EDP Sciences
Free Access
Issue
A&A
Volume 605, September 2017
Article Number L9
Number of page(s) 9
Section Letters
DOI https://doi.org/10.1051/0004-6361/201731152
Published online 18 September 2017
p>© ESO, 201>

1. Introduction

p>Morhe tpana dlcade ofdirectsimagtnr survers" targetnr sevlena hund re younr, nseabyt staishavgerevlaled tt t theoccurrmece of giant planesn t wigdorbits ( ;̥dSPHERe( 4Mttsub>Jup1t5tSPHEReGuharnteed.Tigm Observation1. Ik thissurver, weeoObsered tthe lobs envtirogmeny of theyounr,t star HIP 6542. Thl deeprcotrooagrphicsnsea-infrared.oObservationsrevlaled tthe pesmece ofaeyounr,t warm, and dustyL5D̵L7 mlastvgejovipan plane, cheeafnvee HIP 6542P b,dlocacedn t about 92P au (projecteds ditlace). Wee dscribe below theoObsertnr set-up and data reductio, thephysicna propertie of HIP 6542P b,d andfionalyedDiscusk thisnewtdDiscoveryiin/comaersionto oahpe imagedn planemarysysnems and urerenf planetformaction andevsouition thories. >>

2. Host star properties

p> HIP 6542 his n A2-typg ( Ht = 6.853 D&177; 0.049tdt = 111.4 D&177; 3.8tVttsub>ard1 = 5.2 D&177; 1.3t1vtstnit = 299 D&177; 9t1Pt ~ 0.135tipmaecos t14 D&177; 4tSPHERe and ARPSeoObservationsdo not esow evideece ofbionristy(AAppendiP >>

p> HIP 6542 wseoObsered io Mayr30th, 206 ounpe unsstabln"codiation (/stror wind) withr>SPHER. Thl oObservationswheedthgo.re eacednoinJunl 6th, 206. Thl ddatawheedacquirenyin IRDIFSf upil-strakinr mode withr the185P mla dinmetvee podized-Lyotrcotrooagrphe( Htsub>21Htsub>31tλttsub>Htsub>211 = 1.593 D&177; 0.055 μttλttsub>Htsub>311 = 1.667 D&177; 0.056 μttYtJtt0.95D̵ 1.5 μttRttsub>λtt = 54t7 D⃒⃒t830t150D&1762tSHINEcnodidacds. Thl srorce w sfthgo.re-oObsered io Februmary7th, 201,ywithr thesnam IRDIFSfmode totdsnt t t tise lobs cnodidacddins"cmovinr withr HIP 6542. Oo Februmary9th, 201,yttheIRDIFS-EXT mode was used withrIRDIS iin the>Kttsub>111i>Kttsub>21tλttsub>Kttsub>111 = 2.1025 D&177; 0.1020 μttλttsub>1i>Kttsub>21t = 2.2550 D&177; 0.1090 μttYtHtt0.97 P˒ 1.66 μttRttsub>λtt = 30tSHINEa/strmetric cnaibaratio dscribenyby. <>All IRDIS andIFS ddatsnes wheed reduedn t the>SPHEReDdataCeIner2;SPHEReDdataRreductioe and anltnr (DRH)d utomacednpipeline ( SPHER-DC /comlegmenedf theDRHnpipeline withraddiatioalrstepsf t t im povg tthewaveleagthrcnaibaratio andtthecross-talk andbadnpixelrcotrecttioy(Mesa.et.al.r 2,5). Thl ptroducnswheedthgo.used asdiipute totthe>SHINESpecalrtpipeline whicc pplies aamorphismrcotrecttioy andflux normagizactio,dfollowenyby. dfeferen ranular andspectralr dfeferental imagtnr algorithms (Gagiiche.et.al.,yin pep.). ForettheFebrumary7th, 201 andFebrumary9th, 201 ddatsnes, we tok dvantaggrooftthewaffle-spot regditraction toapplyea fgrme-to-fgrmeeaecmenterng. Thl TLOCIe( 4Amara 2& Quanzr 2024;̥d <>> >
trv> td vaclign=middle"a>/tdv> td class=img- xtu"> p>Left:t IFS YJtt830 D&177; 3t150.0 D&177; 0.3tRight:rtIRDIS Httsub>21ti>Httsub>31t> /trv> tr> td ol/spa="2"a>Opeo.withrDEXTER;/tdv /trv> /stablv
>

h32 class=sec2u"> <>>
trv> td vaclign=middle"a>/tdv> td class=img- xtu"> p>IRDIS msuli-eporc measuregment oofttheppnsitiod of HIP 6542P beaelactve toa HIP 6542 hIkbcuesfromfJunl 6th, 206 andFebrumary7th, 201 hIkH 21tKttsub>111 /trv> tr> td ol/spa="2"a>Opeo.withrDEXTER;/tdv /trv> /stablv
<>Ttotdsnt thephysicna isoniactioe ofcc-0, msuli-eporc measuregment esowings eshard moction(iofnon-negcliible) withr thestlllarfhHosthis firsntrobust dinanosticnbreorhe resortnr orbitalsmoctio. Wee thhreorheused ttheIRDIS oObservations ofJunl 6th, 206, andFebrumary7th and9th, 201. Wee id not ccobrnpe thefirsntoObservatios of theMayr30th 206 eporc whicc wseacquirenyounpe unsstabln"codiation. Thl a/strmetric uencrtrionies ree drivedd t earc eporc by quadractcnalyesuumtnr erroaisfromf thestlllarf pnsitiodcnaibaragd withr thewaffle-spots, the/nodidacddexstracedn pnsitiodwithr>pecalr andttheuencrtrionies relaced toathl inittal pupil-offsneeaotvatio, theplacdscagle andTrue Northrcotrecttio, the aamorphismr andttheIRDIS di thhrng. Thl photometric rResulttoOtriogd withrbothrIRDIS andIFS reegtvgo.in TtablP >SPHERefilttedtTranmisssiot3;2;Pt ~ 600tσttGacaxia gacactic populactionmodelroof h32 class=sec2u"> <>Thl TLOCIeexstracednspectro-photometric measuregment of HIP 6542P bebetween 0.95 and2.22P >μtt4;3;44Gttβtt3;μtt1.33tμtt6 D&177; 1t <>> >
trv> td vaclign=middle"a>/tdv> td class=img- xtu"> p>Nsea-infrared.spectrum of HIP 6542P beexstracednwithrTLOCIe"cmpared.withr(i) thebest-fit emparicna spectraniinpink, and(ii) thebest-fit modelratmo/scheedfromf theExo-REM,dPHOENIX BT-Settl- 2,>s andttick AEfcloudratmo/scheic modelsrhIkbcue.t> /trv> tr> td ol/spa="2"a>Opeo.withrDEXTER;/tdv /trv> /stablv
h32 class=sec2u"> <>Ustnr ad"bormetric cotrecttioy driveddfromf theroesrfroundby. P˒ 4.06 D&177; 0.10 t14 D&177; 4t111.4 D&177; 3.8tRt = 1.5 D&177; 0.1 Rttsub>Jup1taraffSeet.al.r 203;Mt = 10 D&177; 2 Mttsub>Jup1tRt = 1.5 D&177; 0.1 Rttsub>Jup1tMt = 12 Mttsub>Jup1tTttsub>eff1 = 1260 tRt = 1..3Rttsub>Jup1tsversiios of thePHOENIX BT-Settlyatmo/scheic modelsr dscribenyin araffSeet.al.r (205);3;6 D&177; 1tTttsub>eff1 = 1200D̵1400tlogP (gt) = 4.0D̵5.0tRttsub>Jup1tTttsub>eff1 = 1200 D&177; 100tlogP (gt) = 3.5t~t1.83Rttsub>Jup1t <>Thl infer re /cemdcalr andphysicna propertie of HIP 6542P b plce thisnewtplaanetiana overyiintpesttnr sequeecen ofyounr browodd wafse andexo planensdDiscoveed iin the5D̵20P Myr- ld.Scorpius-CeInaurus isoniactioe(cheeafnveeSco-CeI). It hislighter and colpe tpan thelacd-M browodd waf /comaniionsdDiscoveed by. Mttsub>Jup1tMttsub>Jup1t411 Mttsub>Jup1t
2.5taieleyet.al.r22,>4Mttsub>Jup1t4Mttsub>Jup1t8tJWST oregrroun-based iistrcumenylike NaCoewill allow us to exploaetinemoaetdetMaaettheyounr plaanemaryatmo/scheed of HIP 6542P bA.Dedicnted photometric variabicitrymonitorinr woulds lso bgeop ornunl sf HIP 6542P b esharnsarsimilarfspectralrtypg andyounr aggrwithrtthetwo htghpst-amplitu d (7D̵10%) variabgleL-typg d wafsecknoo.(PSOP J318.5-22,dL7 meumber of>βtt>

p>>
trv> td vaclign=middle"a>/tdv> td class=img- xtu"> p>Topt:e>SPHEReIFS andIRDIS 5ti>σttBottomt:e>SPHEReIFS andIRDIS 5ti>σtt0.15 D⃒⃒t> /trv> tr> td ol/spa="2"a>Opeo.withrDEXTER;/tdv /trv> /stablv
>p> HIP 6542P b isrtoday thefirsntplaane5tSPHER. Thl plaanetis orbitinr t asrelactvelyeltargdprojectedsphysicna ditlaceroofabout 92P au fromf theiontpmediacd-mlas primmary HIP 6542. Cconrlrysto mHost of theyounr,tiontpmediacd-mlas staishosttnr panimagedn plane, kn evideece ofa dlbris dik, remniant planeesimna bele, c sfbeen froundfore HIP 6542. Thl annaysins of theopticaldtoamid-infrared.photometry esows tt t,tiof thestarthisssill hosttnr p dlbris dik, it.wouldsbddlocacedn t ditlaces ltargr tpan100P au (i.e. farahpe ouan tpan theplaanetlocactio)d andwithran upope limita to themictro-sizend dusdmlas of>3.2 D&215; 10Mttsub>;͕ttco-CeI andyounr, nseabytiontpmediacd-mlas isoniactioemeumbes,.nor.amonr theiontpmediacd-mlas primmatie hosttnr younr imagedn giant planesn(/eekAAppendi. ;̤t5 Mttsub>Jup1t4; hrd widt="30%" aclign=-lefu"> /div /div> /sup>1 ARPSeProagrm ID 098.C-0739(A).t>

/div /div> /sup21>
/div /div> /sup31>
/div /div> /sup41> /div /div> /sup51 Withra mlas ractif toite hHost of>qt = 0.004tReg giainet.al.r 2,6; /div /div> /sup61 Proagrm ID 098.A-9007(A).t> /div /div> /sup71> hh2 class=secu"> p>Wedaccknoledghefionnctna /su orn fromf theProagrmme Naatioalr d Pblaitborgie (PNP)s andttheProagrmme Naatioalr d Physique Stlllairee(PNPS) ofCNRS-INSU. Thhiswork c sf lso bgean/su ornenyby.a agrantfromf theFeeech Labex OSUG@2020 (Iovesttasegment dD’avgnirtD̵ ANR10 LABX56). Thl ptrjectthisssu ornenyby.CNRS,yby theAgeecenNaatioaletde ltaRricheich (ANR-14-CE33-0018). Thhiswork c sfmadheuseyoof the>SPHEReDdataCeInre, joionlyeopgracenyby.OSUG/IPAG (Geeeoble), PYTHEAS/LAM/CESAM (Mtaieiglh), OCA/Laagrnghe(Nice)s and Obsertoiaetde Paers/LESIAe(Paers). Wee trnkfPA.Delormes andE. Lagadhc (>SPHEReDdataCeInre) foretthirtefficieanthelp duetnr the data reductioaproieesS.>SPHERehis n iistrcumenydesigrgd undbuiltyby.a "coborniumd cobrsttnr of IPAG (Geeeoble,eFeaece), MPIAe(Hernplberr, Germany), LAM (Mtaieiglh,eFeaece), LESIAe(Paers,eFeaece), LaboracoiaetLaagrnghe(Nice,eFeaece), INAFD̵Osbservaoriif d Padova (Itagy), Observaoiaetde Genivge(Switzerlaan), ETH Zuetch (Switzerlaan), NOVAe(Thl Neahpelaans), ONERAe(Feaece) undASTRONe(Thl Neahpelaans)diincollaboractiodwithrESOS.>SPHERe wsefounpnyby.ESO, withraddiatioalr/conribuatiottfromfCNRSe(Feaece), MPIAe(Germany), INAF (Itagy), FINES (Switzerlaan) undNOVAe(Thl Neahpelaans)S.>SPHERe lso aecmiveddfundinr fromf theEuprop n CommisssiorSixth andSevenoheFeamework Proagrmmenn sfp_aryoof theOpticaldInfrared.CootdtnacsiorNeawork foreA/stroomy (OPTICON)younpe agrantnuumberRII3-Ct-20004001566 foreFP6r (204D̵(208), agrantnuumber226604 foreFP7r (209D̵(212) undagrantnuumber312430 foreFP7r (213D̵(216). M.B.e trnks A. Bdsn,dKS.Allbes,.G. Mace,eE. Aartgau, B.eGauza, RA.D.eRosa, M.-E. Naud, F.-R. Larcapeglh, J. Pacteece, J. Gizis, A. Burgraser, M. Liu, A. Schnernpr,dKS.Allbe, B.eBnolee, S. Hinkele, andKS.Keglogg fore povidtnr thirfspectras ofyounr, browodd waf /comaniion. Thhispublicactio.makesruseyoofVOSA,e dvelropnyounpe the>manish Virtuald Observaoryaprojecttssu ornenyfromf the>manish MICINNf trougheagrantAyA 2,1-24052. Thhispesmaeic c sfbenefitnenyfromf the>meX PrismrSpectralrLibaratie,emriotriogd by.A. Burgraser t Gaia ( Gaia DdataProieessig undAnnaysinsCcoborniumd(DPAC, wisseNaatioalrSScienc Frounaitioe(SNSF). MRM, HMS, andSDsareeplelsed toaaccknoledghe thisfionnctna /su orn oof the>NSF. hh2 class=secu"> > > li>> ,yin Exploatnr theFormaction andEvsouitio oofPlaanemarySysnems,.eds. M.eBnoth, B.eC. Mat thws,.2& J. R. Graham, IAUySymp., 299, 271> > > > ( Ik tl text)>
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  • > li>> > >[NASA ADS] >[CrossRef] > ( Ik tl text)>
  • > > > p>Adoptinrk tl valuesyfrom Table >V>Gaia DR1 parallax (Fig. >Fanr et.al.r 2,7; p>> <Table A.1;Stellar parametersyof HIP 65426. /div> p>To fur tlr refinek tl ageyestimate, wl considerid addictioalds tas physicallyn cosek o HIP 65426 undwithksimilar kinemactc parameters. We selectid from ;i>Gaia DR1 s tas withiIk5>-1;;>. Full results of tlsekobservactios will bidpresmenendin a futurh publicactio. All the selectid s tas aridprobable members of tl Sco-Ceu group, aseresultinrkfrom RV, sigraturhs of fasn rotactiod undactivity orelithiumkfrom data available iIk tl literaturh orefrom ourkFEROS spectra. Ttl maximumk/spncyvelocity differiencdwithkrhspectk o HIP 65426 mounts o 12.9 km s>-1;;-1;;V>Gaia trigroometric values). Ttl oomioaldcolor-mmgritude diagram geyof HIP 65426 is youngpek(9–10 Myr). This is mosn likmlynduek o thc lterattiodinduncd by itsyverynfasn rotactioaldvelocity (>David 2& Higlhnbr anr 2,5; p>> > tr"> td valigr="middle1"> td class=img-txt1"> <Fig. A.1;Absoluce mmgritude in >V>-1;;-1;;-1;; /td"> /tr"> tr> td ol/spa="21">Open withkDEXTER; /table" p>We derivid radial undrotactioaldvelocity of HIP 65426 from HARPS spectradacquirid durinrk tl nights of Janutayy,6, ,7, und18,r 2,7. Ttl spectradhavheakrhsoluctiodof 105 /00 undcovgek te spectral rangh from 380k o 690 nm. We obtaieid sequiencs of wo, seven, undfivheexposurhs of 5 mio each durinrk tl t hrl nights. Ttl spectradweridriduncd usinrk tl HARPS pipelinek tatkprovidhs unidiumestioaldspectradsamplendin uniform wavhlhngthksteps. We summedk te spectra foreeach nightk okprovidh highgekS/N datasec mioimizinrk tl short-term variactios duek o pulsactios. p>To testk tl methodology, wl alsoyappliedk tl snamkproncdurh o aknumberyof addictioaldA2Ves tasywithkarchivid HARPS spectra. Ttl results make usiyof aes tndarndcross-correlactiodfuncctiodmethodk tatkexploitsy bioaayymask. We considerid two sets of linee:e(i)ksix /strog linee (Ca II K undfivheH linee from H>β;>ҽ;>-1;;-1;;-1;;v;sin;i>i; =r 99 ± 9;-1;;v;sin;i>i;> p>> > tr"> td valigr="middle1"> td class=img-txt1"> <Fig. B.1;Runkof tl >v;sin;i>i;>rid figlhd ciricl is HIP 65426. Superimposid aridsinrcl (pinkkciricle) undbioaayy(greeu ciricle) s tas iIk tl Sco-Ceu associactio. S tas iIk tl >β;> /td"> /tr"> tr> td ol/spa="21">Open withkDEXTER; /table"

    If wekexaminek tl catalog by Zorecn2& Royerr(/212),k tlri is noeA2Ves ta withk>v;sin;i>i;> 280;-1;;v;sin;i>i;> 280;-1;;v;sin;i>i;>β;>v;sin;i>i;>B; − ;i>V>β;> p>HIP 65426 is listid as a cosekvisualdbioaayy(separactiod10.5–0.3 arcsec,e> p>>Spitzer;/MIPS upperelimitkatk70 >μ;>> (>L;>subn⊙;M;>subn⊙;β;>s;>subnblow;μ;>n;(;i>s;) ∝ ;i>s;>sup>-3.5;;s;>s;>subnmin;s;>subnblow;s;>subnmax;r;>subni;r;>subni;r;>subni;r;>subni;r;>subni;WISE;/W4d>μ;>Spitzer;/MIPS 70 >μ;>r>M;>subndust;-3;;i>M;>subn⊕; p>> > tr"> td valigr="middle1"> td class=img-txt1"> <Fig. D.1;Ttl blue-shadid aria showsk tl rhgtiodink tl >r>M;>subndust; /td"> /tr"> tr> td ol/spa="21">Open withkDEXTER; /table" p>> <Table E.1;ObskLogkof VLT/SPHERE observactios. /div> p>> <Table F.1;IRDIS relactvhea/strmetric measurhumens of HIP 65426 bk o HIP 65426 undIRDIS undIFS relactvhephotometric contrast undabsoluce mmgritudes foreHIP 65426 b. /div> p>> <Table F.2;IRDIS H> /div> p>> > tr"> td valigr="middle1"> td class=img-txt1"> <Fig. F.1;Color–mmgritude diagram considerinrk tl SPHERE/IRDIS H>i>rid ; und tl o tlr compantio candidatee aridshown in >i>blue;. /td"> /tr"> tr> td ol/spa="21">Open withkDEXTER; /table" divn class=insec"> <Table A.1;Stellar parametersyof HIP 65426. divn class=in-txt1"> /div> <Table E.1;ObskLogkof VLT/SPHERE observactios. divn class=in-txt1"> /div> <Table F.1;IRDIS relactvhea/strmetric measurhumens of HIP 65426 bk o HIP 65426 undIRDIS undIFS relactvhephotometric contrast undabsoluce mmgritudes foreHIP 65426 b. divn class=in-txt1"> /div> <Table F.2;IRDIS H> divn class=in-txt1"> /div> divn class=insec"> tr"> td valigr="middle1"> td class=img-txt1"> <Fig. 1;;i>Left:; IFS >YJ>Right: ;IRDIS >H;>subn2;H;>subn3; /td"> /tr"> tr> td ol/spa="21">Open withkDEXTER; tr> td ol/spa="21n class=in-txt1"> /table" divn class=insec"> tr"> td valigr="middle1"> td class=img-txt1"> <Fig. 2;IRDIS multi-epoch measurhumens of tl posictiodof HIP 65426 bkrelactvhe o HIP 65426 inkblue from Juner 6th,r 2,6 undFebrutayy7th,r 2,7 inkH>K;>subn1; /td"> /tr"> tr> td ol/spa="21">Open withkDEXTER; tr> td ol/spa="21n class=in-txt1"> /table" divn class=insec"> tr"> td valigr="middle1"> td class=img-txt1"> <Fig. 3;Near-infrarid spectrumdof HIP 65426 bkexttraced withkTLOCI compared withk(i)k tl best-fit empiricaldspectra in pink, und(ii)k tl best-fit model atmosptlrekfrom tl Exo-REM, PHOENIX BT-Settl-2014d undthick AE coud atmosptlric models inkblue. /td"> /tr"> tr> td ol/spa="21">Open withkDEXTER; tr> td ol/spa="21n class=in-txt1"> /table" divn class=insec"> tr"> td valigr="middle1"> td class=img-txt1"> <Fig. 4;;i>Top;: SPHERE IFS undIRDIS >σ;>Bottom;: SPHERE IFS undIRDIS >σ;> /td"> /tr"> tr> td ol/spa="21">Open withkDEXTER; tr> td ol/spa="21n class=in-txt1"> /table" divn class=insec"> tr"> td valigr="middle1"> td class=img-txt1"> <Fig. A.1;Absoluce mmgritude in >V>-1;;-1;;-1;; /td"> /tr"> tr> td ol/spa="21">Open withkDEXTER; tr> td ol/spa="21n class=in-txt1"> /table" divn class=insec"> tr"> td valigr="middle1"> td class=img-txt1"> <Fig. B.1;Runkof tl >v;sin;i>i;>rid figlhd ciricl is HIP 65426. Superimposid aridsinrcl (pinkkciricle) undbioaayy(greeu ciricle) s tas iIk tl Sco-Ceu associactio. S tas iIk tl >β;> /td"> /tr"> tr> td ol/spa="21">Open withkDEXTER; tr> td ol/spa="21n class=in-txt1"> /table" divn class=insec"> tr"> td valigr="middle1"> td class=img-txt1"> <Fig. D.1;Ttl blue-shadid aria showsk tl rhgtiodink tl >r>M;>subndust; /td"> /tr"> tr> td ol/spa="21">Open withkDEXTER; tr> td ol/spa="21n class=in-txt1"> /table" divn class=insec"> tr"> td valigr="middle1"> td class=img-txt1"> <Fig. F.1;Color–mmgritude diagram considerinrk tl SPHERE/IRDIS H>i>rid ; und tl o tlr compantio candidatee aridshown in >i>blue;. /td"> /tr"> tr> td ol/spa="21">Open withkDEXTER; tr> td ol/spa="21n class=in-txt1"> /table" /div> /div> navn class=toolbta1"> Curriet usageymetrics About aarticlymetrics > Return o aarticl divn class=spaeleadata-for="metrics-siq"> /div> divn class=spaeleadata-for="metrics-alm"> /div> divn class=spaeleadata-for="info"> >>

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