Astronomy:HD 97048
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 11h 08m 03.3106s[1] |
| Declination | −77° 39′ 17.4912″[1] |
| Apparent magnitude (V) | 8.38 - 8.48[2] |
| Characteristics | |
| Evolutionary stage | Herbig Ae/Be[3] |
| Spectral type | A0Vep[4] |
| Variable type | INA[2] |
| Astrometry | |
| Radial velocity (Rv) | 34.00±2.5[5] km/s |
| Proper motion (μ) | RA: −22.437±0.061[1] mas/yr Dec.: 1.305±0.059[1] mas/yr |
| Parallax (π) | 5.4105 ± 0.0388[1] mas |
| Distance | 603 ± 4 ly (185 ± 1 pc) |
| Absolute magnitude (MV) | +2.47[6] |
| Details | |
| Mass | 2.5[3] M☉ |
| Radius | 1.7[7] R☉ |
| Luminosity | 33[7] L☉ |
| Surface gravity (log g) | 4.30[7] cgs |
| Temperature | 10,500[7] K |
| Age | 3[3] Myr |
| Other designations | |
| Database references | |
| SIMBAD | 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.[2] 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.[10]
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.[11]
Planetary system
This star has a substantial dust disk having a central cavity with a 40−46 AU radius[3] 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.[12] 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.[13]
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.[14]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period ([[]]s) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| protoplanetary disk | 40–850 AU | 40° | — | |||
| b | 2.5±0.5 MJ | 130 | — | — | 40° | — |
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Samus, N. N. 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.
- ↑ 3.0 3.1 3.2 3.3 3.4 van der Plas, G. et al. (January 2017). "Cavity and other radial substructures in the disk around HD 97048". Astronomy & Astrophysics 597: 19. doi:10.1051/0004-6361/201629523. A32. Bibcode: 2017A&A...597A..32V.
- ↑ 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. doi:10.1086/130131. Bibcode: 1977PASP...89..347I.
- ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 7.3 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. doi:10.1093/mnras/stv1576. Bibcode: 2015MNRAS.453..976F.
- ↑ "HD 97048". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+97048.
- ↑ 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.
- ↑ Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009-2014)". VizieR On-line Data Catalog: B/Mk. Originally Published in: Lowell Observatory (October 2014) 1. Bibcode: 2014yCat....1.2023S.
- ↑ Rydgren, A. E. (1980). "Observations of young stars in the association Chamaeleon T1". The Astronomical Journal 85: 444. doi:10.1086/112694. Bibcode: 1980AJ.....85..444R.
- ↑ 12.0 12.1 Pinte, C.; Van Der Plas, G.; Ménard, F.; Price, D. J.; Christiaens, V.; Hill, T.; Mentiplay, D.; Ginski, C. et al. (2019). "Kinematic detection of a planet carving a gap in a protoplanetary disk". Nature Astronomy 3 (12): 1109–1114. doi:10.1038/s41550-019-0852-6. Bibcode: 2019NatAs...3.1109P.
- ↑ 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. doi:10.1051/0004-6361/201834388.
- ↑ Pinte, C.; van der Plas, G.; Ménard, F.; Price, D. J.; Christiaens, V.; Hill, T.; Mentiplay, D.; Ginski, C. et al. (2019-08-01). "Kinematic detection of a planet carving a gap in a protoplanetary disk". Nature Astronomy 3 (12): 1109–1114. doi:10.1038/s41550-019-0852-6. ISSN 2397-3366. Bibcode: 2019NatAs...3.1109P. https://ui.adsabs.harvard.edu/abs/2019NatAs...3.1109P.
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