| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Chamaeleon1 |
| Right ascension | 11h 08m 03.31097s2 |
| Declination | −77° 39′ 17.4908″2 |
| Apparent magnitude (V) | 8.38 - 8.483 |
| Characteristics | |
| Evolutionary stage | Herbig Ae/Be4 |
| Spectral type | A0Vep5 |
| Variable type | INA3 |
| Astrometry | |
| Radial velocity (Rv) | +34.00±2.56 km/s |
| Proper motion (μ) | RA: −22.526 mas/yr2 Dec.: +1.291 mas/yr2 |
| Parallax (π) | 5.4228±0.0249 mas2 |
| Distance | 601 ± 3 ly (184.4 ± 0.8 pc) |
| Absolute magnitude (MV) | +2.471 |
| Details | |
| Mass | 2.54 M☉ |
| Radius | 1.77 R☉ |
| Luminosity | 337 L☉ |
| Surface gravity (log g) | 4.307 cgs |
| Temperature | 10,5007 K |
| Age | 34 Myr |
| Other designations | |
| CD−76 488, HIP 54413, SAO 2568028 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 97048 or CU Chamaeleontis is a Herbig Ae/Be star 603 ly away in the constellation Chamaeleon. It is a variable star embedded in a dust cloud containing a stellar nursery, and is itself surrounded by a dust disk.
HD 97048 is a young star still contracting towards the main sequence. Its brightness varies between magnitudes 8.38 and 8.48 and it is classified as an Orion variable.3 It was given the variable star designation CU Chamaeleontis in 1981.9 Its spectrum is also variable. The spectral class is usually given as A0 or B9, sometimes with a giant luminosity class, sometimes main sequence. The spectrum shows strong variable emission lines indicative of a shell surrounding the star.5
HD 97048 is a member of the Chamaeleon T1 stellar association and is still embedded within the dark molecular cloud that it is forming from. It illuminates a small reflection nebula against the dark cloud.10
Planetary system
This star has a substantial dust disk having a central cavity with a 40−46 AU radius4 The disk has a carbon monoxide gas velocity kink and intensity gap at 130 AUs, which is suspected to be caused by a superjovian planet.11 In 2019, HCO+ ion and Hydrogen cyanide emission was detected from the disk, suggesting a large amount of gas is orbiting beyond 200 AU radius.12
In the system a kink in the velocity of carbon monoxide gas (CO 3–2) as well as a gap in the dust emission of the disk are seen as evidence for a jovian protoplanet. The protoplanet is located at 130 au from the star and has a mass of about 2.5 Jupiter masses. It is one of the lowest mass protoplanets discovered as of 2023.11
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| protoplanetary disk | 40–850 AU | 40° | — | |||
| b | 2.5±0.5 MJ | 130 | — | — | 40 | — |
References
References
- Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
- 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.
- Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
- van der Plas, G.; et al. (January 2017). "Cavity and other radial substructures in the disk around HD 97048". Astronomy & Astrophysics. 597: 19. arXiv:1609.02488. Bibcode:2017A&A...597A..32V. doi:10.1051/0004-6361/201629523. S2CID 54495153. A32.
- Irvine, N. J.; Houk, N. (1977). "Spectral changes in the pre-main-sequence star HD 97048". Publications of the Astronomical Society of the Pacific. 89: 347. Bibcode:1977PASP...89..347I. doi:10.1086/130131.
- Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
- Fairlamb, J. R.; Oudmaijer, R. D.; Mendigutía, I.; Ilee, J. D.; Van Den Ancker, M. E. (2015). "A spectroscopic survey of Herbig Ae/Be stars with X-shooter - I. Stellar parameters and accretion rates". Monthly Notices of the Royal Astronomical Society. 453 (1): 976. arXiv:1507.05967. Bibcode:2015MNRAS.453..976F. doi:10.1093/mnras/stv1576. S2CID 55938596.
- "HD 97048". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-23.
- Kholopov, P. N.; Samus', N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (1981). "65th Name-List of Variable Stars". Information Bulletin on Variable Stars. 1921: 1. Bibcode:1981IBVS.1921....1K.
- Rydgren, A. E. (1980). "Observations of young stars in the association Chamaeleon T1". The Astronomical Journal. 85: 444. Bibcode:1980AJ.....85..444R. doi:10.1086/112694.
- Pinte, C.; Van Der Plas, G.; Ménard, F.; Price, D. J.; Christiaens, V.; Hill, T.; Mentiplay, D.; Ginski, C.; Choquet, E.; Boehler, Y.; Duchêne, G.; Perez, S.; Casassus, S. (2019). "Kinematic detection of a planet carving a gap in a protoplanetary disk". Nature Astronomy. 3 (12): 1109–1114. arXiv:1907.02538. Bibcode:2019NatAs...3.1109P. doi:10.1038/s41550-019-0852-6. S2CID 195820690.
- Booth, Alice S.; Walsh, Catherine; Ilee, John D. (2019). "First detections of H13CO+ and HC15N in the disk around HD 97048". Astronomy & Astrophysics. 629: A75. arXiv:1907.08060. doi:10.1051/0004-6361/201834388. S2CID 197544948.