View source for Astronomy:HD 97048

{{Short description|Herbig Ae/Be star in the constellation Chamaleon}}
{{Starbox begin}}
{{Starbox observe
| epoch = J2000
| constell = [[Astronomy:Chamaeleon|Chamaeleon]]
| ra = {{RA|11|08|03.3106}}<ref name="Gaia DR2"/>
| dec = {{DEC|−77|39|17.4912}}<ref name="Gaia DR2"/>
| appmag_v = 8.38 - 8.48<ref name=gcvs/>
}}
{{Starbox character
| type = Herbig Ae/Be<ref name=vanDerPlas2017/>
| class = A0Vep<ref name=mk/>
| b-v =
| u-b =
| variable = [[Astronomy:Orion variable|INA]]<ref name=gcvs/>
}}
{{Starbox astrometry
| radial_v = 34.00±2.5<ref name=rv/>
| prop_mo_ra = {{val|−22.437|0.061}}<ref name="Gaia DR2"/>
| prop_mo_dec = {{val|1.305|0.059}}<ref name="Gaia DR2"/>
| parallax = 5.4105
| p_error = 0.0388
| parallax_footnote = <ref name="Gaia DR2"/>
| absmag_v = +2.47<ref name=xhip/>
}}
{{Starbox detail
| mass = 2.5<ref name=vanDerPlas2017/>
| radius = 1.7<ref name=fairlamb/>
| luminosity = 33<ref name=fairlamb/>
| temperature = 10,500<ref name=fairlamb/>
| gravity = 4.30<ref name=fairlamb/>
| metal =
| rotation =
| age_myr = 3<ref name=vanDerPlas2017/>
}}
{{Starbox catalog
| names = {{odlist | CD=−76 488 | HIP=54413 | SAO=256802 }}<ref name="Simbad"/>
}}
{{Starbox reference 
| Simbad = HD+97048
}}
{{Starbox end}}

'''HD 97048''' or '''CU Chamaeleontis''' is a Herbig Ae/Be star {{val|603|ul=ly}} away in the constellation [[Astronomy:Chamaeleon|Chamaeleon]].  It is a [[Astronomy:Variable star|variable star]] embedded in a dust cloud containing a [[Astronomy:Stellar nursery|stellar nursery]], and is itself surrounded by a dust disk.

HD 97048 is a young star still contracting towards the [[Astronomy:Main sequence|main sequence]].  Its brightness varies between magnitudes 8.38 and 8.48 and it is classified as an [[Astronomy:Orion variable|Orion variable]].<ref name=gcvs/>  It was given the [[Astronomy:Variable star designation|variable star designation]] CU Chamaeleontis in 1981.<ref name=ibvs/>  Its spectrum is also variable.  The spectral class is usually given as A0 or B9, sometimes with a [[Astronomy:Giant star|giant]] luminosity class, sometimes main sequence. The spectrum shows strong variable emission lines indicative of a shell surrounding the star.<ref name=skiff/>

HD 97048 is a member of the Chamaeleon T1 [[Astronomy:Stellar association|stellar association]] and is still embedded within the dark [[Astronomy:Molecular cloud|molecular cloud]] that it is forming from. It illuminates a small [[Astronomy:Reflection nebula|reflection nebula]] against the dark cloud.<ref name=rydgren/>

==Planetary system==
This star has a substantial dust disk having a central cavity with a 40−46&nbsp;AU radius<ref name=vanDerPlas2017/> The disk has a [[Chemistry:Carbon monoxide|carbon monoxide]] gas velocity kink and intensity gap at 130 [[Astronomy:Astronomical unit|AU]]s, which is suspected to be caused by a [[Astronomy:Super-Jupiter|superjovian]] planet.<ref name=Pinte2019/> In 2019, HCO<sup>+</sup> ion and [[Chemistry:Hydrogen cyanide|Hydrogen cyanide]] emission was detected from the disk, suggesting a large amount of gas is orbiting beyond 200 [[Astronomy:Astronomical unit|AU]] radius.<ref name=?/>
[[File:HD 97048 disk.png|left|thumb|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 [[Chemistry:Carbon monoxide|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 [[Astronomy:Protoplanet|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.<ref>{{Cite journal |last1=Pinte |first1=C. |last2=van der Plas |first2=G. |last3=Ménard |first3=F. |last4=Price |first4=D. J. |last5=Christiaens |first5=V. |last6=Hill |first6=T. |last7=Mentiplay |first7=D. |last8=Ginski |first8=C. |last9=Choquet |first9=E. |last10=Boehler |first10=Y. |last11=Duchêne |first11=G. |last12=Perez |first12=S. |last13=Casassus |first13=S. |date=2019-08-01 |title=Kinematic detection of a planet carving a gap in a protoplanetary disk |url=https://ui.adsabs.harvard.edu/abs/2019NatAs...3.1109P |journal=Nature Astronomy |volume=3 |issue=12 |pages=1109–1114 |doi=10.1038/s41550-019-0852-6 |arxiv=1907.02538 |bibcode=2019NatAs...3.1109P |s2cid=195820690 |issn=2397-3366}}</ref>

{{OrbitboxPlanet begin
| name = HD 97048 
| table_ref = <ref name=vanDerPlas2017/><ref name=Pinte2019/>
| period_unit = <!--Unit for orbital period, defaults to "day" (should be singular form)-->
}}
{{OrbitboxPlanet disk
| disk = protoplanetary disk
| periapsis = 40
| apoapsis = 850
| inclination = 40
}}
{{Orbitbox planet|exoplanet=b|mass={{val|2.5|0.5}}|semimajor=130|inclination=40}}{{Orbitbox end}}

==References==
{{reflist|refs=

<ref name=?>{{cite journal |arxiv=1907.08060 |doi=10.1051/0004-6361/201834388 |title=First detections of H13CO+ and HC15N in the disk around HD 97048 |year=2019 |last1=Booth |first1=Alice S. |last2=Walsh |first2=Catherine |last3=Ilee |first3=John D. |journal=Astronomy & Astrophysics |volume=629 |pages=A75 |s2cid=197544948 }}</ref>

<ref name=Pinte2019>{{cite journal |arxiv=1907.02538 |doi=10.1038/s41550-019-0852-6 |title=Kinematic detection of a planet carving a gap in a protoplanetary disk |year=2019 |last1=Pinte |first1=C. |last2=Van Der Plas |first2=G. |last3=Ménard |first3=F. |last4=Price |first4=D. J. |last5=Christiaens |first5=V. |last6=Hill |first6=T. |last7=Mentiplay |first7=D. |last8=Ginski |first8=C. |last9=Choquet |first9=E. |last10=Boehler |first10=Y. |last11=Duchêne |first11=G. |last12=Perez |first12=S. |last13=Casassus |first13=S. |journal=Nature Astronomy |volume=3 |issue=12 |pages=1109–1114 |bibcode=2019NatAs...3.1109P |s2cid=195820690 }}</ref>

<ref name="Gaia DR2">{{Cite Gaia DR2|5201128124701636864}}</ref>

<ref name="Simbad">{{cite simbad | title=HD 97048 | access-date=2019-01-23 }}</ref>

<ref name=fairlamb>{{cite journal|bibcode=2015MNRAS.453..976F|title=A spectroscopic survey of Herbig Ae/Be stars with X-shooter - I. Stellar parameters and accretion rates|journal=Monthly Notices of the Royal Astronomical Society|volume=453|issue=1|pages=976|last1=Fairlamb|first1=J. R.|last2=Oudmaijer|first2=R. D.|last3=Mendigutía|first3=I.|last4=Ilee|first4=J. D.|last5=Van Den Ancker|first5=M. E.|year=2015|doi=10.1093/mnras/stv1576|arxiv=1507.05967|s2cid=55938596}}</ref>

<ref name=skiff>{{cite journal|bibcode=2014yCat....1.2023S|title=VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009-2014)|journal=VizieR On-line Data Catalog: B/Mk. Originally Published in: Lowell Observatory (October 2014)|volume=1|last1=Skiff|first1=B. A.|year=2014}}</ref>

<ref name=rv>{{Cite journal | doi=10.1134/S1063773706110065 | bibcode=2006AstL...32..759G| title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system| journal=Astronomy Letters| volume=32| issue=11| pages=759–771| year=2006| last1=Gontcharov| first1=G. A.|arxiv = 1606.08053 | s2cid=119231169}}</ref>

<ref name=ibvs>{{cite journal|bibcode=1981IBVS.1921....1K |title=65th Name-List of Variable Stars |journal=Information Bulletin on Variable Stars |volume=1921 |pages=1 |last1=Kholopov |first1=P. N. |last2=Samus' |first2=N. N. |last3=Kukarkina |first3=N. P. |last4=Medvedeva |first4=G. I. |last5=Perova |first5=N. B. |year=1981 }}</ref>

<ref name=rydgren>{{cite journal|doi=10.1086/112694|title=Observations of young stars in the association Chamaeleon T1|journal=The Astronomical Journal|volume=85|pages=444|year=1980|last1=Rydgren|first1=A. E.|bibcode=1980AJ.....85..444R|doi-access=}}</ref>

<ref name=vanDerPlas2017>{{cite journal
 | title=Cavity and other radial substructures in the disk around HD 97048
 | last1=van der Plas | first1=G. | last2=Wright | first2=C. M.
 | last3=Ménard | first3=F. | last4=Casassus | first4=S.
 | last5=Canovas | first5=H. | last6=Pinte | first6=C.
 | last7=Maddison | first7=S. T. | last8=Maaskant | first8=K.
 | last9=Avenhaus | first9=H. | last10=Cieza | first10=L.
 | last11=Perez | first11=S. | last12=Ubach | first12=C.
 | journal=Astronomy & Astrophysics | display-authors=1
 | volume=597 | id=A32 | pages=19 | date=January 2017 | doi=10.1051/0004-6361/201629523 | bibcode=2017A&A...597A..32V |arxiv = 1609.02488 | s2cid=54495153 }}</ref>

<ref name=gcvs>{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|display-authors=0|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}</ref>

<ref name=mk>{{cite journal|bibcode=1977PASP...89..347I|title=Spectral changes in the pre-main-sequence star HD 97048|journal=Publications of the Astronomical Society of the Pacific|volume=89|pages=347|last1=Irvine|first1=N. J.|last2=Houk|first2=N.|year=1977|doi=10.1086/130131|doi-access=free}}</ref>

<ref name=xhip>{{cite journal
 | title=XHIP: An extended hipparcos compilation
 | last1=Anderson | first1=E. | last2=Francis | first2=Ch.
 | journal=Astronomy Letters
 | volume=38 | issue=5 | pages=331 | year=2012
 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
 | arxiv=1108.4971 | s2cid=119257644 }}</ref>
}}

{{Stars of Chamaeleon}}

{{DEFAULTSORT:HD 97048}}
[[Category:Circumstellar disks]]
[[Category:Henry Draper Catalogue objects|097048]]
[[Category:Objects with variable star designations|Chamaeleontis, CU]]
[[Category:Hipparcos objects|054413]]
[[Category:Durchmusterung objects|CD-76 488]]
[[Category:Hypothetical planetary systems]]

{{Sourceattribution|HD 97048}}