.; Weinberger, Alycia J.; Stassun, Keivan G.; Mamajek, Eric E.; James, David J. (2008). "A Survey for A Coeval, Comoving Group Associated with HD 141569" (in en). The Astronomical Journal 136 (6): 2483. doi:10.1088/0004-6256/136/6/2483. ISSN 1538-3881. Bibcode: 2008AJ....136.2483A.
- ↑ Mendigutía, I.; Oudmaijer, R. D.; Mourard, D.; Muzerolle, J. (2017-01-11). "The compact Hα emitting regions of the Herbig Ae/Be stars HD 179218 and HD 141569 from CHARA spectro-interferometry" (in en). Monthly Notices of the Royal Astronomical Society 464 (2): 1984–1989. doi:10.1093/mnras/stw2515. ISSN 0035-8711. Bibcode: 2017MNRAS.464.1984M. https://academic.oup.com/mnras/article/464/2/1984/2333875.
- ↑ Murphy, Simon J.; Corbally, Christopher J.; Gray, Richard O.; Cheng, Kwang-Ping; Neff, James E.; Koen, Chris; Kuehn, Charles A.; Newsome, Ian et al. (2015). "An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue" (in en). Publications of the Astronomical Society of Australia 32: e036. doi:10.1017/pasa.2015.34. ISSN 1323-3580. Bibcode: 2015PASA...32...36M.
- ↑ Starr, Michelle (2 December 2019). "Astronomers Have Detected a Familiar Feature in a Far-Away Solar System". ScienceAlert.com. https://www.sciencealert.com/astronomers-have-imaged-the-kuiper-belt-around-another-star. Retrieved 2 December 2019.
- ↑ Bruzzone (2020). "Imaging the 44 au Kuiper Belt Analog Debris Ring around HD 141569A with GPI Polarimetry". The Astronomical Journal 159 (2): 53. doi:10.3847/1538-3881/ab5d2e. Bibcode: 2020AJ....159...53B.
- ↑ 10.0 10.1 Ganci, V. et al. (2021), "The GRAVITY young stellar object survey", Astronomy & Astrophysics 655: A112, doi:10.1051/0004-6361/202141103
- ↑ 11.0 11.1 "Hubble Views of Dust Disks and Rings Surrounding Young Stars Yield Clues". Hubble Space Telescope. NASA. 1999-01-08. http://hubblesite.org/newscenter/archive/releases/1999/03/. Retrieved 2008-07-13.
- ↑ Singh, G. et al. (2021), "Revealing asymmetrical dust distribution in the inner regions of HD 141569", Astronomy & Astrophysics 653: A79, doi:10.1051/0004-6361/202140319
External links
- "Hubble Views of Dust Disks and Rings Surrounding Young Stars Yield Clues". Hubble Space Telescope. NASA. 1999-01-08. http://hubblesite.org/newscenter/archive/releases/1999/03/. Retrieved 2008-07-13.
- Weinberger et al. (2000-07-12). "Stellar Companions and the Age of HD 141569 and its Circumstellar Disk". The Astrophysical Journal 544 (2): 937–943. doi:10.1086/317243. Bibcode: 2000ApJ...544..937W.
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