J/AJ/162/290ivo://CDS.VizieR/J/AJ/162/290doi:10.26093/cds/vizier.51620290CDSRuffio J.-B.Konopacky Q.M.Barman T.Macintosh B.Hoch K.K.W.,De Rosa R.J.Wang J.J.Czekala I.Marois C.2022-06-13T13:41:50Z2022-03-23T12:40:47ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frexoplanetsf-starsinfrared-astronomyspectroscopyThe four directly imaged planets orbiting the star HR8799 are an ideal laboratory to probe atmospheric physics and formation models. We present more than a decade's worth of Keck/OSIRIS observations of these planets, which represent the most detailed look at their atmospheres to date by its resolution and signal-to-noise ratio. We present the first direct detection of HR8799d, the second-closest known planet to the star, at moderate spectral resolution with Keck/OSIRIS (K-band; R~4000). Additionally, we uniformly analyze new and archival OSIRIS data (H and K band) of HR8799b, c, and d. First, we show detections of water (H2O) and carbon monoxide (CO) in the three planets and discuss the ambiguous case of methane (CH4) in the atmosphere of HR8799b. Then, we report radial-velocity (RV) measurements for each of the three planets. The RV measurement of HR8799 d is consistent with predictions made assuming coplanarity and orbital stability of the HR8799 planetary system. Finally, we perform a uniform atmospheric analysis on the OSIRIS data, published photometric points, and low-resolution spectra. We do not infer any significant deviation from the stellar value of the carbon-to-oxygen ratio (C/O) of the three planets, which therefore does not yet yield definitive information about the location or method of formation. However, constraining the C/O for all the HR8799 planets is a milestone for any multiplanet system, and particularly important for large, widely separated gas giants with uncertain formation processes.2021AJ....162..290Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/162/290CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/ApJ/761/57 : CHARA array angular diameters of HR 8799 (Baines+, 2012)J/ApJ/762/88 : Young stellar kinematic group candidate members (Malo+, 2013)J/A+A/566/A130 : Rotation & variability substellar objects (Crossfield, 2014)J/MNRAS/440/1649 : ExoMol line lists for CH4 (Yurchenko+, 2014)J/MNRAS/454/593 : Young moving groups in solar neighbourhood (Bell+, 2015)J/A+A/587/A57 : HR 8799e and HR 8799d spectra (Zurlo+, 2016)J/AJ/155/226 : Gemini Planet Imager spectra of HR8799c/d/e (Greenbaum+, 2018)J/AJ/158/13 : The first 300 stars observed by the GPIES (Nielsen+, 2019)J/AJ/159/63 : New AO exoplanets & brown dwarf companions (Bowler+, 2020)J/A+A/633/A110 : K band spectrum of beta Pictoris b (GRAVITY+, 2020)J/AJ/160/207 : OSIRIS K-band spectroscopy {kappa}Andromedaeb (Wilcomb+, 2020)J/ApJ/891/171 : COCONUTS. I. Spectra of WD & T4 comoving syst. (Zhang+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/162/290https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/162/290http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/162/290https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/162/290https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/162/290http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/162/290GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/AJ/162/290/fig11Extracted spectra of HR 8799b, c, and drecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWaveb[1.47/2.39] Planet b wavelengthumem.wldoubleFluxb[-0.1/0.09]? Planet b flux; continuum subtractedphot.mag;em.IR.Kfloatnullablee_Fluxb[0.003/0.07]? Uncertainty in Fluxbstat.errorfloatnullableTransb[0.29/1.36]? Planet b atmosphere transmissionphys.transmission;obs.atmosfloatnullableWavec[1.47/2.39] Planet c wavelengthumem.wldoubleFluxc[-0.15/0.13]? Planet c flux; continuum subtractedphot.mag;em.IR.Kfloatnullablee_Fluxc[0.005/0.06]? Uncertainty in Fluxcstat.errorfloatnullableTransc[0.25/1.51]? Planet c atmosphere transmissionphys.transmission;obs.atmosfloatnullableWaved[1.95/2.39]? Planet d wavelengthumem.wldoublenullableFluxd[-0.4/0.29]? Planet d flux; continuum subtractedphot.mag;em.IR.Kfloatnullablee_Fluxd[0.02/0.3]? Uncertainty in Fluxdstat.errorfloatnullableTransd[0.28/1.31]? Planet d atmosphere transmissionphys.transmission;obs.atmosfloatnullable