HD 166191

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HD 166191
Planetesimal Collison Around Star HD 166191 (Illustration).jpg
Artist's impression of the collision of two planetesimals around HD 166191
Observation data
Epoch J2000       Equinox J2000
Constellation Sagittarius
Right ascension 18h 10m 30.34s
Declination −23° 34′ 00.27″
Apparent magnitude  (V)8.35 ±0.02 [1]
Characteristics
Evolutionary stage main-sequence star
Spectral type F8 ±1 [2] or
G0V ±1 [3]
Astrometry
Radial velocity (Rv)–7.23 ±0.36 [4]  km/s
Proper motion (μ)RA: –4.931 ±0.025  mas/yr [4]
Dec.: –39.349 ±0.019  mas/yr [4]
Parallax (π)9.8830 ± 0.0232  mas [4]
Distance 330.0 ± 0.8  ly
(101.2 ± 0.2  pc)
Details [5]
Mass 1.6  M☉
Radius 2  R☉
Luminosity 4.1  L☉
Temperature 6000  K
Rotational velocity (v sin i)27 ±1 km/s
Age ∼10  Myr
Other designations
CD-23 14016, HIP  89046, IRAS  18074-2334, 2MASS  J18103033-2334003, TYC 6843-1557-1, WISE  J181030.32-233400.6, PPM 267987, GSC  06843-01557, UCAC2  22300839, YZ  113 12544, AKARI-IRC-V1 J1810303-233401, MSX6C  G007.4400-02.1430
Database references
SIMBAD data

HD 166191 is a young late-F or early G-type star in the constellation Sagittarius. It is surrounded by a large amount of dust. [2] [6] In 2019 it was reported in the Astronomer's Telegram that the star had brightened in the infrared, as was seen from Spitzer observations. [7] A study was published in 2022, reporting on the result of a follow-up campaign. This study showed that a dust cloud as large as the star did transit in front of it. This cloud was produced from a giant collision between two planetesimals. [5]

Contents

In early works the age of the system was not certain and ranged between 10-100 Myrs. The large amount of dust was interpreted as being produced by a recent collision of planetary embryos or by massive ongoing collisional grinding. [2] A later work did determine a younger age. The star was observed with ground-based spectroscopy and with Herschel. The researchers did find that the star is surrounded by a protoplanetary disk with a hole in the center. The silicate feature was also determined to be similar to primordial object. This would make the disk a so-called transitional disk, meaning it lies in between protoplanetary and debris disk. [3] Observations with the Submillimeter Array did however find a high amount of dust and only little amount of gas, indicating that the disk is a debris disk. [6] Another work determined that the disk is made up of two debris belts. An inner belt at ∼0.27 AU with a temperature of about 760 Kelvin (K) and an outer belt at ∼5 AU with a temperature of about 175 K. [5]

It was suggested that HD 166191 co-moves with HD 163296. [3] This was questioned in a later work. [5]

2018-2019 collision event

Follow-up observations of the 2018-2019 brightening event [7] were carried out with Spitzer, ASAS-SN and the Hereford Arizona Observatory. The disk has become brighter in the infrared since early 2018, reaching a maximum in mid 2019. ASAS-SN observed a dip during the infrared brightening. 142 ±0.3 days later the second dip was seen with both Spitzer and ASAS-SN, having a depth of ≳80% in the optical. The new dust from the collision was at first compact, having a size of 1 stellar diameter vertically and about 2–3 stellar diameters horizontally. After two orbital periods the clump grew larger, but also optical thinner and no further dips could be observed. The researchers find a semi-major axis of 0.62 AU for a circular orbit, but the researchers also point out that the orbit is likely eccentric. The collision released dust with a minimum mass of ~1–4 × 1023 g. The researchers think that a collision occurred between two large bodies with a sizes of ≳500 km (larger than 4 Vesta). [5] The event set off a chain reaction of impacts between the fragments of the first collision and other small bodies in the system. [8]

The HD 166191 planetary system [5]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
inner disk0.27 AU ——
planetesimal 1(hypothetical, pre-impact)>1.7–6.7 × 10−5 M🜨 0.62142——≥0.0785  R🜨
planetesimal 2(hypothetical, pre-impact)>1.7–6.7 × 10−5 M🜨 0.62142——≥0.0785  R🜨
outer disk5 AU ——

See also

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References

  1. ↑ Lasker, Barry M.; Lattanzi, Mario G.; McLean, Brian J.; Bucciarelli, Beatrice; Drimmel, Ronald; Garcia, Jorge; Greene, Gretchen; Guglielmetti, Fabrizia; Hanley, Christopher; Hawkins, George; Laidler, Victoria G.; Loomis, Charles; Meakes, Michael; Mignani, Roberto; Morbidelli, Roberto (2008-08-01). "The Second-Generation Guide Star Catalog: Description and Properties". The Astronomical Journal. 136 (2): 735–766. arXiv: 0807.2522 . Bibcode:2008AJ....136..735L. doi:10.1088/0004-6256/136/2/735. ISSN   0004-6256.
  2. 1 2 3 Schneider, Adam; Song, Inseok; Melis, Carl; Zuckerman, B.; Bessell, Mike; Hufford, Tara; Hinkley, Sasha (2013-11-01). "The Nearby, Young, Isolated, Dusty Star HD 166191". The Astrophysical Journal. 777 (1): 78. arXiv: 1308.0405 . Bibcode:2013ApJ...777...78S. doi:10.1088/0004-637X/777/1/78. hdl:1885/75390. ISSN   0004-637X.
  3. 1 2 3 Kennedy, G. M.; Murphy, S. J.; Lisse, C. M.; Ménard, F.; Sitko, M. L.; Wyatt, M. C.; Bayliss, D. D. R.; DeMeo, F. E.; Crawford, K. B.; Kim, D. L.; Rudy, R. J.; Russell, R. W.; Sibthorpe, B.; Skinner, M. A.; Zhou, G. (2014-03-01). "Evolution from protoplanetary to debris discs: the transition disc around HD 166191". Monthly Notices of the Royal Astronomical Society. 438 (4): 3299–3309. arXiv: 1312.4531 . Bibcode:2014MNRAS.438.3299K. doi: 10.1093/mnras/stt2435 . ISSN   0035-8711.
  4. 1 2 3 4 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.
  5. 1 2 3 4 5 6 Su, Kate Y. L.; Kennedy, Grant M.; Schlawin, Everett; Jackson, Alan P.; Rieke, G. H. (2022-03-01). "A Star-sized Impact-produced Dust Clump in the Terrestrial Zone of the HD 166191 System". The Astrophysical Journal. 927 (2): 135. arXiv: 2203.02366 . Bibcode:2022ApJ...927..135S. doi: 10.3847/1538-4357/ac4bbb . ISSN   0004-637X.
  6. 1 2 Garcia, Diego E.; Hughes, A. M. (2019-01-01). "Determining the Evolutionary Status of the Disk Surrounding HD 166191". American Astronomical Society, AAS Meeting #233. 233: 163.02. Bibcode:2019AAS...23316302G.
  7. 1 2 Su, K.; Rieke, G.; Sand, D. (2019-08-01). "Infrared Brightening in HD 166191 - A Young Star with Active Terrestrial Debris". The Astronomer's Telegram. 12986: 1. Bibcode:2019ATel12986....1S.
  8. ↑ "NASA Spots Giant Debris Cloud Created by Clashing Celestial Bodies". NASA Jet Propulsion Laboratory (JPL). March 18, 2022. Retrieved 2025-01-06.
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