HD 100453
11h 33m 05.5766s, −54° 19′ 28.5471″ An unusual structure around HD 100453 uncovered by ESO's SPHERE, a planet-hunting instrument installed on the Very Large Telescope in Chile[1] | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Centaurus
|
| Right ascension | 11h 33m 05.5766s |
| Declination | −54° 19′ 28.5471″ |
| Apparent magnitude (V) | 7.79[2] |
| Characteristics | |
| Evolutionary stage | Herbig Ae/Be star[3] |
| Spectral type | A9Ve |
| Apparent magnitude (g) | 7.735[4] |
| Apparent magnitude (B) | 8.07[3] |
| Apparent magnitude (R) | 7.63[3] |
| Apparent magnitude (K) | 5.60[3] |
| Details Myr | |
| Other designations | |
| CD-53 4102, GSC 08617-01438, HIP 56354, 2MASS J11330559-5419285, TYC 8617-1438-1, Gaia DR3 5345011040956367104 | |
| HD 100453A: | |
| HD 100453B: | |
| Database references | |
| SIMBAD | data |
HD 100453 is a
.Components
The apparent magnitudes of the visible components A and B are 7.8 and 15.9 respectively. The primary is a Herbig Ae/Be star, which is young but no longer accreting mass.[6] The secondary is an M4 class red dwarf star at the projected separation 120 AU from the primary.[7]
Circumstellar disks
The primary star is surrounded by two dust disks, separated by a gap. The disks are orbiting in different planes, misaligned by 72 degrees. The disk misalignment may be caused by a suspected superjovian planet orbiting within the gap,[3] roughly 15–20 AU from the primary.[8] The outer disk has a 2-arm spiral structure caused by the outer stellar companion HD 100453B.[7] The outer disk is rather massive at 0.0174M☉,[9] but is significantly depleted in gas, with a gas-to-dust mass ratio of no more than 4:1.[6]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period ([[]]s) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| inner disk | 0.315[3] AU | 46.05+0.88 −0.92 [3]° |
— | |||
| outer disk | 45[7] AU | 33.80+0.77 −0.72[3]° |
— | |||
The gas present in the disks is unusually depleted in nitrogen and hydrogen-bearing compounds and enriched in carbon monoxide.[5] Molecular hydrogen was not detected.[10] Solid silicate material present in the disks shows good crystallinity, with reduced amounts of amorphous material.[11]
No disks were detected around the companion star HD 100453B, with the upper limit on the amount of dust around it being 0.03 M🜨.[12]
References
- ^ "SPHERE reveals spiral disc around nearby star". European Southern Observatory. Retrieved 27 September 2024.
- ^ "HD 100453", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2022-06-15
- ^ S2CID 244773075
- ^ S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^
- ^ S2CID 18159262
- ^ S2CID 119120465
- S2CID 139106821
- S2CID 11639370
- S2CID 102486890
