HD 97048

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HD 97048
Observation data
Epoch J2000       Equinox J2000
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  mas [1]
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
CD−76 488, HIP  54413, SAO  256802 [8]
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]

Velocity kink for the CO gas and gap in the disk, showing the presence of a protoplanet HD 97048 disk.png
Velocity kink for the CO gas and gap in the disk, showing the presence of a protoplanet

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]

The HD 97048 planetary system [3] [12]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
([[]]s)
Eccentricity Inclination Radius
protoplanetary disk40850 AU 40°
b2.5±0.5  MJ 13040°

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References

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