Misplaced Pages

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. It was given the variable star designation CU Chamaeleontis in 1981. 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.

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.

Planetary system

This star has a substantial dust disk having a central cavity with a 40−46 AU radius 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. 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.

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.

References

1. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
2. ^ 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.
3. ^ 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.
4. 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.
5. 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.
6. 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. S2CID 119257644.
7. ^ 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.
8. "HD 97048". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-23.
9. 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.
10. 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.
11. 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.
12. ^ 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.
13. 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.
14. 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. (2019-08-01). "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. ISSN 2397-3366. S2CID 195820690.

v t e Constellation of Chamaeleon
List of stars in Chamaeleon Chamaeleon in Chinese astronomy
Stars	Bayer α β γ δ δ ε ζ η θ ι κ μ μ ν π Variable R T Z RS RZ CT CU DI DR DX DY HR 3393 3543 3695 4170 4268 4385 4397 4507 4509 4649 4976 5188 HD 63454 (Ceibo) 115088 116852 Other 2MASS J11011926–7732383 AB ChaHα8 CHXR 73 L 34-26 WISEA J120037.79-784508.3
Exoplanets Cha 110913−773444 ChaHα8 b COCONUTS-2b HD 63454 b OTS 44
Star clusters η Chamaeleontis cluster
Nebulae Chamaeleon complex NGC 3195 IC 2631
Galaxies	NGC 2915
Category

• Chamaeleon
• Circumstellar disks
• Henry Draper Catalogue objects
• Objects with variable star designations
• Hipparcos objects
• Durchmusterung objects
• Herbig Ae/Be stars
• Hypothetical planetary systems